perf probe: Check e_snprintf() format string

Check e_snprintf() format string by gcc, and fix a bug of
e_snprintf() caller.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091207170053.19230.7690.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 1 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index de0d91385c91..88e180449933 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -48,6 +48,9 @@
 
 /* If there is no space to write, returns -E2BIG. */
 static int e_snprintf(char *str, size_t size, const char *format, ...)
+        __attribute__((format(printf, 3, 4)));
+
+static int e_snprintf(char *str, size_t size, const char *format, ...)
 {
         int ret;
         va_list ap;
@@ -258,7 +261,7 @@ int synthesize_perf_probe_event(struct probe_point *pp)
                 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function,
                                  offs, pp->retprobe ? "%return" : "", line);
         else
-                ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->file, line);
+                ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line);
         if (ret <= 0)
                 goto error;
         len = ret;