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ftrace: state that all functions are enabled in set_ftrace_filter

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Impact: clean up, make set_ftrace_filter less confusing

The set_ftrace_filter shows only the functions that will be traced.
But when it is empty, it will trace all functions. This can be a bit
confusing.

This patch makes set_ftrace_filter show:

  #### all functions enabled ####

When all functions will be traced, and we do not filter only a select
few.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-16 11:21:52 -05:00
parent 5fb896a4e9
commit 0c75a3ed63
1 changed files with 23 additions and 0 deletions
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23
kernel/trace/ftrace.c
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@ -773,6 +773,7 @@ enum {
FTRACE_ITER_CONT = (1 << 1),
FTRACE_ITER_NOTRACE = (1 << 2),
FTRACE_ITER_FAILURES = (1 << 3),
FTRACE_ITER_PRINTALL = (1 << 4),
};
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
@ -794,6 +795,9 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
(*pos)++;
if (iter->flags & FTRACE_ITER_PRINTALL)
return NULL;
/* should not be called from interrupt context */
spin_lock(&ftrace_lock);
retry:
@ -834,6 +838,19 @@ static void *t_start(struct seq_file *m, loff_t *pos)
struct ftrace_iterator *iter = m->private;
void *p = NULL;
/*
* For set_ftrace_filter reading, if we have the filter
* off, we can short cut and just print out that all
* functions are enabled.
*/
if (iter->flags & FTRACE_ITER_FILTER && !ftrace_filtered) {
if (*pos > 0)
return NULL;
iter->flags |= FTRACE_ITER_PRINTALL;
(*pos)++;
return iter;
}
if (*pos > 0) {
if (iter->idx < 0)
return p;
@ -852,9 +869,15 @@ static void t_stop(struct seq_file *m, void *p)
static int t_show(struct seq_file *m, void *v)
{
struct ftrace_iterator *iter = m->private;
struct dyn_ftrace *rec = v;
char str[KSYM_SYMBOL_LEN];
if (iter->flags & FTRACE_ITER_PRINTALL) {
seq_printf(m, "#### all functions enabled ####\n");
return 0;
}
if (!rec)
return 0;