linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Thu, 21 Apr 2011 12:33:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Thu, 21 Apr 2011, KOSAKI Motohiro wrote:

> ia64 and mips have CONFIG_ARCH_POPULATES_NODE_MAP and it initialize
> N_NORMAL_MEMORY automatically if my understand is correct.
> (plz see free_area_init_nodes)
> 

ia64 doesn't enable CONFIG_HIGHMEM, so it never gets set via this generic 
code; mips also doesn't enable it for all configs even for 32-bit.

So we'll either want to take check_for_regular_memory() out from under 
CONFIG_HIGHMEM and do it for all configs or teach slub to use 
N_HIGH_MEMORY rather than N_NORMAL_MEMORY.
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