linux/include/asm-generic/mutex-null.h
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   1/*
   2 * include/asm-generic/mutex-null.h
   3 *
   4 * Generic implementation of the mutex fastpath, based on NOP :-)
   5 *
   6 * This is used by the mutex-debugging infrastructure, but it can also
   7 * be used by architectures that (for whatever reason) want to use the
   8 * spinlock based slowpath.
   9 */
  10#ifndef _ASM_GENERIC_MUTEX_NULL_H
  11#define _ASM_GENERIC_MUTEX_NULL_H
  12
  13#define __mutex_fastpath_lock(count, fail_fn)           fail_fn(count)
  14#define __mutex_fastpath_lock_retval(count, fail_fn)    fail_fn(count)
  15#define __mutex_fastpath_unlock(count, fail_fn)         fail_fn(count)
  16#define __mutex_fastpath_trylock(count, fail_fn)        fail_fn(count)
  17#define __mutex_slowpath_needs_to_unlock()              1
  18
  19#endif
  20
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