linux-kernel - Re: [v4 PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm

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Date:   Wed, 18 Apr 2018 12:02:17 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Yang Shi <yang.shi@...ux.alibaba.com>, adobriyan@...il.com,
        willy@...radead.org, mguzik@...hat.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [v4 PATCH] mm: introduce arg_lock to protect arg_start|end and
 env_start|end in mm_struct

On Wed, Apr 18, 2018 at 10:05:55AM +0200, Michal Hocko wrote:
> 
> Yes, looks good to me. As mentioned in other emails prctl_set_mm_map
> really deserves a comment explaining why we are doing the down_read
> 
> What about something like the following?
> "
> arg_lock protects concurent updates but we still need mmap_sem for read
> to exclude races with do_brk.
> "
> Acked-by: Michal Hocko <mhocko@...e.com>

Yes, thanks! Andrew, could you slightly update the changelog please?