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Date: Tue, 16 Dec 2008 11:57:17 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com, npiggin@suse.de,
       hugh@veritas.com, rdreier@cisco.com, jbarnes@virtuousgeek.org,
       jeremy@goop.org, arjan@infradead.org, linux-kernel@vger.kernel.org,
       venkatesh.pallipadi@intel.com, suresh.b.siddha@intel.com
Subject: Re: [patch 4/8] x86 PAT: hooks in generic vm code to help archs to
 track pfnmap regions
Message-Id: <20081216115717.9f7082c7.akpm@linux-foundation.org>
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On Wed, 12 Nov 2008 13:26:51 -0800
Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> wrote:

> --- tip.orig/mm/memory.c	2008-11-11 10:10:11.000000000 -0800
> +++ tip/mm/memory.c	2008-11-11 12:10:18.000000000 -0800
> @@ -99,6 +99,28 @@ int randomize_va_space __read_mostly =
>  					2;
>  #endif
>  
> +#ifndef track_pfn_vma_new
> +int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
> +			unsigned long pfn, unsigned long size)
> +{
> +	return 0;
> +}
> +#endif
> +
> +#ifndef track_pfn_vma_copy
> +int track_pfn_vma_copy(struct vm_area_struct *vma)
> +{
> +	return 0;
> +}
> +#endif
> +
> +#ifndef untrack_pfn_vma
> +void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
> +			unsigned long size)
> +{
> +}
> +#endif

Using __weak would provide a somewhat neater result here.