linux-kernel - [PATCH v2 02/10] minixfs: use memweight()

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Message-Id: <1338644416-11417-2-git-send-email-akinobu.mita@gmail.com>
Date:	Sat,  2 Jun 2012 22:40:08 +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>,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH v2 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>
Cc: linux-fsdevel@...r.kernel.org
---

No changes from v1

 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

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