tracing: Fix uninitialized variable of tracing/trace output

Because a local variable is not initialized, I got these
when I did 'cat tracing/trace'. (not trace_pipe):

CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770221: lock_acquire: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770221: lock_release: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446612133255294080 EVENTS]
              ps-3099  [000]   560.770221: lock_acquire: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770222: lock_release: ffff880030865010 &(&dentry->d_lock)->rlock
CPU:0 [LOST 18446744071579453134 EVENTS]
              ps-3099  [000]   560.770222: lock_release: ffffffff816cfb98 dcache_lock

See peek_next_entry(), it does not set *lost_events when we 'cat tracing/trace'

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4BB9A929.2000303@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0498beb..b9be232 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1571,7 +1571,7 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu,
 {
        struct ring_buffer *buffer = iter->tr->buffer;
        struct trace_entry *ent, *next = NULL;
-       unsigned long lost_events, next_lost = 0;
+       unsigned long lost_events = 0, next_lost = 0;
        int cpu_file = iter->cpu_file;
        u64 next_ts = 0, ts;
        int next_cpu = -1;