linux-kernel - Re: Kernel panic due to page migration accessing memory holes

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Message-ID: <20100218085336.GB848@n2100.arm.linux.org.uk>
Date:	Thu, 18 Feb 2010 08:53:36 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Michael Bohan <mbohan@...eaurora.org>
Cc:	linux-mm@...ck.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: Kernel panic due to page migration accessing memory holes

On Wed, Feb 17, 2010 at 04:45:54PM -0800, Michael Bohan wrote:
> I have encountered a kernel panic on the ARM/msm platform in the mm  
> migration code on 2.6.29.  My memory configuration has two discontiguous  
> banks per our ATAG definition.   These banks end up on addresses that  
> are 1 MB aligned.  I am using FLATMEM (not SPARSEMEM), but my  
> understanding is that SPARSEMEM should not be necessary to support this  
> configuration.  Please correct me if I'm wrong.

Make sure you have ARCH_HAS_HOLES_MEMORYMODEL enabled.
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