Hi Alistair, Thank you for the patch! Yet something to improve: [auto build test ERROR on linux/master] [also build test ERROR on soc/for-next linus/master v5.15-rc6 next-20211021] [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/Alistair-Francis/uapi-futex-Add-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2f111a6fd5b5297b4e92f53798ca086f7c7d33a4 config: i386-randconfig-a004-20211021 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 3cea2505fd8d99a9ba0cb625aecfe28a47c4e3f8) 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://github.com/0day-ci/linux/commit/6dcb960761dacb92295496cefad0a38e1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alistair-Francis/uapi-futex-Add-a-futex-syscall/20211021-135527 git checkout 6dcb960761dacb92295496cefad0a38e19d4c8ba # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): In file included from <built-in>:1: ./usr/include/linux/futex_syscall.h:21:45: error: unknown type name 'u_int32_t' __kernel_futex_syscall_timeout(__volatile__ u_int32_t *uaddr, int op, u_int32_t val, ^ ./usr/include/linux/futex_syscall.h:21:71: error: unknown type name 'u_int32_t' __kernel_futex_syscall_timeout(__volatile__ u_int32_t *uaddr, int op, u_int32_t val, ^ ./usr/include/linux/futex_syscall.h:22:16: warning: declaration of 'struct timespec' will not be visible outside of this function [-Wvisibility] struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:22:48: error: unknown type name 'u_int32_t' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ if (sizeof(*timeout) != sizeof(struct __kernel_old_timespec)) { ^~~~~~~~~~ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ int ret = syscall(__NR_futex_time64, uaddr, op, val, timeout, uaddr2, val3); ^ ./usr/include/linux/futex_syscall.h:34:12: error: invalid application of 'sizeof' to an incomplete type 'struct timespec' if (sizeof(*timeout) == sizeof(struct __kernel_old_timespec)) ^~~~~~~~~~ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:35:10: error: implicit declaration of function 'syscall' [-Werror,-Wimplicit-function-declaration] return syscall(__NR_futex, uaddr, op, val, timeout, uaddr2, val3); ^ if (timeout && timeout->tv_sec == (long)timeout->tv_sec) { ~~~~~~~^ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:37:49: error: incomplete definition of type 'struct timespec' if (timeout && timeout->tv_sec == (long)timeout->tv_sec) { ~~~~~~~^ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:40:42: error: incomplete definition of type 'struct timespec' ts32.tv_sec = (__kernel_long_t) timeout->tv_sec; ~~~~~~~^ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:41:43: error: incomplete definition of type 'struct timespec' ts32.tv_nsec = (__kernel_long_t) timeout->tv_nsec; ~~~~~~~^ ./usr/include/linux/futex_syscall.h:22:16: note: forward declaration of 'struct timespec' struct timespec *timeout, __volatile__ u_int32_t *uaddr2, int val3) ^ return syscall(__NR_futex, uaddr, op, val, NULL, uaddr2, val3); ^ ./usr/include/linux/futex_syscall.h:63:48: error: unknown type name 'u_int32_t' __kernel_futex_syscall_nr_requeue(__volatile__ u_int32_t *uaddr, int op, u_int32_t val, ^ ./usr/include/linux/futex_syscall.h:63:74: error: unknown type name 'u_int32_t' __kernel_futex_syscall_nr_requeue(__volatile__ u_int32_t *uaddr, int op, u_int32_t val, ^ ./usr/include/linux/futex_syscall.h:64:5: error: unknown type name 'u_int32_t' u_int32_t nr_requeue, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:64:40: error: unknown type name 'u_int32_t' u_int32_t nr_requeue, __volatile__ u_int32_t *uaddr2, int val3) ^ ./usr/include/linux/futex_syscall.h:67:13: error: implicit declaration of function 'syscall' [-Werror,-Wimplicit-function-declaration] int ret = syscall(__NR_futex_time64, uaddr, op, val, nr_requeue, uaddr2, val3); ^ 1 warning and 17 errors generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org