x86: convert mm_context_t semaphore to a mutex
convert mm_context_t semaphore to a mutex. Signed-off-by: NLuiz Fernando N. Capitulino <lcapitulino@mandriva.com.br> Cc: Andi Kleen <ak@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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