linux-kernel - Re: [PATCH 08/24] xen/arm: Introduce xen_pfn

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Date:	Wed, 1 Aug 2012 16:50:59 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"Tim (Xen.org)" <tim@....org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH 08/24] xen/arm: Introduce xen_pfn_t for pfn and mfn
 types

On Wed, 1 Aug 2012, Konrad Rzeszutek Wilk wrote:
> On Thu, Jul 26, 2012 at 04:33:50PM +0100, Stefano Stabellini wrote:
> > All the original Xen headers have xen_pfn_t as mfn and pfn type, however
> > when they have been imported in Linux, xen_pfn_t has been replaced with
> > unsigned long. That might work for x86 and ia64 but it does not for arm.
> 
> How come?

see below

> > Bring back xen_pfn_t and let each architecture define xen_pfn_t as they
> > see fit.
> 
> I am OK with this as long as your include a comment in both of the
> interface.h saying why this is needed. I am curious why 'unsinged long'
> won't work? Is it b/c on ARM you always want a 64-bit type?

Yes, we would like to make the same interface work for 32 and 64
bit guests, without any need for a "compat layer" as we currently have
on x86.
In fact I am going to add another patch to explicitly size all the
other unsigned long that we have in the public interface.
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