Hi Chenwandun, It's probably a bug fix that unveils the link errors. tree: git://anongit.freedesktop.org/drm/drm-tip drm-tip head: f5cfd96ad87b58bf3b5dfa5365f8beb8bac15a38 commit: 68acde7629d75d460760a3124c52f358eecc6d26 [1865/1875] drm/dp_mst: fix gcc compile error config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 68acde7629d75d460760a3124c52f358eecc6d26 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): kernel/stacktrace.o: In function `stack_trace_save': >> stacktrace.c:(.text+0x120): 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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