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authorLai Jiangshan <laijs@cn.fujitsu.com>2009-03-25 16:27:17 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-25 18:32:34 +0100
commite6f489013b985b58d096a3091ece0ed579367232 (patch)
tree598baf56ceb47c256338ae4934937d2e6e111181 /kernel/trace/trace_stat.c
parentee000b7f9fe429d2470c674ccec8d344f6789e0d (diff)
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> Acked-by: Steven Rostedt <srostedt@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> LKML-Reference: <49C9EAE5.5070202@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_stat.c')
-rw-r--r--kernel/trace/trace_stat.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index f71b85b22cf..8c129dd480a 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -163,7 +163,7 @@ 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);
}
@@ -172,6 +172,9 @@ 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);
}
@@ -186,6 +189,9 @@ 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);
}