powerpc: lock bitops
Add non-trivial lock bitops implementation for powerpc. Signed-off-by: NNick Piggin <npiggin@suse.de> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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