forked from luck/tmp_suning_uos_patched
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"The main changes in this cycle were:
- Continued user-access cleanups in the futex code.
- percpu-rwsem rewrite that uses its own waitqueue and atomic_t
instead of an embedded rwsem. This addresses a couple of
weaknesses, but the primary motivation was complications on the -rt
kernel.
- Introduce raw lock nesting detection on lockdep
(CONFIG_PROVE_RAW_LOCK_NESTING=y), document the raw_lock vs. normal
lock differences. This too originates from -rt.
- Reuse lockdep zapped chain_hlocks entries, to conserve RAM
footprint on distro-ish kernels running into the "BUG:
MAX_LOCKDEP_CHAIN_HLOCKS too low!" depletion of the lockdep
chain-entries pool.
- Misc cleanups, smaller fixes and enhancements - see the changelog
for details"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (55 commits)
fs/buffer: Make BH_Uptodate_Lock bit_spin_lock a regular spinlock_t
thermal/x86_pkg_temp: Make pkg_temp_lock a raw_spinlock_t
Documentation/locking/locktypes: Minor copy editor fixes
Documentation/locking/locktypes: Further clarifications and wordsmithing
m68knommu: Remove mm.h include from uaccess_no.h
x86: get rid of user_atomic_cmpxchg_inatomic()
generic arch_futex_atomic_op_inuser() doesn't need access_ok()
x86: don't reload after cmpxchg in unsafe_atomic_op2() loop
x86: convert arch_futex_atomic_op_inuser() to user_access_begin/user_access_end()
objtool: whitelist __sanitizer_cov_trace_switch()
[parisc, s390, sparc64] no need for access_ok() in futex handling
sh: no need of access_ok() in arch_futex_atomic_op_inuser()
futex: arch_futex_atomic_op_inuser() calling conventions change
completion: Use lockdep_assert_RT_in_threaded_ctx() in complete_all()
lockdep: Add posixtimer context tracing bits
lockdep: Annotate irq_work
lockdep: Add hrtimer context tracing bits
lockdep: Introduce wait-type checks
completion: Use simple wait queues
sched/swait: Prepare usage in completions
...
This commit is contained in:
Linus Torvalds
commit
4b9fd8a829
|
|
@ -7,6 +7,7 @@ locking
|
|||
.. toctree::
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:maxdepth: 1
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||||
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||||
locktypes
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lockdep-design
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lockstat
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locktorture
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||||
|
|
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347
Documentation/locking/locktypes.rst
Normal file
347
Documentation/locking/locktypes.rst
Normal file
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|
@ -0,0 +1,347 @@
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.. SPDX-License-Identifier: GPL-2.0
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.. _kernel_hacking_locktypes:
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==========================
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Lock types and their rules
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==========================
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Introduction
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============
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The kernel provides a variety of locking primitives which can be divided
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into two categories:
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- Sleeping locks
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- Spinning locks
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This document conceptually describes these lock types and provides rules
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for their nesting, including the rules for use under PREEMPT_RT.
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Lock categories
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===============
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Sleeping locks
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--------------
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Sleeping locks can only be acquired in preemptible task context.
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Although implementations allow try_lock() from other contexts, it is
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necessary to carefully evaluate the safety of unlock() as well as of
|
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try_lock(). Furthermore, it is also necessary to evaluate the debugging
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versions of these primitives. In short, don't acquire sleeping locks from
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other contexts unless there is no other option.
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Sleeping lock types:
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- mutex
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- rt_mutex
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- semaphore
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- rw_semaphore
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- ww_mutex
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||||
- percpu_rw_semaphore
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||||
|
||||
On PREEMPT_RT kernels, these lock types are converted to sleeping locks:
|
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- spinlock_t
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- rwlock_t
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|
||||
Spinning locks
|
||||
--------------
|
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|
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- raw_spinlock_t
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- bit spinlocks
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|
||||
On non-PREEMPT_RT kernels, these lock types are also spinning locks:
|
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|
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- spinlock_t
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- rwlock_t
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|
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Spinning locks implicitly disable preemption and the lock / unlock functions
|
||||
can have suffixes which apply further protections:
|
||||
|
||||
=================== ====================================================
|
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_bh() Disable / enable bottom halves (soft interrupts)
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_irq() Disable / enable interrupts
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_irqsave/restore() Save and disable / restore interrupt disabled state
|
||||
=================== ====================================================
|
||||
|
||||
Owner semantics
|
||||
===============
|
||||
|
||||
The aforementioned lock types except semaphores have strict owner
|
||||
semantics:
|
||||
|
||||
The context (task) that acquired the lock must release it.
|
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|
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rw_semaphores have a special interface which allows non-owner release for
|
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readers.
|
||||
|
||||
|
||||
rtmutex
|
||||
=======
|
||||
|
||||
RT-mutexes are mutexes with support for priority inheritance (PI).
|
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|
||||
PI has limitations on non-PREEMPT_RT kernels due to preemption and
|
||||
interrupt disabled sections.
|
||||
|
||||
PI clearly cannot preempt preemption-disabled or interrupt-disabled
|
||||
regions of code, even on PREEMPT_RT kernels. Instead, PREEMPT_RT kernels
|
||||
execute most such regions of code in preemptible task context, especially
|
||||
interrupt handlers and soft interrupts. This conversion allows spinlock_t
|
||||
and rwlock_t to be implemented via RT-mutexes.
|
||||
|
||||
|
||||
semaphore
|
||||
=========
|
||||
|
||||
semaphore is a counting semaphore implementation.
|
||||
|
||||
Semaphores are often used for both serialization and waiting, but new use
|
||||
cases should instead use separate serialization and wait mechanisms, such
|
||||
as mutexes and completions.
|
||||
|
||||
semaphores and PREEMPT_RT
|
||||
----------------------------
|
||||
|
||||
PREEMPT_RT does not change the semaphore implementation because counting
|
||||
semaphores have no concept of owners, thus preventing PREEMPT_RT from
|
||||
providing priority inheritance for semaphores. After all, an unknown
|
||||
owner cannot be boosted. As a consequence, blocking on semaphores can
|
||||
result in priority inversion.
|
||||
|
||||
|
||||
rw_semaphore
|
||||
============
|
||||
|
||||
rw_semaphore is a multiple readers and single writer lock mechanism.
|
||||
|
||||
On non-PREEMPT_RT kernels the implementation is fair, thus preventing
|
||||
writer starvation.
|
||||
|
||||
rw_semaphore complies by default with the strict owner semantics, but there
|
||||
exist special-purpose interfaces that allow non-owner release for readers.
|
||||
These interfaces work independent of the kernel configuration.
|
||||
|
||||
rw_semaphore and PREEMPT_RT
|
||||
---------------------------
|
||||
|
||||
PREEMPT_RT kernels map rw_semaphore to a separate rt_mutex-based
|
||||
implementation, thus changing the fairness:
|
||||
|
||||
Because an rw_semaphore writer cannot grant its priority to multiple
|
||||
readers, a preempted low-priority reader will continue holding its lock,
|
||||
thus starving even high-priority writers. In contrast, because readers
|
||||
can grant their priority to a writer, a preempted low-priority writer will
|
||||
have its priority boosted until it releases the lock, thus preventing that
|
||||
writer from starving readers.
|
||||
|
||||
|
||||
raw_spinlock_t and spinlock_t
|
||||
=============================
|
||||
|
||||
raw_spinlock_t
|
||||
--------------
|
||||
|
||||
raw_spinlock_t is a strict spinning lock implementation regardless of the
|
||||
kernel configuration including PREEMPT_RT enabled kernels.
|
||||
|
||||
raw_spinlock_t is a strict spinning lock implementation in all kernels,
|
||||
including PREEMPT_RT kernels. Use raw_spinlock_t only in real critical
|
||||
core code, low-level interrupt handling and places where disabling
|
||||
preemption or interrupts is required, for example, to safely access
|
||||
hardware state. raw_spinlock_t can sometimes also be used when the
|
||||
critical section is tiny, thus avoiding RT-mutex overhead.
|
||||
|
||||
spinlock_t
|
||||
----------
|
||||
|
||||
The semantics of spinlock_t change with the state of PREEMPT_RT.
|
||||
|
||||
On a non-PREEMPT_RT kernel spinlock_t is mapped to raw_spinlock_t and has
|
||||
exactly the same semantics.
|
||||
|
||||
spinlock_t and PREEMPT_RT
|
||||
-------------------------
|
||||
|
||||
On a PREEMPT_RT kernel spinlock_t is mapped to a separate implementation
|
||||
based on rt_mutex which changes the semantics:
|
||||
|
||||
- Preemption is not disabled.
|
||||
|
||||
- The hard interrupt related suffixes for spin_lock / spin_unlock
|
||||
operations (_irq, _irqsave / _irqrestore) do not affect the CPU's
|
||||
interrupt disabled state.
|
||||
|
||||
- The soft interrupt related suffix (_bh()) still disables softirq
|
||||
handlers.
|
||||
|
||||
Non-PREEMPT_RT kernels disable preemption to get this effect.
|
||||
|
||||
PREEMPT_RT kernels use a per-CPU lock for serialization which keeps
|
||||
preemption disabled. The lock disables softirq handlers and also
|
||||
prevents reentrancy due to task preemption.
|
||||
|
||||
PREEMPT_RT kernels preserve all other spinlock_t semantics:
|
||||
|
||||
- Tasks holding a spinlock_t do not migrate. Non-PREEMPT_RT kernels
|
||||
avoid migration by disabling preemption. PREEMPT_RT kernels instead
|
||||
disable migration, which ensures that pointers to per-CPU variables
|
||||
remain valid even if the task is preempted.
|
||||
|
||||
- Task state is preserved across spinlock acquisition, ensuring that the
|
||||
task-state rules apply to all kernel configurations. Non-PREEMPT_RT
|
||||
kernels leave task state untouched. However, PREEMPT_RT must change
|
||||
task state if the task blocks during acquisition. Therefore, it saves
|
||||
the current task state before blocking and the corresponding lock wakeup
|
||||
restores it, as shown below::
|
||||
|
||||
task->state = TASK_INTERRUPTIBLE
|
||||
lock()
|
||||
block()
|
||||
task->saved_state = task->state
|
||||
task->state = TASK_UNINTERRUPTIBLE
|
||||
schedule()
|
||||
lock wakeup
|
||||
task->state = task->saved_state
|
||||
|
||||
Other types of wakeups would normally unconditionally set the task state
|
||||
to RUNNING, but that does not work here because the task must remain
|
||||
blocked until the lock becomes available. Therefore, when a non-lock
|
||||
wakeup attempts to awaken a task blocked waiting for a spinlock, it
|
||||
instead sets the saved state to RUNNING. Then, when the lock
|
||||
acquisition completes, the lock wakeup sets the task state to the saved
|
||||
state, in this case setting it to RUNNING::
|
||||
|
||||
task->state = TASK_INTERRUPTIBLE
|
||||
lock()
|
||||
block()
|
||||
task->saved_state = task->state
|
||||
task->state = TASK_UNINTERRUPTIBLE
|
||||
schedule()
|
||||
non lock wakeup
|
||||
task->saved_state = TASK_RUNNING
|
||||
|
||||
lock wakeup
|
||||
task->state = task->saved_state
|
||||
|
||||
This ensures that the real wakeup cannot be lost.
|
||||
|
||||
|
||||
rwlock_t
|
||||
========
|
||||
|
||||
rwlock_t is a multiple readers and single writer lock mechanism.
|
||||
|
||||
Non-PREEMPT_RT kernels implement rwlock_t as a spinning lock and the
|
||||
suffix rules of spinlock_t apply accordingly. The implementation is fair,
|
||||
thus preventing writer starvation.
|
||||
|
||||
rwlock_t and PREEMPT_RT
|
||||
-----------------------
|
||||
|
||||
PREEMPT_RT kernels map rwlock_t to a separate rt_mutex-based
|
||||
implementation, thus changing semantics:
|
||||
|
||||
- All the spinlock_t changes also apply to rwlock_t.
|
||||
|
||||
- Because an rwlock_t writer cannot grant its priority to multiple
|
||||
readers, a preempted low-priority reader will continue holding its lock,
|
||||
thus starving even high-priority writers. In contrast, because readers
|
||||
can grant their priority to a writer, a preempted low-priority writer
|
||||
will have its priority boosted until it releases the lock, thus
|
||||
preventing that writer from starving readers.
|
||||
|
||||
|
||||
PREEMPT_RT caveats
|
||||
==================
|
||||
|
||||
spinlock_t and rwlock_t
|
||||
-----------------------
|
||||
|
||||
These changes in spinlock_t and rwlock_t semantics on PREEMPT_RT kernels
|
||||
have a few implications. For example, on a non-PREEMPT_RT kernel the
|
||||
following code sequence works as expected::
|
||||
|
||||
local_irq_disable();
|
||||
spin_lock(&lock);
|
||||
|
||||
and is fully equivalent to::
|
||||
|
||||
spin_lock_irq(&lock);
|
||||
|
||||
Same applies to rwlock_t and the _irqsave() suffix variants.
|
||||
|
||||
On PREEMPT_RT kernel this code sequence breaks because RT-mutex requires a
|
||||
fully preemptible context. Instead, use spin_lock_irq() or
|
||||
spin_lock_irqsave() and their unlock counterparts. In cases where the
|
||||
interrupt disabling and locking must remain separate, PREEMPT_RT offers a
|
||||
local_lock mechanism. Acquiring the local_lock pins the task to a CPU,
|
||||
allowing things like per-CPU interrupt disabled locks to be acquired.
|
||||
However, this approach should be used only where absolutely necessary.
|
||||
|
||||
|
||||
raw_spinlock_t
|
||||
--------------
|
||||
|
||||
Acquiring a raw_spinlock_t disables preemption and possibly also
|
||||
interrupts, so the critical section must avoid acquiring a regular
|
||||
spinlock_t or rwlock_t, for example, the critical section must avoid
|
||||
allocating memory. Thus, on a non-PREEMPT_RT kernel the following code
|
||||
works perfectly::
|
||||
|
||||
raw_spin_lock(&lock);
|
||||
p = kmalloc(sizeof(*p), GFP_ATOMIC);
|
||||
|
||||
But this code fails on PREEMPT_RT kernels because the memory allocator is
|
||||
fully preemptible and therefore cannot be invoked from truly atomic
|
||||
contexts. However, it is perfectly fine to invoke the memory allocator
|
||||
while holding normal non-raw spinlocks because they do not disable
|
||||
preemption on PREEMPT_RT kernels::
|
||||
|
||||
spin_lock(&lock);
|
||||
p = kmalloc(sizeof(*p), GFP_ATOMIC);
|
||||
|
||||
|
||||
bit spinlocks
|
||||
-------------
|
||||
|
||||
PREEMPT_RT cannot substitute bit spinlocks because a single bit is too
|
||||
small to accommodate an RT-mutex. Therefore, the semantics of bit
|
||||
spinlocks are preserved on PREEMPT_RT kernels, so that the raw_spinlock_t
|
||||
caveats also apply to bit spinlocks.
|
||||
|
||||
Some bit spinlocks are replaced with regular spinlock_t for PREEMPT_RT
|
||||
using conditional (#ifdef'ed) code changes at the usage site. In contrast,
|
||||
usage-site changes are not needed for the spinlock_t substitution.
|
||||
Instead, conditionals in header files and the core locking implemementation
|
||||
enable the compiler to do the substitution transparently.
|
||||
|
||||
|
||||
Lock type nesting rules
|
||||
=======================
|
||||
|
||||
The most basic rules are:
|
||||
|
||||
- Lock types of the same lock category (sleeping, spinning) can nest
|
||||
arbitrarily as long as they respect the general lock ordering rules to
|
||||
prevent deadlocks.
|
||||
|
||||
- Sleeping lock types cannot nest inside spinning lock types.
|
||||
|
||||
- Spinning lock types can nest inside sleeping lock types.
|
||||
|
||||
These constraints apply both in PREEMPT_RT and otherwise.
|
||||
|
||||
The fact that PREEMPT_RT changes the lock category of spinlock_t and
|
||||
rwlock_t from spinning to sleeping means that they cannot be acquired while
|
||||
holding a raw spinlock. This results in the following nesting ordering:
|
||||
|
||||
1) Sleeping locks
|
||||
2) spinlock_t and rwlock_t
|
||||
3) raw_spinlock_t and bit spinlocks
|
||||
|
||||
Lockdep will complain if these constraints are violated, both in
|
||||
PREEMPT_RT and otherwise.
|
||||
|
|
@ -31,7 +31,8 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -53,8 +54,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -75,10 +75,12 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
#ifndef CONFIG_ARC_HAS_LLSC
|
||||
preempt_disable(); /* to guarantee atomic r-m-w of futex op */
|
||||
#endif
|
||||
pagefault_disable();
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -101,7 +103,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
#ifndef CONFIG_ARC_HAS_LLSC
|
||||
preempt_enable();
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -134,10 +134,12 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret, tmp;
|
||||
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
preempt_disable();
|
||||
#endif
|
||||
pagefault_disable();
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -159,7 +161,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
#ifndef CONFIG_SMP
|
||||
preempt_enable();
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -48,7 +48,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *_uaddr)
|
|||
int oldval = 0, ret, tmp;
|
||||
u32 __user *uaddr = __uaccess_mask_ptr(_uaddr);
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(_uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -75,8 +76,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *_uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -11,7 +11,6 @@
|
|||
#include <linux/errno.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/version.h>
|
||||
#include <asm/segment.h>
|
||||
|
|
|
|||
|
|
@ -36,7 +36,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -62,8 +63,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -10,7 +10,6 @@
|
|||
/*
|
||||
* User space memory access functions
|
||||
*/
|
||||
#include <linux/mm.h>
|
||||
#include <asm/sections.h>
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -50,7 +50,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -74,8 +75,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -35,7 +35,6 @@
|
|||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/page-flags.h>
|
||||
#include <linux/mm.h>
|
||||
|
||||
#include <asm/intrinsics.h>
|
||||
#include <asm/pgtable.h>
|
||||
|
|
|
|||
|
|
@ -681,3 +681,4 @@ machine_power_off (void)
|
|||
machine_halt();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(ia64_delay_loop);
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/efi.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/meminit.h>
|
||||
|
|
|
|||
|
|
@ -5,7 +5,6 @@
|
|||
/*
|
||||
* User space memory access functions
|
||||
*/
|
||||
#include <linux/mm.h>
|
||||
#include <linux/string.h>
|
||||
|
||||
#include <asm/segment.h>
|
||||
|
|
|
|||
|
|
@ -34,7 +34,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -56,8 +57,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -12,7 +12,6 @@
|
|||
#define _ASM_MICROBLAZE_UACCESS_H
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
|
||||
#include <asm/mmu.h>
|
||||
#include <asm/page.h>
|
||||
|
|
|
|||
|
|
@ -89,7 +89,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -116,8 +117,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -66,8 +66,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
__futex_atomic_op("move %0, %3", ret, oldval, tmp, uaddr,
|
||||
|
|
@ -93,8 +93,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -11,7 +11,6 @@
|
|||
#include <asm/errno.h>
|
||||
#include <asm/memory.h>
|
||||
#include <asm/types.h>
|
||||
#include <linux/mm.h>
|
||||
|
||||
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
|
||||
|
||||
|
|
|
|||
|
|
@ -35,7 +35,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -57,8 +58,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -40,7 +40,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
u32 tmp;
|
||||
|
||||
_futex_spin_lock_irqsave(uaddr, &flags);
|
||||
pagefault_disable();
|
||||
|
||||
ret = -EFAULT;
|
||||
if (unlikely(get_user(oldval, uaddr) != 0))
|
||||
|
|
@ -73,7 +72,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -EFAULT;
|
||||
|
||||
out_pagefault_enable:
|
||||
pagefault_enable();
|
||||
_futex_spin_unlock_irqrestore(uaddr, &flags);
|
||||
|
||||
if (!ret)
|
||||
|
|
|
|||
|
|
@ -35,8 +35,9 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
{
|
||||
int oldval = 0, ret;
|
||||
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
allow_read_write_user(uaddr, uaddr, sizeof(*uaddr));
|
||||
pagefault_disable();
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -58,8 +59,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
*oval = oldval;
|
||||
|
||||
prevent_read_write_user(uaddr, uaddr, sizeof(*uaddr));
|
||||
|
|
|
|||
|
|
@ -13,6 +13,7 @@
|
|||
#include <linux/init.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/rcuwait.h>
|
||||
|
||||
#include <asm/firmware.h>
|
||||
#include <asm/lv1call.h>
|
||||
|
|
@ -670,7 +671,8 @@ struct ps3_notification_device {
|
|||
spinlock_t lock;
|
||||
u64 tag;
|
||||
u64 lv1_status;
|
||||
struct completion done;
|
||||
struct rcuwait wait;
|
||||
bool done;
|
||||
};
|
||||
|
||||
enum ps3_notify_type {
|
||||
|
|
@ -712,7 +714,8 @@ static irqreturn_t ps3_notification_interrupt(int irq, void *data)
|
|||
pr_debug("%s:%u: completed, status 0x%llx\n", __func__,
|
||||
__LINE__, status);
|
||||
dev->lv1_status = status;
|
||||
complete(&dev->done);
|
||||
dev->done = true;
|
||||
rcuwait_wake_up(&dev->wait);
|
||||
}
|
||||
spin_unlock(&dev->lock);
|
||||
return IRQ_HANDLED;
|
||||
|
|
@ -725,12 +728,12 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev,
|
|||
unsigned long flags;
|
||||
int res;
|
||||
|
||||
init_completion(&dev->done);
|
||||
spin_lock_irqsave(&dev->lock, flags);
|
||||
res = write ? lv1_storage_write(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
|
||||
&dev->tag)
|
||||
: lv1_storage_read(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
|
||||
&dev->tag);
|
||||
dev->done = false;
|
||||
spin_unlock_irqrestore(&dev->lock, flags);
|
||||
if (res) {
|
||||
pr_err("%s:%u: %s failed %d\n", __func__, __LINE__, op, res);
|
||||
|
|
@ -738,14 +741,10 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev,
|
|||
}
|
||||
pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);
|
||||
|
||||
res = wait_event_interruptible(dev->done.wait,
|
||||
dev->done.done || kthread_should_stop());
|
||||
rcuwait_wait_event(&dev->wait, dev->done || kthread_should_stop(), TASK_IDLE);
|
||||
|
||||
if (kthread_should_stop())
|
||||
res = -EINTR;
|
||||
if (res) {
|
||||
pr_debug("%s:%u: interrupted %s\n", __func__, __LINE__, op);
|
||||
return res;
|
||||
}
|
||||
|
||||
if (dev->lv1_status) {
|
||||
pr_err("%s:%u: %s not completed, status 0x%llx\n", __func__,
|
||||
|
|
@ -810,6 +809,7 @@ static int ps3_probe_thread(void *data)
|
|||
}
|
||||
|
||||
spin_lock_init(&dev.lock);
|
||||
rcuwait_init(&dev.wait);
|
||||
|
||||
res = request_irq(irq, ps3_notification_interrupt, 0,
|
||||
"ps3_notification", &dev);
|
||||
|
|
|
|||
|
|
@ -46,7 +46,8 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
{
|
||||
int oldval = 0, ret = 0;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -73,8 +74,6 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -29,7 +29,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
mm_segment_t old_fs;
|
||||
|
||||
old_fs = enable_sacf_uaccess();
|
||||
pagefault_disable();
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
__futex_atomic_op("lr %2,%5\n",
|
||||
|
|
@ -54,7 +53,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
default:
|
||||
ret = -ENOSYS;
|
||||
}
|
||||
pagefault_enable();
|
||||
disable_sacf_uaccess(old_fs);
|
||||
|
||||
if (!ret)
|
||||
|
|
|
|||
|
|
@ -34,8 +34,6 @@ static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
|
|||
u32 oldval, newval, prev;
|
||||
int ret;
|
||||
|
||||
pagefault_disable();
|
||||
|
||||
do {
|
||||
ret = get_user(oldval, uaddr);
|
||||
|
||||
|
|
@ -67,8 +65,6 @@ static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
|
|||
ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
|
||||
} while (!ret && prev != oldval);
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -38,8 +38,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
if (unlikely((((unsigned long) uaddr) & 0x3UL)))
|
||||
return -EINVAL;
|
||||
|
||||
pagefault_disable();
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
__futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
|
||||
|
|
@ -60,8 +58,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -12,76 +12,103 @@
|
|||
#include <asm/processor.h>
|
||||
#include <asm/smap.h>
|
||||
|
||||
#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
|
||||
asm volatile("\t" ASM_STAC "\n" \
|
||||
"1:\t" insn "\n" \
|
||||
"2:\t" ASM_CLAC "\n" \
|
||||
#define unsafe_atomic_op1(insn, oval, uaddr, oparg, label) \
|
||||
do { \
|
||||
int oldval = 0, ret; \
|
||||
asm volatile("1:\t" insn "\n" \
|
||||
"2:\n" \
|
||||
"\t.section .fixup,\"ax\"\n" \
|
||||
"3:\tmov\t%3, %1\n" \
|
||||
"\tjmp\t2b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 3b) \
|
||||
: "=r" (oldval), "=r" (ret), "+m" (*uaddr) \
|
||||
: "i" (-EFAULT), "0" (oparg), "1" (0))
|
||||
: "i" (-EFAULT), "0" (oparg), "1" (0)); \
|
||||
if (ret) \
|
||||
goto label; \
|
||||
*oval = oldval; \
|
||||
} while(0)
|
||||
|
||||
#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
|
||||
asm volatile("\t" ASM_STAC "\n" \
|
||||
"1:\tmovl %2, %0\n" \
|
||||
"\tmovl\t%0, %3\n" \
|
||||
|
||||
#define unsafe_atomic_op2(insn, oval, uaddr, oparg, label) \
|
||||
do { \
|
||||
int oldval = 0, ret, tem; \
|
||||
asm volatile("1:\tmovl %2, %0\n" \
|
||||
"2:\tmovl\t%0, %3\n" \
|
||||
"\t" insn "\n" \
|
||||
"2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \
|
||||
"\tjnz\t1b\n" \
|
||||
"3:\t" ASM_CLAC "\n" \
|
||||
"3:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \
|
||||
"\tjnz\t2b\n" \
|
||||
"4:\n" \
|
||||
"\t.section .fixup,\"ax\"\n" \
|
||||
"4:\tmov\t%5, %1\n" \
|
||||
"\tjmp\t3b\n" \
|
||||
"5:\tmov\t%5, %1\n" \
|
||||
"\tjmp\t4b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 4b) \
|
||||
_ASM_EXTABLE_UA(2b, 4b) \
|
||||
_ASM_EXTABLE_UA(1b, 5b) \
|
||||
_ASM_EXTABLE_UA(3b, 5b) \
|
||||
: "=&a" (oldval), "=&r" (ret), \
|
||||
"+m" (*uaddr), "=&r" (tem) \
|
||||
: "r" (oparg), "i" (-EFAULT), "1" (0))
|
||||
: "r" (oparg), "i" (-EFAULT), "1" (0)); \
|
||||
if (ret) \
|
||||
goto label; \
|
||||
*oval = oldval; \
|
||||
} while(0)
|
||||
|
||||
static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
||||
static __always_inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
||||
u32 __user *uaddr)
|
||||
{
|
||||
int oldval = 0, ret, tem;
|
||||
|
||||
pagefault_disable();
|
||||
if (!user_access_begin(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
|
||||
unsafe_atomic_op1("xchgl %0, %2", oval, uaddr, oparg, Efault);
|
||||
break;
|
||||
case FUTEX_OP_ADD:
|
||||
__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
|
||||
uaddr, oparg);
|
||||
unsafe_atomic_op1(LOCK_PREFIX "xaddl %0, %2", oval,
|
||||
uaddr, oparg, Efault);
|
||||
break;
|
||||
case FUTEX_OP_OR:
|
||||
__futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg);
|
||||
unsafe_atomic_op2("orl %4, %3", oval, uaddr, oparg, Efault);
|
||||
break;
|
||||
case FUTEX_OP_ANDN:
|
||||
__futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg);
|
||||
unsafe_atomic_op2("andl %4, %3", oval, uaddr, ~oparg, Efault);
|
||||
break;
|
||||
case FUTEX_OP_XOR:
|
||||
__futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg);
|
||||
unsafe_atomic_op2("xorl %4, %3", oval, uaddr, oparg, Efault);
|
||||
break;
|
||||
default:
|
||||
ret = -ENOSYS;
|
||||
user_access_end();
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
return ret;
|
||||
user_access_end();
|
||||
return 0;
|
||||
Efault:
|
||||
user_access_end();
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
||||
u32 oldval, u32 newval)
|
||||
{
|
||||
return user_atomic_cmpxchg_inatomic(uval, uaddr, oldval, newval);
|
||||
int ret = 0;
|
||||
|
||||
if (!user_access_begin(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
asm volatile("\n"
|
||||
"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
|
||||
"2:\n"
|
||||
"\t.section .fixup, \"ax\"\n"
|
||||
"3:\tmov %3, %0\n"
|
||||
"\tjmp 2b\n"
|
||||
"\t.previous\n"
|
||||
_ASM_EXTABLE_UA(1b, 3b)
|
||||
: "+r" (ret), "=a" (oldval), "+m" (*uaddr)
|
||||
: "i" (-EFAULT), "r" (newval), "1" (oldval)
|
||||
: "memory"
|
||||
);
|
||||
user_access_end();
|
||||
*uval = oldval;
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -584,99 +584,6 @@ extern __must_check long strnlen_user(const char __user *str, long n);
|
|||
unsigned long __must_check clear_user(void __user *mem, unsigned long len);
|
||||
unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
|
||||
|
||||
extern void __cmpxchg_wrong_size(void)
|
||||
__compiletime_error("Bad argument size for cmpxchg");
|
||||
|
||||
#define __user_atomic_cmpxchg_inatomic(uval, ptr, old, new, size) \
|
||||
({ \
|
||||
int __ret = 0; \
|
||||
__typeof__(*(ptr)) __old = (old); \
|
||||
__typeof__(*(ptr)) __new = (new); \
|
||||
__uaccess_begin_nospec(); \
|
||||
switch (size) { \
|
||||
case 1: \
|
||||
{ \
|
||||
asm volatile("\n" \
|
||||
"1:\t" LOCK_PREFIX "cmpxchgb %4, %2\n" \
|
||||
"2:\n" \
|
||||
"\t.section .fixup, \"ax\"\n" \
|
||||
"3:\tmov %3, %0\n" \
|
||||
"\tjmp 2b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 3b) \
|
||||
: "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
|
||||
: "i" (-EFAULT), "q" (__new), "1" (__old) \
|
||||
: "memory" \
|
||||
); \
|
||||
break; \
|
||||
} \
|
||||
case 2: \
|
||||
{ \
|
||||
asm volatile("\n" \
|
||||
"1:\t" LOCK_PREFIX "cmpxchgw %4, %2\n" \
|
||||
"2:\n" \
|
||||
"\t.section .fixup, \"ax\"\n" \
|
||||
"3:\tmov %3, %0\n" \
|
||||
"\tjmp 2b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 3b) \
|
||||
: "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
|
||||
: "i" (-EFAULT), "r" (__new), "1" (__old) \
|
||||
: "memory" \
|
||||
); \
|
||||
break; \
|
||||
} \
|
||||
case 4: \
|
||||
{ \
|
||||
asm volatile("\n" \
|
||||
"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n" \
|
||||
"2:\n" \
|
||||
"\t.section .fixup, \"ax\"\n" \
|
||||
"3:\tmov %3, %0\n" \
|
||||
"\tjmp 2b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 3b) \
|
||||
: "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
|
||||
: "i" (-EFAULT), "r" (__new), "1" (__old) \
|
||||
: "memory" \
|
||||
); \
|
||||
break; \
|
||||
} \
|
||||
case 8: \
|
||||
{ \
|
||||
if (!IS_ENABLED(CONFIG_X86_64)) \
|
||||
__cmpxchg_wrong_size(); \
|
||||
\
|
||||
asm volatile("\n" \
|
||||
"1:\t" LOCK_PREFIX "cmpxchgq %4, %2\n" \
|
||||
"2:\n" \
|
||||
"\t.section .fixup, \"ax\"\n" \
|
||||
"3:\tmov %3, %0\n" \
|
||||
"\tjmp 2b\n" \
|
||||
"\t.previous\n" \
|
||||
_ASM_EXTABLE_UA(1b, 3b) \
|
||||
: "+r" (__ret), "=a" (__old), "+m" (*(ptr)) \
|
||||
: "i" (-EFAULT), "r" (__new), "1" (__old) \
|
||||
: "memory" \
|
||||
); \
|
||||
break; \
|
||||
} \
|
||||
default: \
|
||||
__cmpxchg_wrong_size(); \
|
||||
} \
|
||||
__uaccess_end(); \
|
||||
*(uval) = __old; \
|
||||
__ret; \
|
||||
})
|
||||
|
||||
#define user_atomic_cmpxchg_inatomic(uval, ptr, old, new) \
|
||||
({ \
|
||||
access_ok((ptr), sizeof(*(ptr))) ? \
|
||||
__user_atomic_cmpxchg_inatomic((uval), (ptr), \
|
||||
(old), (new), sizeof(*(ptr))) : \
|
||||
-EFAULT; \
|
||||
})
|
||||
|
||||
/*
|
||||
* movsl can be slow when source and dest are not both 8-byte aligned
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -72,7 +72,8 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
#if XCHAL_HAVE_S32C1I || XCHAL_HAVE_EXCLUSIVE
|
||||
int oldval = 0, ret;
|
||||
|
||||
pagefault_disable();
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
switch (op) {
|
||||
case FUTEX_OP_SET:
|
||||
|
|
@ -99,8 +100,6 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
|
|||
ret = -ENOSYS;
|
||||
}
|
||||
|
||||
pagefault_enable();
|
||||
|
||||
if (!ret)
|
||||
*oval = oldval;
|
||||
|
||||
|
|
|
|||
|
|
@ -365,17 +365,6 @@ static struct request_context *ezusb_alloc_ctx(struct ezusb_priv *upriv,
|
|||
return ctx;
|
||||
}
|
||||
|
||||
|
||||
/* Hopefully the real complete_all will soon be exported, in the mean
|
||||
* while this should work. */
|
||||
static inline void ezusb_complete_all(struct completion *comp)
|
||||
{
|
||||
complete(comp);
|
||||
complete(comp);
|
||||
complete(comp);
|
||||
complete(comp);
|
||||
}
|
||||
|
||||
static void ezusb_ctx_complete(struct request_context *ctx)
|
||||
{
|
||||
struct ezusb_priv *upriv = ctx->upriv;
|
||||
|
|
@ -409,7 +398,7 @@ static void ezusb_ctx_complete(struct request_context *ctx)
|
|||
|
||||
netif_wake_queue(dev);
|
||||
}
|
||||
ezusb_complete_all(&ctx->done);
|
||||
complete_all(&ctx->done);
|
||||
ezusb_request_context_put(ctx);
|
||||
break;
|
||||
|
||||
|
|
@ -419,7 +408,7 @@ static void ezusb_ctx_complete(struct request_context *ctx)
|
|||
/* This is normal, as all request contexts get flushed
|
||||
* when the device is disconnected */
|
||||
err("Called, CTX not terminating, but device gone");
|
||||
ezusb_complete_all(&ctx->done);
|
||||
complete_all(&ctx->done);
|
||||
ezusb_request_context_put(ctx);
|
||||
break;
|
||||
}
|
||||
|
|
@ -690,11 +679,11 @@ static void ezusb_req_ctx_wait(struct ezusb_priv *upriv,
|
|||
* get the chance to run themselves. So we make sure
|
||||
* that we don't sleep for ever */
|
||||
int msecs = DEF_TIMEOUT * (1000 / HZ);
|
||||
while (!ctx->done.done && msecs--)
|
||||
|
||||
while (!try_wait_for_completion(&ctx->done) && msecs--)
|
||||
udelay(1000);
|
||||
} else {
|
||||
wait_event_interruptible(ctx->done.wait,
|
||||
ctx->done.done);
|
||||
wait_for_completion(&ctx->done);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
|
|
|
|||
|
|
@ -52,10 +52,11 @@ struct switchtec_user {
|
|||
|
||||
enum mrpc_state state;
|
||||
|
||||
struct completion comp;
|
||||
wait_queue_head_t cmd_comp;
|
||||
struct kref kref;
|
||||
struct list_head list;
|
||||
|
||||
bool cmd_done;
|
||||
u32 cmd;
|
||||
u32 status;
|
||||
u32 return_code;
|
||||
|
|
@ -77,7 +78,7 @@ static struct switchtec_user *stuser_create(struct switchtec_dev *stdev)
|
|||
stuser->stdev = stdev;
|
||||
kref_init(&stuser->kref);
|
||||
INIT_LIST_HEAD(&stuser->list);
|
||||
init_completion(&stuser->comp);
|
||||
init_waitqueue_head(&stuser->cmd_comp);
|
||||
stuser->event_cnt = atomic_read(&stdev->event_cnt);
|
||||
|
||||
dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
|
||||
|
|
@ -175,7 +176,7 @@ static int mrpc_queue_cmd(struct switchtec_user *stuser)
|
|||
kref_get(&stuser->kref);
|
||||
stuser->read_len = sizeof(stuser->data);
|
||||
stuser_set_state(stuser, MRPC_QUEUED);
|
||||
init_completion(&stuser->comp);
|
||||
stuser->cmd_done = false;
|
||||
list_add_tail(&stuser->list, &stdev->mrpc_queue);
|
||||
|
||||
mrpc_cmd_submit(stdev);
|
||||
|
|
@ -222,7 +223,8 @@ static void mrpc_complete_cmd(struct switchtec_dev *stdev)
|
|||
memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data,
|
||||
stuser->read_len);
|
||||
out:
|
||||
complete_all(&stuser->comp);
|
||||
stuser->cmd_done = true;
|
||||
wake_up_interruptible(&stuser->cmd_comp);
|
||||
list_del_init(&stuser->list);
|
||||
stuser_put(stuser);
|
||||
stdev->mrpc_busy = 0;
|
||||
|
|
@ -529,10 +531,11 @@ static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
|
|||
mutex_unlock(&stdev->mrpc_mutex);
|
||||
|
||||
if (filp->f_flags & O_NONBLOCK) {
|
||||
if (!try_wait_for_completion(&stuser->comp))
|
||||
if (!stuser->cmd_done)
|
||||
return -EAGAIN;
|
||||
} else {
|
||||
rc = wait_for_completion_interruptible(&stuser->comp);
|
||||
rc = wait_event_interruptible(stuser->cmd_comp,
|
||||
stuser->cmd_done);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
}
|
||||
|
|
@ -580,7 +583,7 @@ static __poll_t switchtec_dev_poll(struct file *filp, poll_table *wait)
|
|||
struct switchtec_dev *stdev = stuser->stdev;
|
||||
__poll_t ret = 0;
|
||||
|
||||
poll_wait(filp, &stuser->comp.wait, wait);
|
||||
poll_wait(filp, &stuser->cmd_comp, wait);
|
||||
poll_wait(filp, &stdev->event_wq, wait);
|
||||
|
||||
if (lock_mutex_and_test_alive(stdev))
|
||||
|
|
@ -588,7 +591,7 @@ static __poll_t switchtec_dev_poll(struct file *filp, poll_table *wait)
|
|||
|
||||
mutex_unlock(&stdev->mrpc_mutex);
|
||||
|
||||
if (try_wait_for_completion(&stuser->comp))
|
||||
if (stuser->cmd_done)
|
||||
ret |= EPOLLIN | EPOLLRDNORM;
|
||||
|
||||
if (stuser->event_cnt != atomic_read(&stdev->event_cnt))
|
||||
|
|
@ -1272,7 +1275,8 @@ static void stdev_kill(struct switchtec_dev *stdev)
|
|||
|
||||
/* Wake up and kill any users waiting on an MRPC request */
|
||||
list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) {
|
||||
complete_all(&stuser->comp);
|
||||
stuser->cmd_done = true;
|
||||
wake_up_interruptible(&stuser->cmd_comp);
|
||||
list_del_init(&stuser->list);
|
||||
stuser_put(stuser);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -16,6 +16,7 @@
|
|||
#include <linux/interrupt.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/fs.h>
|
||||
|
||||
struct smo8800_device {
|
||||
u32 irq; /* acpi device irq */
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@
|
|||
#include <linux/uaccess.h>
|
||||
#include <linux/uuid.h>
|
||||
#include <linux/wmi.h>
|
||||
#include <linux/fs.h>
|
||||
#include <uapi/linux/wmi.h>
|
||||
|
||||
ACPI_MODULE_NAME("wmi");
|
||||
|
|
|
|||
|
|
@ -19,6 +19,7 @@
|
|||
#include <linux/acpi.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/fs.h>
|
||||
#include "acpi_thermal_rel.h"
|
||||
|
||||
static acpi_handle acpi_thermal_rel_handle;
|
||||
|
|
|
|||
|
|
@ -63,7 +63,7 @@ static int max_id __read_mostly;
|
|||
/* Array of zone pointers */
|
||||
static struct zone_device **zones;
|
||||
/* Serializes interrupt notification, work and hotplug */
|
||||
static DEFINE_SPINLOCK(pkg_temp_lock);
|
||||
static DEFINE_RAW_SPINLOCK(pkg_temp_lock);
|
||||
/* Protects zone operation in the work function against hotplug removal */
|
||||
static DEFINE_MUTEX(thermal_zone_mutex);
|
||||
|
||||
|
|
@ -266,12 +266,12 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
|
|||
u64 msr_val, wr_val;
|
||||
|
||||
mutex_lock(&thermal_zone_mutex);
|
||||
spin_lock_irq(&pkg_temp_lock);
|
||||
raw_spin_lock_irq(&pkg_temp_lock);
|
||||
++pkg_work_cnt;
|
||||
|
||||
zonedev = pkg_temp_thermal_get_dev(cpu);
|
||||
if (!zonedev) {
|
||||
spin_unlock_irq(&pkg_temp_lock);
|
||||
raw_spin_unlock_irq(&pkg_temp_lock);
|
||||
mutex_unlock(&thermal_zone_mutex);
|
||||
return;
|
||||
}
|
||||
|
|
@ -285,7 +285,7 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
|
|||
}
|
||||
|
||||
enable_pkg_thres_interrupt();
|
||||
spin_unlock_irq(&pkg_temp_lock);
|
||||
raw_spin_unlock_irq(&pkg_temp_lock);
|
||||
|
||||
/*
|
||||
* If tzone is not NULL, then thermal_zone_mutex will prevent the
|
||||
|
|
@ -310,7 +310,7 @@ static int pkg_thermal_notify(u64 msr_val)
|
|||
struct zone_device *zonedev;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&pkg_temp_lock, flags);
|
||||
raw_spin_lock_irqsave(&pkg_temp_lock, flags);
|
||||
++pkg_interrupt_cnt;
|
||||
|
||||
disable_pkg_thres_interrupt();
|
||||
|
|
@ -322,7 +322,7 @@ static int pkg_thermal_notify(u64 msr_val)
|
|||
pkg_thermal_schedule_work(zonedev->cpu, &zonedev->work);
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&pkg_temp_lock, flags);
|
||||
raw_spin_unlock_irqrestore(&pkg_temp_lock, flags);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -368,9 +368,9 @@ static int pkg_temp_thermal_device_add(unsigned int cpu)
|
|||
zonedev->msr_pkg_therm_high);
|
||||
|
||||
cpumask_set_cpu(cpu, &zonedev->cpumask);
|
||||
spin_lock_irq(&pkg_temp_lock);
|
||||
raw_spin_lock_irq(&pkg_temp_lock);
|
||||
zones[id] = zonedev;
|
||||
spin_unlock_irq(&pkg_temp_lock);
|
||||
raw_spin_unlock_irq(&pkg_temp_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -407,7 +407,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
|
|||
}
|
||||
|
||||
/* Protect against work and interrupts */
|
||||
spin_lock_irq(&pkg_temp_lock);
|
||||
raw_spin_lock_irq(&pkg_temp_lock);
|
||||
|
||||
/*
|
||||
* Check whether this cpu was the current target and store the new
|
||||
|
|
@ -439,9 +439,9 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
|
|||
* To cancel the work we need to drop the lock, otherwise
|
||||
* we might deadlock if the work needs to be flushed.
|
||||
*/
|
||||
spin_unlock_irq(&pkg_temp_lock);
|
||||
raw_spin_unlock_irq(&pkg_temp_lock);
|
||||
cancel_delayed_work_sync(&zonedev->work);
|
||||
spin_lock_irq(&pkg_temp_lock);
|
||||
raw_spin_lock_irq(&pkg_temp_lock);
|
||||
/*
|
||||
* If this is not the last cpu in the package and the work
|
||||
* did not run after we dropped the lock above, then we
|
||||
|
|
@ -452,7 +452,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
|
|||
pkg_thermal_schedule_work(target, &zonedev->work);
|
||||
}
|
||||
|
||||
spin_unlock_irq(&pkg_temp_lock);
|
||||
raw_spin_unlock_irq(&pkg_temp_lock);
|
||||
|
||||
/* Final cleanup if this is the last cpu */
|
||||
if (lastcpu)
|
||||
|
|
|
|||
|
|
@ -1704,7 +1704,7 @@ static void ffs_data_put(struct ffs_data *ffs)
|
|||
pr_info("%s(): freeing\n", __func__);
|
||||
ffs_data_clear(ffs);
|
||||
BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
|
||||
waitqueue_active(&ffs->ep0req_completion.wait) ||
|
||||
swait_active(&ffs->ep0req_completion.wait) ||
|
||||
waitqueue_active(&ffs->wait));
|
||||
destroy_workqueue(ffs->io_completion_wq);
|
||||
kfree(ffs->dev_name);
|
||||
|
|
|
|||
|
|
@ -344,7 +344,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
|
|||
spin_unlock_irq (&epdata->dev->lock);
|
||||
|
||||
if (likely (value == 0)) {
|
||||
value = wait_event_interruptible (done.wait, done.done);
|
||||
value = wait_for_completion_interruptible(&done);
|
||||
if (value != 0) {
|
||||
spin_lock_irq (&epdata->dev->lock);
|
||||
if (likely (epdata->ep != NULL)) {
|
||||
|
|
@ -353,7 +353,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
|
|||
usb_ep_dequeue (epdata->ep, epdata->req);
|
||||
spin_unlock_irq (&epdata->dev->lock);
|
||||
|
||||
wait_event (done.wait, done.done);
|
||||
wait_for_completion(&done);
|
||||
if (epdata->status == -ECONNRESET)
|
||||
epdata->status = -EINTR;
|
||||
} else {
|
||||
|
|
|
|||
19
fs/buffer.c
19
fs/buffer.c
|
|
@ -274,8 +274,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
* decide that the page is now completely done.
|
||||
*/
|
||||
first = page_buffers(page);
|
||||
local_irq_save(flags);
|
||||
bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
|
||||
spin_lock_irqsave(&first->b_uptodate_lock, flags);
|
||||
clear_buffer_async_read(bh);
|
||||
unlock_buffer(bh);
|
||||
tmp = bh;
|
||||
|
|
@ -288,8 +287,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
}
|
||||
tmp = tmp->b_this_page;
|
||||
} while (tmp != bh);
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
|
||||
/*
|
||||
* If none of the buffers had errors and they are all
|
||||
|
|
@ -301,8 +299,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
return;
|
||||
|
||||
still_busy:
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
return;
|
||||
}
|
||||
|
||||
|
|
@ -371,8 +368,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
|
|||
}
|
||||
|
||||
first = page_buffers(page);
|
||||
local_irq_save(flags);
|
||||
bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
|
||||
spin_lock_irqsave(&first->b_uptodate_lock, flags);
|
||||
|
||||
clear_buffer_async_write(bh);
|
||||
unlock_buffer(bh);
|
||||
|
|
@ -384,14 +380,12 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
|
|||
}
|
||||
tmp = tmp->b_this_page;
|
||||
}
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
end_page_writeback(page);
|
||||
return;
|
||||
|
||||
still_busy:
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
return;
|
||||
}
|
||||
EXPORT_SYMBOL(end_buffer_async_write);
|
||||
|
|
@ -3342,6 +3336,7 @@ struct buffer_head *alloc_buffer_head(gfp_t gfp_flags)
|
|||
struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags);
|
||||
if (ret) {
|
||||
INIT_LIST_HEAD(&ret->b_assoc_buffers);
|
||||
spin_lock_init(&ret->b_uptodate_lock);
|
||||
preempt_disable();
|
||||
__this_cpu_inc(bh_accounting.nr);
|
||||
recalc_bh_state();
|
||||
|
|
|
|||
|
|
@ -125,11 +125,10 @@ static void ext4_finish_bio(struct bio *bio)
|
|||
}
|
||||
bh = head = page_buffers(page);
|
||||
/*
|
||||
* We check all buffers in the page under BH_Uptodate_Lock
|
||||
* We check all buffers in the page under b_uptodate_lock
|
||||
* to avoid races with other end io clearing async_write flags
|
||||
*/
|
||||
local_irq_save(flags);
|
||||
bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
|
||||
spin_lock_irqsave(&head->b_uptodate_lock, flags);
|
||||
do {
|
||||
if (bh_offset(bh) < bio_start ||
|
||||
bh_offset(bh) + bh->b_size > bio_end) {
|
||||
|
|
@ -141,8 +140,7 @@ static void ext4_finish_bio(struct bio *bio)
|
|||
if (bio->bi_status)
|
||||
buffer_io_error(bh);
|
||||
} while ((bh = bh->b_this_page) != head);
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&head->b_uptodate_lock, flags);
|
||||
if (!under_io) {
|
||||
fscrypt_free_bounce_page(bounce_page);
|
||||
end_page_writeback(page);
|
||||
|
|
|
|||
|
|
@ -92,8 +92,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
"0x%llx.", (unsigned long long)bh->b_blocknr);
|
||||
}
|
||||
first = page_buffers(page);
|
||||
local_irq_save(flags);
|
||||
bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
|
||||
spin_lock_irqsave(&first->b_uptodate_lock, flags);
|
||||
clear_buffer_async_read(bh);
|
||||
unlock_buffer(bh);
|
||||
tmp = bh;
|
||||
|
|
@ -108,8 +107,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
}
|
||||
tmp = tmp->b_this_page;
|
||||
} while (tmp != bh);
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
/*
|
||||
* If none of the buffers had errors then we can set the page uptodate,
|
||||
* but we first have to perform the post read mst fixups, if the
|
||||
|
|
@ -142,8 +140,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
|
|||
unlock_page(page);
|
||||
return;
|
||||
still_busy:
|
||||
bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
|
||||
local_irq_restore(flags);
|
||||
spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
|
||||
return;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -80,7 +80,7 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
|
|||
|
||||
#ifdef CONFIG_ACPI
|
||||
|
||||
#include <linux/proc_fs.h>
|
||||
struct proc_dir_entry;
|
||||
|
||||
#define ACPI_BUS_FILE_ROOT "acpi"
|
||||
extern struct proc_dir_entry *acpi_root_dir;
|
||||
|
|
|
|||
|
|
@ -4,8 +4,9 @@
|
|||
|
||||
/*
|
||||
* For the benefit of those who are trying to port Linux to another
|
||||
* architecture, here are some C-language equivalents. You should
|
||||
* recode these in the native assembly language, if at all possible.
|
||||
* architecture, here are some C-language equivalents. They should
|
||||
* generate reasonable code, so take a look at what your compiler spits
|
||||
* out before rolling your own buggy implementation in assembly language.
|
||||
*
|
||||
* C language equivalents written by Theodore Ts'o, 9/26/92
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -34,7 +34,6 @@ arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, u32 __user *uaddr)
|
|||
u32 tmp;
|
||||
|
||||
preempt_disable();
|
||||
pagefault_disable();
|
||||
|
||||
ret = -EFAULT;
|
||||
if (unlikely(get_user(oldval, uaddr) != 0))
|
||||
|
|
@ -67,7 +66,6 @@ arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, u32 __user *uaddr)
|
|||
ret = -EFAULT;
|
||||
|
||||
out_pagefault_enable:
|
||||
pagefault_enable();
|
||||
preempt_enable();
|
||||
|
||||
if (ret == 0)
|
||||
|
|
|
|||
|
|
@ -22,9 +22,6 @@ enum bh_state_bits {
|
|||
BH_Dirty, /* Is dirty */
|
||||
BH_Lock, /* Is locked */
|
||||
BH_Req, /* Has been submitted for I/O */
|
||||
BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise
|
||||
* IO completion of other buffers in the page
|
||||
*/
|
||||
|
||||
BH_Mapped, /* Has a disk mapping */
|
||||
BH_New, /* Disk mapping was newly created by get_block */
|
||||
|
|
@ -76,6 +73,9 @@ struct buffer_head {
|
|||
struct address_space *b_assoc_map; /* mapping this buffer is
|
||||
associated with */
|
||||
atomic_t b_count; /* users using this buffer_head */
|
||||
spinlock_t b_uptodate_lock; /* Used by the first bh in a page, to
|
||||
* serialise IO completion of other
|
||||
* buffers in the page */
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -9,7 +9,7 @@
|
|||
* See kernel/sched/completion.c for details.
|
||||
*/
|
||||
|
||||
#include <linux/wait.h>
|
||||
#include <linux/swait.h>
|
||||
|
||||
/*
|
||||
* struct completion - structure used to maintain state for a "completion"
|
||||
|
|
@ -25,7 +25,7 @@
|
|||
*/
|
||||
struct completion {
|
||||
unsigned int done;
|
||||
wait_queue_head_t wait;
|
||||
struct swait_queue_head wait;
|
||||
};
|
||||
|
||||
#define init_completion_map(x, m) __init_completion(x)
|
||||
|
|
@ -34,7 +34,7 @@ static inline void complete_acquire(struct completion *x) {}
|
|||
static inline void complete_release(struct completion *x) {}
|
||||
|
||||
#define COMPLETION_INITIALIZER(work) \
|
||||
{ 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
|
||||
{ 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
|
||||
|
||||
#define COMPLETION_INITIALIZER_ONSTACK_MAP(work, map) \
|
||||
(*({ init_completion_map(&(work), &(map)); &(work); }))
|
||||
|
|
@ -85,7 +85,7 @@ static inline void complete_release(struct completion *x) {}
|
|||
static inline void __init_completion(struct completion *x)
|
||||
{
|
||||
x->done = 0;
|
||||
init_waitqueue_head(&x->wait);
|
||||
init_swait_queue_head(&x->wait);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -18,6 +18,8 @@
|
|||
|
||||
/* Doesn't want IPI, wait for tick: */
|
||||
#define IRQ_WORK_LAZY BIT(2)
|
||||
/* Run hard IRQ context, even on RT */
|
||||
#define IRQ_WORK_HARD_IRQ BIT(3)
|
||||
|
||||
#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
|
||||
|
||||
|
|
|
|||
|
|
@ -37,7 +37,12 @@
|
|||
# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
|
||||
# define trace_hardirq_enter() \
|
||||
do { \
|
||||
current->hardirq_context++; \
|
||||
if (!current->hardirq_context++) \
|
||||
current->hardirq_threaded = 0; \
|
||||
} while (0)
|
||||
# define trace_hardirq_threaded() \
|
||||
do { \
|
||||
current->hardirq_threaded = 1; \
|
||||
} while (0)
|
||||
# define trace_hardirq_exit() \
|
||||
do { \
|
||||
|
|
@ -51,6 +56,40 @@ do { \
|
|||
do { \
|
||||
current->softirq_context--; \
|
||||
} while (0)
|
||||
|
||||
# define lockdep_hrtimer_enter(__hrtimer) \
|
||||
do { \
|
||||
if (!__hrtimer->is_hard) \
|
||||
current->irq_config = 1; \
|
||||
} while (0)
|
||||
|
||||
# define lockdep_hrtimer_exit(__hrtimer) \
|
||||
do { \
|
||||
if (!__hrtimer->is_hard) \
|
||||
current->irq_config = 0; \
|
||||
} while (0)
|
||||
|
||||
# define lockdep_posixtimer_enter() \
|
||||
do { \
|
||||
current->irq_config = 1; \
|
||||
} while (0)
|
||||
|
||||
# define lockdep_posixtimer_exit() \
|
||||
do { \
|
||||
current->irq_config = 0; \
|
||||
} while (0)
|
||||
|
||||
# define lockdep_irq_work_enter(__work) \
|
||||
do { \
|
||||
if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
|
||||
current->irq_config = 1; \
|
||||
} while (0)
|
||||
# define lockdep_irq_work_exit(__work) \
|
||||
do { \
|
||||
if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
|
||||
current->irq_config = 0; \
|
||||
} while (0)
|
||||
|
||||
#else
|
||||
# define trace_hardirqs_on() do { } while (0)
|
||||
# define trace_hardirqs_off() do { } while (0)
|
||||
|
|
@ -59,9 +98,16 @@ do { \
|
|||
# define trace_hardirqs_enabled(p) 0
|
||||
# define trace_softirqs_enabled(p) 0
|
||||
# define trace_hardirq_enter() do { } while (0)
|
||||
# define trace_hardirq_threaded() do { } while (0)
|
||||
# define trace_hardirq_exit() do { } while (0)
|
||||
# define lockdep_softirq_enter() do { } while (0)
|
||||
# define lockdep_softirq_exit() do { } while (0)
|
||||
# define lockdep_hrtimer_enter(__hrtimer) do { } while (0)
|
||||
# define lockdep_hrtimer_exit(__hrtimer) do { } while (0)
|
||||
# define lockdep_posixtimer_enter() do { } while (0)
|
||||
# define lockdep_posixtimer_exit() do { } while (0)
|
||||
# define lockdep_irq_work_enter(__work) do { } while (0)
|
||||
# define lockdep_irq_work_exit(__work) do { } while (0)
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_IRQSOFF_TRACER) || \
|
||||
|
|
|
|||
|
|
@ -21,6 +21,22 @@ extern int lock_stat;
|
|||
|
||||
#include <linux/types.h>
|
||||
|
||||
enum lockdep_wait_type {
|
||||
LD_WAIT_INV = 0, /* not checked, catch all */
|
||||
|
||||
LD_WAIT_FREE, /* wait free, rcu etc.. */
|
||||
LD_WAIT_SPIN, /* spin loops, raw_spinlock_t etc.. */
|
||||
|
||||
#ifdef CONFIG_PROVE_RAW_LOCK_NESTING
|
||||
LD_WAIT_CONFIG, /* CONFIG_PREEMPT_LOCK, spinlock_t etc.. */
|
||||
#else
|
||||
LD_WAIT_CONFIG = LD_WAIT_SPIN,
|
||||
#endif
|
||||
LD_WAIT_SLEEP, /* sleeping locks, mutex_t etc.. */
|
||||
|
||||
LD_WAIT_MAX, /* must be last */
|
||||
};
|
||||
|
||||
#ifdef CONFIG_LOCKDEP
|
||||
|
||||
#include <linux/linkage.h>
|
||||
|
|
@ -111,6 +127,9 @@ struct lock_class {
|
|||
int name_version;
|
||||
const char *name;
|
||||
|
||||
short wait_type_inner;
|
||||
short wait_type_outer;
|
||||
|
||||
#ifdef CONFIG_LOCK_STAT
|
||||
unsigned long contention_point[LOCKSTAT_POINTS];
|
||||
unsigned long contending_point[LOCKSTAT_POINTS];
|
||||
|
|
@ -158,6 +177,8 @@ struct lockdep_map {
|
|||
struct lock_class_key *key;
|
||||
struct lock_class *class_cache[NR_LOCKDEP_CACHING_CLASSES];
|
||||
const char *name;
|
||||
short wait_type_outer; /* can be taken in this context */
|
||||
short wait_type_inner; /* presents this context */
|
||||
#ifdef CONFIG_LOCK_STAT
|
||||
int cpu;
|
||||
unsigned long ip;
|
||||
|
|
@ -299,8 +320,21 @@ extern void lockdep_unregister_key(struct lock_class_key *key);
|
|||
* to lockdep:
|
||||
*/
|
||||
|
||||
extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
|
||||
struct lock_class_key *key, int subclass);
|
||||
extern void lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
|
||||
struct lock_class_key *key, int subclass, short inner, short outer);
|
||||
|
||||
static inline void
|
||||
lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
|
||||
struct lock_class_key *key, int subclass, short inner)
|
||||
{
|
||||
lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
|
||||
}
|
||||
|
||||
static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
|
||||
struct lock_class_key *key, int subclass)
|
||||
{
|
||||
lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
|
||||
}
|
||||
|
||||
/*
|
||||
* Reinitialize a lock key - for cases where there is special locking or
|
||||
|
|
@ -308,18 +342,29 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
|
|||
* of dependencies wrong: they are either too broad (they need a class-split)
|
||||
* or they are too narrow (they suffer from a false class-split):
|
||||
*/
|
||||
#define lockdep_set_class(lock, key) \
|
||||
lockdep_init_map(&(lock)->dep_map, #key, key, 0)
|
||||
#define lockdep_set_class_and_name(lock, key, name) \
|
||||
lockdep_init_map(&(lock)->dep_map, name, key, 0)
|
||||
#define lockdep_set_class_and_subclass(lock, key, sub) \
|
||||
lockdep_init_map(&(lock)->dep_map, #key, key, sub)
|
||||
#define lockdep_set_subclass(lock, sub) \
|
||||
lockdep_init_map(&(lock)->dep_map, #lock, \
|
||||
(lock)->dep_map.key, sub)
|
||||
#define lockdep_set_class(lock, key) \
|
||||
lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0, \
|
||||
(lock)->dep_map.wait_type_inner, \
|
||||
(lock)->dep_map.wait_type_outer)
|
||||
|
||||
#define lockdep_set_class_and_name(lock, key, name) \
|
||||
lockdep_init_map_waits(&(lock)->dep_map, name, key, 0, \
|
||||
(lock)->dep_map.wait_type_inner, \
|
||||
(lock)->dep_map.wait_type_outer)
|
||||
|
||||
#define lockdep_set_class_and_subclass(lock, key, sub) \
|
||||
lockdep_init_map_waits(&(lock)->dep_map, #key, key, sub,\
|
||||
(lock)->dep_map.wait_type_inner, \
|
||||
(lock)->dep_map.wait_type_outer)
|
||||
|
||||
#define lockdep_set_subclass(lock, sub) \
|
||||
lockdep_init_map_waits(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
|
||||
(lock)->dep_map.wait_type_inner, \
|
||||
(lock)->dep_map.wait_type_outer)
|
||||
|
||||
#define lockdep_set_novalidate_class(lock) \
|
||||
lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
|
||||
|
||||
/*
|
||||
* Compare locking classes
|
||||
*/
|
||||
|
|
@ -432,6 +477,10 @@ static inline void lockdep_set_selftest_task(struct task_struct *task)
|
|||
# define lock_set_class(l, n, k, s, i) do { } while (0)
|
||||
# define lock_set_subclass(l, s, i) do { } while (0)
|
||||
# define lockdep_init() do { } while (0)
|
||||
# define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
|
||||
do { (void)(name); (void)(key); } while (0)
|
||||
# define lockdep_init_map_wait(lock, name, key, sub, inner) \
|
||||
do { (void)(name); (void)(key); } while (0)
|
||||
# define lockdep_init_map(lock, name, key, sub) \
|
||||
do { (void)(name); (void)(key); } while (0)
|
||||
# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
|
||||
|
|
@ -662,6 +711,21 @@ do { \
|
|||
# define lockdep_assert_in_irq() do { } while (0)
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PROVE_RAW_LOCK_NESTING
|
||||
|
||||
# define lockdep_assert_RT_in_threaded_ctx() do { \
|
||||
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
|
||||
current->hardirq_context && \
|
||||
!(current->hardirq_threaded || current->irq_config), \
|
||||
"Not in threaded context on PREEMPT_RT as expected\n"); \
|
||||
} while (0)
|
||||
|
||||
#else
|
||||
|
||||
# define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
|
||||
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_LOCKDEP
|
||||
void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
|
||||
#else
|
||||
|
|
|
|||
|
|
@ -109,8 +109,11 @@ do { \
|
|||
} while (0)
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
|
||||
, .dep_map = { .name = #lockname }
|
||||
# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
|
||||
, .dep_map = { \
|
||||
.name = #lockname, \
|
||||
.wait_type_inner = LD_WAIT_SLEEP, \
|
||||
}
|
||||
#else
|
||||
# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -3,41 +3,52 @@
|
|||
#define _LINUX_PERCPU_RWSEM_H
|
||||
|
||||
#include <linux/atomic.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/percpu.h>
|
||||
#include <linux/rcuwait.h>
|
||||
#include <linux/wait.h>
|
||||
#include <linux/rcu_sync.h>
|
||||
#include <linux/lockdep.h>
|
||||
|
||||
struct percpu_rw_semaphore {
|
||||
struct rcu_sync rss;
|
||||
unsigned int __percpu *read_count;
|
||||
struct rw_semaphore rw_sem; /* slowpath */
|
||||
struct rcuwait writer; /* blocked writer */
|
||||
int readers_block;
|
||||
struct rcuwait writer;
|
||||
wait_queue_head_t waiters;
|
||||
atomic_t block;
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
struct lockdep_map dep_map;
|
||||
#endif
|
||||
};
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
#define __PERCPU_RWSEM_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname },
|
||||
#else
|
||||
#define __PERCPU_RWSEM_DEP_MAP_INIT(lockname)
|
||||
#endif
|
||||
|
||||
#define __DEFINE_PERCPU_RWSEM(name, is_static) \
|
||||
static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_rc_##name); \
|
||||
is_static struct percpu_rw_semaphore name = { \
|
||||
.rss = __RCU_SYNC_INITIALIZER(name.rss), \
|
||||
.read_count = &__percpu_rwsem_rc_##name, \
|
||||
.rw_sem = __RWSEM_INITIALIZER(name.rw_sem), \
|
||||
.writer = __RCUWAIT_INITIALIZER(name.writer), \
|
||||
.waiters = __WAIT_QUEUE_HEAD_INITIALIZER(name.waiters), \
|
||||
.block = ATOMIC_INIT(0), \
|
||||
__PERCPU_RWSEM_DEP_MAP_INIT(name) \
|
||||
}
|
||||
|
||||
#define DEFINE_PERCPU_RWSEM(name) \
|
||||
__DEFINE_PERCPU_RWSEM(name, /* not static */)
|
||||
#define DEFINE_STATIC_PERCPU_RWSEM(name) \
|
||||
__DEFINE_PERCPU_RWSEM(name, static)
|
||||
|
||||
extern int __percpu_down_read(struct percpu_rw_semaphore *, int);
|
||||
extern void __percpu_up_read(struct percpu_rw_semaphore *);
|
||||
extern bool __percpu_down_read(struct percpu_rw_semaphore *, bool);
|
||||
|
||||
static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
rwsem_acquire_read(&sem->rw_sem.dep_map, 0, 0, _RET_IP_);
|
||||
rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_);
|
||||
|
||||
preempt_disable();
|
||||
/*
|
||||
|
|
@ -48,8 +59,9 @@ static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
|
|||
* and that once the synchronize_rcu() is done, the writer will see
|
||||
* anything we did within this RCU-sched read-size critical section.
|
||||
*/
|
||||
__this_cpu_inc(*sem->read_count);
|
||||
if (unlikely(!rcu_sync_is_idle(&sem->rss)))
|
||||
if (likely(rcu_sync_is_idle(&sem->rss)))
|
||||
__this_cpu_inc(*sem->read_count);
|
||||
else
|
||||
__percpu_down_read(sem, false); /* Unconditional memory barrier */
|
||||
/*
|
||||
* The preempt_enable() prevents the compiler from
|
||||
|
|
@ -58,16 +70,17 @@ static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
|
|||
preempt_enable();
|
||||
}
|
||||
|
||||
static inline int percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
|
||||
static inline bool percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
int ret = 1;
|
||||
bool ret = true;
|
||||
|
||||
preempt_disable();
|
||||
/*
|
||||
* Same as in percpu_down_read().
|
||||
*/
|
||||
__this_cpu_inc(*sem->read_count);
|
||||
if (unlikely(!rcu_sync_is_idle(&sem->rss)))
|
||||
if (likely(rcu_sync_is_idle(&sem->rss)))
|
||||
__this_cpu_inc(*sem->read_count);
|
||||
else
|
||||
ret = __percpu_down_read(sem, true); /* Unconditional memory barrier */
|
||||
preempt_enable();
|
||||
/*
|
||||
|
|
@ -76,24 +89,36 @@ static inline int percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
|
|||
*/
|
||||
|
||||
if (ret)
|
||||
rwsem_acquire_read(&sem->rw_sem.dep_map, 0, 1, _RET_IP_);
|
||||
rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
rwsem_release(&sem->dep_map, _RET_IP_);
|
||||
|
||||
preempt_disable();
|
||||
/*
|
||||
* Same as in percpu_down_read().
|
||||
*/
|
||||
if (likely(rcu_sync_is_idle(&sem->rss)))
|
||||
if (likely(rcu_sync_is_idle(&sem->rss))) {
|
||||
__this_cpu_dec(*sem->read_count);
|
||||
else
|
||||
__percpu_up_read(sem); /* Unconditional memory barrier */
|
||||
} else {
|
||||
/*
|
||||
* slowpath; reader will only ever wake a single blocked
|
||||
* writer.
|
||||
*/
|
||||
smp_mb(); /* B matches C */
|
||||
/*
|
||||
* In other words, if they see our decrement (presumably to
|
||||
* aggregate zero, as that is the only time it matters) they
|
||||
* will also see our critical section.
|
||||
*/
|
||||
__this_cpu_dec(*sem->read_count);
|
||||
rcuwait_wake_up(&sem->writer);
|
||||
}
|
||||
preempt_enable();
|
||||
|
||||
rwsem_release(&sem->rw_sem.dep_map, _RET_IP_);
|
||||
}
|
||||
|
||||
extern void percpu_down_write(struct percpu_rw_semaphore *);
|
||||
|
|
@ -110,29 +135,19 @@ extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
|
|||
__percpu_init_rwsem(sem, #sem, &rwsem_key); \
|
||||
})
|
||||
|
||||
#define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem)
|
||||
|
||||
#define percpu_rwsem_assert_held(sem) \
|
||||
lockdep_assert_held(&(sem)->rw_sem)
|
||||
#define percpu_rwsem_is_held(sem) lockdep_is_held(sem)
|
||||
#define percpu_rwsem_assert_held(sem) lockdep_assert_held(sem)
|
||||
|
||||
static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
|
||||
bool read, unsigned long ip)
|
||||
{
|
||||
lock_release(&sem->rw_sem.dep_map, ip);
|
||||
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
|
||||
if (!read)
|
||||
atomic_long_set(&sem->rw_sem.owner, RWSEM_OWNER_UNKNOWN);
|
||||
#endif
|
||||
lock_release(&sem->dep_map, ip);
|
||||
}
|
||||
|
||||
static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem,
|
||||
bool read, unsigned long ip)
|
||||
{
|
||||
lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip);
|
||||
#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
|
||||
if (!read)
|
||||
atomic_long_set(&sem->rw_sem.owner, (long)current);
|
||||
#endif
|
||||
lock_acquire(&sem->dep_map, 0, 1, read, 1, NULL, ip);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -3,6 +3,7 @@
|
|||
#define _LINUX_RCUWAIT_H_
|
||||
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
/*
|
||||
* rcuwait provides a way of blocking and waking up a single
|
||||
|
|
@ -30,23 +31,30 @@ extern void rcuwait_wake_up(struct rcuwait *w);
|
|||
* The caller is responsible for locking around rcuwait_wait_event(),
|
||||
* such that writes to @task are properly serialized.
|
||||
*/
|
||||
#define rcuwait_wait_event(w, condition) \
|
||||
#define rcuwait_wait_event(w, condition, state) \
|
||||
({ \
|
||||
int __ret = 0; \
|
||||
rcu_assign_pointer((w)->task, current); \
|
||||
for (;;) { \
|
||||
/* \
|
||||
* Implicit barrier (A) pairs with (B) in \
|
||||
* rcuwait_wake_up(). \
|
||||
*/ \
|
||||
set_current_state(TASK_UNINTERRUPTIBLE); \
|
||||
set_current_state(state); \
|
||||
if (condition) \
|
||||
break; \
|
||||
\
|
||||
if (signal_pending_state(state, current)) { \
|
||||
__ret = -EINTR; \
|
||||
break; \
|
||||
} \
|
||||
\
|
||||
schedule(); \
|
||||
} \
|
||||
\
|
||||
WRITE_ONCE((w)->task, NULL); \
|
||||
__set_current_state(TASK_RUNNING); \
|
||||
__ret; \
|
||||
})
|
||||
|
||||
#endif /* _LINUX_RCUWAIT_H_ */
|
||||
|
|
|
|||
|
|
@ -22,7 +22,11 @@ typedef struct {
|
|||
#define RWLOCK_MAGIC 0xdeaf1eed
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
|
||||
# define RW_DEP_MAP_INIT(lockname) \
|
||||
.dep_map = { \
|
||||
.name = #lockname, \
|
||||
.wait_type_inner = LD_WAIT_CONFIG, \
|
||||
}
|
||||
#else
|
||||
# define RW_DEP_MAP_INIT(lockname)
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -53,12 +53,6 @@ struct rw_semaphore {
|
|||
#endif
|
||||
};
|
||||
|
||||
/*
|
||||
* Setting all bits of the owner field except bit 0 will indicate
|
||||
* that the rwsem is writer-owned with an unknown owner.
|
||||
*/
|
||||
#define RWSEM_OWNER_UNKNOWN (-2L)
|
||||
|
||||
/* In all implementations count != 0 means locked */
|
||||
static inline int rwsem_is_locked(struct rw_semaphore *sem)
|
||||
{
|
||||
|
|
@ -71,7 +65,11 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
|
|||
/* Common initializer macros and functions */
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
# define __RWSEM_DEP_MAP_INIT(lockname) , .dep_map = { .name = #lockname }
|
||||
# define __RWSEM_DEP_MAP_INIT(lockname) \
|
||||
, .dep_map = { \
|
||||
.name = #lockname, \
|
||||
.wait_type_inner = LD_WAIT_SLEEP, \
|
||||
}
|
||||
#else
|
||||
# define __RWSEM_DEP_MAP_INIT(lockname)
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -970,6 +970,7 @@ struct task_struct {
|
|||
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
unsigned int irq_events;
|
||||
unsigned int hardirq_threaded;
|
||||
unsigned long hardirq_enable_ip;
|
||||
unsigned long hardirq_disable_ip;
|
||||
unsigned int hardirq_enable_event;
|
||||
|
|
@ -982,6 +983,7 @@ struct task_struct {
|
|||
unsigned int softirq_enable_event;
|
||||
int softirqs_enabled;
|
||||
int softirq_context;
|
||||
int irq_config;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_LOCKDEP
|
||||
|
|
|
|||
|
|
@ -93,12 +93,13 @@
|
|||
|
||||
#ifdef CONFIG_DEBUG_SPINLOCK
|
||||
extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
|
||||
struct lock_class_key *key);
|
||||
# define raw_spin_lock_init(lock) \
|
||||
do { \
|
||||
static struct lock_class_key __key; \
|
||||
\
|
||||
__raw_spin_lock_init((lock), #lock, &__key); \
|
||||
struct lock_class_key *key, short inner);
|
||||
|
||||
# define raw_spin_lock_init(lock) \
|
||||
do { \
|
||||
static struct lock_class_key __key; \
|
||||
\
|
||||
__raw_spin_lock_init((lock), #lock, &__key, LD_WAIT_SPIN); \
|
||||
} while (0)
|
||||
|
||||
#else
|
||||
|
|
@ -327,12 +328,26 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
|
|||
return &lock->rlock;
|
||||
}
|
||||
|
||||
#define spin_lock_init(_lock) \
|
||||
do { \
|
||||
spinlock_check(_lock); \
|
||||
raw_spin_lock_init(&(_lock)->rlock); \
|
||||
#ifdef CONFIG_DEBUG_SPINLOCK
|
||||
|
||||
# define spin_lock_init(lock) \
|
||||
do { \
|
||||
static struct lock_class_key __key; \
|
||||
\
|
||||
__raw_spin_lock_init(spinlock_check(lock), \
|
||||
#lock, &__key, LD_WAIT_CONFIG); \
|
||||
} while (0)
|
||||
|
||||
#else
|
||||
|
||||
# define spin_lock_init(_lock) \
|
||||
do { \
|
||||
spinlock_check(_lock); \
|
||||
*(_lock) = __SPIN_LOCK_UNLOCKED(_lock); \
|
||||
} while (0)
|
||||
|
||||
#endif
|
||||
|
||||
static __always_inline void spin_lock(spinlock_t *lock)
|
||||
{
|
||||
raw_spin_lock(&lock->rlock);
|
||||
|
|
|
|||
|
|
@ -33,8 +33,18 @@ typedef struct raw_spinlock {
|
|||
#define SPINLOCK_OWNER_INIT ((void *)-1L)
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
|
||||
# define RAW_SPIN_DEP_MAP_INIT(lockname) \
|
||||
.dep_map = { \
|
||||
.name = #lockname, \
|
||||
.wait_type_inner = LD_WAIT_SPIN, \
|
||||
}
|
||||
# define SPIN_DEP_MAP_INIT(lockname) \
|
||||
.dep_map = { \
|
||||
.name = #lockname, \
|
||||
.wait_type_inner = LD_WAIT_CONFIG, \
|
||||
}
|
||||
#else
|
||||
# define RAW_SPIN_DEP_MAP_INIT(lockname)
|
||||
# define SPIN_DEP_MAP_INIT(lockname)
|
||||
#endif
|
||||
|
||||
|
|
@ -51,7 +61,7 @@ typedef struct raw_spinlock {
|
|||
{ \
|
||||
.raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
|
||||
SPIN_DEBUG_INIT(lockname) \
|
||||
SPIN_DEP_MAP_INIT(lockname) }
|
||||
RAW_SPIN_DEP_MAP_INIT(lockname) }
|
||||
|
||||
#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
|
||||
(raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
|
||||
|
|
@ -72,11 +82,17 @@ typedef struct spinlock {
|
|||
};
|
||||
} spinlock_t;
|
||||
|
||||
#define ___SPIN_LOCK_INITIALIZER(lockname) \
|
||||
{ \
|
||||
.raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
|
||||
SPIN_DEBUG_INIT(lockname) \
|
||||
SPIN_DEP_MAP_INIT(lockname) }
|
||||
|
||||
#define __SPIN_LOCK_INITIALIZER(lockname) \
|
||||
{ { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
|
||||
{ { .rlock = ___SPIN_LOCK_INITIALIZER(lockname) } }
|
||||
|
||||
#define __SPIN_LOCK_UNLOCKED(lockname) \
|
||||
(spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
|
||||
(spinlock_t) __SPIN_LOCK_INITIALIZER(lockname)
|
||||
|
||||
#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
|
||||
|
||||
|
|
|
|||
|
|
@ -20,6 +20,7 @@ int default_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int
|
|||
#define WQ_FLAG_EXCLUSIVE 0x01
|
||||
#define WQ_FLAG_WOKEN 0x02
|
||||
#define WQ_FLAG_BOOKMARK 0x04
|
||||
#define WQ_FLAG_CUSTOM 0x08
|
||||
|
||||
/*
|
||||
* A single wait-queue entry structure:
|
||||
|
|
|
|||
|
|
@ -331,12 +331,12 @@ void lockdep_assert_cpus_held(void)
|
|||
|
||||
static void lockdep_acquire_cpus_lock(void)
|
||||
{
|
||||
rwsem_acquire(&cpu_hotplug_lock.rw_sem.dep_map, 0, 0, _THIS_IP_);
|
||||
rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 0, _THIS_IP_);
|
||||
}
|
||||
|
||||
static void lockdep_release_cpus_lock(void)
|
||||
{
|
||||
rwsem_release(&cpu_hotplug_lock.rw_sem.dep_map, _THIS_IP_);
|
||||
rwsem_release(&cpu_hotplug_lock.dep_map, _THIS_IP_);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -258,6 +258,7 @@ void rcuwait_wake_up(struct rcuwait *w)
|
|||
wake_up_process(task);
|
||||
rcu_read_unlock();
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(rcuwait_wake_up);
|
||||
|
||||
/*
|
||||
* Determine if a process group is "orphaned", according to the POSIX
|
||||
|
|
|
|||
107
kernel/futex.c
107
kernel/futex.c
|
|
@ -135,8 +135,7 @@
|
|||
*
|
||||
* Where (A) orders the waiters increment and the futex value read through
|
||||
* atomic operations (see hb_waiters_inc) and where (B) orders the write
|
||||
* to futex and the waiters read -- this is done by the barriers for both
|
||||
* shared and private futexes in get_futex_key_refs().
|
||||
* to futex and the waiters read (see hb_waiters_pending()).
|
||||
*
|
||||
* This yields the following case (where X:=waiters, Y:=futex):
|
||||
*
|
||||
|
|
@ -331,17 +330,6 @@ static void compat_exit_robust_list(struct task_struct *curr);
|
|||
static inline void compat_exit_robust_list(struct task_struct *curr) { }
|
||||
#endif
|
||||
|
||||
static inline void futex_get_mm(union futex_key *key)
|
||||
{
|
||||
mmgrab(key->private.mm);
|
||||
/*
|
||||
* Ensure futex_get_mm() implies a full barrier such that
|
||||
* get_futex_key() implies a full barrier. This is relied upon
|
||||
* as smp_mb(); (B), see the ordering comment above.
|
||||
*/
|
||||
smp_mb__after_atomic();
|
||||
}
|
||||
|
||||
/*
|
||||
* Reflects a new waiter being added to the waitqueue.
|
||||
*/
|
||||
|
|
@ -370,6 +358,10 @@ static inline void hb_waiters_dec(struct futex_hash_bucket *hb)
|
|||
static inline int hb_waiters_pending(struct futex_hash_bucket *hb)
|
||||
{
|
||||
#ifdef CONFIG_SMP
|
||||
/*
|
||||
* Full barrier (B), see the ordering comment above.
|
||||
*/
|
||||
smp_mb();
|
||||
return atomic_read(&hb->waiters);
|
||||
#else
|
||||
return 1;
|
||||
|
|
@ -407,69 +399,6 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
|
|||
&& key1->both.offset == key2->both.offset);
|
||||
}
|
||||
|
||||
/*
|
||||
* Take a reference to the resource addressed by a key.
|
||||
* Can be called while holding spinlocks.
|
||||
*
|
||||
*/
|
||||
static void get_futex_key_refs(union futex_key *key)
|
||||
{
|
||||
if (!key->both.ptr)
|
||||
return;
|
||||
|
||||
/*
|
||||
* On MMU less systems futexes are always "private" as there is no per
|
||||
* process address space. We need the smp wmb nevertheless - yes,
|
||||
* arch/blackfin has MMU less SMP ...
|
||||
*/
|
||||
if (!IS_ENABLED(CONFIG_MMU)) {
|
||||
smp_mb(); /* explicit smp_mb(); (B) */
|
||||
return;
|
||||
}
|
||||
|
||||
switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
|
||||
case FUT_OFF_INODE:
|
||||
smp_mb(); /* explicit smp_mb(); (B) */
|
||||
break;
|
||||
case FUT_OFF_MMSHARED:
|
||||
futex_get_mm(key); /* implies smp_mb(); (B) */
|
||||
break;
|
||||
default:
|
||||
/*
|
||||
* Private futexes do not hold reference on an inode or
|
||||
* mm, therefore the only purpose of calling get_futex_key_refs
|
||||
* is because we need the barrier for the lockless waiter check.
|
||||
*/
|
||||
smp_mb(); /* explicit smp_mb(); (B) */
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Drop a reference to the resource addressed by a key.
|
||||
* The hash bucket spinlock must not be held. This is
|
||||
* a no-op for private futexes, see comment in the get
|
||||
* counterpart.
|
||||
*/
|
||||
static void drop_futex_key_refs(union futex_key *key)
|
||||
{
|
||||
if (!key->both.ptr) {
|
||||
/* If we're here then we tried to put a key we failed to get */
|
||||
WARN_ON_ONCE(1);
|
||||
return;
|
||||
}
|
||||
|
||||
if (!IS_ENABLED(CONFIG_MMU))
|
||||
return;
|
||||
|
||||
switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
|
||||
case FUT_OFF_INODE:
|
||||
break;
|
||||
case FUT_OFF_MMSHARED:
|
||||
mmdrop(key->private.mm);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
enum futex_access {
|
||||
FUTEX_READ,
|
||||
FUTEX_WRITE
|
||||
|
|
@ -601,7 +530,6 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
|
|||
if (!fshared) {
|
||||
key->private.mm = mm;
|
||||
key->private.address = address;
|
||||
get_futex_key_refs(key); /* implies smp_mb(); (B) */
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -741,8 +669,6 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
|
|||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
get_futex_key_refs(key); /* implies smp_mb(); (B) */
|
||||
|
||||
out:
|
||||
put_page(page);
|
||||
return err;
|
||||
|
|
@ -750,7 +676,6 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
|
|||
|
||||
static inline void put_futex_key(union futex_key *key)
|
||||
{
|
||||
drop_futex_key_refs(key);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1740,10 +1665,9 @@ static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
|
|||
oparg = 1 << oparg;
|
||||
}
|
||||
|
||||
if (!access_ok(uaddr, sizeof(u32)))
|
||||
return -EFAULT;
|
||||
|
||||
pagefault_disable();
|
||||
ret = arch_futex_atomic_op_inuser(op, oparg, &oldval, uaddr);
|
||||
pagefault_enable();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
|
|
@ -1885,7 +1809,6 @@ void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
|
|||
plist_add(&q->list, &hb2->chain);
|
||||
q->lock_ptr = &hb2->lock;
|
||||
}
|
||||
get_futex_key_refs(key2);
|
||||
q->key = *key2;
|
||||
}
|
||||
|
||||
|
|
@ -1907,7 +1830,6 @@ static inline
|
|||
void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
|
||||
struct futex_hash_bucket *hb)
|
||||
{
|
||||
get_futex_key_refs(key);
|
||||
q->key = *key;
|
||||
|
||||
__unqueue_futex(q);
|
||||
|
|
@ -2018,7 +1940,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
|
|||
u32 *cmpval, int requeue_pi)
|
||||
{
|
||||
union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
|
||||
int drop_count = 0, task_count = 0, ret;
|
||||
int task_count = 0, ret;
|
||||
struct futex_pi_state *pi_state = NULL;
|
||||
struct futex_hash_bucket *hb1, *hb2;
|
||||
struct futex_q *this, *next;
|
||||
|
|
@ -2139,7 +2061,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
|
|||
*/
|
||||
if (ret > 0) {
|
||||
WARN_ON(pi_state);
|
||||
drop_count++;
|
||||
task_count++;
|
||||
/*
|
||||
* If we acquired the lock, then the user space value
|
||||
|
|
@ -2259,7 +2180,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
|
|||
* doing so.
|
||||
*/
|
||||
requeue_pi_wake_futex(this, &key2, hb2);
|
||||
drop_count++;
|
||||
continue;
|
||||
} else if (ret) {
|
||||
/*
|
||||
|
|
@ -2280,7 +2200,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
|
|||
}
|
||||
}
|
||||
requeue_futex(this, hb1, hb2, &key2);
|
||||
drop_count++;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -2295,15 +2214,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
|
|||
wake_up_q(&wake_q);
|
||||
hb_waiters_dec(hb2);
|
||||
|
||||
/*
|
||||
* drop_futex_key_refs() must be called outside the spinlocks. During
|
||||
* the requeue we moved futex_q's from the hash bucket at key1 to the
|
||||
* one at key2 and updated their key pointer. We no longer need to
|
||||
* hold the references to key1.
|
||||
*/
|
||||
while (--drop_count >= 0)
|
||||
drop_futex_key_refs(&key1);
|
||||
|
||||
out_put_keys:
|
||||
put_futex_key(&key2);
|
||||
out_put_key1:
|
||||
|
|
@ -2433,7 +2343,6 @@ static int unqueue_me(struct futex_q *q)
|
|||
ret = 1;
|
||||
}
|
||||
|
||||
drop_futex_key_refs(&q->key);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -145,6 +145,13 @@ irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags
|
|||
for_each_action_of_desc(desc, action) {
|
||||
irqreturn_t res;
|
||||
|
||||
/*
|
||||
* If this IRQ would be threaded under force_irqthreads, mark it so.
|
||||
*/
|
||||
if (irq_settings_can_thread(desc) &&
|
||||
!(action->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)))
|
||||
trace_hardirq_threaded();
|
||||
|
||||
trace_irq_handler_entry(irq, action);
|
||||
res = action->handler(irq, action->dev_id);
|
||||
trace_irq_handler_exit(irq, action, res);
|
||||
|
|
|
|||
|
|
@ -153,7 +153,9 @@ static void irq_work_run_list(struct llist_head *list)
|
|||
*/
|
||||
flags = atomic_fetch_andnot(IRQ_WORK_PENDING, &work->flags);
|
||||
|
||||
lockdep_irq_work_enter(work);
|
||||
work->func(work);
|
||||
lockdep_irq_work_exit(work);
|
||||
/*
|
||||
* Clear the BUSY bit and return to the free state if
|
||||
* no-one else claimed it meanwhile.
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load Diff
|
|
@ -106,6 +106,12 @@ static const unsigned long LOCKF_USED_IN_IRQ_READ =
|
|||
#define STACK_TRACE_HASH_SIZE 16384
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Bit definitions for lock_chain.irq_context
|
||||
*/
|
||||
#define LOCK_CHAIN_SOFTIRQ_CONTEXT (1 << 0)
|
||||
#define LOCK_CHAIN_HARDIRQ_CONTEXT (1 << 1)
|
||||
|
||||
#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
|
||||
|
||||
#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
|
||||
|
|
@ -124,17 +130,21 @@ extern const char *__get_key_name(const struct lockdep_subclass_key *key,
|
|||
struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
|
||||
|
||||
extern unsigned long nr_lock_classes;
|
||||
extern unsigned long nr_zapped_classes;
|
||||
extern unsigned long nr_zapped_lock_chains;
|
||||
extern unsigned long nr_list_entries;
|
||||
long lockdep_next_lockchain(long i);
|
||||
unsigned long lock_chain_count(void);
|
||||
extern int nr_chain_hlocks;
|
||||
extern unsigned long nr_stack_trace_entries;
|
||||
|
||||
extern unsigned int nr_hardirq_chains;
|
||||
extern unsigned int nr_softirq_chains;
|
||||
extern unsigned int nr_process_chains;
|
||||
extern unsigned int max_lockdep_depth;
|
||||
extern unsigned int nr_free_chain_hlocks;
|
||||
extern unsigned int nr_lost_chain_hlocks;
|
||||
extern unsigned int nr_large_chain_blocks;
|
||||
|
||||
extern unsigned int max_lockdep_depth;
|
||||
extern unsigned int max_bfs_queue_depth;
|
||||
|
||||
#ifdef CONFIG_PROVE_LOCKING
|
||||
|
|
|
|||
|
|
@ -128,15 +128,22 @@ static int lc_show(struct seq_file *m, void *v)
|
|||
struct lock_chain *chain = v;
|
||||
struct lock_class *class;
|
||||
int i;
|
||||
static const char * const irq_strs[] = {
|
||||
[0] = "0",
|
||||
[LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq",
|
||||
[LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq",
|
||||
[LOCK_CHAIN_SOFTIRQ_CONTEXT|
|
||||
LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq|softirq",
|
||||
};
|
||||
|
||||
if (v == SEQ_START_TOKEN) {
|
||||
if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
|
||||
if (!nr_free_chain_hlocks)
|
||||
seq_printf(m, "(buggered) ");
|
||||
seq_printf(m, "all lock chains:\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
seq_printf(m, "irq_context: %d\n", chain->irq_context);
|
||||
seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);
|
||||
|
||||
for (i = 0; i < chain->depth; i++) {
|
||||
class = lock_chain_get_class(chain, i);
|
||||
|
|
@ -271,8 +278,12 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
|
|||
#ifdef CONFIG_PROVE_LOCKING
|
||||
seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
|
||||
lock_chain_count(), MAX_LOCKDEP_CHAINS);
|
||||
seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
|
||||
nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
|
||||
seq_printf(m, " dependency chain hlocks used: %11lu [max: %lu]\n",
|
||||
MAX_LOCKDEP_CHAIN_HLOCKS -
|
||||
(nr_free_chain_hlocks + nr_lost_chain_hlocks),
|
||||
MAX_LOCKDEP_CHAIN_HLOCKS);
|
||||
seq_printf(m, " dependency chain hlocks lost: %11u\n",
|
||||
nr_lost_chain_hlocks);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
|
|
@ -336,6 +347,18 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
|
|||
seq_printf(m, " debug_locks: %11u\n",
|
||||
debug_locks);
|
||||
|
||||
/*
|
||||
* Zappped classes and lockdep data buffers reuse statistics.
|
||||
*/
|
||||
seq_puts(m, "\n");
|
||||
seq_printf(m, " zapped classes: %11lu\n",
|
||||
nr_zapped_classes);
|
||||
#ifdef CONFIG_PROVE_LOCKING
|
||||
seq_printf(m, " zapped lock chains: %11lu\n",
|
||||
nr_zapped_lock_chains);
|
||||
seq_printf(m, " large chain blocks: %11u\n",
|
||||
nr_large_chain_blocks);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -85,7 +85,7 @@ void debug_mutex_init(struct mutex *lock, const char *name,
|
|||
* Make sure we are not reinitializing a held lock:
|
||||
*/
|
||||
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
|
||||
lockdep_init_map(&lock->dep_map, name, key, 0);
|
||||
lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_SLEEP);
|
||||
#endif
|
||||
lock->magic = lock;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,27 +1,29 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
#include <linux/atomic.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/percpu.h>
|
||||
#include <linux/wait.h>
|
||||
#include <linux/lockdep.h>
|
||||
#include <linux/percpu-rwsem.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/sched/task.h>
|
||||
#include <linux/errno.h>
|
||||
|
||||
#include "rwsem.h"
|
||||
|
||||
int __percpu_init_rwsem(struct percpu_rw_semaphore *sem,
|
||||
const char *name, struct lock_class_key *rwsem_key)
|
||||
const char *name, struct lock_class_key *key)
|
||||
{
|
||||
sem->read_count = alloc_percpu(int);
|
||||
if (unlikely(!sem->read_count))
|
||||
return -ENOMEM;
|
||||
|
||||
/* ->rw_sem represents the whole percpu_rw_semaphore for lockdep */
|
||||
rcu_sync_init(&sem->rss);
|
||||
__init_rwsem(&sem->rw_sem, name, rwsem_key);
|
||||
rcuwait_init(&sem->writer);
|
||||
sem->readers_block = 0;
|
||||
init_waitqueue_head(&sem->waiters);
|
||||
atomic_set(&sem->block, 0);
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
debug_check_no_locks_freed((void *)sem, sizeof(*sem));
|
||||
lockdep_init_map(&sem->dep_map, name, key, 0);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__percpu_init_rwsem);
|
||||
|
|
@ -41,73 +43,139 @@ void percpu_free_rwsem(struct percpu_rw_semaphore *sem)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(percpu_free_rwsem);
|
||||
|
||||
int __percpu_down_read(struct percpu_rw_semaphore *sem, int try)
|
||||
static bool __percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
__this_cpu_inc(*sem->read_count);
|
||||
|
||||
/*
|
||||
* Due to having preemption disabled the decrement happens on
|
||||
* the same CPU as the increment, avoiding the
|
||||
* increment-on-one-CPU-and-decrement-on-another problem.
|
||||
*
|
||||
* If the reader misses the writer's assignment of readers_block, then
|
||||
* the writer is guaranteed to see the reader's increment.
|
||||
* If the reader misses the writer's assignment of sem->block, then the
|
||||
* writer is guaranteed to see the reader's increment.
|
||||
*
|
||||
* Conversely, any readers that increment their sem->read_count after
|
||||
* the writer looks are guaranteed to see the readers_block value,
|
||||
* which in turn means that they are guaranteed to immediately
|
||||
* decrement their sem->read_count, so that it doesn't matter that the
|
||||
* writer missed them.
|
||||
* the writer looks are guaranteed to see the sem->block value, which
|
||||
* in turn means that they are guaranteed to immediately decrement
|
||||
* their sem->read_count, so that it doesn't matter that the writer
|
||||
* missed them.
|
||||
*/
|
||||
|
||||
smp_mb(); /* A matches D */
|
||||
|
||||
/*
|
||||
* If !readers_block the critical section starts here, matched by the
|
||||
* If !sem->block the critical section starts here, matched by the
|
||||
* release in percpu_up_write().
|
||||
*/
|
||||
if (likely(!smp_load_acquire(&sem->readers_block)))
|
||||
return 1;
|
||||
if (likely(!atomic_read_acquire(&sem->block)))
|
||||
return true;
|
||||
|
||||
/*
|
||||
* Per the above comment; we still have preemption disabled and
|
||||
* will thus decrement on the same CPU as we incremented.
|
||||
*/
|
||||
__percpu_up_read(sem);
|
||||
|
||||
if (try)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* We either call schedule() in the wait, or we'll fall through
|
||||
* and reschedule on the preempt_enable() in percpu_down_read().
|
||||
*/
|
||||
preempt_enable_no_resched();
|
||||
|
||||
/*
|
||||
* Avoid lockdep for the down/up_read() we already have them.
|
||||
*/
|
||||
__down_read(&sem->rw_sem);
|
||||
this_cpu_inc(*sem->read_count);
|
||||
__up_read(&sem->rw_sem);
|
||||
|
||||
preempt_disable();
|
||||
return 1;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__percpu_down_read);
|
||||
|
||||
void __percpu_up_read(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
smp_mb(); /* B matches C */
|
||||
/*
|
||||
* In other words, if they see our decrement (presumably to aggregate
|
||||
* zero, as that is the only time it matters) they will also see our
|
||||
* critical section.
|
||||
*/
|
||||
__this_cpu_dec(*sem->read_count);
|
||||
|
||||
/* Prod writer to recheck readers_active */
|
||||
/* Prod writer to re-evaluate readers_active_check() */
|
||||
rcuwait_wake_up(&sem->writer);
|
||||
|
||||
return false;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__percpu_up_read);
|
||||
|
||||
static inline bool __percpu_down_write_trylock(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
if (atomic_read(&sem->block))
|
||||
return false;
|
||||
|
||||
return atomic_xchg(&sem->block, 1) == 0;
|
||||
}
|
||||
|
||||
static bool __percpu_rwsem_trylock(struct percpu_rw_semaphore *sem, bool reader)
|
||||
{
|
||||
if (reader) {
|
||||
bool ret;
|
||||
|
||||
preempt_disable();
|
||||
ret = __percpu_down_read_trylock(sem);
|
||||
preempt_enable();
|
||||
|
||||
return ret;
|
||||
}
|
||||
return __percpu_down_write_trylock(sem);
|
||||
}
|
||||
|
||||
/*
|
||||
* The return value of wait_queue_entry::func means:
|
||||
*
|
||||
* <0 - error, wakeup is terminated and the error is returned
|
||||
* 0 - no wakeup, a next waiter is tried
|
||||
* >0 - woken, if EXCLUSIVE, counted towards @nr_exclusive.
|
||||
*
|
||||
* We use EXCLUSIVE for both readers and writers to preserve FIFO order,
|
||||
* and play games with the return value to allow waking multiple readers.
|
||||
*
|
||||
* Specifically, we wake readers until we've woken a single writer, or until a
|
||||
* trylock fails.
|
||||
*/
|
||||
static int percpu_rwsem_wake_function(struct wait_queue_entry *wq_entry,
|
||||
unsigned int mode, int wake_flags,
|
||||
void *key)
|
||||
{
|
||||
struct task_struct *p = get_task_struct(wq_entry->private);
|
||||
bool reader = wq_entry->flags & WQ_FLAG_CUSTOM;
|
||||
struct percpu_rw_semaphore *sem = key;
|
||||
|
||||
/* concurrent against percpu_down_write(), can get stolen */
|
||||
if (!__percpu_rwsem_trylock(sem, reader))
|
||||
return 1;
|
||||
|
||||
list_del_init(&wq_entry->entry);
|
||||
smp_store_release(&wq_entry->private, NULL);
|
||||
|
||||
wake_up_process(p);
|
||||
put_task_struct(p);
|
||||
|
||||
return !reader; /* wake (readers until) 1 writer */
|
||||
}
|
||||
|
||||
static void percpu_rwsem_wait(struct percpu_rw_semaphore *sem, bool reader)
|
||||
{
|
||||
DEFINE_WAIT_FUNC(wq_entry, percpu_rwsem_wake_function);
|
||||
bool wait;
|
||||
|
||||
spin_lock_irq(&sem->waiters.lock);
|
||||
/*
|
||||
* Serialize against the wakeup in percpu_up_write(), if we fail
|
||||
* the trylock, the wakeup must see us on the list.
|
||||
*/
|
||||
wait = !__percpu_rwsem_trylock(sem, reader);
|
||||
if (wait) {
|
||||
wq_entry.flags |= WQ_FLAG_EXCLUSIVE | reader * WQ_FLAG_CUSTOM;
|
||||
__add_wait_queue_entry_tail(&sem->waiters, &wq_entry);
|
||||
}
|
||||
spin_unlock_irq(&sem->waiters.lock);
|
||||
|
||||
while (wait) {
|
||||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
if (!smp_load_acquire(&wq_entry.private))
|
||||
break;
|
||||
schedule();
|
||||
}
|
||||
__set_current_state(TASK_RUNNING);
|
||||
}
|
||||
|
||||
bool __percpu_down_read(struct percpu_rw_semaphore *sem, bool try)
|
||||
{
|
||||
if (__percpu_down_read_trylock(sem))
|
||||
return true;
|
||||
|
||||
if (try)
|
||||
return false;
|
||||
|
||||
preempt_enable();
|
||||
percpu_rwsem_wait(sem, /* .reader = */ true);
|
||||
preempt_disable();
|
||||
|
||||
return true;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__percpu_down_read);
|
||||
|
||||
#define per_cpu_sum(var) \
|
||||
({ \
|
||||
|
|
@ -124,6 +192,8 @@ EXPORT_SYMBOL_GPL(__percpu_up_read);
|
|||
* zero. If this sum is zero, then it is stable due to the fact that if any
|
||||
* newly arriving readers increment a given counter, they will immediately
|
||||
* decrement that same counter.
|
||||
*
|
||||
* Assumes sem->block is set.
|
||||
*/
|
||||
static bool readers_active_check(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
|
|
@ -142,32 +212,36 @@ static bool readers_active_check(struct percpu_rw_semaphore *sem)
|
|||
|
||||
void percpu_down_write(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
might_sleep();
|
||||
rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);
|
||||
|
||||
/* Notify readers to take the slow path. */
|
||||
rcu_sync_enter(&sem->rss);
|
||||
|
||||
down_write(&sem->rw_sem);
|
||||
/*
|
||||
* Try set sem->block; this provides writer-writer exclusion.
|
||||
* Having sem->block set makes new readers block.
|
||||
*/
|
||||
if (!__percpu_down_write_trylock(sem))
|
||||
percpu_rwsem_wait(sem, /* .reader = */ false);
|
||||
|
||||
/* smp_mb() implied by __percpu_down_write_trylock() on success -- D matches A */
|
||||
|
||||
/*
|
||||
* Notify new readers to block; up until now, and thus throughout the
|
||||
* longish rcu_sync_enter() above, new readers could still come in.
|
||||
*/
|
||||
WRITE_ONCE(sem->readers_block, 1);
|
||||
|
||||
smp_mb(); /* D matches A */
|
||||
|
||||
/*
|
||||
* If they don't see our writer of readers_block, then we are
|
||||
* guaranteed to see their sem->read_count increment, and therefore
|
||||
* will wait for them.
|
||||
* If they don't see our store of sem->block, then we are guaranteed to
|
||||
* see their sem->read_count increment, and therefore will wait for
|
||||
* them.
|
||||
*/
|
||||
|
||||
/* Wait for all now active readers to complete. */
|
||||
rcuwait_wait_event(&sem->writer, readers_active_check(sem));
|
||||
/* Wait for all active readers to complete. */
|
||||
rcuwait_wait_event(&sem->writer, readers_active_check(sem), TASK_UNINTERRUPTIBLE);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(percpu_down_write);
|
||||
|
||||
void percpu_up_write(struct percpu_rw_semaphore *sem)
|
||||
{
|
||||
rwsem_release(&sem->dep_map, _RET_IP_);
|
||||
|
||||
/*
|
||||
* Signal the writer is done, no fast path yet.
|
||||
*
|
||||
|
|
@ -178,12 +252,12 @@ void percpu_up_write(struct percpu_rw_semaphore *sem)
|
|||
* Therefore we force it through the slow path which guarantees an
|
||||
* acquire and thereby guarantees the critical section's consistency.
|
||||
*/
|
||||
smp_store_release(&sem->readers_block, 0);
|
||||
atomic_set_release(&sem->block, 0);
|
||||
|
||||
/*
|
||||
* Release the write lock, this will allow readers back in the game.
|
||||
* Prod any pending reader/writer to make progress.
|
||||
*/
|
||||
up_write(&sem->rw_sem);
|
||||
__wake_up(&sem->waiters, TASK_NORMAL, 1, sem);
|
||||
|
||||
/*
|
||||
* Once this completes (at least one RCU-sched grace period hence) the
|
||||
|
|
|
|||
|
|
@ -28,7 +28,6 @@
|
|||
#include <linux/rwsem.h>
|
||||
#include <linux/atomic.h>
|
||||
|
||||
#include "rwsem.h"
|
||||
#include "lock_events.h"
|
||||
|
||||
/*
|
||||
|
|
@ -329,7 +328,7 @@ void __init_rwsem(struct rw_semaphore *sem, const char *name,
|
|||
* Make sure we are not reinitializing a held semaphore:
|
||||
*/
|
||||
debug_check_no_locks_freed((void *)sem, sizeof(*sem));
|
||||
lockdep_init_map(&sem->dep_map, name, key, 0);
|
||||
lockdep_init_map_wait(&sem->dep_map, name, key, 0, LD_WAIT_SLEEP);
|
||||
#endif
|
||||
#ifdef CONFIG_DEBUG_RWSEMS
|
||||
sem->magic = sem;
|
||||
|
|
@ -660,8 +659,6 @@ static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem,
|
|||
unsigned long flags;
|
||||
bool ret = true;
|
||||
|
||||
BUILD_BUG_ON(!(RWSEM_OWNER_UNKNOWN & RWSEM_NONSPINNABLE));
|
||||
|
||||
if (need_resched()) {
|
||||
lockevent_inc(rwsem_opt_fail);
|
||||
return false;
|
||||
|
|
@ -1338,7 +1335,7 @@ static struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem)
|
|||
/*
|
||||
* lock for reading
|
||||
*/
|
||||
inline void __down_read(struct rw_semaphore *sem)
|
||||
static inline void __down_read(struct rw_semaphore *sem)
|
||||
{
|
||||
if (!rwsem_read_trylock(sem)) {
|
||||
rwsem_down_read_slowpath(sem, TASK_UNINTERRUPTIBLE);
|
||||
|
|
@ -1426,7 +1423,7 @@ static inline int __down_write_trylock(struct rw_semaphore *sem)
|
|||
/*
|
||||
* unlock after reading
|
||||
*/
|
||||
inline void __up_read(struct rw_semaphore *sem)
|
||||
static inline void __up_read(struct rw_semaphore *sem)
|
||||
{
|
||||
long tmp;
|
||||
|
||||
|
|
|
|||
|
|
@ -1,10 +0,0 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef __INTERNAL_RWSEM_H
|
||||
#define __INTERNAL_RWSEM_H
|
||||
#include <linux/rwsem.h>
|
||||
|
||||
extern void __down_read(struct rw_semaphore *sem);
|
||||
extern void __up_read(struct rw_semaphore *sem);
|
||||
|
||||
#endif /* __INTERNAL_RWSEM_H */
|
||||
|
|
@ -14,14 +14,14 @@
|
|||
#include <linux/export.h>
|
||||
|
||||
void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
|
||||
struct lock_class_key *key)
|
||||
struct lock_class_key *key, short inner)
|
||||
{
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
/*
|
||||
* Make sure we are not reinitializing a held lock:
|
||||
*/
|
||||
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
|
||||
lockdep_init_map(&lock->dep_map, name, key, 0);
|
||||
lockdep_init_map_wait(&lock->dep_map, name, key, 0, inner);
|
||||
#endif
|
||||
lock->raw_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
|
||||
lock->magic = SPINLOCK_MAGIC;
|
||||
|
|
@ -39,7 +39,7 @@ void __rwlock_init(rwlock_t *lock, const char *name,
|
|||
* Make sure we are not reinitializing a held lock:
|
||||
*/
|
||||
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
|
||||
lockdep_init_map(&lock->dep_map, name, key, 0);
|
||||
lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_CONFIG);
|
||||
#endif
|
||||
lock->raw_lock = (arch_rwlock_t) __ARCH_RW_LOCK_UNLOCKED;
|
||||
lock->magic = RWLOCK_MAGIC;
|
||||
|
|
|
|||
|
|
@ -1124,6 +1124,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
|
|||
!rdp->rcu_iw_pending && rdp->rcu_iw_gp_seq != rnp->gp_seq &&
|
||||
(rnp->ffmask & rdp->grpmask)) {
|
||||
init_irq_work(&rdp->rcu_iw, rcu_iw_handler);
|
||||
atomic_set(&rdp->rcu_iw.flags, IRQ_WORK_HARD_IRQ);
|
||||
rdp->rcu_iw_pending = true;
|
||||
rdp->rcu_iw_gp_seq = rnp->gp_seq;
|
||||
irq_work_queue_on(&rdp->rcu_iw, rdp->cpu);
|
||||
|
|
|
|||
|
|
@ -239,18 +239,30 @@ core_initcall(rcu_set_runtime_mode);
|
|||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
static struct lock_class_key rcu_lock_key;
|
||||
struct lockdep_map rcu_lock_map =
|
||||
STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
|
||||
struct lockdep_map rcu_lock_map = {
|
||||
.name = "rcu_read_lock",
|
||||
.key = &rcu_lock_key,
|
||||
.wait_type_outer = LD_WAIT_FREE,
|
||||
.wait_type_inner = LD_WAIT_CONFIG, /* XXX PREEMPT_RCU ? */
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(rcu_lock_map);
|
||||
|
||||
static struct lock_class_key rcu_bh_lock_key;
|
||||
struct lockdep_map rcu_bh_lock_map =
|
||||
STATIC_LOCKDEP_MAP_INIT("rcu_read_lock_bh", &rcu_bh_lock_key);
|
||||
struct lockdep_map rcu_bh_lock_map = {
|
||||
.name = "rcu_read_lock_bh",
|
||||
.key = &rcu_bh_lock_key,
|
||||
.wait_type_outer = LD_WAIT_FREE,
|
||||
.wait_type_inner = LD_WAIT_CONFIG, /* PREEMPT_LOCK also makes BH preemptible */
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(rcu_bh_lock_map);
|
||||
|
||||
static struct lock_class_key rcu_sched_lock_key;
|
||||
struct lockdep_map rcu_sched_lock_map =
|
||||
STATIC_LOCKDEP_MAP_INIT("rcu_read_lock_sched", &rcu_sched_lock_key);
|
||||
struct lockdep_map rcu_sched_lock_map = {
|
||||
.name = "rcu_read_lock_sched",
|
||||
.key = &rcu_sched_lock_key,
|
||||
.wait_type_outer = LD_WAIT_FREE,
|
||||
.wait_type_inner = LD_WAIT_SPIN,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(rcu_sched_lock_map);
|
||||
|
||||
static struct lock_class_key rcu_callback_key;
|
||||
|
|
|
|||
|
|
@ -29,12 +29,12 @@ void complete(struct completion *x)
|
|||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&x->wait.lock, flags);
|
||||
raw_spin_lock_irqsave(&x->wait.lock, flags);
|
||||
|
||||
if (x->done != UINT_MAX)
|
||||
x->done++;
|
||||
__wake_up_locked(&x->wait, TASK_NORMAL, 1);
|
||||
spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
swake_up_locked(&x->wait);
|
||||
raw_spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL(complete);
|
||||
|
||||
|
|
@ -58,10 +58,12 @@ void complete_all(struct completion *x)
|
|||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&x->wait.lock, flags);
|
||||
lockdep_assert_RT_in_threaded_ctx();
|
||||
|
||||
raw_spin_lock_irqsave(&x->wait.lock, flags);
|
||||
x->done = UINT_MAX;
|
||||
__wake_up_locked(&x->wait, TASK_NORMAL, 0);
|
||||
spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
swake_up_all_locked(&x->wait);
|
||||
raw_spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL(complete_all);
|
||||
|
||||
|
|
@ -70,20 +72,20 @@ do_wait_for_common(struct completion *x,
|
|||
long (*action)(long), long timeout, int state)
|
||||
{
|
||||
if (!x->done) {
|
||||
DECLARE_WAITQUEUE(wait, current);
|
||||
DECLARE_SWAITQUEUE(wait);
|
||||
|
||||
__add_wait_queue_entry_tail_exclusive(&x->wait, &wait);
|
||||
do {
|
||||
if (signal_pending_state(state, current)) {
|
||||
timeout = -ERESTARTSYS;
|
||||
break;
|
||||
}
|
||||
__prepare_to_swait(&x->wait, &wait);
|
||||
__set_current_state(state);
|
||||
spin_unlock_irq(&x->wait.lock);
|
||||
raw_spin_unlock_irq(&x->wait.lock);
|
||||
timeout = action(timeout);
|
||||
spin_lock_irq(&x->wait.lock);
|
||||
raw_spin_lock_irq(&x->wait.lock);
|
||||
} while (!x->done && timeout);
|
||||
__remove_wait_queue(&x->wait, &wait);
|
||||
__finish_swait(&x->wait, &wait);
|
||||
if (!x->done)
|
||||
return timeout;
|
||||
}
|
||||
|
|
@ -100,9 +102,9 @@ __wait_for_common(struct completion *x,
|
|||
|
||||
complete_acquire(x);
|
||||
|
||||
spin_lock_irq(&x->wait.lock);
|
||||
raw_spin_lock_irq(&x->wait.lock);
|
||||
timeout = do_wait_for_common(x, action, timeout, state);
|
||||
spin_unlock_irq(&x->wait.lock);
|
||||
raw_spin_unlock_irq(&x->wait.lock);
|
||||
|
||||
complete_release(x);
|
||||
|
||||
|
|
@ -291,12 +293,12 @@ bool try_wait_for_completion(struct completion *x)
|
|||
if (!READ_ONCE(x->done))
|
||||
return false;
|
||||
|
||||
spin_lock_irqsave(&x->wait.lock, flags);
|
||||
raw_spin_lock_irqsave(&x->wait.lock, flags);
|
||||
if (!x->done)
|
||||
ret = false;
|
||||
else if (x->done != UINT_MAX)
|
||||
x->done--;
|
||||
spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
raw_spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(try_wait_for_completion);
|
||||
|
|
@ -322,8 +324,8 @@ bool completion_done(struct completion *x)
|
|||
* otherwise we can end up freeing the completion before complete()
|
||||
* is done referencing it.
|
||||
*/
|
||||
spin_lock_irqsave(&x->wait.lock, flags);
|
||||
spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
raw_spin_lock_irqsave(&x->wait.lock, flags);
|
||||
raw_spin_unlock_irqrestore(&x->wait.lock, flags);
|
||||
return true;
|
||||
}
|
||||
EXPORT_SYMBOL(completion_done);
|
||||
|
|
|
|||
|
|
@ -2492,3 +2492,6 @@ static inline bool is_per_cpu_kthread(struct task_struct *p)
|
|||
return true;
|
||||
}
|
||||
#endif
|
||||
|
||||
void swake_up_all_locked(struct swait_queue_head *q);
|
||||
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
|
||||
|
|
|
|||
|
|
@ -32,6 +32,19 @@ void swake_up_locked(struct swait_queue_head *q)
|
|||
}
|
||||
EXPORT_SYMBOL(swake_up_locked);
|
||||
|
||||
/*
|
||||
* Wake up all waiters. This is an interface which is solely exposed for
|
||||
* completions and not for general usage.
|
||||
*
|
||||
* It is intentionally different from swake_up_all() to allow usage from
|
||||
* hard interrupt context and interrupt disabled regions.
|
||||
*/
|
||||
void swake_up_all_locked(struct swait_queue_head *q)
|
||||
{
|
||||
while (!list_empty(&q->task_list))
|
||||
swake_up_locked(q);
|
||||
}
|
||||
|
||||
void swake_up_one(struct swait_queue_head *q)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
|
@ -69,7 +82,7 @@ void swake_up_all(struct swait_queue_head *q)
|
|||
}
|
||||
EXPORT_SYMBOL(swake_up_all);
|
||||
|
||||
static void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
||||
void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
|
||||
{
|
||||
wait->task = current;
|
||||
if (list_empty(&wait->task_list))
|
||||
|
|
|
|||
|
|
@ -1404,7 +1404,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
|
|||
base = softtimer ? HRTIMER_MAX_CLOCK_BASES / 2 : 0;
|
||||
base += hrtimer_clockid_to_base(clock_id);
|
||||
timer->is_soft = softtimer;
|
||||
timer->is_hard = !softtimer;
|
||||
timer->is_hard = !!(mode & HRTIMER_MODE_HARD);
|
||||
timer->base = &cpu_base->clock_base[base];
|
||||
timerqueue_init(&timer->node);
|
||||
}
|
||||
|
|
@ -1514,7 +1514,11 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
|
|||
*/
|
||||
raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
|
||||
trace_hrtimer_expire_entry(timer, now);
|
||||
lockdep_hrtimer_enter(timer);
|
||||
|
||||
restart = fn(timer);
|
||||
|
||||
lockdep_hrtimer_exit(timer);
|
||||
trace_hrtimer_expire_exit(timer);
|
||||
raw_spin_lock_irq(&cpu_base->lock);
|
||||
|
||||
|
|
|
|||
|
|
@ -58,7 +58,8 @@ static struct clocksource clocksource_jiffies = {
|
|||
.max_cycles = 10,
|
||||
};
|
||||
|
||||
__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock);
|
||||
__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);
|
||||
__cacheline_aligned_in_smp seqcount_t jiffies_seq;
|
||||
|
||||
#if (BITS_PER_LONG < 64)
|
||||
u64 get_jiffies_64(void)
|
||||
|
|
@ -67,9 +68,9 @@ u64 get_jiffies_64(void)
|
|||
u64 ret;
|
||||
|
||||
do {
|
||||
seq = read_seqbegin(&jiffies_lock);
|
||||
seq = read_seqcount_begin(&jiffies_seq);
|
||||
ret = jiffies_64;
|
||||
} while (read_seqretry(&jiffies_lock, seq));
|
||||
} while (read_seqcount_retry(&jiffies_seq, seq));
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(get_jiffies_64);
|
||||
|
|
|
|||
|
|
@ -1126,8 +1126,11 @@ void run_posix_cpu_timers(void)
|
|||
if (!fastpath_timer_check(tsk))
|
||||
return;
|
||||
|
||||
if (!lock_task_sighand(tsk, &flags))
|
||||
lockdep_posixtimer_enter();
|
||||
if (!lock_task_sighand(tsk, &flags)) {
|
||||
lockdep_posixtimer_exit();
|
||||
return;
|
||||
}
|
||||
/*
|
||||
* Here we take off tsk->signal->cpu_timers[N] and
|
||||
* tsk->cpu_timers[N] all the timers that are firing, and
|
||||
|
|
@ -1169,6 +1172,7 @@ void run_posix_cpu_timers(void)
|
|||
cpu_timer_fire(timer);
|
||||
spin_unlock(&timer->it_lock);
|
||||
}
|
||||
lockdep_posixtimer_exit();
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -84,13 +84,15 @@ int tick_is_oneshot_available(void)
|
|||
static void tick_periodic(int cpu)
|
||||
{
|
||||
if (tick_do_timer_cpu == cpu) {
|
||||
write_seqlock(&jiffies_lock);
|
||||
raw_spin_lock(&jiffies_lock);
|
||||
write_seqcount_begin(&jiffies_seq);
|
||||
|
||||
/* Keep track of the next tick event */
|
||||
tick_next_period = ktime_add(tick_next_period, tick_period);
|
||||
|
||||
do_timer(1);
|
||||
write_sequnlock(&jiffies_lock);
|
||||
write_seqcount_end(&jiffies_seq);
|
||||
raw_spin_unlock(&jiffies_lock);
|
||||
update_wall_time();
|
||||
}
|
||||
|
||||
|
|
@ -162,9 +164,9 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
|
|||
ktime_t next;
|
||||
|
||||
do {
|
||||
seq = read_seqbegin(&jiffies_lock);
|
||||
seq = read_seqcount_begin(&jiffies_seq);
|
||||
next = tick_next_period;
|
||||
} while (read_seqretry(&jiffies_lock, seq));
|
||||
} while (read_seqcount_retry(&jiffies_seq, seq));
|
||||
|
||||
clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT);
|
||||
|
||||
|
|
|
|||
|
|
@ -65,7 +65,8 @@ static void tick_do_update_jiffies64(ktime_t now)
|
|||
return;
|
||||
|
||||
/* Reevaluate with jiffies_lock held */
|
||||
write_seqlock(&jiffies_lock);
|
||||
raw_spin_lock(&jiffies_lock);
|
||||
write_seqcount_begin(&jiffies_seq);
|
||||
|
||||
delta = ktime_sub(now, last_jiffies_update);
|
||||
if (delta >= tick_period) {
|
||||
|
|
@ -91,10 +92,12 @@ static void tick_do_update_jiffies64(ktime_t now)
|
|||
/* Keep the tick_next_period variable up to date */
|
||||
tick_next_period = ktime_add(last_jiffies_update, tick_period);
|
||||
} else {
|
||||
write_sequnlock(&jiffies_lock);
|
||||
write_seqcount_end(&jiffies_seq);
|
||||
raw_spin_unlock(&jiffies_lock);
|
||||
return;
|
||||
}
|
||||
write_sequnlock(&jiffies_lock);
|
||||
write_seqcount_end(&jiffies_seq);
|
||||
raw_spin_unlock(&jiffies_lock);
|
||||
update_wall_time();
|
||||
}
|
||||
|
||||
|
|
@ -105,12 +108,14 @@ static ktime_t tick_init_jiffy_update(void)
|
|||
{
|
||||
ktime_t period;
|
||||
|
||||
write_seqlock(&jiffies_lock);
|
||||
raw_spin_lock(&jiffies_lock);
|
||||
write_seqcount_begin(&jiffies_seq);
|
||||
/* Did we start the jiffies update yet ? */
|
||||
if (last_jiffies_update == 0)
|
||||
last_jiffies_update = tick_next_period;
|
||||
period = last_jiffies_update;
|
||||
write_sequnlock(&jiffies_lock);
|
||||
write_seqcount_end(&jiffies_seq);
|
||||
raw_spin_unlock(&jiffies_lock);
|
||||
return period;
|
||||
}
|
||||
|
||||
|
|
@ -240,6 +245,7 @@ static void nohz_full_kick_func(struct irq_work *work)
|
|||
|
||||
static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
|
||||
.func = nohz_full_kick_func,
|
||||
.flags = ATOMIC_INIT(IRQ_WORK_HARD_IRQ),
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -676,10 +682,10 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
|
|||
|
||||
/* Read jiffies and the time when jiffies were updated last */
|
||||
do {
|
||||
seq = read_seqbegin(&jiffies_lock);
|
||||
seq = read_seqcount_begin(&jiffies_seq);
|
||||
basemono = last_jiffies_update;
|
||||
basejiff = jiffies;
|
||||
} while (read_seqretry(&jiffies_lock, seq));
|
||||
} while (read_seqcount_retry(&jiffies_seq, seq));
|
||||
ts->last_jiffies = basejiff;
|
||||
ts->timer_expires_base = basemono;
|
||||
|
||||
|
|
|
|||
|
|
@ -2397,8 +2397,10 @@ EXPORT_SYMBOL(hardpps);
|
|||
*/
|
||||
void xtime_update(unsigned long ticks)
|
||||
{
|
||||
write_seqlock(&jiffies_lock);
|
||||
raw_spin_lock(&jiffies_lock);
|
||||
write_seqcount_begin(&jiffies_seq);
|
||||
do_timer(ticks);
|
||||
write_sequnlock(&jiffies_lock);
|
||||
write_seqcount_end(&jiffies_seq);
|
||||
raw_spin_unlock(&jiffies_lock);
|
||||
update_wall_time();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -25,7 +25,8 @@ static inline void sched_clock_resume(void) { }
|
|||
extern void do_timer(unsigned long ticks);
|
||||
extern void update_wall_time(void);
|
||||
|
||||
extern seqlock_t jiffies_lock;
|
||||
extern raw_spinlock_t jiffies_lock;
|
||||
extern seqcount_t jiffies_seq;
|
||||
|
||||
#define CS_NAME_LEN 32
|
||||
|
||||
|
|
|
|||
|
|
@ -1086,6 +1086,23 @@ config PROVE_LOCKING
|
|||
|
||||
For more details, see Documentation/locking/lockdep-design.rst.
|
||||
|
||||
config PROVE_RAW_LOCK_NESTING
|
||||
bool "Enable raw_spinlock - spinlock nesting checks"
|
||||
depends on PROVE_LOCKING
|
||||
default n
|
||||
help
|
||||
Enable the raw_spinlock vs. spinlock nesting checks which ensure
|
||||
that the lock nesting rules for PREEMPT_RT enabled kernels are
|
||||
not violated.
|
||||
|
||||
NOTE: There are known nesting problems. So if you enable this
|
||||
option expect lockdep splats until these problems have been fully
|
||||
addressed which is work in progress. This config switch allows to
|
||||
identify and analyze these problems. It will be removed and the
|
||||
check permanentely enabled once the main issues have been fixed.
|
||||
|
||||
If unsure, select N.
|
||||
|
||||
config LOCK_STAT
|
||||
bool "Lock usage statistics"
|
||||
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
|
||||
|
|
|
|||
|
|
@ -488,6 +488,7 @@ static const char *uaccess_safe_builtin[] = {
|
|||
"__sanitizer_cov_trace_cmp2",
|
||||
"__sanitizer_cov_trace_cmp4",
|
||||
"__sanitizer_cov_trace_cmp8",
|
||||
"__sanitizer_cov_trace_switch",
|
||||
/* UBSAN */
|
||||
"ubsan_type_mismatch_common",
|
||||
"__ubsan_handle_type_mismatch",
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user