linux-kernel - Re: [PATCH 2 of 4] paravirt: add hooks for ptep_modify_prot

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Message-ID: <4843E00C.1080407@goop.org>
Date:	Mon, 02 Jun 2008 12:57:00 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2 of 4] paravirt: add hooks for	ptep_modify_prot_start/commit

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> +#define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
>>     
>
> please turn this into CONFIG_ARCH_HAS_PTEP_MODIFY_PROT_TRANSACTION 
> instead.

The __HAVE_ARCH_ form is consistent with all the other conditional 
things in asm/pgtable.h, like __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS, 
__HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG, etc.  I don't think adding 
CONFIG_ARCH_HAS_ for this one case is a good idea.

    J
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