diff options
Diffstat (limited to 'src/arch/i386/include/arch/smp/spinlock.h')
| -rw-r--r-- | src/arch/i386/include/arch/smp/spinlock.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/arch/i386/include/arch/smp/spinlock.h b/src/arch/i386/include/arch/smp/spinlock.h index d0cc11c6a7..65ad8d0673 100644 --- a/src/arch/i386/include/arch/smp/spinlock.h +++ b/src/arch/i386/include/arch/smp/spinlock.h @@ -54,4 +54,10 @@ static inline void spin_unlock(spinlock_t *lock) :"=m" (lock->lock) : : "memory"); } +/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ +static inline void cpu_relax(void) +{ + __asm__ __volatile__("rep;nop": : :"memory"); +} + #endif /* ARCH_SMP_SPINLOCK_H */ |