linux-kernel - [patch] mm, oom: remove unused mmput

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Date:   Mon, 14 Aug 2017 17:34:32 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
cc:     Michal Hocko <mhocko@...nel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Oleg Nesterov <oleg@...hat.com>,
        Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: [patch] mm, oom: remove unused mmput_async

After "mm: oom: let oom_reap_task and exit_mmap to run concurrently", 
mmput_async() is no longer used.  Remove it.

Cc: Andrea Arcangeli <aarcange@...hat.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 include/linux/sched/mm.h |  6 ------
 kernel/fork.c            | 16 ----------------
 2 files changed, 22 deletions(-)

diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -84,12 +84,6 @@ static inline bool mmget_not_zero(struct mm_struct *mm)
 
 /* mmput gets rid of the mappings and all user-space */
 extern void mmput(struct mm_struct *);
-#ifdef CONFIG_MMU
-/* same as above but performs the slow path from the async context. Can
- * be called from the atomic context as well
- */
-extern void mmput_async(struct mm_struct *);
-#endif
 
 /* Grab a reference to a task's mm, if it is not already going away */
 extern struct mm_struct *get_task_mm(struct task_struct *task);
diff --git a/kernel/fork.c b/kernel/fork.c
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -925,22 +925,6 @@ void mmput(struct mm_struct *mm)
 }
 EXPORT_SYMBOL_GPL(mmput);
 
-#ifdef CONFIG_MMU
-static void mmput_async_fn(struct work_struct *work)
-{
-	struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
-	__mmput(mm);
-}
-
-void mmput_async(struct mm_struct *mm)
-{
-	if (atomic_dec_and_test(&mm->mm_users)) {
-		INIT_WORK(&mm->async_put_work, mmput_async_fn);
-		schedule_work(&mm->async_put_work);
-	}
-}
-#endif
-
 /**
  * set_mm_exe_file - change a reference to the mm's executable file
  *