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    ext3: use memweight() · 10d47084
    Akinobu Mita 提交于
    Convert ext3_count_free() to use memweight() instead of table lookup
    based counting clear bits implementation.  This change only affects the
    code segments enabled by EXT3FS_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 ext3_count_free() which
      always takes non-null pointer as the memory area.
    
    - Fix printk format warning that only reveals with EXT3FS_DEBUG.
    Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
    Acked-by: NJan Kara <jack@suse.cz>
    Cc: Andreas Dilger <adilger.kernel@dilger.ca>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    10d47084
bitmap.c 426 字节