diff options
Diffstat (limited to 'kernel/include/linux/rwlock_types.h')
| -rw-r--r-- | kernel/include/linux/rwlock_types.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/kernel/include/linux/rwlock_types.h b/kernel/include/linux/rwlock_types.h new file mode 100644 index 000000000..d0da966ad --- /dev/null +++ b/kernel/include/linux/rwlock_types.h @@ -0,0 +1,53 @@ +#ifndef __LINUX_RWLOCK_TYPES_H +#define __LINUX_RWLOCK_TYPES_H + +#if !defined(__LINUX_SPINLOCK_TYPES_H) +# error "Do not include directly, include spinlock_types.h" +#endif + +/* + * include/linux/rwlock_types.h - generic rwlock type definitions + * and initializers + * + * portions Copyright 2005, Red Hat, Inc., Ingo Molnar + * Released under the General Public License (GPL). + */ +typedef struct { + arch_rwlock_t raw_lock; +#ifdef CONFIG_GENERIC_LOCKBREAK + unsigned int break_lock; +#endif +#ifdef CONFIG_DEBUG_SPINLOCK + unsigned int magic, owner_cpu; + void *owner; +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} rwlock_t; + +#define RWLOCK_MAGIC 0xdeaf1eed + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } +#else +# define RW_DEP_MAP_INIT(lockname) +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK +#define __RW_LOCK_UNLOCKED(lockname) \ + (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ + .magic = RWLOCK_MAGIC, \ + .owner = SPINLOCK_OWNER_INIT, \ + .owner_cpu = -1, \ + RW_DEP_MAP_INIT(lockname) } +#else +#define __RW_LOCK_UNLOCKED(lockname) \ + (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ + RW_DEP_MAP_INIT(lockname) } +#endif + +#define DEFINE_RWLOCK(name) \ + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name) + +#endif /* __LINUX_RWLOCK_TYPES_H */ |