linux-kernel - Re: [patch 4/4] prctl: PR_SET_MM -- Introduce PR_SET_MM

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Message-Id: <20140822134628.5df9cda87d744e35d794b5c2@linux-foundation.org>
Date:	Fri, 22 Aug 2014 13:46:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-kernel@...r.kernel.org, keescook@...omium.org, tj@...nel.org,
	avagin@...nvz.org, ebiederm@...ssion.com, hpa@...or.com,
	serge.hallyn@...onical.com, xemul@...allels.com,
	segoon@...nwall.com, kamezawa.hiroyu@...fujitsu.com,
	mtk.manpages@...il.com, jln@...gle.com
Subject: Re: [patch 4/4] prctl: PR_SET_MM -- Introduce PR_SET_MM_MAP
 operation, v3

On Sat, 23 Aug 2014 00:38:09 +0400 Cyrill Gorcunov <gorcunov@...il.com> wrote:

> > 
> > Or will we?  What happens if we later decide that some additional field
> > needs to be added?  Do we version the interface?  Add a new prctl()
> > mode?  Let's cook up a plan for that and at least add to changelog?
> 
> I don't expect to change it anytime soon but we still have an option --
> if we decide to extend or shrink it we always can use sizeof/offsetof
> helpers to check which exactly version userspace asks us to use.

How does that work?  We just have a blob of bytes coming in from
userspace.

> As far as I understand the mm_struct is not the structure which
> changes that frequently, right?

We might find existing things which criu wants to access.  And criu
lives forever, yes?  The mm_struct is likely to change over that time
period ;)
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