include/asm-generic/mutex-null.h

   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 /* extra parameter only needed for mutex debugging: */
  14 #ifndef __IP__
  15 # define __IP__
  16 #endif
  17
  18 #define __mutex_fastpath_lock(count, fail_fn)         fail_fn(count __RET_IP__)
  19 #define __mutex_fastpath_lock_retval(count, fail_fn)  fail_fn(count __RET_IP__)
  20 #define __mutex_fastpath_unlock(count, fail_fn)       fail_fn(count __RET_IP__)
  21 #define __mutex_fastpath_trylock(count, fail_fn)      fail_fn(count)
  22 #define __mutex_slowpath_needs_to_unlock()            1
  23
  24 #endif