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tracing: Improve message of empty set_ftrace_notrace file 

When there's no entry in set_ftrace_notrace, it'll print nothing, but
it's better to print something like below like set_graph_notrace does:

  #### no functions disabled ####

Link: http://lkml.kernel.org/p/1402644246-4649-1-git-send-email-namhyung@kernel.org

Reported-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Namhyung Kim 2014-06-13 16:24:06 +09:00 committed by Steven Rostedt
parent 280d1429b6
commit 8c006cf7a2
1 changed files with 8 additions and 3 deletions
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9
kernel/trace/ftrace.c
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@ -2835,8 +2835,10 @@ static void *t_start(struct seq_file *m, loff_t *pos)
* off, we can short cut and just print out that all
* functions are enabled.
*/
if (iter->flags & FTRACE_ITER_FILTER &&
ftrace_hash_empty(ops->filter_hash)) {
if ((iter->flags & FTRACE_ITER_FILTER &&
ftrace_hash_empty(ops->filter_hash)) ||
(iter->flags & FTRACE_ITER_NOTRACE &&
ftrace_hash_empty(ops->notrace_hash))) {
if (*pos > 0)
return t_hash_start(m, pos);
iter->flags |= FTRACE_ITER_PRINTALL;
@ -2881,6 +2883,9 @@ static int t_show(struct seq_file *m, void *v)
return t_hash_show(m, iter);
if (iter->flags & FTRACE_ITER_PRINTALL) {
if (iter->flags & FTRACE_ITER_NOTRACE)
seq_printf(m, "#### no functions disabled ####\n");
else
seq_printf(m, "#### all functions enabled ####\n");
return 0;
}