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locking: Split rwlock from spinlock headers
Move the rwlock defines and inlines into separate header files. This makes the selection for -rt easier. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
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4 changed files with 195 additions and 129 deletions
125
include/linux/rwlock.h
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125
include/linux/rwlock.h
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#ifndef __LINUX_RWLOCK_H
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#define __LINUX_RWLOCK_H
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#ifndef __LINUX_SPINLOCK_H
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# error "please don't include this file directly"
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#endif
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/*
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* rwlock related methods
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*
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* split out from spinlock.h
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*
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* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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* Released under the General Public License (GPL).
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*/
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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void __rwlock_init(rwlock_t *lock, const char *name,
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struct lock_class_key *key);
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# define rwlock_init(lock) \
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do { \
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static struct lock_class_key __key; \
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\
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__rwlock_init((lock), #lock, &__key); \
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} while (0)
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#else
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# define rwlock_init(lock) \
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do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void _raw_read_lock(rwlock_t *lock);
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#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
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extern int _raw_read_trylock(rwlock_t *lock);
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extern void _raw_read_unlock(rwlock_t *lock);
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extern void _raw_write_lock(rwlock_t *lock);
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#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
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extern int _raw_write_trylock(rwlock_t *lock);
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extern void _raw_write_unlock(rwlock_t *lock);
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#else
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# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
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# define _raw_read_lock_flags(lock, flags) \
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__raw_read_lock_flags(&(lock)->raw_lock, *(flags))
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# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
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# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
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# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
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# define _raw_write_lock_flags(lock, flags) \
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__raw_write_lock_flags(&(lock)->raw_lock, *(flags))
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# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
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# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
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#endif
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#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
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#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
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/*
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* Define the various rw_lock methods. Note we define these
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* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
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* methods are defined as nops in the case they are not required.
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*/
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#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
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#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
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#define write_lock(lock) _write_lock(lock)
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#define read_lock(lock) _read_lock(lock)
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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#define read_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _read_lock_irqsave(lock); \
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} while (0)
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#define write_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _write_lock_irqsave(lock); \
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} while (0)
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#else
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#define read_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_read_lock_irqsave(lock, flags); \
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} while (0)
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#define write_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_write_lock_irqsave(lock, flags); \
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} while (0)
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#endif
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#define read_lock_irq(lock) _read_lock_irq(lock)
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#define read_lock_bh(lock) _read_lock_bh(lock)
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#define write_lock_irq(lock) _write_lock_irq(lock)
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#define write_lock_bh(lock) _write_lock_bh(lock)
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#define read_unlock(lock) _read_unlock(lock)
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#define write_unlock(lock) _write_unlock(lock)
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#define read_unlock_irq(lock) _read_unlock_irq(lock)
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#define write_unlock_irq(lock) _write_unlock_irq(lock)
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#define read_unlock_irqrestore(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_read_unlock_irqrestore(lock, flags); \
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} while (0)
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#define read_unlock_bh(lock) _read_unlock_bh(lock)
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#define write_unlock_irqrestore(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_write_unlock_irqrestore(lock, flags); \
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} while (0)
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#define write_unlock_bh(lock) _write_unlock_bh(lock)
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#define write_trylock_irqsave(lock, flags) \
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({ \
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local_irq_save(flags); \
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write_trylock(lock) ? \
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1 : ({ local_irq_restore(flags); 0; }); \
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})
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#endif /* __LINUX_RWLOCK_H */
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