diff options
Diffstat (limited to 'include/asm-ia64/rwsem.h')
| -rw-r--r-- | include/asm-ia64/rwsem.h | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/include/asm-ia64/rwsem.h b/include/asm-ia64/rwsem.h index 6ece5061dc1..e18b5ab0cb7 100644 --- a/include/asm-ia64/rwsem.h +++ b/include/asm-ia64/rwsem.h @@ -3,6 +3,7 @@ * * Copyright (C) 2003 Ken Chen <kenneth.w.chen@intel.com> * Copyright (C) 2003 Asit Mallick <asit.k.mallick@intel.com> + * Copyright (C) 2005 Christoph Lameter <clameter@sgi.com> * * Based on asm-i386/rwsem.h and other architecture implementation. * @@ -11,9 +12,9 @@ * * The lock count is initialized to 0 (no active and no waiting lockers). * - * When a writer subtracts WRITE_BIAS, it'll get 0xffff0001 for the case - * of an uncontended lock. Readers increment by 1 and see a positive value - * when uncontended, negative if there are writers (and maybe) readers + * When a writer subtracts WRITE_BIAS, it'll get 0xffffffff00000001 for + * the case of an uncontended lock. Readers increment by 1 and see a positive + * value when uncontended, negative if there are writers (and maybe) readers * waiting (in which case it goes to sleep). */ @@ -29,7 +30,7 @@ * the semaphore definition */ struct rw_semaphore { - signed int count; + signed long count; spinlock_t wait_lock; struct list_head wait_list; #if RWSEM_DEBUG @@ -37,10 +38,10 @@ struct rw_semaphore { #endif }; -#define RWSEM_UNLOCKED_VALUE 0x00000000 -#define RWSEM_ACTIVE_BIAS 0x00000001 -#define RWSEM_ACTIVE_MASK 0x0000ffff -#define RWSEM_WAITING_BIAS (-0x00010000) +#define RWSEM_UNLOCKED_VALUE __IA64_UL_CONST(0x0000000000000000) +#define RWSEM_ACTIVE_BIAS __IA64_UL_CONST(0x0000000000000001) +#define RWSEM_ACTIVE_MASK __IA64_UL_CONST(0x00000000ffffffff) +#define RWSEM_WAITING_BIAS -__IA64_UL_CONST(0x0000000100000000) #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) @@ -83,7 +84,7 @@ init_rwsem (struct rw_semaphore *sem) static inline void __down_read (struct rw_semaphore *sem) { - int result = ia64_fetchadd4_acq((unsigned int *)&sem->count, 1); + long result = ia64_fetchadd8_acq((unsigned long *)&sem->count, 1); if (result < 0) rwsem_down_read_failed(sem); @@ -95,7 +96,7 @@ __down_read (struct rw_semaphore *sem) static inline void __down_write (struct rw_semaphore *sem) { - int old, new; + long old, new; do { old = sem->count; @@ -112,7 +113,7 @@ __down_write (struct rw_semaphore *sem) static inline void __up_read (struct rw_semaphore *sem) { - int result = ia64_fetchadd4_rel((unsigned int *)&sem->count, -1); + long result = ia64_fetchadd8_rel((unsigned long *)&sem->count, -1); if (result < 0 && (--result & RWSEM_ACTIVE_MASK) == 0) rwsem_wake(sem); @@ -124,7 +125,7 @@ __up_read (struct rw_semaphore *sem) static inline void __up_write (struct rw_semaphore *sem) { - int old, new; + long old, new; do { old = sem->count; @@ -141,7 +142,7 @@ __up_write (struct rw_semaphore *sem) static inline int __down_read_trylock (struct rw_semaphore *sem) { - int tmp; + long tmp; while ((tmp = sem->count) >= 0) { if (tmp == cmpxchg_acq(&sem->count, tmp, tmp+1)) { return 1; @@ -156,7 +157,7 @@ __down_read_trylock (struct rw_semaphore *sem) static inline int __down_write_trylock (struct rw_semaphore *sem) { - int tmp = cmpxchg_acq(&sem->count, RWSEM_UNLOCKED_VALUE, + long tmp = cmpxchg_acq(&sem->count, RWSEM_UNLOCKED_VALUE, RWSEM_ACTIVE_WRITE_BIAS); return tmp == RWSEM_UNLOCKED_VALUE; } @@ -167,7 +168,7 @@ __down_write_trylock (struct rw_semaphore *sem) static inline void __downgrade_write (struct rw_semaphore *sem) { - int old, new; + long old, new; do { old = sem->count; @@ -182,7 +183,7 @@ __downgrade_write (struct rw_semaphore *sem) * Implement atomic add functionality. These used to be "inline" functions, but GCC v3.1 * doesn't quite optimize this stuff right and ends up with bad calls to fetchandadd. */ -#define rwsem_atomic_add(delta, sem) atomic_add(delta, (atomic_t *)(&(sem)->count)) -#define rwsem_atomic_update(delta, sem) atomic_add_return(delta, (atomic_t *)(&(sem)->count)) +#define rwsem_atomic_add(delta, sem) atomic64_add(delta, (atomic64_t *)(&(sem)->count)) +#define rwsem_atomic_update(delta, sem) atomic64_add_return(delta, (atomic64_t *)(&(sem)->count)) #endif /* _ASM_IA64_RWSEM_H */ |