diff options
Diffstat (limited to 'include/asm-mips/spinlock.h')
| -rw-r--r-- | include/asm-mips/spinlock.h | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/include/asm-mips/spinlock.h b/include/asm-mips/spinlock.h index 4d0135b11156..669b8e349ff2 100644 --- a/include/asm-mips/spinlock.h +++ b/include/asm-mips/spinlock.h @@ -9,17 +9,16 @@ #ifndef _ASM_SPINLOCK_H #define _ASM_SPINLOCK_H -#include <linux/config.h> #include <asm/war.h> /* * Your basic SMP spinlocks, allowing only a single CPU anywhere */ -#define __raw_spin_is_locked(x) ((x)->lock != 0) +#define __raw_spin_is_locked(x) ((x)->lock != 0) #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) #define __raw_spin_unlock_wait(x) \ - do { cpu_relax(); } while ((x)->lock) + do { cpu_relax(); } while ((x)->lock) /* * Simple spin lock operations. There are two variants, one clears IRQ's @@ -119,6 +118,18 @@ static inline unsigned int __raw_spin_trylock(raw_spinlock_t *lock) * read-locks. */ +/* + * read_can_lock - would read_trylock() succeed? + * @lock: the rwlock in question. + */ +#define __raw_read_can_lock(rw) ((rw)->lock >= 0) + +/* + * write_can_lock - would write_trylock() succeed? + * @lock: the rwlock in question. + */ +#define __raw_write_can_lock(rw) (!(rw)->lock) + static inline void __raw_read_lock(raw_rwlock_t *rw) { unsigned int tmp; @@ -197,8 +208,7 @@ static inline void __raw_write_lock(raw_rwlock_t *rw) " lui %1, 0x8000 \n" " sc %1, %0 \n" " beqzl %1, 1b \n" - " nop \n" - " sync \n" + " sync \n" " .set reorder \n" : "=m" (rw->lock), "=&r" (tmp) : "m" (rw->lock) @@ -211,8 +221,7 @@ static inline void __raw_write_lock(raw_rwlock_t *rw) " lui %1, 0x8000 \n" " sc %1, %0 \n" " beqz %1, 1b \n" - " nop \n" - " sync \n" + " sync \n" " .set reorder \n" : "=m" (rw->lock), "=&r" (tmp) : "m" (rw->lock) @@ -246,8 +255,7 @@ static inline int __raw_write_trylock(raw_rwlock_t *rw) " lui %1, 0x8000 \n" " sc %1, %0 \n" " beqzl %1, 1b \n" - " nop \n" - " sync \n" + " sync \n" " li %2, 1 \n" " .set reorder \n" "2: \n" |