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Subject[PATCH 01/15] ftrace: state that all functions are enabled in set_ftrace_filter
From: Steven Rostedt <srostedt@redhat.com>

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>
---
kernel/trace/ftrace.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1796e01..369fb78 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -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;

--
1.5.6.5
--


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