linux-kernel - Re: [PATCH] memory hotplug: avoid double registration on ia64 platform

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Date:	Fri, 17 Aug 2012 06:24:10 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	qiuxishi <qiuxishi@...il.com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, tony.luck@...el.com,
	yinghai@...nel.org, jiang.liu@...wei.com, qiuxishi@...wei.com,
	bessel.wang@...wei.com, wujianguo@...wei.com,
	paul.gortmaker@...driver.com, kamezawa.hiroyu@...fujitsu.com,
	kosaki.motohiro@...fujitsu.com, rientjes@...gle.com,
	minchan@...nel.org, chenkeping@...wei.com, linux-mm@...ck.org,
	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	liuj97@...il.com
Subject: Re: [PATCH] memory hotplug: avoid double registration on ia64
 platform

On Fri, Aug 17, 2012 at 03:52:47PM +0800, qiuxishi wrote:
> From: Xishi Qiu <qiuxishi@...wei.com>
> 
> Hi all,
> There may be have a bug when register section info. For example, on
> an Itanium platform, the pfn range of node0 includes the other nodes.
> So when hot remove memory, we can't free the memmap's page because
> page_count() is 2 after put_page_bootmem().
> 
> sparse_remove_one_section()->free_section_usemap()->free_map_bootmem()
> ->put_page_bootmem()
> 
> pgdat0: start_pfn=0x100,    spanned_pfn=0x20fb00, present_pfn=0x7f8a3, => 0x100-0x20fc00
> pgdat1: start_pfn=0x80000,  spanned_pfn=0x80000,  present_pfn=0x80000, => 0x80000-0x100000
> pgdat2: start_pfn=0x100000, spanned_pfn=0x80000,  present_pfn=0x80000, => 0x100000-0x180000
> pgdat3: start_pfn=0x180000, spanned_pfn=0x80000,  present_pfn=0x80000, => 0x180000-0x200000
> 
> 
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>  mm/memory_hotplug.c |   10 ++++------
>  1 files changed, 4 insertions(+), 6 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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