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