X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Farch%2Fi386%2Finclude%2Farch%2Fsmp%2Fspinlock.h;h=65ad8d0673ad272cedb4850543d4c700b8ddb122;hb=b78c1972feed4c57eebba8f94de86a91e32c3fa7;hp=d0cc11c6a7dd95f95fcce9681b147950dde815c0;hpb=cadfd4c462673bcb44cdb1f193e52c95a888762a;p=coreboot.git

diff --git a/src/arch/i386/include/arch/smp/spinlock.h b/src/arch/i386/include/arch/smp/spinlock.h
index d0cc11c6a..65ad8d067 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 */