linux-kernel - Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1)

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Message-ID: <4B46BC6F.5060607@kernel.org>
Date:	Thu, 07 Jan 2010 21:02:39 -0800
From:	"H. Peter Anvin" <hpa@...nel.org>
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>,
	"Wu, Fengguang" <fengguang.wu@...el.com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem
 for 64-bit kernel(v1)

On 01/07/2010 07:32 PM, Zheng, Shaohui wrote:
> Resend the patch to the mailing-list, the original patch URL is 
> http://patchwork.kernel.org/patch/69075/, it is not accepted without comments,
> sent it again to review.
> 
> Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel
> 
> The new added memory can not be access by interface /dev/mem, because we do not
>  update the variable high_memory. This patch add a new e820 entry in e820 table,
>  and update max_pfn, max_low_pfn and high_memory.
> 
> We add a function update_pfn in file arch/x86/mm/init.c to udpate these
>  varibles. Memory hotplug does not make sense on 32-bit kernel, so we did not
>  concern it in this function.
> 

Memory hotplug makes sense on 32-bit kernels, at least in virtual
environments.

	-hpa
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