Message-ID: <513787BB.4040504@linux.vnet.ibm.com>
Date: Wed, 06 Mar 2013 10:15:23 -0800
From: Dave Hansen <dave@linux.vnet.ibm.com>
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To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
CC: bp@alien8.de, hpa@linux.intel.com, linux-kernel@vger.kernel.org
Subject: Re: [3.9-rc1 x86] Bug in ioremap code?
References: <201303060041.AIF15342.tJFOHLQFFOMVSO@I-love.SAKURA.ne.jp> <20130305180650.GD4914@pd.tnic> <201303060628.CBG00578.OJtMFFHLQVSFOO@I-love.SAKURA.ne.jp> <51367104.5050200@linux.vnet.ibm.com>	<20130305224432.GD27022@pd.tnic> <201303062358.EFG90616.HLtSQFJFOMVOFO@I-love.SAKURA.ne.jp> <5137822F.2030501@linux.vnet.ibm.com>
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Does anybody know what this business is in __cpa_process_fault()?

>         /*
>          * Ignore the NULL PTE for kernel identity mapping, as it is expected
>          * to have holes.
>          * Also set numpages to '1' indicating that we processed cpa req for
>          * one virtual address page and its pfn. TBD: numpages can be set based
>          * on the initial value and the level returned by lookup_address().
>          */

If this is expecting the identity mapping to have holes, then the
BUG_ON() is wrong.  But how would it _get_ holes?

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