---

yaml --- r: 312353 b: refs/heads/master c: a5fb833 h: refs/heads/master i: 312351: b602c90 v: v3
git-mirror · Jun 28, 2012 · a19a78f · a19a78f
1 parent be77e06
commit a19a78f
Show file tree

Hide file tree

Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6d158a813efcd09661c23f16ddf7e2ff834cb20c
+refs/heads/master: a5fb833172eca69136e9ee1ada778e404086ab8a
diff --git a/trunk/kernel/trace/ring_buffer.c b/trunk/kernel/trace/ring_buffer.c
@@ -3239,6 +3239,10 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
 	if (cpu_buffer->commit_page == cpu_buffer->reader_page)
 		goto out;
 
+	/* Don't bother swapping if the ring buffer is empty */
+	if (rb_num_of_entries(cpu_buffer) == 0)
+		goto out;
+
 	/*
 	 * Reset the reader page to size zero.
 	 */