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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 4/7] proc: export more page flags in /proc/kpageflags
Cc: kosaki.motohiro@jp.fujitsu.com, Minchan Kim <minchan.kim@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, Andi Kleen <andi@firstfloor.org>,
       Matt Mackall <mpm@selenic.com>, Alexey Dobriyan <adobriyan@gmail.com>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>
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Date: Thu,  7 May 2009 11:09:43 +0900 (JST)
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> On Thu, May 07, 2009 at 10:04:31AM +0800, Minchan Kim wrote:
> > 
> > Hi, 
> > 
> > > +#ifdef CONFIG_MEMORY_FAILURE
> > > +	u |= kpf_copy_bit(k, KPF_HWPOISON,	PG_hwpoison);
> > > +#endif
> > 
> > Did mmtom merge memory failure feature?
> 
> Maybe not yet.. but the #ifdef makes it safe :-)

Please don't do that.
dependency of the out of tree code mean "please don't merge me".