Hi "Christopher, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on powerpc/next] [also build test WARNING on v5.11 next-20210215] [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/Christopher-M-Riedl/Improve-sign... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc64-randconfig-s031-20210215 (attached as .config) compiler: powerpc64le-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/c6e40a98c1ba2f91d123ef23844732b97... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Christopher-M-Riedl/Improve-signal-performance-on-PPC64-with-KUAP/20210204-025741 git checkout c6e40a98c1ba2f91d123ef23844732b97ea96fb3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" arch/powerpc/kernel/signal_64.c:752:36: sparse: expected struct sigset_t const [usertype] *src arch/powerpc/kernel/signal_64.c:752:36: sparse: got struct sigset_t [noderef] __user * arch/powerpc/kernel/signal_64.c:712:36: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sigset_t const [usertype] *src @@ got struct sigset_t [noderef] __user * @@ arch/powerpc/kernel/signal_64.c:712:36: sparse: expected struct sigset_t const [usertype] *src arch/powerpc/kernel/signal_64.c:712:36: sparse: got struct sigset_t [noderef] __user * arch/powerpc/kernel/signal_64.c:103:24: sparse: expected unsigned long const [noderef] __user *__gu_addr arch/powerpc/kernel/signal_64.c:103:24: sparse: got unsigned long const * arch/powerpc/kernel/signal_64.c:105:46: sparse: expected void const [noderef] __user *from arch/powerpc/kernel/signal_64.c:105:46: sparse: got struct sigset_t const [usertype] *src arch/powerpc/kernel/signal_64.c:103:24: sparse: expected unsigned long const [noderef] __user *__gu_addr arch/powerpc/kernel/signal_64.c:103:24: sparse: got unsigned long const * arch/powerpc/kernel/signal_64.c:105:46: sparse: expected void const [noderef] __user *from arch/powerpc/kernel/signal_64.c:105:46: sparse: got struct sigset_t const [usertype] *src vim +752 arch/powerpc/kernel/signal_64.c 733 734 735 /* 736 * Do a signal return; undo the signal stack. 737 */ 738 739 SYSCALL_DEFINE0(rt_sigreturn) 740 { 741 struct pt_regs *regs = current_pt_regs(); 742 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1]; 743 sigset_t set; 744 unsigned long msr; 745 746 /* Always make any pending restarted system calls return -EINTR */ 747 current->restart_block.fn = do_no_restart_syscall; 748 749 if (!access_ok(uc, sizeof(*uc))) 750 goto badframe; 751 753 goto badframe; 754 755 set_current_blocked(&set); 756 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org