diff options
Diffstat (limited to 'arch/metag/include/asm/spinlock.h')
| -rw-r--r-- | arch/metag/include/asm/spinlock.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/metag/include/asm/spinlock.h b/arch/metag/include/asm/spinlock.h index 86a7cf3d1386..c0c7a22be1ae 100644 --- a/arch/metag/include/asm/spinlock.h +++ b/arch/metag/include/asm/spinlock.h @@ -1,14 +1,24 @@ #ifndef __ASM_SPINLOCK_H #define __ASM_SPINLOCK_H +#include <asm/barrier.h> +#include <asm/processor.h> + #ifdef CONFIG_METAG_ATOMICITY_LOCK1 #include <asm/spinlock_lock1.h> #else #include <asm/spinlock_lnkget.h> #endif -#define arch_spin_unlock_wait(lock) \ - do { while (arch_spin_is_locked(lock)) cpu_relax(); } while (0) +/* + * both lock1 and lnkget are test-and-set spinlocks with 0 unlocked and 1 + * locked. + */ + +static inline void arch_spin_unlock_wait(arch_spinlock_t *lock) +{ + smp_cond_load_acquire(&lock->lock, !VAL); +} #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock) |