linux-kernel - Re: [PATCH 1 of 4] mm: add a ptep_modify

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Message-ID: <alpine.LFD.1.10.0806161028080.2949@woody.linux-foundation.org>
Date:	Mon, 16 Jun 2008 10:29:19 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	x86@...nel.org, xen-devel <xen-devel@...ts.xensource.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hugh Dickins <hugh@...itas.com>,
	Zachary Amsden <zach@...are.com>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction
 abstraction



On Mon, 16 Jun 2008, Jeremy Fitzhardinge wrote:
>
> ptep_modify_prot_start() returns the current pte value, and puts the
>   pte entry into a state where either the hardware will not update the
>   pte, or if it does, the updates will be preserved on commit.
> 
> ptep_modify_prot_commit() writes back the updated pte, makes sure that
>   any hardware updates made since ptep_modify_prot_start() are
>   preserved.

Ok, I'm fine with this now that it's renamed to be clearly about just 
protection bits.

So 

	Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>

for what it's worth.

		Linus
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