[kbuild-all] [tglx-devel:x86/fpu 81/82] core.c:undefined reference to `__fpu_state_size_dynamic'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/fpu head: fbeb78415a1b32f890fa49e4355faa02bb0c0602 commit: 57e37526099d33c397f7a6bb1a0198ba1e148478 [81/82] x86/fpu: Add XFD handling for dynamic states config: i386-tinyconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel x86/fpu git checkout 57e37526099d33c397f7a6bb1a0198ba1e148478 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): ld: arch/x86/kernel/fpu/core.o: in function `fpu_clone': ld: arch/x86/kernel/fpu/xstate.o: in function `fpu__resume_cpu': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org