linux-kernel - Re: [PATCH 1/2] clean up for early_pfn_to

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Message-Id: <20090213142032.09b4a4da.akpm@linux-foundation.org>
Date:	Fri, 13 Feb 2009 14:20:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kamezawa.hiroyu@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kosaki.motohiro@...fujitsu.com,
	davem@...emlloft.net, heiko.carstens@...ibm.com, stable@...nel.org
Subject: Re: [PATCH 1/2] clean up for early_pfn_to_nid

On Thu, 12 Feb 2009 16:22:03 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Declaration of early_pfn_to_nid() is scattered over per-arch include files,
> and it seems it's complicated to know when the declaration is used.
> I think it makes fix-for-memmap-init not easy.
> 
> This patch moves all declaration to include/linux/mm.h
> 
> After this,
>   if !CONFIG_NODES_POPULATES_NODE_MAP && !CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
>      -> Use static definition in include/linux/mm.h
>   else if !CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
>      -> Use generic definition in mm/page_alloc.c
>   else
>      -> per-arch back end function will be called.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> ---
>  arch/ia64/include/asm/mmzone.h   |    4 ----
>  arch/ia64/mm/numa.c              |    2 +-
>  arch/x86/include/asm/mmzone_32.h |    2 --
>  arch/x86/include/asm/mmzone_64.h |    2 --
>  arch/x86/mm/numa_64.c            |    2 +-
>  include/linux/mm.h               |   19 ++++++++++++++++---
>  mm/page_alloc.c                  |    8 +++++++-
>  7 files changed, 25 insertions(+), 14 deletions(-)

It's rather unfortunate that this bugfix includes a fair-sized cleanup
patch, because we should backport it into 2.6.28.x.

Oh well.

I queued these as

mm-clean-up-for-early_pfn_to_nid.patch
mm-fix-memmap-init-for-handling-memory-hole.patch

and tagged them as needed-in-2.6.28.x.  I don't recall whether they are
needed in earlier -stable releases?

I don't have a record here of davem having tested these new patches, btw ;)
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