linux-kernel - Re: [ RESEND PATCH v3] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel

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Message-Id: <20100112175724.adfa04d6.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 12 Jan 2010 17:57:24 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Zheng, Shaohui" <shaohui.zheng@...el.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"y-goto@...fujitsu.com" <y-goto@...fujitsu.com>,
	Dave Hansen <haveblue@...ibm.com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [ RESEND PATCH v3] Memory-Hotplug: Fix the bug on interface
 /dev/mem for 64-bit kernel

On Tue, 12 Jan 2010 16:57:40 +0800
"Zheng, Shaohui" <shaohui.zheng@...el.com> wrote:

> 
> 3 points...
> 1. I think this patch cannot be compiled in archs other than x86. Right ?
>    IOW, please add static inline dummy...
> [Zheng, Shaohui] Agree, I will add a static dummy function
> 
> 2. pgdat->[start,end], totalram_pages etc...are updated at memory hotplug.
>    Please place the hook nearby them.
> [Zheng, Shaohui] Agree.
> 
> 3. I recommend you yo use memory hotplug notifier.
>    If it's allowed, it will be cleaner.
>    It seems there are no strict ordering to update parameters this patch touches.
> 
> [Zheng, Shaohui] Kame, do you means put the hook into function slab_mem_going_online_callback, it seems a good idea. If we select this method, we will need not to update these variable in function add_memory explicitly.
> 
yes. I think callback is the best.

Thanks,
-Kame

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