linux-toradex.git/arch/x86/kernel, branch v3.4.65

x86/reboot: Add quirk to make Dell C6100 use reboot=pci automatically

2013-10-05T14:06:53+00:00

commit 4f0acd31c31f03ba42494c8baf6c0465150e2621 upstream.

Dell PowerEdge C6100 machines fail to completely reboot about 20% of the time.

Signed-off-by: Masoud Sharbiani 
Signed-off-by: Vinson Lee 
Cc: Robin Holt 
Cc: Russell King 
Cc: Guan Xuetao 
Link: http://lkml.kernel.org/r/1379717947-18042-1-git-send-email-vlee@freedesktop.org
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

x86, fpu: correct the asm constraints for fxsave, unbreak mxcsr.daz

2013-08-11T22:38:43+00:00

commit eaa5a990191d204ba0f9d35dbe5505ec2cdd1460 upstream.

GCC will optimize mxcsr_feature_mask_init in arch/x86/kernel/i387.c:

		memset(&fx_scratch, 0, sizeof(struct i387_fxsave_struct));
		asm volatile("fxsave %0" : : "m" (fx_scratch));
		mask = fx_scratch.mxcsr_mask;
		if (mask == 0)
			mask = 0x0000ffbf;

to

		memset(&fx_scratch, 0, sizeof(struct i387_fxsave_struct));
		asm volatile("fxsave %0" : : "m" (fx_scratch));
		mask = 0x0000ffbf;

since asm statement doesn’t say it will update fx_scratch.  As the
result, the DAZ bit will be cleared.  This patch fixes it. This bug
dates back to at least kernel 2.6.12.

Signed-off-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

x86: Fix typo in kexec register clearing

2013-06-20T18:58:46+00:00

commit c8a22d19dd238ede87aa0ac4f7dbea8da039b9c1 upstream.

Fixes a typo in register clearing code. Thanks to PaX Team for fixing
this originally, and James Troup for pointing it out.

Signed-off-by: Kees Cook 
Link: http://lkml.kernel.org/r/20130605184718.GA8396@www.outflux.net
Cc: PaX Team 
Signed-off-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

perf/x86/intel/lbr: Demand proper privileges for PERF_SAMPLE_BRANCH_KERNEL

2013-05-11T20:48:07+00:00

commit 7cc23cd6c0c7d7f4bee057607e7ce01568925717 upstream.

We should always have proper privileges when requesting kernel
data.

Signed-off-by: Peter Zijlstra 
Cc: Andi Kleen 
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/20130503121256.230745028@chello.nl
[ Fix build error reported by fengguang.wu@intel.com, propagate error code back. ]
Signed-off-by: Ingo Molnar 
Link: http://lkml.kernel.org/n/tip-v0x9ky3ahzr6nm3c6ilwrili@git.kernel.org
Signed-off-by: Greg Kroah-Hartman

perf/x86/intel/lbr: Fix LBR filter

2013-05-11T20:48:07+00:00

commit 6e15eb3ba6c0249c9e8c783517d131b47db995ca upstream.

The LBR 'from' adddress is under full userspace control; ensure
we validate it before reading from it.

Note: is_module_text_address() can potentially be quite
expensive; for those running into that with high overhead
in modules optimize it using an RCU backed rb-tree.

Reported-by: Andi Kleen 
Signed-off-by: Peter Zijlstra 
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/20130503121256.158211806@chello.nl
Signed-off-by: Ingo Molnar 
Link: http://lkml.kernel.org/n/tip-mk8i82ffzax01cnqo829iy1q@git.kernel.org
Signed-off-by: Greg Kroah-Hartman

x86: Eliminate irq_mis_count counted in arch_irq_stat

2013-05-08T02:51:57+00:00

commit f7b0e1055574ce06ab53391263b4e205bf38daf3 upstream.

With the current implementation, kstat_cpu(cpu).irqs_sum is also
increased in case of irq_mis_count increment.

So there is no need to count irq_mis_count in arch_irq_stat,
otherwise irq_mis_count will be counted twice in the sum of
/proc/stat.

Reported-by: Liu Chuansheng 
Signed-off-by: Li Fei 
Acked-by: Liu Chuansheng 
Cc: tomoki.sekiyama.qu@hitachi.com
Cc: joe@perches.com
Link: http://lkml.kernel.org/r/1366980611.32469.7.camel@fli24-HP-Compaq-8100-Elite-CMT-PC
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

perf/x86: Fix offcore_rsp valid mask for SNB/IVB

2013-04-26T04:19:55+00:00

commit f1923820c447e986a9da0fc6bf60c1dccdf0408e upstream.

The valid mask for both offcore_response_0 and
offcore_response_1 was wrong for SNB/SNB-EP,
IVB/IVB-EP. It was possible to write to
reserved bit and cause a GP fault crashing
the kernel.

This patch fixes the problem by correctly marking the
reserved bits in the valid mask for all the processors
mentioned above.

A distinction between desktop and server parts is introduced
because bits 24-30 are only available on the server parts.

This version of the  patch is just a rebase to perf/urgent tree
and should apply to older kernels as well.

Signed-off-by: Stephane Eranian 
Cc: peterz@infradead.org
Cc: jolsa@redhat.com
Cc: ak@linux.intel.com
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

x86, mm: Patch out arch_flush_lazy_mmu_mode() when running on bare metal

2013-04-17T04:27:27+00:00

commit 511ba86e1d386f671084b5d0e6f110bb30b8eeb2 upstream.

Invoking arch_flush_lazy_mmu_mode() results in calls to
preempt_enable()/disable() which may have performance impact.

Since lazy MMU is not used on bare metal we can patch away
arch_flush_lazy_mmu_mode() so that it is never called in such
environment.

[ hpa: the previous patch "Fix vmalloc_fault oops during lazy MMU
  updates" may cause a minor performance regression on
  bare metal.  This patch resolves that performance regression.  It is
  somewhat unclear to me if this is a good -stable candidate. ]

Signed-off-by: Boris Ostrovsky 
Link: http://lkml.kernel.org/r/1364045796-10720-2-git-send-email-konrad.wilk@oracle.com
Tested-by: Josh Boyer 
Tested-by: Konrad Rzeszutek Wilk 
Acked-by: Borislav Petkov 
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

perf,x86: fix wrmsr_on_cpu() warning on suspend/resume

2013-03-20T20:05:00+00:00

commit 2a6e06b2aed6995af401dcd4feb5e79a0c7ea554 upstream.

Commit 1d9d8639c063 ("perf,x86: fix kernel crash with PEBS/BTS after
suspend/resume") fixed a crash when doing PEBS performance profiling
after resuming, but in using init_debug_store_on_cpu() to restore the
DS_AREA mtrr it also resulted in a new WARN_ON() triggering.

init_debug_store_on_cpu() uses "wrmsr_on_cpu()", which in turn uses CPU
cross-calls to do the MSR update.  Which is not really valid at the
early resume stage, and the warning is quite reasonable.  Now, it all
happens to _work_, for the simple reason that smp_call_function_single()
ends up just doing the call directly on the CPU when the CPU number
matches, but we really should just do the wrmsr() directly instead.

This duplicates the wrmsr() logic, but hopefully we can just remove the
wrmsr_on_cpu() version eventually.

Reported-and-tested-by: Parag Warudkar 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

2013-03-20T20:04:59+00:00

commit 1d9d8639c063caf6efc2447f5f26aa637f844ff6 upstream.

This patch fixes a kernel crash when using precise sampling (PEBS)
after a suspend/resume. Turns out the CPU notifier code is not invoked
on CPU0 (BP). Therefore, the DS_AREA (used by PEBS) is not restored properly
by the kernel and keeps it power-on/resume value of 0 causing any PEBS
measurement to crash when running on CPU0.

The workaround is to add a hook in the actual resume code to restore
the DS Area MSR value. It is invoked for all CPUS. So for all but CPU0,
the DS_AREA will be restored twice but this is harmless.

Reported-by: Linus Torvalds 
Signed-off-by: Stephane Eranian 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman