Re: [drm-intel:topic/drm-misc 1/2] backtracetest.c:undefined reference to `save_stack_trace'

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On Wed, Nov 09, 2016 at 10:01:37PM +0800, kbuild test robot wrote:
> tree:   git://anongit.freedesktop.org/drm-intel topic/drm-misc
> head:   77d150b90d58ae6a43bf67af28feb26384d06cd6
> commit: cd456f8d06d2036e1e013136c3fbf5721d04f6d7 [1/2] drm: Restrict stackdepot usage to builtin drm.ko
> config: m68k-allyesconfig (attached as .config)
> compiler: m68k-linux-gcc (GCC) 4.9.0
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout cd456f8d06d2036e1e013136c3fbf5721d04f6d7
>         # save the attached .config to linux build tree
>         make.cross ARCH=m68k 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel/built-in.o: In function `backtrace_regression_test':
> >> backtracetest.c:(.text+0x550d4): undefined reference to `save_stack_trace'
>    mm/built-in.o: In function `set_track':
>    slub.c:(.text+0x41414): undefined reference to `save_stack_trace'
>    drivers/built-in.o: In function `save_stack.isra.7':
> >> drm_mm.c:(.text+0x16be82): undefined reference to `save_stack_trace'

Anyone got an idea for this one? m68k is missing save_stack_trace().
There's no arch CONFIG_HAS_SAVE_STACK_TRACE, it looks like an oversight
in arch/m68k.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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