---

yaml --- r: 158308 b: refs/heads/master c: 1653192 h: refs/heads/master v: v3
git-mirror · Sep 4, 2009 · 0b170a8 · 0b170a8
1 parent 94e3020
commit 0b170a8
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Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 596da17f94c103348ebe04129c00d536ea0e80e2
+refs/heads/master: 1653192f510bd8114b7b133d7289e6e5c3e95046
diff --git a/trunk/arch/x86/kernel/cpu/perf_counter.c b/trunk/arch/x86/kernel/cpu/perf_counter.c
@@ -984,8 +984,15 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
 	 * Branch tracing:
 	 */
 	if ((attr->config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
-	    (hwc->sample_period == 1) && !bts_available())
-		return -EOPNOTSUPP;
+	    (hwc->sample_period == 1)) {
+		/* BTS is not supported by this architecture. */
+		if (!bts_available())
+			return -EOPNOTSUPP;
+
+		/* BTS is currently only allowed for user-mode. */
+		if (hwc->config & ARCH_PERFMON_EVENTSEL_OS)
+			return -EOPNOTSUPP;
+	}
 
 	hwc->config |= config;