[drm-intel:topic/core-for-CI 7/8] undefined reference to `save_stack_trace'

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel topic/core-for-CI
head:   e2ea2db1734a0e38b89e4d706b5f9ad9f73b1543
commit: 72041f9847abb05b9d4d7dea17631b579191ca99 [7/8] RFC: debugobjects: capture stack traces at _init() time
config: alpha-allyesconfig (attached as .config)
compiler: alpha-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 72041f9847abb05b9d4d7dea17631b579191ca99
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   kernel/backtracetest.o: In function `backtrace_regression_test':
>> (.text+0x1b8): undefined reference to `save_stack_trace'
   (.text+0x1cc): undefined reference to `save_stack_trace'
   mm/slub.o: In function `set_track':
   (.text+0xf58): undefined reference to `save_stack_trace'
   (.text+0xf74): undefined reference to `save_stack_trace'
   fs/btrfs/ref-verify.o: In function `btrfs_ref_tree_mod':
   (.text+0xd1c): undefined reference to `save_stack_trace'
   fs/btrfs/ref-verify.o:(.text+0xd64): more undefined references to `save_stack_trace' follow

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