linux-kernel - Re: [PATCH v2] prctl: Deprecate non PR_SET_MM

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Message-Id: <20180418152820.e8f317534c01696d4835a40f@linux-foundation.org>
Date:   Wed, 18 Apr 2018 15:28:20 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrey Vagin <avagin@...nvz.org>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>
Subject: Re: [PATCH v2] prctl: Deprecate non PR_SET_MM_MAP operations

On Thu, 5 Apr 2018 21:26:51 +0300 Cyrill Gorcunov <gorcunov@...il.com> wrote:

> Subject: [PATCH v2] prctl: Deprecate non PR_SET_MM_MAP operations

s/Deprecate/remove/ !

> 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 remove this interface.

It does seem a bit sudden.  We could just add a "this interface is
scheduled for removal" warning, then delete the code for real later in
the year.  To give people time to migrate or to complain to us.