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

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Message-ID: <CAFRkauAdR3=ByE0_B3OsqOBjmbz2a02EXb+6g-vn=1TJ7AZc8Q@mail.gmail.com>
Date:	Thu, 7 Nov 2013 10:47:24 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Russell King <linux@....linux.org.uk>,
	Michal Marek <mmarek@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: kernel BUG at kernel/kallsyms.c:222!

2013/11/7 Ming Lei <tom.leiming@...il.com>:
> On Thu, Nov 7, 2013 at 10:18 AM, Axel Lin <axel.lin@...ics.com> wrote:
>> 2013/11/7 Ming Lei <tom.leiming@...il.com>:
>>> Could you share what is the value of CONFIG_PAGE_OFFSET
>>> on your noMMU platform?
>>
>> $ grep  CONFIG_PAGE_OFFSET .config
>> CONFIG_PAGE_OFFSET=0xC0000000
>
> It seems that the PAGE_OFFSET is _not_ the start of kernel memory
> in linear address space on your platform, I think it may not be a correct
> usage, even for uClinux.

hi Ming,
Seems CONFIG_PAGE_OFFSET is not configurabe in "make menuconfig".
And I found CONFIG_PAGE_OFFSET=0xC0000000 for all below configs...
$ make at91_dt_defconfig; grep  CONFIG_PAGE_OFFSET .config
$ make ep93xx_defconfig; grep  CONFIG_PAGE_OFFSET .config
$ make imx_v4_v5_defconfig; grep CONFIG_PAGE_OFFSET .config
$ make mxs_defconfig; grep CONFIG_PAGE_OFFSET .config
$ make omap2plus_defconfig; grep CONFIG_PAGE_OFFSET .config
$ make s3c6400_defconfig; grep CONFIG_PAGE_OFFSET .config
$ make at91x40_defconfig; grep CONFIG_PAGE_OFFSET .config
( at91x40_defconfig is also arm7tdmi )

Regards,
Axel
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