linux-kernel - [PATCH] hpfs: Use hweight32

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Message-Id: <1258096028-13426-1-git-send-email-akinobu.mita@gmail.com>
Date:	Fri, 13 Nov 2009 16:07:08 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH] hpfs: Use hweight32

Use hweight32 instead of counting for each bit

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc: Al Viro <viro@...iv.linux.org.uk>
---
 fs/hpfs/super.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index f2feaa0..cf6fe4a 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -119,11 +119,8 @@ unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 	unsigned i, count;
 	if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
 	count = 0;
-	for (i = 0; i < 2048 / sizeof(unsigned); i++) {
-		unsigned b; 
-		if (!bits[i]) continue;
-		for (b = bits[i]; b; b>>=1) count += b & 1;
-	}
+	for (i = 0; i < 2048 / sizeof(unsigned); i++)
+		count += hweight32(bits[i]);
 	hpfs_brelse4(&qbh);
 	return count;
 }
-- 
1.6.5.1

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