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

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Date:   Tue, 15 Aug 2017 07:49:33 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.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: Re: [patch] mm, oom: remove unused mmput_async

On Mon 14-08-17 17:34:32, David Rientjes wrote:
> 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>

Acked-by: Michal Hocko <mhocko@...e.com>

Thanks!

> ---
>  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
>   *
> 
> --
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-- 
Michal Hocko
SUSE Labs