From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pw0-f49.google.com ([209.85.160.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Rqmji-0007KX-Jr for linux-mtd@lists.infradead.org; Fri, 27 Jan 2012 14:25:07 +0000 Received: by mail-pw0-f49.google.com with SMTP id x9so2050943pbd.36 for ; Fri, 27 Jan 2012 06:25:06 -0800 (PST) From: Akinobu Mita To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: [PATCH] mtd/tests: use memchr_inv Date: Fri, 27 Jan 2012 23:24:54 +0900 Message-Id: <1327674295-3700-7-git-send-email-akinobu.mita@gmail.com> In-Reply-To: <1327674295-3700-1-git-send-email-akinobu.mita@gmail.com> References: <1327674295-3700-1-git-send-email-akinobu.mita@gmail.com> Cc: linux-mtd@lists.infradead.org, David Woodhouse , Akinobu Mita List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Use memchr_inv to check if the data contains all 0xFF bytes. It is faster than looping for each byte. Signed-off-by: Akinobu Mita Cc: David Woodhouse Cc: linux-mtd@lists.infradead.org --- drivers/mtd/tests/mtd_pagetest.c | 16 ++++++++-------- 1 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/mtd/tests/mtd_pagetest.c b/drivers/mtd/tests/mtd_pagetest.c index 252ddb0..08847cf 100644 --- a/drivers/mtd/tests/mtd_pagetest.c +++ b/drivers/mtd/tests/mtd_pagetest.c @@ -401,6 +401,7 @@ static int erasetest(void) size_t read, written; int err = 0, i, ebnum, ok = 1; loff_t addr0; + unsigned char *p; printk(PRINT_PREF "erasetest\n"); @@ -442,14 +443,13 @@ static int erasetest(void) printk(PRINT_PREF "verifying 1st page of block %d is all 0xff\n", ebnum); - for (i = 0; i < pgsize; ++i) - if (twopages[i] != 0xff) { - printk(PRINT_PREF "verifying all 0xff failed at %d\n", - i); - errcnt += 1; - ok = 0; - break; - } + p = memchr_inv(twopages, 0xff, pgsize); + if (p) { + printk(PRINT_PREF "verifying all 0xff failed at %d\n", + p - twopages); + errcnt += 1; + ok = 0; + } if (ok && !err) printk(PRINT_PREF "erasetest ok\n"); -- 1.7.4.4