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Re: [PATCH] MIPS: Octeon: Select CONFIG_HOLES_IN_ZONE

To: Jason Kwon <jason.kwon@ericsson.com>
Subject: Re: [PATCH] MIPS: Octeon: Select CONFIG_HOLES_IN_ZONE
From: Ralf Baechle <ralf@linux-mips.org>
Date: Sat, 20 Aug 2011 00:18:30 +0100
Cc: Guenter Roeck <guenter.roeck@ericsson.com>, David Daney <david.daney@cavium.com>, "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
In-reply-to: <4E4ED4F5.2050002@ericsson.com>
References: <1313779440-12522-1-git-send-email-david.daney@cavium.com> <1313781191.3235.96.camel@groeck-laptop> <4E4ED4F5.2050002@ericsson.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Aug 19, 2011 at 02:26:13PM -0700, Jason Kwon wrote:
> Date:   Fri, 19 Aug 2011 14:26:13 -0700
> From: Jason Kwon <jason.kwon@ericsson.com>
> To: Guenter Roeck <guenter.roeck@ericsson.com>
> CC: David Daney <david.daney@cavium.com>, "linux-mips@linux-mips.org"
>  <linux-mips@linux-mips.org>, "ralf@linux-mips.org" <ralf@linux-mips.org>
> Subject: Re: [PATCH] MIPS: Octeon: Select CONFIG_HOLES_IN_ZONE
> Content-Type: text/plain; charset="UTF-8"; format=flowed
> 
> On 08/19/2011 12:13 PM, Guenter Roeck wrote:
> >On Fri, 2011-08-19 at 14:44 -0400, David Daney wrote:
> >>Current Octeon systems do in fact have holes in their memory zones.
> >>We need to select HOLES_IN_ZONE.  If we do not, some memory
> >>configurations will result in crashes at boot time like this:
> >>
> >>.
> >>.
> >>.
> >>CPU 6 Unable to handle kernel paging request at virtual address 
> >>0000000000700000, epc == ffffffff8118fe00, ra == ffffffff8118fe9c
> >>Oops[#1]:
> >>Cpu 6
> >>.
> >>.
> >>.
> >>         ...
> >>Call Trace:
> >>[<ffffffff8118fe00>] setup_per_zone_wmarks+0x1b0/0x338
> >>[<ffffffff815cd738>] init_per_zone_wmark_min+0x64/0xd0
> >>[<ffffffff81100438>] do_one_initcall+0x38/0x160
> >>.
> >>.
> >>.
> >>
> >>Reported-by: Jason Kwon<jason.kwon@ericsson.com>
> >>Signed-off-by: David Daney<david.daney@cavium.com>
> >>Cc: Jason Kwon<jason.kwon@ericsson.com>
> >>---
> >>Jason, can you test this patch?
> >>
> >>Ralf, if Jason reports that it fixes his problem, it probably is
> >>needed for 3.0 and 3.1.
> >>
> >Your patch fixes the problem for the board with CN38xx and 2GB RAM that
> >crashed previously.
> >
> >Tested-by: Guenter Roeck<guenter.roeck@ericsson.com>
> >
> >Thanks a lot for looking into this.
> >
> >Guenter
> >
> >
> 
> I applied the patch to 3.0.3 and was able to boot the CN58XX system
> without any memory restrictions.  The same patched kernel booted on
> CN38XX ran into a different problem, which I'm looking into.

Applied.  Thanks, folks!

  Ralf

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