linux-kernel - Re: [PATCH 14/21] x86, acpi, numa: Reserve hotpluggable memory at early time.

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Message-ID: <20130723205557.GS21100@mtj.dyndns.org>
Date:	Tue, 23 Jul 2013 16:55:57 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, trenn@...e.de, yinghai@...nel.org,
	jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 14/21] x86, acpi, numa: Reserve hotpluggable memory at
 early time.

On Fri, Jul 19, 2013 at 03:59:27PM +0800, Tang Chen wrote:
> +		/*
> +		 * In such an early time, we don't have nid. We specify pxm
> +		 * instead of MAX_NUMNODES to prevent memblock merging regions
> +		 * on different nodes. And later modify pxm to nid when nid is
> +		 * mapped so that we can arrange ZONE_MOVABLE on different
> +		 * nodes.
> +		 */
> +		memblock_reserve_hotpluggable(base_address, length, pxm);

This is rather hacky.  Why not just introduce MEMBLOCK_NO_MERGE flag?

-- 
tejun
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