linux-kernel - Re: kernel BUG at kernel/kallsyms.c:222!

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Message-ID: <CACVXFVPQfUtrc4r4cS9J+6q5Z6hGZDgafH=M_6JfrzrAUGJOHw@mail.gmail.com>
Date:	Tue, 12 Nov 2013 11:22:44 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jonathan Austin <jonathan.austin@....com>,
	Michal Marek <mmarek@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Axel Lin <axel.lin@...ics.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: kernel BUG at kernel/kallsyms.c:222!

On Tue, Nov 12, 2013 at 3:32 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Mon, Nov 11, 2013 at 05:15:29PM +0000, Jonathan Austin wrote:
>> I've tested the patch below and it solves the ARM side of things - so
>> gives you an option other than a complete revert. Happy to put this in to
>> RMK's patch system if you'd prefer not to have to revert and he's happy
>> with the patch.
>
> I think this is the right solution because it then means that this symbol
> has the same meaning whether on MMU or !MMU - and getting rid of these
> kinds of gratuitous variances are the only way that !MMU is going to
> become less fragile.

The patch only fixes problem on arm, and other !MMU&&!ARM archs
should be affected too.

Also there is no CONFIG_PAGE_OFFSET defined for some ARCHs,
such as 64bit ARCHs.

Currently, I suggest to filter only on ARM as attachment patch if we plan
to merge Jonathan's patch, otherwise a more complicated approach has
to be figured out  to do the filter(such as, define a readonly symbol in
kernel to store PAGE_OFFSET, and let scripts/kallsyms use it for
filtering).



Thanks,
-- 
Ming Lei

View attachment "filter-only-on-arm.patch" of type "text/x-patch" (531 bytes)