linux-kernel - Re: mmotm 2011-06-15-16-56 uploaded (mm/page

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Date:	Fri, 17 Jun 2011 08:55:55 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: mmotm 2011-06-15-16-56 uploaded (mm/page_cgroup.c)

On Thu, Jun 16, 2011 at 11:46:04AM -0700, Dave Hansen wrote:
> On Thu, 2011-06-16 at 17:51 +0100, Mel Gorman wrote:
> > No, why was node_start_pfn() and node_end_pfn() defined optionally
> > on a per-architecture basis?
> 
> Probably because it started in the NUMA-Q port, and we were still trying
> to stay off the radar at that point.  It looks like it showed up in
> ~2.5.[3-4]?.  We didn't know what the heck we were doing back then, and
> it probably leaked out from under CONFIG_NUMA/DISCONTIGMEM at some
> point.
> 
> Seems like a good thing to consolidate to me.  Especially since it's
> just a shortcut to the (unconditionally defined) structure member, I
> can't see a real justification for needing different definitions.
> 

Great. Thanks Dave.

-- 
Mel Gorman
SUSE Labs
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