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Subject[PATCH] trace_stat: don't call seq_printf() in seq_operation->start()

Impact: Fix incorrect way using seq_file's API

Use SEQ_START_TOKEN instead of calling ->stat_headers()
int seq_operation->start().

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 39310e3..5fe73b6 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -160,7 +160,7 @@ static void *stat_seq_start(struct seq_file *s, loff_t *pos)

/* If we are in the beginning of the file, print the headers */
if (!*pos && session->ts->stat_headers)
- session->ts->stat_headers(s);
+ return SEQ_START_TOKEN;

return seq_list_start(&session->stat_list, *pos);
}
@@ -169,6 +169,9 @@ static void *stat_seq_next(struct seq_file *s, void *p, loff_t *pos)
{
struct tracer_stat_session *session = s->private;

+ if (p == SEQ_START_TOKEN)
+ return seq_list_start(&session->stat_list, *pos);
+
return seq_list_next(p, &session->stat_list, pos);
}

@@ -183,6 +186,9 @@ static int stat_seq_show(struct seq_file *s, void *v)
struct tracer_stat_session *session = s->private;
struct trace_stat_list *l = list_entry(v, struct trace_stat_list, list);

+ if (v == SEQ_START_TOKEN)
+ return session->ts->stat_headers(s);
+
return session->ts->stat_show(s, l->stat);
}




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