tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.11.10a head: 1bc2f285f9c940176cc2c231db1372d5b2f0c635 commit: 7c1d4bacb30f91a0962490cb9db98371aef1f4d6 [39/46] rcutorture: Add initial test for ->get_gp_state and ->poll_gp_state config: x86_64-randconfig-s022-20201115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-107-gaf3512a6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/com... git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags rcu dev.2020.11.10a git checkout 7c1d4bacb30f91a0962490cb9db98371aef1f4d6 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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 <<): >> ERROR: modpost: "get_state_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined! >> ERROR: modpost: "start_poll_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined! >> ERROR: modpost: "poll_state_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined!