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: <20100114140815.GA18580@localhost>
Date:	Thu, 14 Jan 2010 22:08:15 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"Zheng, Shaohui" <shaohui.zheng@...el.com>,
	"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

> > 2. pgdat->[start,end], totalram_pages etc...are updated at memory hotplug.
> >    Please place the hook nearby them.
> 
> arch/x86/mm/init_64.c:arch_add_memory() updates max_pfn_mapped, in
> this sense it's equally OK to update max_pfn/max_low_pfn etc before
> the call to arch_add_memory() ;)

Shaohui, I'd suggest to update max_pfn/max_low_pfn/high_memory in
arch/x86/mm/init_64.c:arch_add_memory() now, for X86_64.

Later on we can add code to arch/x86/mm/init_32.c:arch_add_memory()
for X86_32.

The code cannot be shared anyway.

Thanks,
Fengguang
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