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yaml --- r: 199142 b: refs/heads/master c: 1eaa478 h: refs/heads/master v: v3
git-mirror · May 15, 2010 · 23cbd58 · 23cbd58
1 parent 5cf811c
commit 23cbd58
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Showing 2 changed files with 9 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e1f7992e015ae1373d66c8068d0a45e4111a0aed
+refs/heads/master: 1eaa4787a774c4896518c81f24e8bccaa2244924
diff --git a/trunk/include/linux/ftrace_event.h b/trunk/include/linux/ftrace_event.h
@@ -169,7 +169,14 @@ struct ftrace_event_call {
 	 *   bit 1:		enabled
 	 *   bit 2:		filter_active
 	 *
-	 *  Must hold event_mutex to change.
+	 * Changes to flags must hold the event_mutex.
+	 *
+	 * Note: Reads of flags do not hold the event_mutex since
+	 * they occur in critical sections. But the way flags
+	 * is currently used, these changes do no affect the code
+	 * except that when a change is made, it may have a slight
+	 * delay in propagating the changes to other CPUs due to
+	 * caching and such.
 	 */
 	unsigned int		flags;