---

yaml --- r: 191062 b: refs/heads/master c: 4807e3d h: refs/heads/master v: v3
git-mirror · Mar 10, 2010 · a7500c7 · a7500c7
1 parent 36891a6
commit a7500c7
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8f4aebd2be9892bf8fb79a2d8576d3f3ee7f00f6
+refs/heads/master: 4807e3d5dc7bb7057dd6ca3abb09f3da2eb8c323
diff --git a/trunk/arch/x86/kernel/cpu/perf_event_intel_ds.c b/trunk/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;