linux-kernel - Re: [RFC] prctl: Deprecate non PR_SET_MM

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Date:   Wed, 4 Apr 2018 08:54:59 -0700
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Cyrill Gorcunov <gorcunov@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Vagin <avagin@...nvz.org>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [RFC] prctl: Deprecate non PR_SET_MM_MAP operations



On 4/3/18 10:35 PM, Michal Hocko wrote:
> On Tue 03-04-18 16:15:20, Yang Shi wrote:
>>
>> On 4/3/18 3:37 PM, Cyrill Gorcunov wrote:
>>> An ability to manipulate mm_struct fields was introduced in
>>> sake of CRIU in first place. Later we provide more suitable
>>> and safe operation PR_SET_MM_MAP where all fields to be modifed
>>> are passed in one structure which allows us to make more detailed
>>> verification.
>>>
>>> Still old interface remains present for compatibility reason
>>> though CRIU itself already switched to PR_SET_MM_MAP on its
>>> own long ago.
>>>
>>> Googling didn't reveal some other users of this operation
>>> so I think it should be safe to issue deprecation warning
>>> first time and get rid of this interface after a couple
>>> of releases.
>>>
>>> CC: Andrey Vagin <avagin@...nvz.org>
>>> CC: Andrew Morton <akpm@...uxfoundation.org>
>>> CC: Pavel Emelyanov <xemul@...tuozzo.com>
>>> CC: Michael Kerrisk <mtk.manpages@...il.com>
>>> CC: Yang Shi <yang.shi@...ux.alibaba.com>
>>> CC: Michal Hocko <mhocko@...nel.org>
>>> Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
>>> ---
>>> Or we can simply drop it off because PR_SET_MM_MAP covers all needs,
>>> and I would rather prefer to do that asap.
>> Thanks for making it deprecated. I'd prefer just drop it off if nobody
>> objects. The change will get soaked in linux-next for a while , we will know
>> if it breaks compatibility (it sounds very unlikely).
> Yeah, let's just drop it and have the patch in linux-next (via mmotm)
> for 2 release cycles and see whether somebody complains.

BTW, I will do my v3 on top of the patch (drop off prctl_set_mm).

Yang

>
> You can add
> Acked-by: Michal Hocko <mhocko@...e.com>
> for such a patch.