linux-kernel - [PATCH 1/1] fs/hfsplus/wrapper.c: replace shift loop by fls

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Date:	Fri, 16 May 2014 17:53:31 +0200
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	akpm <akpm@...ux-foundation.org>, Joe Perches <joe@...ches.com>
Subject: [PATCH 1/1] fs/hfsplus/wrapper.c: replace shift loop by fls

Replace while blocksize;shift by fls - 1

Suggested-By: Joe Perches <joe@...ches.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/hfsplus/wrapper.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c
index 3f99964..9a7040e 100644
--- a/fs/hfsplus/wrapper.c
+++ b/fs/hfsplus/wrapper.c
@@ -8,6 +8,7 @@
  * Handling of HFS wrappers around HFS+ volumes
  */
 
+#include <linux/bitops.h>
 #include <linux/fs.h>
 #include <linux/blkdev.h>
 #include <linux/cdrom.h>
@@ -231,9 +232,7 @@ reread:
 	if (blocksize < HFSPLUS_SECTOR_SIZE || ((blocksize - 1) & blocksize))
 		goto out_free_backup_vhdr;
 	sbi->alloc_blksz = blocksize;
-	sbi->alloc_blksz_shift = 0;
-	while ((blocksize >>= 1) != 0)
-		sbi->alloc_blksz_shift++;
+	sbi->alloc_blksz_shift = fls(blocksize) - 1;
 	blocksize = min(sbi->alloc_blksz, (u32)PAGE_SIZE);
 
 	/*
-- 
1.8.4.5

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