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

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On Sat, Jul 21, 2018 at 11:30:27AM +0800, kbuild test robot wrote:
> 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'

probably this?

commit 3ef9e3d575a2b725e5783fd57192ceb573359a33
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date:   Tue Mar 20 17:02:58 2018 +0100

    RFC: debugobjects: capture stack traces at _init() time

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


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