Convert bit_spin_lock to new locking bitops.  Slub can use the non-atomic
store version to clear (Christoph?)
Signed-off-by: NNick Piggin <npiggin@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>