summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--include/linux/sched/mm.h13
-rw-r--r--kernel/fork.c15
2 files changed, 14 insertions, 14 deletions
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 1149533aa2fa..9806184bb3d5 100644
--- 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.
diff --git a/kernel/fork.c b/kernel/fork.c
index be8aa5b98666..e5d9d405ae4e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -592,7 +592,7 @@ static void check_mm(struct mm_struct *mm)
* is dropped: either by a lazy thread or by
* mmput. Free the page directory and the mm.
*/
-static void __mmdrop(struct mm_struct *mm)
+void __mmdrop(struct mm_struct *mm)
{
BUG_ON(mm == &init_mm);
mm_free_pgd(mm);
@@ -603,18 +603,7 @@ static void __mmdrop(struct mm_struct *mm)
put_user_ns(mm->user_ns);
free_mm(mm);
}
-
-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);
-}
-EXPORT_SYMBOL_GPL(mmdrop);
+EXPORT_SYMBOL_GPL(__mmdrop);
static void mmdrop_async_fn(struct work_struct *work)
{