linux-kernel - [PATCH 02/10] minixfs: use memweight()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1337520203-29147-2-git-send-email-akinobu.mita@gmail.com>
Date:	Sun, 20 May 2012 22:23:15 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>
Subject: [PATCH 02/10] minixfs: use memweight()

Use memweight() to count the total number of bits clear in memory area.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
 fs/minix/bitmap.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/minix/bitmap.c b/fs/minix/bitmap.c
index 4bc50da..564f1a5 100644
--- a/fs/minix/bitmap.c
+++ b/fs/minix/bitmap.c
@@ -29,10 +29,8 @@ static __u32 count_free(struct buffer_head *map[], unsigned blocksize, __u32 num
 	unsigned blocks = DIV_ROUND_UP(numbits, blocksize * 8);
 
 	while (blocks--) {
-		unsigned words = blocksize / 2;
-		__u16 *p = (__u16 *)(*map++)->b_data;
-		while (words--)
-			sum += 16 - hweight16(*p++);
+		sum += blocksize * BITS_PER_BYTE -
+			memweight((*map++)->b_data, blocksize);
 	}
 
 	return sum;
-- 
1.7.7.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/