linux-kernel - Re: [patch] paravirt: VDSO page is essential

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Message-ID: <20070305145847.GH22829@bingen.suse.de>
Date:	Mon, 5 Mar 2007 15:58:47 +0100
From:	Andi Kleen <ak@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <ak@...e.de>, Avi Kivity <avi@...ranet.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Roland McGrath <roland@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch] paravirt: VDSO page is essential

On Mon, Mar 05, 2007 at 02:48:54PM +0100, Ingo Molnar wrote:
> 
> * Andi Kleen <ak@...e.de> wrote:
> 
> > The problem is not the syscall instruction, but some problem with the 
> > way the vDSO mapping is set up with CONFIG_PARAVIRT that broke older 
> > glibc.
> 
> the problem is that CONFIG_PARAVIRT silently turns off 
> CONFIG_COMPAT_VDSO, which of course breaks 'old' glibc. This too is a 
> must-have fix for v2.6.21.

We seem to have different definitions of must-have.

I think we would need to have a paravirt ops callback to decide this
first. But it doesn't look critical to me anyways.

-Andi
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