---

yaml --- r: 191058 b: refs/heads/master c: 74846d3 h: refs/heads/master v: v3
git-mirror · Mar 10, 2010 · 9b9dc94 · 9b9dc94
1 parent f3389c3
commit 9b9dc94
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Showing 3 changed files with 20 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3c44780b220e876b01e39d4028cd6f4205fbf5d6
+refs/heads/master: 74846d35b24b6efd61bb88a0a750b6bb257e6e78
diff --git a/trunk/arch/x86/kernel/cpu/perf_event_intel.c b/trunk/arch/x86/kernel/cpu/perf_event_intel.c
@@ -767,6 +767,20 @@ static __initconst struct x86_pmu core_pmu = {
 	.event_constraints	= intel_core_event_constraints,
 };
 
+static void intel_pmu_cpu_starting(int cpu)
+{
+	init_debug_store_on_cpu(cpu);
+	/*
+	 * Deal with CPUs that don't clear their LBRs on power-up.
+	 */
+	intel_pmu_lbr_reset();
+}
+
+static void intel_pmu_cpu_dying(int cpu)
+{
+	fini_debug_store_on_cpu(cpu);
+}
+
 static __initconst struct x86_pmu intel_pmu = {
 	.name			= "Intel",
 	.handle_irq		= intel_pmu_handle_irq,
@@ -788,8 +802,8 @@ static __initconst struct x86_pmu intel_pmu = {
 	.max_period		= (1ULL << 31) - 1,
 	.get_event_constraints	= intel_get_event_constraints,
 
-	.cpu_starting		= init_debug_store_on_cpu,
-	.cpu_dying		= fini_debug_store_on_cpu,
+	.cpu_starting		= intel_pmu_cpu_starting,
+	.cpu_dying		= intel_pmu_cpu_dying,
 };
 
 static void intel_clovertown_quirks(void)

diff --git a/trunk/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/trunk/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -53,6 +53,9 @@ static void intel_pmu_lbr_reset_64(void)
 
 static void intel_pmu_lbr_reset(void)
 {
+	if (!x86_pmu.lbr_nr)
+		return;
+
 	if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_32)
 		intel_pmu_lbr_reset_32();
 	else