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Date: Tue, 6 Apr 2010 23:08:17 +0100
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH] arm: mm: Don't free prohibited memmap entries
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To: Michael Bohan <mbohan@codeaurora.org>
Cc: mel@csn.ul.ie, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Michael Bohan <mbohan@quicinc.com>

On Mon, Apr 05, 2010 at 03:34:21PM -0700, Michael Bohan wrote:
> From: Michael Bohan <mbohan@quicinc.com>
> 
> The VM subsystem assumes that there are valid memmap entries to
> the bank end aligned to MAX_ORDER_NR_PAGES. It will try and read
> these page structs, and so we cannot free any memmap entries that
> it may inspect.

1. are you enabling ARCH_HAS_HOLES_MEMORYMODEL ?
2. where does it try to access these page structs without trying
   pfn_valid() to check whether a page struct exists first?