diff options
Diffstat (limited to 'include/asm-sparc64/spinlock.h')
| -rw-r--r-- | include/asm-sparc64/spinlock.h | 48 |
1 files changed, 31 insertions, 17 deletions
diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h index 11efa474865b..d1f91a4f24ae 100644 --- a/include/asm-sparc64/spinlock.h +++ b/include/asm-sparc64/spinlock.h @@ -31,15 +31,20 @@ #ifndef CONFIG_DEBUG_SPINLOCK -typedef unsigned char spinlock_t; -#define SPIN_LOCK_UNLOCKED 0 +typedef struct { + volatile unsigned char lock; +#ifdef CONFIG_PREEMPT + unsigned int break_lock; +#endif +} spinlock_t; +#define SPIN_LOCK_UNLOCKED (spinlock_t) {0,} -#define spin_lock_init(lock) (*((unsigned char *)(lock)) = 0) -#define spin_is_locked(lock) (*((volatile unsigned char *)(lock)) != 0) +#define spin_lock_init(lp) do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0) +#define spin_is_locked(lp) ((lp)->lock != 0) -#define spin_unlock_wait(lock) \ +#define spin_unlock_wait(lp) \ do { membar("#LoadLoad"); \ -} while(*((volatile unsigned char *)lock)) +} while(lp->lock) static inline void _raw_spin_lock(spinlock_t *lock) { @@ -109,20 +114,19 @@ static inline void _raw_spin_lock_flags(spinlock_t *lock, unsigned long flags) #else /* !(CONFIG_DEBUG_SPINLOCK) */ typedef struct { - unsigned char lock; + volatile unsigned char lock; unsigned int owner_pc, owner_cpu; +#ifdef CONFIG_PREEMPT + unsigned int break_lock; +#endif } spinlock_t; #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, 0xff } -#define spin_lock_init(__lock) \ -do { (__lock)->lock = 0; \ - (__lock)->owner_pc = 0; \ - (__lock)->owner_cpu = 0xff; \ -} while(0) -#define spin_is_locked(__lock) (*((volatile unsigned char *)(&((__lock)->lock))) != 0) +#define spin_lock_init(lp) do { *(lp)= SPIN_LOCK_UNLOCKED; } while(0) +#define spin_is_locked(__lock) ((__lock)->lock != 0) #define spin_unlock_wait(__lock) \ do { \ membar("#LoadLoad"); \ -} while(*((volatile unsigned char *)(&((__lock)->lock)))) +} while((__lock)->lock) extern void _do_spin_lock (spinlock_t *lock, char *str); extern void _do_spin_unlock (spinlock_t *lock); @@ -139,8 +143,13 @@ extern int _do_spin_trylock (spinlock_t *lock); #ifndef CONFIG_DEBUG_SPINLOCK -typedef unsigned int rwlock_t; -#define RW_LOCK_UNLOCKED 0 +typedef struct { + volatile unsigned int lock; +#ifdef CONFIG_PREEMPT + unsigned int break_lock; +#endif +} rwlock_t; +#define RW_LOCK_UNLOCKED {0,} #define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0) static void inline __read_lock(rwlock_t *lock) @@ -251,9 +260,12 @@ static int inline __write_trylock(rwlock_t *lock) #else /* !(CONFIG_DEBUG_SPINLOCK) */ typedef struct { - unsigned long lock; + volatile unsigned long lock; unsigned int writer_pc, writer_cpu; unsigned int reader_pc[NR_CPUS]; +#ifdef CONFIG_PREEMPT + unsigned int break_lock; +#endif } rwlock_t; #define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0, 0xff, { } } #define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0) @@ -304,6 +316,8 @@ do { unsigned long flags; \ #endif /* CONFIG_DEBUG_SPINLOCK */ #define _raw_read_trylock(lock) generic_raw_read_trylock(lock) +#define read_can_lock(rw) (!((rw)->lock & 0x80000000UL)) +#define write_can_lock(rw) (!(rw)->lock) #endif /* !(__ASSEMBLY__) */ |