linux-kernel - Re: [PATCH v2] mm/hotplug: Verify hotplug memory range

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Date:	Mon, 12 Aug 2013 08:49:28 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, dave@...1.net,
	isimatu.yasuaki@...fujitsu.com, tangchen@...fujitsu.com,
	vasilis.liaskovitis@...fitbricks.com
Subject: Re: [PATCH v2] mm/hotplug: Verify hotplug memory range

On Mon, 2013-08-12 at 07:37 +0800, Wanpeng Li wrote:
> On Sat, Aug 10, 2013 at 01:17:32PM -0600, Toshi Kani wrote:
> >add_memory() and remove_memory() can only handle a memory range aligned
> >with section.  There are problems when an unaligned range is added and
> >then deleted as follows:
> >
> > - add_memory() with an unaligned range succeeds, but __add_pages()
> >   called from add_memory() adds a whole section of pages even though
> >   a given memory range is less than the section size.
> > - remove_memory() to the added unaligned range hits BUG_ON() in
> >   __remove_pages().
> >
> >This patch changes add_memory() and remove_memory() to check if a given
> >memory range is aligned with section at the beginning.  As the result,
> >add_memory() fails with -EINVAL when a given range is unaligned, and
> >does not add such memory range.  This prevents remove_memory() to be
> >called with an unaligned range as well.  Note that remove_memory() has
> >to use BUG_ON() since this function cannot fail.
> >
> >Signed-off-by: Toshi Kani <toshi.kani@...com>
> >Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> >Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
> 
> Reviewed-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Thanks Wanpeng!
-Toshi

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