linux-kernel - [PATCH] drivers/video/fbdev/sis/sis_main.c: avoid repeated strlen() calls

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Message-Id: <1433855066-20260-1-git-send-email-linux@rasmusvillemoes.dk>
Date:	Tue,  9 Jun 2015 15:04:26 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Thomas Winischhofer <thomas@...ischhofer.net>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/video/fbdev/sis/sis_main.c: avoid repeated strlen() calls

gcc is not smart enough to realize that strlen(strbuf1) cannot be
changed by the loop body, so it is forced to recompute it, at least in
the branch containing the assignment. Avoid this by using an
equivalent stopping condition.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 drivers/video/fbdev/sis/sis_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
index fcf610edf217..ea95f8bf3922 100644
--- a/drivers/video/fbdev/sis/sis_main.c
+++ b/drivers/video/fbdev/sis/sis_main.c
@@ -172,7 +172,7 @@ static void sisfb_search_mode(char *name, bool quiet)
 
 	if(strlen(name) <= 19) {
 		strcpy(strbuf1, name);
-		for(i = 0; i < strlen(strbuf1); i++) {
+		for(i = 0; strbuf1[i]; i++) {
 			if(strbuf1[i] < '0' || strbuf1[i] > '9') strbuf1[i] = ' ';
 		}
 
-- 
2.1.3

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