unix98 allocated_ptys_lock semaphore to mutex
Convert the unix98 allocated_ptys_lock to a mutex. Signed-off-by: NDaniel Walker <dwalker@mvista.com> Acked-by: NIngo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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