linux-kernel - Re: [tip:x86/urgent] x86: mm: Read cr2 before prefetching the mmap

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Date:	Tue, 16 Jun 2009 10:54:15 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	mingo@...hat.com, hpa@...or.com, mathieu.desnoyers@...ymtl.ca,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	penberg@...helsinki.fi, vegard.nossum@...il.com, npiggin@...e.de,
	jeremy@...p.org, tglx@...utronix.de, hugh.dickins@...cali.co.uk,
	mingo@...e.hu
cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86: mm: Read cr2 before prefetching the
 mmap_lock



On Tue, 16 Jun 2009, tip-bot for Ingo Molnar wrote:
> 
> It turns out that in current upstream we do exactly that:
> 
> 	prefetchw(&mm->mmap_sem);
> 
> 	/* Get the faulting address: */
> 	address = read_cr2();
> 
> This is not good.

Ack.

		Linus
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