linux-kernel - Re: [PATCH] ARM: mm: Regarding section when dealing with meminfo

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Date:	Mon, 24 Jan 2011 10:47:37 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	KyongHo Cho <pullip.cho@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	KeyYoung Park <keyyoung.park@...sung.com>,
	linux-kernel@...r.kernel.org, Ilho Lee <ilho215.lee@...sung.com>,
	linux-mm@...ck.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: mm: Regarding section when dealing with meminfo

On Mon, 2011-01-24 at 17:58 +0000, Russell King - ARM Linux wrote:
> Wrong.  For flatmem, we have a pfn_valid() which is backed by doing a
> one, two or maybe rarely three compare search of the memblocks.  Short
> of having a bitmap of every page in the 4GB memory space, you can't
> get more efficient than that.

Sweet.  So, we can just take the original patch that started this
conversation, add the requisite pfn_valid()s and pfn_to_page()s, and
skip the sparsemem #ifdefs.  Right?

-- Dave

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