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

As Peter points out, Doing a CALL+RET for just the decrement is a bit silly.

Fixes: d70f2a14b72a4bc ("include/linux/sched/mm.h: uninline mmdrop_async(), etc")
Acked-by: Peter Zijlstra (Intel) <peterz@infraded.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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.

diff --git a/kernel/fork.c b/kernel/fork.c
index be8aa5b..e5d9d40 100644 (file)
--- 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)
 {