linux-kernel - [PATCH -mm] hpfs: Use bitmap

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Message-Id: <1258340819-28166-1-git-send-email-akinobu.mita@gmail.com>
Date:	Mon, 16 Nov 2009 12:06:59 +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 -mm] hpfs: Use bitmap_weight()

Use bitmap_weight instead of doing hweight32 for each 32bit in bitmap.

This patch applies on top of hpfs-use-hweight32.patch in -mm

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 |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index cf6fe4a..cadc4ce 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -14,6 +14,7 @@
 #include <linux/magic.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>
+#include <linux/bitmap.h>
 
 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
 
@@ -115,12 +116,13 @@ static void hpfs_put_super(struct super_block *s)
 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 {
 	struct quad_buffer_head qbh;
-	unsigned *bits;
-	unsigned i, count;
-	if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
-	count = 0;
-	for (i = 0; i < 2048 / sizeof(unsigned); i++)
-		count += hweight32(bits[i]);
+	unsigned long *bits;
+	unsigned count;
+
+	bits = hpfs_map_4sectors(s, secno, &qbh, 4);
+	if (!bits)
+		return 0;
+	count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 	hpfs_brelse4(&qbh);
 	return count;
 }
-- 
1.6.5.1

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