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yaml --- r: 288720 b: refs/heads/master c: 88c9a65 h: refs/heads/master v: v3
git-mirror · Mar 5, 2012 · 3d93e1b · 3d93e1b
1 parent c15306a
commit 3d93e1b
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c5cc2cd906ea9fe73e3c93f9ad824996faa278cc
+refs/heads/master: 88c9a65e13f393fd60d8b9e9c659a34f9e39967d
diff --git a/trunk/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/trunk/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -315,6 +315,16 @@ void intel_pmu_lbr_init_snb(void)
 /* atom */
 void intel_pmu_lbr_init_atom(void)
 {
+	/*
+	 * only models starting at stepping 10 seems
+	 * to have an operational LBR which can freeze
+	 * on PMU interrupt
+	 */
+	if (boot_cpu_data.x86_mask < 10) {
+		pr_cont("LBR disabled due to erratum");
+		return;
+	}
+
 	x86_pmu.lbr_nr	   = 8;
 	x86_pmu.lbr_tos    = MSR_LBR_TOS;
 	x86_pmu.lbr_from   = MSR_LBR_CORE_FROM;