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authorLinus Torvalds <torvalds@linux-foundation.org>2013-03-17 15:44:43 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-20 13:05:00 -0700
commitd7805638b85ce978f7c0cf1ac49204d4288084f6 (patch)
tree07e7e08575d7ab4e3af38f0bac9e1835973491e8 /arch/x86
parent8c97feb5edd118fe633ed29773c599536d562d43 (diff)
perf,x86: fix wrmsr_on_cpu() warning on suspend/resume
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 <parag.lkml@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel_ds.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 5bef15c516d5..fca48c4ce94a 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -726,8 +726,10 @@ void intel_ds_init(void)
void perf_restore_debug_store(void)
{
+ struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds);
+
if (!x86_pmu.bts && !x86_pmu.pebs)
return;
- init_debug_store_on_cpu(smp_processor_id());
+ wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds);
}