From mboxrd@z Thu Jan 1 00:00:00 1970 From: Akinobu Mita Subject: [PATCH v2 02/10] minixfs: use memweight() Date: Sat, 2 Jun 2012 22:40:08 +0900 Message-ID: <1338644416-11417-2-git-send-email-akinobu.mita@gmail.com> References: <1338644416-11417-1-git-send-email-akinobu.mita@gmail.com> Cc: Akinobu Mita , linux-fsdevel@vger.kernel.org To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Return-path: In-Reply-To: <1338644416-11417-1-git-send-email-akinobu.mita@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Use memweight() to count the total number of bits clear in memory area. Signed-off-by: Akinobu Mita Cc: linux-fsdevel@vger.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