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lockdep: Always inline lockdep_{off,on}()

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These functions are called {early,late} in nmi_{enter,exit} and should
not be traced or probed. They are also puny, so 'inline' them.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200505134101.048523500@linutronix.de
This commit is contained in:
Peter Zijlstra 2020-02-24 22:14:51 +01:00 committed by Thomas Gleixner
parent 69ea03b56e
commit e616cb8daa
2 changed files with 21 additions and 21 deletions
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23
include/linux/lockdep.h
View File

@ -308,8 +308,27 @@ extern void lockdep_set_selftest_task(struct task_struct *task);
extern void lockdep_init_task(struct task_struct *task);
extern void lockdep_off(void);
extern void lockdep_on(void);
/*
* Split the recrursion counter in two to readily detect 'off' vs recursion.
*/
#define LOCKDEP_RECURSION_BITS 16
#define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
#define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)
/*
* lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
* to header dependencies.
*/
#define lockdep_off() \
do { \
current->lockdep_recursion += LOCKDEP_OFF; \
} while (0)
#define lockdep_on() \
do { \
current->lockdep_recursion -= LOCKDEP_OFF; \
} while (0)
extern void lockdep_register_key(struct lock_class_key *key);
extern void lockdep_unregister_key(struct lock_class_key *key);

19
kernel/locking/lockdep.c
View File

@ -393,25 +393,6 @@ void lockdep_init_task(struct task_struct *task)
task->lockdep_recursion = 0;
}
/*
* Split the recrursion counter in two to readily detect 'off' vs recursion.
*/
#define LOCKDEP_RECURSION_BITS 16
#define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
#define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)
void lockdep_off(void)
{
current->lockdep_recursion += LOCKDEP_OFF;
}
EXPORT_SYMBOL(lockdep_off);
void lockdep_on(void)
{
current->lockdep_recursion -= LOCKDEP_OFF;
}
EXPORT_SYMBOL(lockdep_on);
static inline void lockdep_recursion_finish(void)
{
if (WARN_ON_ONCE(--current->lockdep_recursion))