linux-kernel - [for-next][PATCH 1/5] tracing/kprobe: Remove unneeded extra strchr() from create_trace

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Date:   Wed, 26 Sep 2018 12:12:27 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [for-next][PATCH 1/5] tracing/kprobe: Remove unneeded extra strchr() from
 create_trace_kprobe()

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

By utilizing a temporary variable, we can avoid adding another call to
strchr(). Instead, save the first call to a temp variable, and then use that
variable as the reference to set the event variable.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_kprobe.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index c30032367aab..508396edc56a 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -749,10 +749,13 @@ static int create_trace_kprobe(int argc, char **argv)
 	}
 
 	if (event) {
-		if (strchr(event, '/')) {
+		char *slash;
+
+		slash = strchr(event, '/');
+		if (slash) {
 			group = event;
-			event = strchr(group, '/') + 1;
-			event[-1] = '\0';
+			event = slash + 1;
+			slash[0] = '\0';
 			if (strlen(group) == 0) {
 				pr_info("Group name is not specified\n");
 				return -EINVAL;
-- 
2.18.0