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

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Message-ID: <CAFRkauDe7V3N0AbfvE_=GEXHZ_Fw62VsA8p50wSUYE1-TRqMfw@mail.gmail.com>
Date:	Thu, 7 Nov 2013 16:36:50 +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>:
> Hi,
>
> On Thu, Nov 7, 2013 at 10:47 AM, Axel Lin <axel.lin@...ics.com> wrote:
>>
>> 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 )
>
> Firstly it can be configured via VMSPLIT_3GVMSPLIT_2G/VMSPLIT_1G.
>
> Secondly, configurable or not isn't the point, and maybe some uclinux
> platforms do not use CONFIG_PAGE_OFFSET at all, but they should
> set it as a reasonable value or at least be below than the start link
> address of vmlinux.

Hi Ming,

I found in arch/arm/include/asm/memory.h:
CONFIG_PAGE_OFFSET is not used if !CONFIG_MMU.
So looks like setting CONFIG_PAGE_OFFSET to other value still won't work.

Thanks,
Axel
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