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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-06-24 09:54:00 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-24 11:02:52 +0200 |
| commit | 85951842a1020669f0a9eb0f0d1853b41341f097 (patch) | |
| tree | 799bba3e78b7424761901dacf3290ce05b9cb9ed /kernel/trace | |
| parent | f129e965bef40c6153e4fe505f1e408286213424 (diff) | |
| download | linux-85951842a1020669f0a9eb0f0d1853b41341f097.tar.gz linux-85951842a1020669f0a9eb0f0d1853b41341f097.tar.bz2 linux-85951842a1020669f0a9eb0f0d1853b41341f097.zip | |
ftrace: Don't increment @pos in g_start()
It's wrong to increment @pos in g_start(). It causes some entries
lost when reading set_graph_function, 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: <4A418738.7090401@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 3718d55fb4c3..cde74b9973b7 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2500,32 +2500,31 @@ int ftrace_graph_count; unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly; static void * -g_next(struct seq_file *m, void *v, loff_t *pos) +__g_next(struct seq_file *m, loff_t *pos) { unsigned long *array = m->private; - int index = *pos; - - (*pos)++; - if (index >= ftrace_graph_count) + if (*pos >= ftrace_graph_count) return NULL; + return &array[*pos]; +} - return &array[index]; +static void * +g_next(struct seq_file *m, void *v, loff_t *pos) +{ + (*pos)++; + return __g_next(m, pos); } static void *g_start(struct seq_file *m, loff_t *pos) { - void *p = NULL; - mutex_lock(&graph_lock); /* Nothing, tell g_show to print all functions are enabled */ if (!ftrace_graph_count && !*pos) return (void *)1; - p = g_next(m, p, pos); - - return p; + return __g_next(m, pos); } static void g_stop(struct seq_file *m, void *p) |