linux-kernel - Re: preempt bug in set_pmd

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Date:	Wed, 5 Mar 2008 01:16:45 +0100
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: preempt bug in set_pmd_pfn?

On Wednesday 05 March 2008 01:07:11 Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> >> Won't this leave a stale tlb on the old processor?
> >>     
> >
> > __set_fixmap should be only used in early boot, so it's always
> > on CPU 0
> 
> vdso32-setup.c:map_compat_vdso() uses it to create the compat vdso 
> mapping, which typically happens on the first execve(),

First execve for 32bit binaries?

Anyways __set_fixmap is __init and at the first  execve (unless you have initramfs) 
init.text should be already freed.

-Andi
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