linux-kernel - Re: [3.9-rc1 x86] Bug in ioremap code?

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Message-ID: <513787BB.4040504@linux.vnet.ibm.com>
Date:	Wed, 06 Mar 2013 10:15:23 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
CC:	bp@...en8.de, hpa@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [3.9-rc1 x86] Bug in ioremap code?

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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