linux-kernel - Re: [rfc 3/3] prctl: Add PR_SET_MM codes to tune up mm

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Message-Id: <20111207231512.519385bb.akpm@linux-foundation.org>
Date:	Wed, 7 Dec 2011 23:15:12 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [rfc 3/3] prctl: Add PR_SET_MM codes to tune up mm_struct
 entires

On Thu, 8 Dec 2011 11:07:24 +0400 Cyrill Gorcunov <gorcunov@...il.com> wrote:

> > 
> > The prctl(2) manpage will need to be updated.  Please Cc Michael on all
> > such changes.
> >
> 
> you mean -- Michael Kerrisk, mtk AT man7.org, right?

That isn't what ./MAINTAINERS says?

> > 
> > This is starting to add a non-trivial amount of code.  Perhaps we need
> > to introduce a Kconfig variable to control such things as this, to
> > prevent bloating up kernels which aren't require to support c/r?
> > 
> 
> Dunno, Andrew. Actually I agreed that these snippets are mostly
> needed for c/r only, but the initial idea over all changes was
> to add levers into kernel which might be helpful not only
> for c/r but for someone else as well.

In each instance, a case would need to be made for that.  Plus if
people later come along who want access to these things for other
purposes, they can send a patch!

There will always be people who would *prefer* that this material not
be present in their vmlinux.  For those people, this patch is a
regression!


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