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Subject: Re: [PATCH] csky: Fixup calltrace panic
To:     Guo Ren <ren_guo@c-sky.com>,
        =?UTF-8?B?556/5LuZ5re8?= <xianmiao_qu@c-sky.com>,
        =?UTF-8?B?5bCa5LqR5rW3?= <yunhai_shang@c-sky.com>
Cc:     Guo Ren <guoren@linux.alibaba.com>, linux-csky@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <20200517175220.GA48379@roeck-us.net>
 <D93AFA5B-3BF1-4E11-B278-22E980C3EE36@c-sky.com>
From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <45e1a784-f8fe-5f17-45ca-3eb5453d4bb4@roeck-us.net>
Date:   Thu, 21 May 2020 07:46:03 -0700
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On 5/20/20 12:50 AM, Guo Ren wrote:
> Hi Guenter,
> 
>> ?? 2020??5??18?գ?????1:52??Guenter Roeck <linux@roeck-us.net> д????
>>
>> Hi,
>>
>> On Wed, May 13, 2020 at 03:15:25PM +0800, Guo Ren wrote:
>>> The implementation of show_stack will panic with wrong fp:
>>>
>>> addr    = *fp++;
>>>
>>> because the fp isn't checked properly.
>>>
>>> The current implementations of show_stack, wchan and stack_trace
>>> haven't been designed properly, so just deprecate them.
>>>
>>> This patch is a reference to riscv's way, all codes are modified from
>>> arm's. The patch is passed with:
>>>
>>> - cat /proc/<pid>/stack
>>> - cat /proc/<pid>/wchan
>>> - echo c > /proc/sysrq-trigger
>>>
>>> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
>>
>> This patch results in:
>>
>> gcc version: csky-linux-gcc (GCC) 9.3.0
>>
>> Building csky:defconfig ... failed
>> --------------
>> Error log:
>> csky-linux-gcc: error: unrecognized command line option '-mbacktrace'; did you mean '-fbacktrace'?
>> csky-linux-gcc: error: unrecognized command line option '-mbacktrace'; did you mean '-fbacktrace'?
>> make[2]: *** [scripts/mod/devicetable-offsets.s] Error 1
>> make[2]: *** Waiting for unfinished jobs....
>> csky-linux-gcc: error: unrecognized command line option '-mbacktrace'; did you mean '-fbacktrace'?
>> make[2]: *** [scripts/mod/empty.o] Error 1
>> make[1]: *** [prepare0] Error 2
>> make: *** [sub-make] Error 2
>>
>> when trying to build csky images with upstream gcc 9.3.0.
>>
>> What version of gcc is needed to build csky images ? Also, would it be
>> possible to support the upstream version of gcc ?
>>
> 
> We tested it with https://github.com/c-sky/gcc (gcc-6.3)
> 

That won't work for me. You really might want to consider
supporting upstream gcc. I'll try disabling CONFIG_STACKTRACE
for csky build tests. If that doesn't work, I may have to
disable affected csky build tests for the time being.

Guenter