linux-kernel - Re: [RFC, PATCH] Fixup COMPAT_VDSO to work with CONFIG

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Date:	Fri, 16 Mar 2007 17:31:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Zachary Amsden <zach@...are.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: [RFC, PATCH] Fixup COMPAT_VDSO to work with CONFIG_PARAVIRT


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> > The practical question here is if we already have all of the 
> > relocation logic for the VDSO why do we need to add more?
> 
> The kernel doesn't normally ever relocate the vdso; [...]

that's what is the case right now, but much of the intention behind the 
vma based vDSO is to enable per-process randomized vdso locations, and 
various distributions do that. So the 'modern' vDSO concept is very much 
relocatable.

	Ingo
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