linux-kernel - [PATCH resend 5/6] reiserfs: use hweight

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Date:	Sun, 26 Jun 2011 14:57:55 +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>,
	reiserfs-devel@...r.kernel.org
Subject: [PATCH resend 5/6] reiserfs: use hweight_long()

Use hweight_long() to count free bits in the bitmap.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: reiserfs-devel@...r.kernel.org
---
 fs/reiserfs/bitmap.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
index 567385a..d1aca1d 100644
--- a/fs/reiserfs/bitmap.c
+++ b/fs/reiserfs/bitmap.c
@@ -1222,15 +1222,11 @@ void reiserfs_cache_bitmap_metadata(struct super_block *sb,
 	info->free_count = 0;
 
 	while (--cur >= (unsigned long *)bh->b_data) {
-		int i;
-
 		/* 0 and ~0 are special, we can optimize for them */
 		if (*cur == 0)
 			info->free_count += BITS_PER_LONG;
 		else if (*cur != ~0L)	/* A mix, investigate */
-			for (i = BITS_PER_LONG - 1; i >= 0; i--)
-				if (!reiserfs_test_le_bit(i, cur))
-					info->free_count++;
+			info->free_count += BITS_PER_LONG - hweight_long(*cur);
 	}
 }
 
-- 
1.7.4.4

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