Hi Mark, I love your patch! Perhaps something to improve: [auto build test WARNING on dfd42facf1e4ada021b939b4e19c935dcdd55566] url: https://github.com/0day-ci/linux/commits/Mark-Brown/arm64-sme-Initial-sup... base: dfd42facf1e4ada021b939b4e19c935dcdd55566 config: arm64-randconfig-s032-20220207 (https://download.01.org/0day-ci/archive/20220208/202202080624.bZPyvbcL-lk...) compiler: aarch64-linux-gcc (GCC) 11.2.0 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: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/3c145e627affeb9240ccaebb147235e09... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mark-Brown/arm64-sme-Initial-support-for-the-Scalable-Matrix-Extension/20220207-233825 git checkout 3c145e627affeb9240ccaebb147235e09b229b34 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/ block/ drivers/nvme/host/ drivers/nvme/target/ 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/arm64/kernel/signal.c:664:43: sparse: expected struct user_ctxs [noderef] __user *user arch/arm64/kernel/signal.c:664:43: sparse: got struct user_ctxs * arch/arm64/kernel/signal.c:936:26: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void ( [noderef] [usertype] __user *[assigned] [usertype] sigtramp )( ... ) @@ got void * @@ arch/arm64/kernel/signal.c:936:26: sparse: expected void ( [noderef] [usertype] __user *[assigned] [usertype] sigtramp )( ... ) arch/arm64/kernel/signal.c:936:26: sparse: got void * arch/arm64/kernel/signal.c:429:53: sparse: sparse: dereference of noderef expression arch/arm64/kernel/signal.c:429:53: sparse: sparse: dereference of noderef expression vim +664 arch/arm64/kernel/signal.c 47ccb02868cead Dave Martin 2017-06-15 621 2c020ed8d148f7 Catalin Marinas 2012-03-05 622 static int restore_sigframe(struct pt_regs *regs, 2c020ed8d148f7 Catalin Marinas 2012-03-05 623 struct rt_sigframe __user *sf) 2c020ed8d148f7 Catalin Marinas 2012-03-05 624 { 2c020ed8d148f7 Catalin Marinas 2012-03-05 625 sigset_t set; 2c020ed8d148f7 Catalin Marinas 2012-03-05 626 int i, err; 47ccb02868cead Dave Martin 2017-06-15 627 struct user_ctxs user; 2c020ed8d148f7 Catalin Marinas 2012-03-05 628 2c020ed8d148f7 Catalin Marinas 2012-03-05 629 err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); 2c020ed8d148f7 Catalin Marinas 2012-03-05 630 if (err == 0) 2c020ed8d148f7 Catalin Marinas 2012-03-05 631 set_current_blocked(&set); 2c020ed8d148f7 Catalin Marinas 2012-03-05 632 2c020ed8d148f7 Catalin Marinas 2012-03-05 633 for (i = 0; i < 31; i++) 2c020ed8d148f7 Catalin Marinas 2012-03-05 634 __get_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i], 2c020ed8d148f7 Catalin Marinas 2012-03-05 635 err); 2c020ed8d148f7 Catalin Marinas 2012-03-05 636 __get_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err); 2c020ed8d148f7 Catalin Marinas 2012-03-05 637 __get_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err); 2c020ed8d148f7 Catalin Marinas 2012-03-05 638 __get_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err); 2c020ed8d148f7 Catalin Marinas 2012-03-05 639 2c020ed8d148f7 Catalin Marinas 2012-03-05 640 /* 2c020ed8d148f7 Catalin Marinas 2012-03-05 641 * Avoid sys_rt_sigreturn() restarting. 2c020ed8d148f7 Catalin Marinas 2012-03-05 642 */ 17c28958600928 Dave Martin 2017-08-01 643 forget_syscall(regs); 2c020ed8d148f7 Catalin Marinas 2012-03-05 644 dbd4d7ca563fd0 Mark Rutland 2016-03-01 645 err |= !valid_user_regs(&regs->user_regs, current); 47ccb02868cead Dave Martin 2017-06-15 646 if (err == 0) 47ccb02868cead Dave Martin 2017-06-15 647 err = parse_user_sigframe(&user, sf); 2c020ed8d148f7 Catalin Marinas 2012-03-05 648 6d502b6ba1b267 Suzuki K Poulose 2020-01-13 649 if (err == 0 && system_supports_fpsimd()) { 8cd969d28fd284 Dave Martin 2017-10-31 650 if (!user.fpsimd) 8cd969d28fd284 Dave Martin 2017-10-31 651 return -EINVAL; 8cd969d28fd284 Dave Martin 2017-10-31 652 8cd969d28fd284 Dave Martin 2017-10-31 653 if (user.sve) { 8cd969d28fd284 Dave Martin 2017-10-31 654 if (!system_supports_sve()) 8cd969d28fd284 Dave Martin 2017-10-31 655 return -EINVAL; 8cd969d28fd284 Dave Martin 2017-10-31 656 8cd969d28fd284 Dave Martin 2017-10-31 657 err = restore_sve_fpsimd_context(&user); 8cd969d28fd284 Dave Martin 2017-10-31 658 } else { 47ccb02868cead Dave Martin 2017-06-15 659 err = restore_fpsimd_context(user.fpsimd); 8cd969d28fd284 Dave Martin 2017-10-31 660 } 8cd969d28fd284 Dave Martin 2017-10-31 661 } 2c020ed8d148f7 Catalin Marinas 2012-03-05 662 a884c063c23007 Mark Brown 2022-02-07 663 if (err == 0 && system_supports_sme() && user.za) a884c063c23007 Mark Brown 2022-02-07 @664 err = restore_za_context(&user); a884c063c23007 Mark Brown 2022-02-07 665 2c020ed8d148f7 Catalin Marinas 2012-03-05 666 return err; 2c020ed8d148f7 Catalin Marinas 2012-03-05 667 } 2c020ed8d148f7 Catalin Marinas 2012-03-05 668 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org