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Date: Mon, 11 Nov 2013 09:01:04 +0100
From: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
	<u.kleine-koenig@pengutronix.de>
To: Axel Lin <axel.lin@ingics.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>, Michal Marek <mmarek@suse.cz>,
        Ming Lei <tom.leiming@gmail.com>,
        Russell King <linux@arm.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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Subject: Re: kernel BUG at kernel/kallsyms.c:222!
Message-ID: <20131111080104.GH14892@pengutronix.de>
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Hello,

On Mon, Nov 11, 2013 at 02:43:28PM +0800, Axel Lin wrote:
> 2013/11/11 Rusty Russell <rusty@rustcorp.com.au>:
> > Ming Lei <tom.leiming@gmail.com> writes:
> I don't have other noMMU platform to test.
> But I think this issue impacts various !CONFIG_MMU platforms:
> We have CONFIG_PAGE_OFFSET=0xC0000000 in various default configs.
> For !CONFIG_MMU case, it just don't use the CONFIG_PAGE_OFFSET setting.
> So use CONFIG_PAGE_OFFSET to filter symbols looks wrong to me for all
> !CONFIG_MMU cases.
I don't know what the original problem is, but for my Cortex-M3 machine
(ie. !MMU) I also have CONFIG_PAGE_OFFSET=0xC0000000. Didn't see this
resulting in any problems although the value looks bogus. (The range
0x90000000-0xdfffffff is reserved on my SoC. Trying to read from there
with the debugger fails with a message "Could not read memory.")

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |