Merge branch 'tracing/urgent' into tracing/ftrace

Conflicts:
	kernel/trace/trace.c

2 files changed, 17 insertions, 2 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 6781e9aab2c..ee9b93d318b 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1065,7 +1065,7 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
 
 		/* Did the write stamp get updated already? */
 		if (unlikely(ts < cpu_buffer->write_stamp))
-			goto again;
+			delta = 0;
 
 		if (test_time_stamp(delta)) {
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f147f198b9a..0c22fe2d43a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2835,7 +2835,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 {
 	unsigned long val;
 	char buf[64];
-	int ret;
+	int ret, cpu;
 
 	if (cnt >= sizeof(buf))
 		return -EINVAL;
@@ -2857,6 +2857,14 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 
 	tracing_stop();
 
+	/* disable all cpu buffers */
+	for_each_tracing_cpu(cpu) {
+		if (global_trace.data[cpu])
+			atomic_inc(&global_trace.data[cpu]->disabled);
+		if (max_tr.data[cpu])
+			atomic_inc(&max_tr.data[cpu]->disabled);
+	}
+
 	if (val != global_trace.entries) {
 		ret = ring_buffer_resize(global_trace.buffer, val);
 		if (ret < 0) {
@@ -2888,6 +2896,13 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 	if (tracing_disabled)
 		cnt = -ENOMEM;
  out:
+	for_each_tracing_cpu(cpu) {
+		if (global_trace.data[cpu])
+			atomic_dec(&global_trace.data[cpu]->disabled);
+		if (max_tr.data[cpu])
+			atomic_dec(&max_tr.data[cpu]->disabled);
+	}
+
 	tracing_start();
 	max_tr.entries = global_trace.entries;
 	mutex_unlock(&trace_types_lock);