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

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Message-ID: <53591B8F.8070300@citrix.com>
Date:	Thu, 24 Apr 2014 15:11:27 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...aro.org>
CC:	<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 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.

Thanks.

David
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