linux-kernel - Re: mmots: memory-hotplug: implement register_page_bootmem_info

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Message-ID: <50F00041.2040305@cn.fujitsu.com>
Date:	Fri, 11 Jan 2013 20:06:25 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Wu Jianguo <wujianguo@...wei.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmots: memory-hotplug: implement register_page_bootmem_info_section
 of sparse-vmemmap fix

On 01/11/2013 06:47 PM, Michal Hocko wrote:
>>
>> Darn! And now that I am looking at the patch closer it is too x86
>> centric so this cannot be in the generic code. I will try to cook
>> something better. Sorry about the noise.
>
> It is more complicated than I thought. One would tell it's a mess.
> The patch bellow fixes the compilation issue but I am not sure we want
> to include memory_hotplug.h into arch/x86/mm/init_64.c. Moreover
>
> +void register_page_bootmem_memmap(unsigned long section_nr,
> +				  struct page *start_page, unsigned long size)
> +{
> +	/* TODO */
> +}
>
> for other archs would suggest that the code is not ready yet. Should
> this rather be dropped for now?

Hi Michal,

Do you mean remove register_page_bootmem_memmap() from other
architectures ?  Well, I think this function is called by
register_page_bootmem_info_section(), which is a common function
in mm/memory_hotplug.c shared by all architectures. So I don't think
we should remove it. :)

Thanks. :)

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