Subject: Re: [PATCH] microblaze: Fix pfn_valid() for noMMU
From: "Steven J. Magnani" <steve@digidescorp.com>
Reply-To: steve@digidescorp.com
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Chen Liqin <liqin.chen@sunplusct.com>,
       Lennox Wu <lennox.wu@gmail.com>, David Howells <dhowells@redhat.com>,
       Greg Ungerer <gerg@snapgear.com>
In-Reply-To: <20091116141426.9fc63622.akpm@linux-foundation.org>
References: <1258150109-6884-1-git-send-email-steve@digidescorp.com>
	 <20091116141426.9fc63622.akpm@linux-foundation.org>
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Organization: Digital Design Corporation
Date: Tue, 17 Nov 2009 08:27:54 -0600
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On Mon, 2009-11-16 at 14:14 -0800, Andrew Morton wrote:
> On Fri, 13 Nov 2009 16:08:29 -0600
> steve@digidescorp.com wrote:
> 
> > Configuring DEBUG_SLAB causes a noMMU kernel to die during initialization
> > with an invalid virtual address panic in kfree_debugcheck().
> > The panic is due to an improper definition of pfn_valid().
> > 
> > ...
> Is arch/score/include/asm/page.h buggy also?
> 

I don't believe so, but only because MEMORY_START is defined as zero for
that arch, making min_low_pfn zero.

------------------------------------------------------------------------
 Steven J. Magnani               "I claim this network for MARS!
 www.digidescorp.com              Earthling, return my space modulator!"

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