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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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