linux-kernel - Re: [v3 PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm

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Message-ID: <20180410090917.GZ21835@dhcp22.suse.cz>
Date:   Tue, 10 Apr 2018 11:09:17 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     adobriyan@...il.com, willy@...radead.org, mguzik@...hat.com,
        gorcunov@...il.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v3 PATCH] mm: introduce arg_lock to protect arg_start|end and
 env_start|end in mm_struct

On Tue 10-04-18 05:52:54, Yang Shi wrote:
[...]
> So, introduce a new spinlock in mm_struct to protect the concurrent
> access to arg_start|end, env_start|end and others except start_brk and
> brk, which are still protected by mmap_sem to avoid concurrent access
> from do_brk().

Is there any fundamental problem with brk using the same lock?
-- 
Michal Hocko
SUSE Labs