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

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Message-ID: <20180418090314.GU17484@dhcp22.suse.cz>
Date:   Wed, 18 Apr 2018 11:03:14 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Cyrill Gorcunov <gorcunov@...il.com>
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 18-04-18 12:02:17, Cyrill Gorcunov wrote:
> 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?

No, I meant it to be a comment in the _code_.

-- 
Michal Hocko
SUSE Labs