linux-kernel - stacktrace.c:undefined reference to `save_stack

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Date:   Sun, 1 Dec 2019 14:18:31 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Chenwandun <chenwandun@...wei.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dave Airlie <airlied@...hat.com>, Lyude Paul <lyude@...hat.com>
Subject: stacktrace.c:undefined reference to `save_stack_trace'

Hi Chenwandun,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b94ae8ad9fe79da61231999f347f79645b909bda
commit: 68acde7629d75d460760a3124c52f358eecc6d26 drm/dp_mst: fix gcc compile error
date:   4 weeks ago
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 68acde7629d75d460760a3124c52f358eecc6d26
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/stacktrace.o: In function `stack_trace_save':
>> stacktrace.c:(.text+0x120): undefined reference to `save_stack_trace'

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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