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

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Message-ID: <Pine.LNX.4.64.0806161906490.19564@blonde.site>
Date:	Mon, 16 Jun 2008 19:13:48 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.or>,
	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>,
	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, Linus Torvalds wrote:
> 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>

And seems very reasonable (and exceptionally well described) to me too.

	Acked-by: Hugh Dickins <hugh@...itas.com>
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