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

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Message-ID: <20080619164708.GA32190@elte.hu>
Date:	Thu, 19 Jun 2008 18:47:08 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, benh@...nel.crashing.org,
	xen-devel <xen-devel@...ts.xensource.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Hugh Dickins <hugh@...itas.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction
	abstraction


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Thu, 19 Jun 2008, Ingo Molnar wrote:
> > 
> > Below is the commit, it needed a small amount of massaging to apply the 
> > void * -> unsigned long * change in the x86/bitops topic.
> 
> Well, that's your bug right there.
> 
> The macros very much depended on the pointers being "void *", due to 
> the pointer arithmetic (which is a gcc extension that we use 
> extensively - "void *" arithmetic works as if it was a byte pointer).

duh, yeah - of course. Will retry with that fixed :)

	Ingo
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