linux-kernel - Re: [PATCH v3 5/5] mem-hotplug: Introduce movablenode boot option to control memblock allocation direction.

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Message-ID: <20130923171108.GG14547@htj.dyndns.org>
Date:	Mon, 23 Sep 2013 13:11:08 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	Tang Chen <tangchen@...fujitsu.com>, rjw@...k.pl, lenb@...nel.org,
	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, toshi.kani@...com,
	zhangyanfei@...fujitsu.com, liwanp@...ux.vnet.ibm.com,
	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, 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 v3 5/5] mem-hotplug: Introduce movablenode boot option to
 control memblock allocation direction.

Hello,

On Tue, Sep 24, 2013 at 12:58:03AM +0800, Zhang Yanfei wrote:
> you mean we define memblock_set_bottom_up and memblock_bottom_up like below:
> 
> #ifdef CONFIG_MOVABLE_NODE
> void memblock_set_bottom_up(bool enable)
> {
>         /* do something */
> }
> 
> bool memblock_bottom_up()
> {
>         return  direction == bottom_up;
> }
> #else
> void memblock_set_bottom_up(bool enable)
> {
>         /* empty */
> }
> 
> bool memblock_bottom_up()
> {
>         return false;
> }
> #endif
> 
> right?

Yeah, the compiler would be able to drop bottom_up code if
!MOVABLE_NODE as long as the implementation functions are static.

Thanks.

-- 
tejun
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