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authorLi Zefan <lizf@cn.fujitsu.com>2009-06-24 09:53:26 +0800
committerIngo Molnar <mingo@elte.hu>2009-06-24 11:02:51 +0200
commit2961bf345fd1b736c3db46cad0f69855f67fbe9c (patch)
tree2032d3b59b4a93445209b5b1f0428159b61837d2
parentc8961ec6da22ea010bf4470a8e0fb3fdad0f11c4 (diff)
downloadop-kernel-dev-2961bf345fd1b736c3db46cad0f69855f67fbe9c.zip
op-kernel-dev-2961bf345fd1b736c3db46cad0f69855f67fbe9c.tar.gz
trace_stat: Don't increment @pos in seq start()
It's wrong to increment @pos in stat_seq_start(). It causes some stat entries lost when reading stat file, if the output of the file is larger than PAGE_SIZE. Reviewed-by: Liming Wang <liming.wang@windriver.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A418716.90209@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/trace_stat.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index c006437..e66f5e4 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -199,17 +199,13 @@ static void *stat_seq_start(struct seq_file *s, loff_t *pos)
mutex_lock(&session->stat_mutex);
/* If we are in the beginning of the file, print the headers */
- if (!*pos && session->ts->stat_headers) {
- (*pos)++;
+ if (!*pos && session->ts->stat_headers)
return SEQ_START_TOKEN;
- }
node = rb_first(&session->stat_root);
for (i = 0; node && i < *pos; i++)
node = rb_next(node);
- (*pos)++;
-
return node;
}
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