linux-kernel - Re: [PATCH] csky: Fixup calltrace panic

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Message-ID: <15bbf77c-e0cf-59a5-6abc-9eeae93ccc74@roeck-us.net>
Date:   Fri, 22 May 2020 14:28:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Guo Ren <guoren@...nel.org>
Cc:     Guo Ren <ren_guo@...ky.com>,
        瞿仙淼 <xianmiao_qu@...ky.com>,
        尚云海 <yunhai_shang@...ky.com>,
        Guo Ren <guoren@...ux.alibaba.com>, linux-csky@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] csky: Fixup calltrace panic

On 5/22/20 8:28 AM, Guo Ren wrote:
> Hi,
> 
> On Thu, May 21, 2020 at 10:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>> 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
> 
> Not only CONFIG_STACKTRACE,
> Disable FRAME_POINTER (Kernel hacking -> Compile the kernel with frame pointers)
> 

You are correct. This is what my test builder now does:

Build reference: v5.7-rc6-37-g115a54162a6c
gcc version: csky-linux-gcc (GCC) 9.3.0

Configuration file workarounds:
    "s/CONFIG_FRAME_POINTER=y/# CONFIG_FRAME_POINTER is not set/"

Building csky:defconfig ... passed
Building csky:allnoconfig ... passed
Building csky:tinyconfig ... passed

Guenter