perf: Fix perf probe build error

When we run into dry run mode, we want to make
write_kprobe_trace_event to succeed on writing the event. Let's
initialize it to 0.

Fixes the following build error:
	util/probe-event.c:1266: attention : «ret» may be used uninitialized in this function
	util/probe-event.c:1266: note: «ret» was declared here

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1271808065-25290-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 3967f8f..4fb4803 100644 (file)
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1263,7 +1263,7 @@ static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
 
 static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
 {
 
 static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
 {

-       int ret;
+       int ret = 0;

        char *buf = synthesize_kprobe_trace_command(tev);
 
        if (!buf) {
        char *buf = synthesize_kprobe_trace_command(tev);
 
        if (!buf) {