diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-03-06 13:47:07 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-10 13:23:36 +0100 |
| commit | 4807e3d5dc7bb7057dd6ca3abb09f3da2eb8c323 (patch) | |
| tree | 408ad33e37e9c0c75e3d8084e6f995d3ba91c342 | |
| parent | 8f4aebd2be9892bf8fb79a2d8576d3f3ee7f00f6 (diff) | |
perf, x86: Fix PEBS enable/disable vs cpuc->enabled
We should never call ->enable with the pmu enabled, and we _can_ have
->disable called with the pmu enabled.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_ds.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 66c6962f15f9..9ad0e67b9c82 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -338,7 +338,7 @@ static void intel_pmu_pebs_enable(struct perf_event *event) hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT; val |= 1ULL << hwc->idx; - wrmsrl(MSR_IA32_PEBS_ENABLE, val); + WARN_ON_ONCE(cpuc->enabled); if (x86_pmu.intel_cap.pebs_trap) intel_pmu_lbr_enable(event); @@ -351,7 +351,8 @@ static void intel_pmu_pebs_disable(struct perf_event *event) u64 val = cpuc->pebs_enabled; val &= ~(1ULL << hwc->idx); - wrmsrl(MSR_IA32_PEBS_ENABLE, val); + if (cpuc->enabled) + wrmsrl(MSR_IA32_PEBS_ENABLE, val); hwc->config |= ARCH_PERFMON_EVENTSEL_INT; |