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

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Date:	Thu, 24 Apr 2014 13:22:08 +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 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));
  ^

David
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