[drm-intel:topic/core-for-CI 9/9] slub.c:undefined reference to `save_stack_trace'

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel topic/core-for-CI
head:   1bb5f7fce1fe95fb9a9a9a23845b286ca47c9ed6
commit: 1bb5f7fce1fe95fb9a9a9a23845b286ca47c9ed6 [9/9] RFC: debugobjects: capture stack traces at _init() time
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 1bb5f7fce1fe95fb9a9a9a23845b286ca47c9ed6
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   mm/slub.o: In function `set_track':
>> slub.c:(.text+0x12d2): undefined reference to `save_stack_trace'
   lib/debugobjects.o: In function `save_stack.isra.0':
>> debugobjects.c:(.text+0x9f2): undefined reference to `save_stack_trace'

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