1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index f363bc8fdc74..9f3199571994 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -126,6 +126,15 @@ static inline int mutex_is_locked(struct mutex *lock)
         return atomic_read(&lock->count) != 1;
 }
 
+/* return non-zero to abort.  only pre-side-effects may abort */
+typedef int (*side_effect_t)(unsigned long);
+extern void mutex_lock_sfx(struct mutex *lock,
+                                                   side_effect_t pre, unsigned long pre_arg,
+                                                   side_effect_t post, unsigned long post_arg);
+extern void mutex_unlock_sfx(struct mutex *lock,
+                                                         side_effect_t pre, unsigned long pre_arg,
+                                                         side_effect_t post, unsigned long post_arg);
+
 /*
  * See kernel/mutex.c for detailed documentation of these APIs.
  * Also see Documentation/mutex-design.txt.
@@ -145,6 +154,7 @@ extern void mutex_lock(struct mutex *lock);
 extern int __must_check mutex_lock_interruptible(struct mutex *lock);
 extern int __must_check mutex_lock_killable(struct mutex *lock);
 
+
 # define mutex_lock_nested(lock, subclass) mutex_lock(lock)
 # define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
 # define mutex_lock_killable_nested(lock, subclass) mutex_lock_killable(lock)