linux-kernel - Re: [PATCH] mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem

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Message-ID: <20140816130456.GH9305@htj.dyndns.org>
Date:	Sat, 16 Aug 2014 09:04:56 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tang Chen <tangchen@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"H. Peter Anvin" <hpa@...or.com>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mem-hotplug: let memblock skip the hotpluggable memory
 regions in __next_mem_range()

On Mon, Aug 11, 2014 at 09:31:22PM +0800, Xishi Qiu wrote:
> Let memblock skip the hotpluggable memory regions in __next_mem_range(),
> it is used to to prevent memblock from allocating hotpluggable memory 
> for the kernel at early time. The code is the same as __next_mem_range_rev().
> 
> Clear hotpluggable flag before releasing free pages to the buddy allocator.

Please try to explain "why" in addition to "what".  Why do we need to
clear hotpluggable flag in free_low_memory_core_early() in addition to
numa_clear_node_hotplug() in x86 numa.c?  Does this make x86 code
redundant?  If not, why?

-- 
tejun
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