[drm-tip:drm-tip 7/8] debug.c:undefined reference to `save_stack_trace'

[kbuild test robot]

Hi Rodrigo,

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

tree:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
head:   20532651221ed29af16e2db0a7ec8b9bd482c994
commit: 315fade0d9f3edbf2592599056c8defbdd95a3ab [7/8] Merge remote-tracking branch 'drm-intel/topic/core-for-CI' into drm-tip
config: m68k-allyesconfig (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 315fade0d9f3edbf2592599056c8defbdd95a3ab
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   kernel/dma/debug.o: In function `dma_entry_alloc':
>> debug.c:(.text+0x11d2): undefined reference to `save_stack_trace'
   kernel/backtracetest.o: In function `backtrace_regression_test':
>> backtracetest.c:(.text+0xd8): undefined reference to `save_stack_trace'
   mm/slub.o: In function `set_track':
>> slub.c:(.text+0x12b4): undefined reference to `save_stack_trace'
   fs/btrfs/ref-verify.o: In function `btrfs_ref_tree_mod':
>> ref-verify.c:(.text+0x92e): 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'

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