From: Tom Zanussi <tom.zanussi@linux.intel.com>
Date: Mon, 4 Feb 2019 21:07:23 +0000 (-0600)
Subject: tracing: Use str_has_prefix() in synth_event_create()
X-Git-Tag: v5.4-rc1~1381^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed581aaf99be10883c8364df16bd80a7b8f72efc;p=platform%2Fkernel%2Flinux-rpi.git

tracing: Use str_has_prefix() in synth_event_create()

Since we now have a str_has_prefix() that returns the length, we can
use that instead of explicitly calculating it.

Link: http://lkml.kernel.org/r/03418373fd1e80030e7394b8e3e081c5de28a710.1549309756.git.tom.zanussi@linux.intel.com

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 66386ba..5b03b9a 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1316,8 +1316,8 @@ static int synth_event_create(int argc, const char **argv)
 
 	/* This interface accepts group name prefix */
 	if (strchr(name, '/')) {
-		len = sizeof(SYNTH_SYSTEM "/") - 1;
-		if (strncmp(name, SYNTH_SYSTEM "/", len))
+		len = str_has_prefix(name, SYNTH_SYSTEM "/");
+		if (len == 0)
 			return -EINVAL;
 		name += len;
 	}