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locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin_unlock() assembly code
The LOCK_PREFIX macro should be used in the __raw_callee_save___pv_queued_spin_unlock() assembly code, so that the lock prefix can be patched out on UP systems. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Joe Mario <jmario@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/1531858560-21547-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -43,7 +43,7 @@ asm (".pushsection .text;"
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"push %rdx;"
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"mov $0x1,%eax;"
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"xor %edx,%edx;"
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"lock cmpxchg %dl,(%rdi);"
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LOCK_PREFIX "cmpxchg %dl,(%rdi);"
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"cmp $0x1,%al;"
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"jne .slowpath;"
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"pop %rdx;"
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