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v0.5.1
https://github.com/torvalds/linux
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Tip revision: 55922c9d1b84b89cb946c777fddccb3247e7df2c authored by Linus Torvalds on 30 May 2011, 00:43:36 UTC
Linux 3.0-rc1
Tip revision: 55922c9
mutex-null.h
/*
 * include/asm-generic/mutex-null.h
 *
 * Generic implementation of the mutex fastpath, based on NOP :-)
 *
 * This is used by the mutex-debugging infrastructure, but it can also
 * be used by architectures that (for whatever reason) want to use the
 * spinlock based slowpath.
 */
#ifndef _ASM_GENERIC_MUTEX_NULL_H
#define _ASM_GENERIC_MUTEX_NULL_H

#define __mutex_fastpath_lock(count, fail_fn)		fail_fn(count)
#define __mutex_fastpath_lock_retval(count, fail_fn)	fail_fn(count)
#define __mutex_fastpath_unlock(count, fail_fn)		fail_fn(count)
#define __mutex_fastpath_trylock(count, fail_fn)	fail_fn(count)
#define __mutex_slowpath_needs_to_unlock()		1

#endif
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