Hi Mark, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on arm64/for-next/core] [also build test ERROR on powerpc/next linus/master tip/core/entry v5.13-rc6 next-20210616] [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/Mark-Rutland/thread_info-use-hel... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-randconfig-p001-20210615 (attached as .config) compiler: aarch64-linux-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://github.com/0day-ci/linux/commit/a1022e40673660308b0f52aa06bc5798d... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mark-Rutland/thread_info-use-helpers-to-snapshot-thread-flags/20210616-183127 git checkout a1022e40673660308b0f52aa06bc5798d7575eba # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): arch/arm64/kernel/signal.c:927:17: warning: no previous prototype for 'do_notify_resume' [-Wmissing-prototypes] 927 | asmlinkage void do_notify_resume(struct pt_regs *regs, | ^~~~~~~~~~~~~~~~ arch/arm64/kernel/signal.c: In function 'do_notify_resume': 974 | thread_flags = read_thead_flags(); | ^~~~~~~~~~~~~~~~ | read_thread_flags cc1: some warnings being treated as errors vim +974 arch/arm64/kernel/signal.c 926 927 asmlinkage void do_notify_resume(struct pt_regs *regs, 928 unsigned long thread_flags) 929 { 930 do { 931 if (thread_flags & _TIF_NEED_RESCHED) { 932 /* Unmask Debug and SError for the next task */ 933 local_daif_restore(DAIF_PROCCTX_NOIRQ); 934 935 schedule(); 936 } else { 937 local_daif_restore(DAIF_PROCCTX); 938 939 if (thread_flags & _TIF_UPROBE) 940 uprobe_notify_resume(regs); 941 942 if (thread_flags & _TIF_MTE_ASYNC_FAULT) { 943 clear_thread_flag(TIF_MTE_ASYNC_FAULT); 944 send_sig_fault(SIGSEGV, SEGV_MTEAERR, 945 (void __user *)NULL, current); 946 } 947 948 if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) 949 do_signal(regs); 950 951 if (thread_flags & _TIF_NOTIFY_RESUME) { 952 tracehook_notify_resume(regs); 953 rseq_handle_notify_resume(NULL, regs); 954 955 /* 956 * If we reschedule after checking the affinity 957 * then we must ensure that TIF_NOTIFY_RESUME 958 * is set so that we check the affinity again. 959 * Since tracehook_notify_resume() clears the 960 * flag, ensure that the compiler doesn't move 961 * it after the affinity check. 962 */ 963 barrier(); 964 965 if (cpu_affinity_invalid(regs)) 966 force_sig(SIGKILL); 967 } 968 969 if (thread_flags & _TIF_FOREIGN_FPSTATE) 970 fpsimd_restore_current_state(); 971 } 972 973 local_daif_mask(); 975 } while (thread_flags & _TIF_WORK_MASK); 976 } 977 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org