diff options
Diffstat (limited to 'arch/parisc/include/asm/spinlock_types.h')
| -rw-r--r-- | arch/parisc/include/asm/spinlock_types.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/parisc/include/asm/spinlock_types.h b/arch/parisc/include/asm/spinlock_types.h index 42979c5704dc..ca39ee350c3f 100644 --- a/arch/parisc/include/asm/spinlock_types.h +++ b/arch/parisc/include/asm/spinlock_types.h @@ -12,11 +12,19 @@ typedef struct { #endif } arch_spinlock_t; + +/* counter: + * Unlocked : 0x0100_0000 + * Read lock(s) : 0x00FF_FFFF to 0x01 (Multiple Readers decrement it) + * Write lock : 0x0, but only if prior value is "unlocked" 0x0100_0000 + */ typedef struct { - arch_spinlock_t lock; - volatile int counter; + arch_spinlock_t lock_mutex; + volatile unsigned int counter; } arch_rwlock_t; -#define __ARCH_RW_LOCK_UNLOCKED { __ARCH_SPIN_LOCK_UNLOCKED, 0 } +#define __ARCH_RW_LOCK_UNLOCKED__ 0x01000000 +#define __ARCH_RW_LOCK_UNLOCKED { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \ + .counter = __ARCH_RW_LOCK_UNLOCKED__ } #endif |