netdev - Re: [PATCH] xen: drop anti-dependency on X86

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Message-ID: <4D9DFD6A.1060200@goop.org>
Date:	Thu, 07 Apr 2011 11:07:38 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ian Campbell <Ian.Campbell@...citrix.com>
CC:	David Miller <davem@...emloft.net>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"mirq-linux@...e.qmqm.pl" <mirq-linux@...e.qmqm.pl>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-visws-devel@...ts.sf.net" <linux-visws-devel@...ts.sf.net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"pazke@...pac.ru" <pazke@...pac.ru>,
	"mingo@...hat.com" <mingo@...hat.com>
Subject: Re: [PATCH] xen: drop anti-dependency on X86_VISWS

On 04/06/2011 11:58 PM, Ian Campbell wrote:
> On Wed, 2011-04-06 at 22:45 +0100, David Miller wrote:
>> From: Ian Campbell <Ian.Campbell@...citrix.com>
>> Date: Mon, 4 Apr 2011 10:55:55 +0100
>>
>>> You mean the "!X86_VISWS" I presume? It doesn't make sense to me either.
>> No, I think 32-bit x86 allmodconfig elides XEN because of it's X86_TSC dependency.
> TSC is a real dependency of the Xen interfaces.

Not really.  The TSC register is a requirement, but that's going to be
present on any CPU which can boot Xen.  We don't need any of the
kernel's TSC machinery though.

    J
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