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   1 /*
   2  * 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