tree: https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git coresched head: ab6dba45b1d05f19d87064315f414761a86ab024 commit: 81ab496aa4fb2f215f7e10edfaaccecc67eef58a [21/27] entry/idle: Enter and exit kernel protection during idle entry and exit config: arm-randconfig-r035-20201214 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/commit/?i... git remote add jfern https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git git fetch --no-tags jfern coresched git checkout 81ab496aa4fb2f215f7e10edfaaccecc67eef58a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): In file included from kernel/sched/idle.c:9: kernel/sched/sched.h:1232:17: warning: 'struct sched_group' declared inside parameter list will not be visible outside of this definition or declaration 1232 | struct sched_group *group) | ^~~~~~~~~~~ In file included from kernel/sched/idle.c:11: 10 | #include <asm/entry-common.h> | ^~~~~~~~~~~~~~~~~~~~ compilation terminated. vim +10 include/linux/entry-common.h 142781e108b13b2 Thomas Gleixner 2020-07-22 9 142781e108b13b2 Thomas Gleixner 2020-07-22 @10 #include <asm/entry-common.h> 142781e108b13b2 Thomas Gleixner 2020-07-22 11 :::::: The code at line 10 was first introduced by commit :::::: 142781e108b13b2b0e8f035cfb5bfbbc8f14d887 entry: Provide generic syscall entry functionality :::::: TO: Thomas Gleixner <tglx(a)linutronix.de&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org