From: Chandru <chandru@in.ibm.com>
Organization: ibm
To: Dave Hansen <dave@linux.vnet.ibm.com>
Subject: Re: 2.6.28-rc9 panics with crashkernel=256M while booting
Date: Thu, 15 Jan 2009 13:35:27 +0530
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Cc: Paul Mackerras <paulus@samba.org>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       linuxppc-dev@ozlabs.org,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>
References: <200812241325.49404.chandru@in.ibm.com> <1231444992.23462.138.camel@nimitz> <200901091637.24658.chandru@in.ibm.com>
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On Friday 09 January 2009 16:37:24 Chandru wrote:
> On Friday 09 January 2009 01:33:12 Dave Hansen wrote:
> > Now I'm even more confused.  Could you please send a fully changelogged
> > patch that describes the problem, and how this fixes it?  This just
> > seems like an off-by-one error, which isn't what I thought we had before
> > at all.
> > 
> > I'm also horribly confused why PFN_UP is needed here.  Is 'physbase' not
> > page aligned?  reserve_size looks like it *has* to be.  'end_pfn' is
> > always (as far as I have ever seen in the kernel) the pfn of the page
> > after the area we are interested in and we treat it as such in that
> > function.  In the case of an unaligned physbase, that wouldn't be true.
> > 
> > Think of the case where we have a 1-byte reservation.  start_pfn will
> > equal end_pfn and we won't go into that while loop at *all* and won't
> > reserve anything.
> > 
> > Does 'end_pfn' need fixing?
> > 
> 
> Attached is the console log with debug command line parameters enabled and 
> with couple of more debug statements added to the code.  Please take a look at it. 
> 
> thanks,
> Chandru
> 

Hello Dave, From the debug console output, if there is anything you can add here,
pls let me know.

thanks 
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