[kbuild-all] [mlankhorst:locking-rework 30/31] ERROR: modpost: "stack_depot_fetch" undefined!

tree: git://people.freedesktop.org/~mlankhorst/linux locking-rework head: acf91034f3b9d3272705e05fbc1a3836fbd0d9cf commit: 8402858e024b71e954aafa5ac083ddd711080423 [30/31] drm/i915: Add freed object debugging by freeing synchronously. config: x86_64-randconfig-a006-20200811 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 8402858e024b71e954aafa5ac083ddd711080423 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org