linux-kernel - Re: [PATCH] arm/xen: Remove definiition of virt_to

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Date:	Fri, 25 Apr 2014 18:05:41 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Julien Grall <julien.grall@...aro.org>,
	<stefano.stabellini@...citrix.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<ian.campbell@...rix.com>, <konrad.wilk@...cle.com>
Subject: Re: [PATCH] arm/xen: Remove definiition of virt_to_pfn in
 asm/xen/page.h

On Thu, 24 Apr 2014, David Vrabel wrote:
> On 24/04/14 13:49, Julien Grall wrote:
> > Hi David,
> > 
> > On 04/24/2014 01:22 PM, David Vrabel wrote:
> >> On 18/04/14 16:54, Julien Grall wrote:
> >>> virt_to_pfn has been defined in asm/memory.h by the commit e26a9e0 "ARM: Better
> >>> virt_to_page() handling"
> >>>
> >>> This will result of a compilation warning when CONFIG_XEN is enabled.
> >>>
> >>> arch/arm/include/asm/xen/page.h:80:0: warning: "virt_to_pfn" redefined [enabled by default]
> >>>  #define virt_to_pfn(v)          (PFN_DOWN(__pa(v)))
> >>>  ^
> >>> In file included from arch/arm/include/asm/page.h:163:0,
> >>>                  from arch/arm/include/asm/xen/page.h:4,
> >>>                  from include/xen/page.h:4,
> >>>                  from arch/arm/xen/grant-table.c:33:
> >>>
> >>> The definition in memory.h is nearly the same (it directly expand PFN_DOWN),
> >>> so we can safely drop virt_to_pfn in xen include.
> >>
> >>
> >> This breaks the arm build for me.
> >>
> >> /local/davidvr/work/k.org/tip/drivers/block/xen-blkfront.c: In function
> >> ‘setup_blkring’:
> >> /local/davidvr/work/k.org/tip/drivers/block/xen-blkfront.c:1236:2:
> >> error: implicit declaration of function ‘virt_to_pfn’
> >> [-Werror=implicit-function-declaration]
> >>   err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
> >>   ^
> > 
> > I don't have any issue to build the following branch with this patch on:
> > 	- v3.15-rc2
> > 	- xentip master
> > 	- xentip for-linus-3.16
> 
> Applied to devel/for-linus-3.16.
> 
> If something else turns up for 3.15 (and I remember) I'll take it for
> 3.15 instead.

David,
thank you very much for taking the patch in my absence.

Considering that the problem is affecting everybody enabling CONFIG_XEN
on ARM on v3.15, I don't think we can wait for the next merge window to
send this fix upstream.
Too many warnings for too many people.

Cheers,

Stefano