Hi Peter, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on tip/sched/core] [also build test ERROR on tip/master linus/master v5.17-rc3] [cannot apply to tip/x86/core arnd-asm-generic/master tip/x86/asm tip/core/entry next-20220211] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Peter-Oskolkov/RFC-sched-UMCG-ep... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git c8eaf6ac76f40f6c59fc7d056e2e08c4a57ea9c7 config: x86_64-randconfig-a015 (https://download.01.org/0day-ci/archive/20220212/202202121149.e0CZvI0s-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/64a46b86ef2bb15a0a1bc7566b6ca87f5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Peter-Oskolkov/RFC-sched-UMCG-episode-IV-A-New-Hope/20220212-031635 git checkout 64a46b86ef2bb15a0a1bc7566b6ca87f5e0492dd # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 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 >>): In file included from <command-line>:32: 110 | u64 worker_id; | ^~~ 111 | u32 worker_event_type; | ^~~ ./usr/include/linux/umcg.h:112:2: error: unknown type name 'u32' 112 | u32 counter; | ^~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org