include/linux/sched/mm.h: re-inline mmdrop()

[linux-2.6-microblaze.git] / include / linux / sched / mm.h

diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 1149533..9806184 100644 (file)
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -36,7 +36,18 @@ static inline void mmgrab(struct mm_struct *mm)
        atomic_inc(&mm->mm_count);
 }
 
-extern void mmdrop(struct mm_struct *mm);
+extern void __mmdrop(struct mm_struct *mm);
+
+static inline void mmdrop(struct mm_struct *mm)
+{
+       /*
+        * The implicit full barrier implied by atomic_dec_and_test() is
+        * required by the membarrier system call before returning to
+        * user-space, after storing to rq->curr.
+        */
+       if (unlikely(atomic_dec_and_test(&mm->mm_count)))
+               __mmdrop(mm);
+}
 
 /**
  * mmget() - Pin the address space associated with a &struct mm_struct.