ext2: use memweight()
authorAkinobu Mita <akinobu.mita@gmail.com>
Mon, 30 Jul 2012 21:41:05 +0000 (14:41 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 31 Jul 2012 00:25:16 +0000 (17:25 -0700)
commitecd0afa3ced0ebf36901b53fd9ee431f8a34a161
treef78190903beee21c2c2d872ed9645cbcb316796d
parenta75613ec73ec87726a81fe421385a13c25fdcfc4
ext2: use memweight()

Convert ext2_count_free() to use memweight() instead of table lookup
based counting clear bits implementation.  This change only affects the
code segments enabled by EXT2FS_DEBUG.

Note that this memweight() call can't be replaced with a single
bitmap_weight() call, although the pointer to the memory area is aligned
to long-word boundary.  Because the size of the memory area may not be a
multiple of BITS_PER_LONG, then it returns wrong value on big-endian
architecture.

This also includes the following changes.

- Remove unnecessary map == NULL check in ext2_count_free() which
  always takes non-null pointer as the memory area.

- Fix printk format warning that only reveals with EXT2FS_DEBUG.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/ext2/balloc.c
fs/ext2/ialloc.c