SPINLOCK_BACKOFF_HOOK

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# undef SPINLOCK_BACKOFF_HOOK

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# define SPINLOCK_BACKOFF_HOOK asm volatile("yield" ::: "memory")

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#define SPINLOCK_BACKOFF_HOOK (void)nullop((void *)0)

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#define SPINLOCK_BACKOFF_HOOK /* XXX ia64_pause() */

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# undef SPINLOCK_BACKOFF_HOOK

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# define SPINLOCK_BACKOFF_HOOK x86_pause()

55

#define SPINLOCK_BACKOFF_HOOK nullop(NULL)