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

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Date:	Thu, 24 Apr 2014 13:49:09 +0100
From:	Julien Grall <julien.grall@...aro.org>
To:	David Vrabel <david.vrabel@...rix.com>
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

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

Regards,

-- 
Julien Grall
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