This is a standalone version of VMware Balloon driver. Ballooning is a
technique that allows hypervisor dynamically limit the amount of memory
available to the guest (with guest cooperation). In the overcommit
scenario, when hypervisor set detects that it needs to shuffle some
memory, it instructs the driver to allocate certain number of pages, and
the underlying memory gets returned to the hypervisor. Later hypervisor
may return memory to the guest by reattaching memory to the pageframes and
instructing the driver to "deflate" balloon.
We are submitting a standalone driver because KVM maintainer (Avi Kivity)
expressed opinion (rightly) that our transport does not fit well into
virtqueue paradigm and thus it does not make much sense to integrate with
virtio.
There were also some concerns whether current ballooning technique is the
right thing. If there appears a better framework to achieve this we are
prepared to evaluate and switch to using it, but in the meantime we'd like
to get this driver upstream.
We want to get the driver accepted in distributions so that users do not
have to deal with an out-of-tree module and many distributions have
"upstream first" requirement.
The driver has been shipping for a number of years and users running on
VMware platform will have it installed as part of VMware Tools even if it
will not come from a distribution, thus there should not be additional
risk in pulling the driver into mainline. The driver will only activate
if host is VMware so everyone else should not be affected at all.
Signed-off-by: Dmitry Torokhov <dtor@vmware.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Atom erratum AAE44/AAF40/AAG38/AAH41:
"If software clears the PS (page size) bit in a present PDE (page
directory entry), that will cause linear addresses mapped through this
PDE to use 4-KByte pages instead of using a large page after old TLB
entries are invalidated. Due to this erratum, if a code fetch uses
this PDE before the TLB entry for the large page is invalidated then
it may fetch from a different physical address than specified by
either the old large page translation or the new 4-KByte page
translation. This erratum may also cause speculative code fetches from
incorrect addresses."
[http://download.intel.com/design/processor/specupdt/319536.pdf]
Where as commit 211b3d03c7 seems to
workaround errata AAH41 (mixed 4K TLBs) it reduces the window of
opportunity for the bug to occur and does not totally remove it. This
patch disables mixed 4K/4MB page tables totally avoiding the page
splitting and not tripping this processor issue.
This is based on an original patch by Colin King.
Originally-by: Colin Ian King <colin.king@canonical.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <1269271251-19775-1-git-send-email-colin.king@canonical.com>
Cc: <stable@kernel.org>
When we do a thread switch, we clear the outgoing FS/GS base if the
corresponding selector is nonzero. This is taken by __switch_to() as
an entry invariant; it does not verify that it is true on entry.
However, copy_thread() doesn't enforce this constraint, which can
result in inconsistent results after fork().
Make copy_thread() match the behavior of __switch_to().
Reported-and-tested-by: Samuel Thibault <samuel.thibault@inria.fr>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <4BD1E061.8030605@zytor.com>
Cc: <stable@kernel.org>
They are not needed and add over 512 bytes to kernel data.
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Old code from original patch contains beagle board pins that are
not available on the Devkit8000.
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Change position of calling serial and ethernet initialization.
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Devkit8000 uses the CUS package for OMAP3530.
This patch adds missing package selection for CUS and enables
CONFIG_MUX.
Replace whitespace with tab in Kconfig.
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
arch/arm/configs/n8x0_defconfig:1061:warning: override: reassigning to
symbol NILFS2_FS
Signed-off-by: Francisco Alecrim <francisco.alecrim@openbossa.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Corrected type of flash in output (OneNAND => NOR).
Removed whitespace after newline in output.
Removed double whitespace in output.
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Modern udev will not work with the CONFIG_SYSFS_DEPRECATED*=y options and
it seems also that the Maemo release works without when testing with the
Maemo 2.6.28 kernel.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Phonet is enabled by the commit bce54fed94
and this duplicate gives a warning when doing make rx51_defconfig.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
If gpmc_t isn't given, we don't need to set timing for gpmc, or it will cause
a Oops.
Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The initialize of i2c subsystem will set pinmux, so it should be done
after the initialize of mux subsystem initialization.
Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
INT_34XX_BENCH_MPU_EMUL was defined twice, another is at Line 312.
Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
If CONFIG_MTD_NAND_OMAP2 is not enabled, there will be a compile error,
"gpmc_nand_init() is not defined". Add a inline noop function to fix it.
Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Change the name for the spi instances on omap44xx_clks to match
the names omap2 spi driver gives:
omap-mcspi.1 -> omap2_mcspi.1
omap-mcspi.2 -> omap2_mcspi.2
omap-mcspi.3 -> omap2_mcspi.3
omap-mcspi.4 -> omap2_mcspi.4
Signed-off-by: Abraham Arce <x0066660@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Disable the nonexistent ehci port on Devkit8000.
Signed-off-by: Thomas Weber <weber@corscience.de>
Acked-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This patch fixes the base address of CONTROL register on OMAP4430SDP.
The control base is used by peripherals like MMC1 for PBIAS configuration.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
IGEP v2 uses EHCI port 1 instead of EHCI port 2.
Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Fix warning: 'return' with a value, in function returning void
in n8x0_mmc_init. Also fix a search and replace typo.
Signed-off-by: Tony Lindgren <tony@atomide.com>
The value to check is 7 for V6 instead. The code has been
working as it falls through to 24xx code if the other checks
fail.
Signed-off-by: Tony Lindgren <tony@atomide.com>
The register DMA4_CDAC needs to be initialized to zero
before starting DMA transfer.
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Govindraj R <govindraj.raja@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Reported-by:S, Venkatraman <svenkatr@ti.com>
Signed-off-by: Manjunatha GK <manjugk@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Since IRQ_TYPE_EDGE_BOTH is defined as (IRQ_TYPE_EDGE_FALLING |
IRQ_TYPE_EDGE_RISING), testing against it with a bitwise AND also matches
both single-edge cases in addition to the intended both edges case. Fix it,
replacing with a more accurate expression.
Created and tested againts linux-2.6.34-rc3.
Applicable to 2.6.33-stable as well.
Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>
When the 32k sync timer is used for sched_clock(), it should count
time from the kernel boot (clocksource init) instead of the last HW
reset. Otherwise printk.time values will jump suddenly during the boot:
[ 0.000000] calling omap2_clk_arch_init+0x0/0x138 @ 1
[ 0.000000] initcall omap2_clk_arch_init+0x0/0x138 returned -22 after 0 usecs
[ 0.000000] initcall omap2_clk_arch_init+0x0/0x138 returned with error code -22
[ 0.000000] calling omap_init_clocksource_32k+0x0/0x98 @ 1
[ 508.697937] initcall omap_init_clocksource_32k+0x0/0x98 returned 0 after 0 usecs
[ 508.697967] calling omap_init_devices+0x0/0x38 @ 1
[ 508.698425] initcall omap_init_devices+0x0/0x38 returned 0 after 0 usecs
This will confuse tools such as scripts/bootgraph.pl.
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This adds support for Memory24, Memory32, and Memory32Fixed descriptors in
PCI host bridge _CRS.
I experimentally determined that Windows (2008 R2) accepts these descriptors
and treats them as windows that are forwarded to the PCI bus, e.g., if
it finds any PCI devices with BARs outside the windows, it moves them into
the windows.
I don't know whether any machines actually use these descriptors in PCI
host bridge _CRS methods, but if any exist and they're new enough that we
automatically turn on "pci=use_crs", they will work with Windows but not
with Linux.
Here are the details: https://bugzilla.kernel.org/show_bug.cgi?id=15817
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Commit "timekeeping: Fix clock_gettime vsyscall time warp" (0696b711e)
introduced the new parameter "mult" to update_vsyscall(). This parameter
contains the internal NTP adjusted clock multiplier.
The s390x vdso did not use this adjusted multiplier. Instead, it used
the constant clock multiplier for gettimeofday() and clock_gettime()
variants. This may result in observable time warps as explained in
commit 0696b711e.
Make the NTP adjusted clock multiplier available to the s390x vdso
implementation and use it for time calculations.
Cc: <stable@kernel.org>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Reenable multiple subchannel sets after hibernation,
prior to the device callbacks.
Cc: <stable@kernel.org>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
update bcmring_defconfig to the latest kernel version, this will fix the
KAutobuild error.
Signed-off-by: Leo Hao Chen <leochen@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
m68knommu: allow 4 coldfire serial ports
m68knommu: fix coldfire tcdrain
m68knommu: remove a duplicate vector setting line for 68360
Fix m68k-uclinux's rt_sigreturn trampoline
m68knommu: correct the CC flags for Coldfire M5272 targets
uclinux: error message when FLAT reloc symbol is invalid, v2
* 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: Fix TSS size check for 16-bit tasks
KVM: Add missing srcu_read_lock() for kvm_mmu_notifier_release()
KVM: Increase NR_IOBUS_DEVS limit to 200
KVM: fix the handling of dirty bitmaps to avoid overflows
KVM: MMU: fix kvm_mmu_zap_page() and its calling path
KVM: VMX: Save/restore rflags.vm correctly in real mode
KVM: allow bit 10 to be cleared in MSR_IA32_MC4_CTL
KVM: Don't spam kernel log when injecting exceptions due to bad cr writes
KVM: SVM: Fix memory leaks that happen when svm_create_vcpu() fails
KVM: take srcu lock before call to complete_pio()
A 16-bit TSS is only 44 bytes long. So make sure to test for the correct
size on task switch.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
/tmp/ccJ3ssZW.s: Assembler messages:
/tmp/ccJ3ssZW.s:1952: Error: can't resolve `.text' {.text section} - `.LFB1077'
This is caused because:
.section .data
.section .text
.section .text
.previous
does not return us to the .text section, but the .data section; this
makes use of .previous dangerous if the ordering of previous sections
is not known.
Fix up the other users of .previous; .pushsection and .popsection are
a safer pairing to use than .section and .previous.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Fix tcdrain on coldfire uarts.
Currently with coldfire uarts tcdrain returns without waiting for txempty,
because (tx)fifosize is 0. Fix that and call uart_update_timeout when
setting the baud rate, otherwise tcdrain will wait for an half our :)
Also constify mcf_uart_ops.
Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Remove a duplicate vector setting line for the 68360 interrupt
setup. Pointed out by Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
APB timer is used on Moorestown platforms but not on a standard PC.
If APB timer code is compiled in but not initialized at run-time due
to lack of FW reported SFI table, kernel would panic when the non-boot
CPUs are offlined and notifier is called.
https://bugzilla.kernel.org/show_bug.cgi?id=15786
This patch ensures CPU hotplug notifier for APB timer is only registered
when the APBT timer block is initialized.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1271701423-1162-1-git-send-email-jacob.jun.pan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Before commit e28cbf2293 ("improve
sys_newuname() for compat architectures") 64-bit x86 had a private
implementation of sys_uname which was just called sys_uname, which other
architectures used for the old uname.
Due to some merge issues with the uname refactoring patches we ended up
calling the old uname version for both the old and new system call
slots, which lead to the domainname filed never be set which caused
failures with libnss_nis.
Reported-and-tested-by: Andy Isaacson <adi@hexapodia.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Int is not long enough to store the size of a dirty bitmap.
This patch fixes this problem with the introduction of a wrapper
function to calculate the sizes of dirty bitmaps.
Note: in mark_page_dirty(), we have to consider the fact that
__set_bit() takes the offset as int, not long.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Currently we set eflags.vm unconditionally when entering real mode emulation
through virtual-8086 mode, and clear it unconditionally when we enter protected
mode. The means that the following sequence
KVM_SET_REGS (rflags.vm=1)
KVM_SET_SREGS (cr0.pe=1)
Ends up with rflags.vm clear due to KVM_SET_SREGS triggering enter_pmode().
Fix by shadowing rflags.vm (and rflags.iopl) correctly while in real mode:
reads and writes to those bits access a shadow register instead of the actual
register.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
There is a quirk for AMD K8 CPUs in many Linux kernels (see
arch/x86/kernel/cpu/mcheck/mce.c:__mcheck_cpu_apply_quirks()) that
clears bit 10 in that MCE related MSR. KVM can only cope with all
zeros or all ones, so it will inject a #GP into the guest, which
will let it panic.
So lets add a quirk to the quirk and ignore this single cleared bit.
This fixes -cpu kvm64 on all machines and -cpu host on K8 machines
with some guest Linux kernels.
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
svm_create_vcpu() does not free the pages allocated during the creation
when it fails to complete the allocations. This patch fixes it.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
complete_pio() may use slot table which is protected by srcu.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
We can overflow the hardirq stack if we set the %pil here
so early, just let the normal control flow do it.
This is fine as we are allowed to do the actual IRQ enable
at any point after we call trace_hardirqs_on.
Signed-off-by: David S. Miller <davem@davemloft.net>
a recent fc11 udev update on an 83xx board made root console login
disappear:
Updating : udev-141-8.fc11.ppc 32/83
udev: starting version 141
udev: deprecated sysfs layout; update the kernel or disable CONFIG_SYSFS_DEPRECATED;
some udev features will not work correctly
and sure enough, turning off SYSFS_DEPRECATED brings the login prompt back.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
to enable the storage controller on earlier rev. mpc834x itx boards.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
83xx users looking to run apache will experience this error:
/var/log/apache2/error.log:
[emerg] (38)Function not implemented: Couldn't create pollset in child; check system or user limits
enabling CONFIG_EPOLL in kernel config fixes this so apache can run.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Some board setup functions call cpm1_clk_setup() or cmp2_clk_setup()
to configure the clock source.
If CPM_CLK_RTX has been used for the parameter mode,
the clock has been configured only for TX but not for RX.
With this patch CPM_CLK_RTX configures the clock for both directions
correctly.
Signed-off-by: Wolfgang Ocker <weo@reccoware.de>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
The code was looking for this in cpu_features, not mmu_features. Fix this.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Currently some MPC85xx and MPC86xx boards fail to build without
CONFIG_PCI:
arch/powerpc/platforms/fsl_uli1575.c: In function 'quirk_final_uli5249':
arch/powerpc/platforms/fsl_uli1575.c:234: error: implicit declaration of function 'pci_bus_for_each_resource'
arch/powerpc/platforms/fsl_uli1575.c:234: error: expected ';' before '{' token
cc1: warnings being treated as errors
arch/powerpc/platforms/fsl_uli1575.c:223: warning: unused variable 'dummy'
make[1]: *** [arch/powerpc/platforms/fsl_uli1575.o] Error 1
This patch fixes the issue by appending 'if PCI' condition when
selecting FSL_ULI1575 Kconfig symbol.
Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
* master.kernel.org:/home/rmk/linux-2.6-arm:
ARM: 5974/1: arm/mach-at91 Makefile: remove two blanks.
ARM: 6052/1: kdump: make kexec work in interrupt context
ARM: 6051/1: VFP: preserve the HW context when calling signal handlers
ARM: 6050/1: VFP: fix the SMP versions of vfp_{sync,flush}_hwstate
ARM: 6007/1: fix highmem with VIPT cache and DMA
ARM: 5975/1: AT91 slow-clock suspend: don't wait when turning PLLs off
We now have to to include linux/slab.h explicitly for kmalloc &
friends. Files that build against host headers already get their
prototypes via um_malloc.h, linux/slab.h may even be unavailable.
Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
lguest: stop using KVM hypercall mechanism
lguest: workaround cmpxchg8b_emu by ignoring cli in the guest.
Recently, we started seeing this on allmodconfig builds:
CC mm/memcontrol.o
{standard input}: Assembler messages:
{standard input}:4076: Error: operands mismatch -- statement `subl 12(%fp),170(%a0)' ignored
Correct the asm constraint, like done for m68knommu.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
LibSegFault uses piggybacks sc_fpstate field of the `struct sigcontext'
and this patch avoids LibSegFault overflowing this field. Also this
removes an unnecessary divergence from classic m68k.
Signed-off-by: Maxim Kuvyrkov <maxim@codesourcery.com>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This is a partial revert of 4cd8b5e2a1 "lguest: use KVM hypercalls";
we revert to using (just as questionable but more reliable) int $15 for
hypercalls. I didn't revert the register mapping, so we still use the
same calling convention as kvm.
KVM in more recent incarnations stopped injecting a fault when a guest
tried to use the VMCALL instruction from ring 1, so lguest under kvm
fails to make hypercalls. It was nice to share code with our KVM
cousins, but this was overreach.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Matias Zabaljauregui <zabaljauregui@gmail.com>
Cc: Avi Kivity <avi@redhat.com>
Cosmetic change to mach-at91 Makefile: remove two blanks introduced
by earlier patches.
Signed-off-by: Ernst Schwab <eschwab@online.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
When crash happens in interrupt context there is no userspace context.
We always use current->active_mm in those cases.
Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
From: Imre Deak <imre.deak@nokia.com>
Signal handlers can use floating point, so prevent them to corrupt
the main thread's VFP context. So far there were two signal stack
frame formats defined based on the VFP implementation, but the user
struct used for ptrace covers all posibilities, so use it for the
signal stack too.
Introduce also a new user struct for VFP exception registers. In
this too fields not relevant to the current VFP architecture are
ignored.
Support to save / restore the exception registers was added by
Will Deacon.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
From: Imre Deak <imre.deak@nokia.com>
Recently the UP versions of these functions were refactored and as
a side effect it became possible to call them for the current thread.
This isn't true for the SMP versions however, so fix this up.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
The VIVT cache of a highmem page is always flushed before the page
is unmapped. This cache flush is explicit through flush_cache_kmaps()
in flush_all_zero_pkmaps(), or through __cpuc_flush_dcache_area() in
kunmap_atomic(). There is also an implicit flush of those highmem pages
that were part of a process that just terminated making those pages free
as the whole VIVT cache has to be flushed on every task switch. Hence
unmapped highmem pages need no cache maintenance in that case.
However unmapped pages may still be cached with a VIPT cache because the
cache is tagged with physical addresses. There is no need for a whole
cache flush during task switching for that reason, and despite the
explicit cache flushes in flush_all_zero_pkmaps() and kunmap_atomic(),
some highmem pages that were mapped in user space end up still cached
even when they become unmapped.
So, we do have to perform cache maintenance on those unmapped highmem
pages in the context of DMA when using a VIPT cache. Unfortunately,
it is not possible to perform that cache maintenance using physical
addresses as all the L1 cache maintenance coprocessor functions accept
virtual addresses only. Therefore we have no choice but to set up a
temporary virtual mapping for that purpose.
And of course the explicit cache flushing when unmapping a highmem page
on a system with a VIPT cache now can go, which should increase
performance.
While at it, because the code in __flush_dcache_page() has to be modified
anyway, let's also make sure the mapped highmem pages are pinned with
kmap_high_get() for the duration of the cache maintenance operation.
Because kunmap() does unmap highmem pages lazily, it was reported by
Gary King <GKing@nvidia.com> that those pages ended up being unmapped
during cache maintenance on SMP causing segmentation faults.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
From: Julien Langer <julien.langer@gmail.com>
AT91: when turning off the PLLs during suspend, don't wait for the lock
flag to be set. Previously the code would always run into the loop
limitation of 1000 iterations because the flag is never set when turning
the PLLs off.
Comments from Anders Larsen:
(in http://marc.info/?l=linux-kernel&m=127058929724193&w=2)
Signed-off-by: Julien Langer <julien.langer@gmail.com>
Signed-off-by: Anders Larsen <al@alarsen.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
128 bytes is sufficient for the register window save area, but the
calling conventions allow the callee to save up to 6 incoming argument
registers into the stack frame after the register window save area.
This means a minimal stack frame is 176 bytes (128 + (6 * 8)).
This fixes random crashes when using the function tracer.
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix forgotten kmemleak headers inclusion for kmemleak_not_leak()
declaration.
This fixes the following build error:
arch/sparc/kernel/irq_64.c: In function ‘sun4v_build_virq’:
arch/sparc/kernel/irq_64.c:657: error: implicit declaration of function ‘kmemleak_not_leak’
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Found by kmemleak.
If request_resource() fails, we leak the struct resource we
allocated to represent the IOMMU mapping area.
This actually happens on sun4v machines because the IOMEM area is only
reported sans the IOMMU region, unlike all previous systems. I'll
need to fix that at some point, but for now fix the leak.
Signed-off-by: David S. Miller <davem@davemloft.net>
The only reference we store to this memory is in the form of a
physical address, so kmemleak can't see it.
Add a kmemleak_not_leak() annotation.
It's probably useful to be able to look at a dump of these things
either via debugfs or similar, and thus we could at some point store
them in some kind of table and therefore get rid of this annotation.
Signed-off-by: David S. Miller <davem@davemloft.net>
It's the only way we'll be able to implement the function
graph tracer properly.
A positive is that we no longer have to worry about the
linker over-optimizing the tail call, since we don't
use a tail call any more.
Signed-off-by: David S. Miller <davem@davemloft.net>
This keeps us from having to use kstat_irqs_cpu() from the NMI handler,
the former of which is a profiled function.
Instead we use a currently empty slot in the cpu_data
Signed-off-by: David S. Miller <davem@davemloft.net>
These include the timer implementation, perf events support, and the
performance counter register (pcr) programming layer.
Signed-off-by: David S. Miller <davem@davemloft.net>
Check function_trace_stop at ftrace_caller
Toss mcount_call and dummy call of ftrace_stub, unnecessary.
Document problems we'll have if the final kernel image link
ever turns on relaxation.
Properly size 'ftrace_call' so it looks right when inspecting
instructions under gdb et al.
Signed-off-by: David S. Miller <davem@davemloft.net>
If we are in an NMI then doing a plain raw_local_irq_disable() will
write PIL_NORMAL_MAX into %pil, which is lower than PIL_NMI, and thus
we'll re-enable NMIs and recurse.
Doing a simple:
%pil = %pil | PIL_NORMAL_MAX
does what we want, if we're already at PIL_NMI (15) we leave it at
that setting, else we set it to PIL_NORMAL_MAX (14).
This should get the function tracer working on sparc64.
Signed-off-by: David S. Miller <davem@davemloft.net>
This gets rid of a local function (is_kernel_stack()) which tries to
do the same thing, yet poorly in that it doesn't handle IRQ stacks
properly.
Signed-off-by: David S. Miller <davem@davemloft.net>
* master.kernel.org:/home/rmk/linux-2.6-arm: (21 commits)
ARM: Fix ioremap_cached()/ioremap_wc() for SMP platforms
ARM: 6043/1: AT91 slow-clock resume: Don't wait for a disabled PLL to lock
ARM: 6031/1: fix Thumb-2 decompressor
ARM: 6029/1: ep93xx: gpio.c: local functions should be static
ARM: 6028/1: ARM: add MAINTAINERS for U300
ARM: 6024/1: bcmring: fix missing down on semaphore in dma.c
MXC: mach_armadillo5x0: Add USB Host support.
ARM mach-mx3: duplicated include
ARM mach-mx3: duplicated include
imx31: add watchdog device on litekit board.
imx3: Add watchdog platform device support
MXC: mach-mx31_3ds: add support for freescale mc13783 power management device.
MXC: mach-mx31_3ds: Add SPI1 device support.
MXC: mach-mx31_3ds: Add support for on board NAND Flash.
MXC: mach-mx31_3ds: Update variable names over recent mach name modification.
imx31: fix parent clock for rtc
i.MX51: remove NFC AXI static mapping
i.MX51: determine silicon revision dynamically
i.MX51: map TZIC dynamically
i.MX51: Use correct clock for gpt
...
The ebase is relative to CKSEG0 not CAC_BASE. On a 32-bit kernel they
are the same thing, for a 64-bit kernel they are not.
It happens to kind of work on a 64-bit kernel as they both reference
the same physical memory. However since the CPU uses the CKSEG0 base,
determining if a J instruction will reach always gives the wrong result
unless we use the same number the CPU uses.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1093/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
