linux-toradex.git/arch/x86/kernel/cpu, branch v3.1

x86, perf: Check that current->mm is alive before getting user callchain

2011-08-31T13:56:31+00:00

An event may occur when an mm is already released.

I added an event in dequeue_entity() and caught a panic with
the following backtrace:

[  434.421110] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
[  434.421258] IP: [] __get_user_pages_fast+0x9c/0x120
...
[  434.421258] Call Trace:
[  434.421258]  [] copy_from_user_nmi+0x51/0xf0
[  434.421258]  [] ? sched_clock_local+0x25/0x90
[  434.421258]  [] perf_callchain_user+0x128/0x170
[  434.421258]  [] ? __perf_event_header__init_id+0xed/0x100
[  434.421258]  [] perf_prepare_sample+0x200/0x280
[  434.421258]  [] __perf_event_overflow+0x1b8/0x290
[  434.421258]  [] ? tg_shares_up+0x0/0x670
[  434.421258]  [] ? walk_tg_tree+0x6a/0xb0
[  434.421258]  [] perf_swevent_overflow+0xc4/0xf0
[  434.421258]  [] do_perf_sw_event+0x1e0/0x250
[  434.421258]  [] perf_tp_event+0x44/0x70
[  434.421258]  [] ftrace_profile_sched_block+0xdf/0x110
[  434.421258]  [] dequeue_entity+0x2ad/0x2d0
[  434.421258]  [] dequeue_task_fair+0x1c/0x60
[  434.421258]  [] dequeue_task+0x9a/0xb0
[  434.421258]  [] deactivate_task+0x42/0xe0
[  434.421258]  [] thread_return+0x191/0x808
[  434.421258]  [] ? switch_task_namespaces+0x24/0x60
[  434.421258]  [] do_exit+0x464/0x910
[  434.421258]  [] do_group_exit+0x58/0xd0
[  434.421258]  [] sys_exit_group+0x17/0x20
[  434.421258]  [] system_call_fastpath+0x16/0x1b

Signed-off-by: Andrey Vagin 
Signed-off-by: Peter Zijlstra 
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1314693156-24131-1-git-send-email-avagin@openvz.org
Signed-off-by: Ingo Molnar

mtrr: fix UP breakage caused during switch to stop_machine

2011-08-25T18:02:29+00:00

While removing custom rendezvous code and switching to stop_machine,
commit 192d8857427d ("x86, mtrr: use stop_machine APIs for doing MTRR
rendezvous") completely dropped mtrr setting code on !CONFIG_SMP
breaking MTRR settting on UP.

Fix it by removing the incorrect CONFIG_SMP.

Signed-off-by: Tejun Heo 
Reported-by: Anders Eriksson 
Tested-and-acked-by: Suresh Siddha 
Acked-by: H. Peter Anvin 
Signed-off-by: Linus Torvalds

perf, x86: Add model 45 SandyBridge support

2011-08-09T09:58:06+00:00

Add support to Romely-EP SandyBridge.

Signed-off-by: Youquan Song 
Signed-off-by: Anhua Xu 
Signed-off-by: Lin Ming 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/1312264895-2010-1-git-send-email-youquan.song@intel.com
Signed-off-by: Ingo Molnar

atomic: use

2011-07-26T23:49:47+00:00

This allows us to move duplicated code in 
(atomic_inc_not_zero() for now) to 

Signed-off-by: Arun Sharma 
Reviewed-by: Eric Dumazet 
Cc: Ingo Molnar 
Cc: David Miller 
Cc: Eric Dumazet 
Acked-by: Mike Frysinger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branches 'x86-detect-hyper-for-linus', 'x86-fpu-for-linus', 'x86-kexec-for-linus', 'x86-platform-for-linus', 'x86-quirks-for-linus', 'x86-tsc-for-linus' and 'x86-smpboot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23T17:38:21+00:00

* 'x86-detect-hyper-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, hyper: Change hypervisor detection order

* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86-32, fpu: Fix DNA exception during check_fpu()

* 'x86-kexec-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  kexec, x86: Fix incorrect jump back address if not preserving context

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, config: Introduce an INTEL_MID configuration

* 'x86-quirks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, quirks: Use pci_dev->revision

* 'x86-tsc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: tsc: Remove unneeded DMI-based blacklisting

* 'x86-smpboot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, boot: Wait for boot cpu to show up if nr_cpus limit is about to hit

Merge branch 'x86-mtrr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23T00:04:04+00:00

* 'x86-mtrr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, mtrr: Use pci_dev->revision
  x86, mtrr: use stop_machine APIs for doing MTRR rendezvous
  stop_machine: implement stop_machine_from_inactive_cpu()
  stop_machine: reorganize stop_cpus() implementation
  x86, mtrr: lock stop machine during MTRR rendezvous sequence

Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23T00:03:40+00:00

* 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, mce: Use mce_sysdev_ prefix to group functions
  x86, mce: Use mce_chrdev_ prefix to group functions
  x86, mce: Cleanup mce_read()
  x86, mce: Cleanup mce_create()/remove_device()
  x86, mce: Check the result of ancient_init()
  x86, mce: Introduce mce_gather_info()
  x86, mce: Replace MCM_ with MCI_MISC_
  x86, mce: Replace MCE_SELF_VECTOR by irq_work
  x86, mce, severity: Clean up trivial coding style problems
  x86, mce, severity: Cleanup severity table
  x86, mce, severity: Make formatting a bit more readable
  x86, mce, severity: Fix two severities table signatures

Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-07-23T00:02:54+00:00

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, intel, power: Correct the MSR_IA32_ENERGY_PERF_BIAS message
  x86, msr: Fix typo in ENERGY_PERF_BIAS_POWERSAVE
  x86, intel, power: Initialize MSR_IA32_ENERGY_PERF_BIAS

x86, perf: Make copy_from_user_nmi() a library function

2011-07-21T18:41:57+00:00

copy_from_user_nmi() is used in oprofile and perf. Moving it to other
library functions like copy_from_user(). As this is x86 code for 32
and 64 bits, create a new file usercopy.c for unified code.

Signed-off-by: Robert Richter 
Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20110607172413.GJ20052@erda.amd.com
Signed-off-by: Ingo Molnar

x86, perf: P4 PMU - Fix typos in comments and style cleanup

2011-07-21T18:41:54+00:00

This patch:

 - fixes typos in comments and clarifies the text
 - renames obscure p4_event_alias::original and ::alter members to
   ::original and ::alternative as appropriate
 - drops parenthesis from the return of p4_get_alias_event()

No functional changes.

Reported-by: Ingo Molnar 
Signed-off-by: Cyrill Gorcunov 
Link: http://lkml.kernel.org/r/20110721160625.GX7492@sun
Signed-off-by: Ingo Molnar