ocfs2: use memweight()

Use memweight to count the total number of bits set in memory area.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 210c352..a9f78c7 100644 (file)
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -784,14 +784,10 @@ bail:
 
 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
 {
-       int i;
-       u8 *buffer;
-       u32 count = 0;
+       u32 count;
        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 
-       buffer = la->la_bitmap;
-       for (i = 0; i < le16_to_cpu(la->la_size); i++)
-               count += hweight8(buffer[i]);
+       count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
 
        trace_ocfs2_local_alloc_count_bits(count);
        return count;