---

yaml --- r: 169625 b: refs/heads/master c: 559fdc3 h: refs/heads/master i: 169623: 4081ef3 v: v3
git-mirror · Nov 16, 2009 · 3f9b1a8 · 3f9b1a8
1 parent b7ac8f7
commit 3f9b1a8
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Showing 3 changed files with 12 additions and 12 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7255fe2a42c612f2b8fe4c347f0a5f0c97d85a46
+refs/heads/master: 559fdc3c1b624edb1933a875022fe7e27934d11c
diff --git a/trunk/include/linux/perf_event.h b/trunk/include/linux/perf_event.h
@@ -714,7 +714,6 @@ struct perf_output_handle {
 	int				nmi;
 	int				sample;
 	int				locked;
-	unsigned long			flags;
 };
 
 #ifdef CONFIG_PERF_EVENTS

diff --git a/trunk/kernel/perf_event.c b/trunk/kernel/perf_event.c
@@ -2674,20 +2674,21 @@ static void perf_output_wakeup(struct perf_output_handle *handle)
 static void perf_output_lock(struct perf_output_handle *handle)
 {
 	struct perf_mmap_data *data = handle->data;
-	int cpu;
+	int cur, cpu = get_cpu();
 
 	handle->locked = 0;
 
-	local_irq_save(handle->flags);
-	cpu = smp_processor_id();
-
-	if (in_nmi() && atomic_read(&data->lock) == cpu)
-		return;
+	for (;;) {
+		cur = atomic_cmpxchg(&data->lock, -1, cpu);
+		if (cur == -1) {
+			handle->locked = 1;
+			break;
+		}
+		if (cur == cpu)
+			break;
 
-	while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
 		cpu_relax();
-
-	handle->locked = 1;
+	}
 }
 
 static void perf_output_unlock(struct perf_output_handle *handle)
@@ -2733,7 +2734,7 @@ static void perf_output_unlock(struct perf_output_handle *handle)
 	if (atomic_xchg(&data->wakeup, 0))
 		perf_output_wakeup(handle);
 out:
-	local_irq_restore(handle->flags);
+	put_cpu();
 }
 
 void perf_output_copy(struct perf_output_handle *handle,