Hi Vineet, FYI, the error/warning still remains.

tree: https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/g... master head: 50a1180e6cf12462bbbf3f2ebc5b93094ed9abee commit: 98ec2edf58c820ef953fbdfcf98d706aa804b822 [8465/8758] ARCv2: save ABI registers across signal handling config: arc-randconfig-r001-20210610 (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://urldefense.com/v3/__https://raw.githubusercontent.com/intel/lkp-t... -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/g... git remote add linux-next https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/g... git fetch --no-tags linux-next master git checkout 98ec2edf58c820ef953fbdfcf98d706aa804b822 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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/arc/kernel/signal.c: In function 'stash_usr_regs': >> arch/arc/kernel/signal.c:101:21: error: 'struct pt_regs' has no member named 'r30'; did you mean 'r10'? 101 | v2abi.r30 = regs->r30; | ^~~ | r10 arch/arc/kernel/signal.c: In function 'restore_usr_regs': arch/arc/kernel/signal.c:134:9: error: 'struct pt_regs' has no member named 'r30'; did you mean 'r10'? 134 | regs->r30 = v2abi.r30; | ^~~ | r10 arch/arc/kernel/signal.c: At top level: arch/arc/kernel/signal.c:387:6: warning: no previous prototype for 'do_signal' [-Wmissing-prototypes] 387 | void do_signal(struct pt_regs *regs) | ^~~~~~~~~ arch/arc/kernel/signal.c:420:6: warning: no previous prototype for 'do_notify_resume' [-Wmissing-prototypes] 420 | void do_notify_resume(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~ vim +101 arch/arc/kernel/signal.c 63 64 static int 65 stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs, 66 sigset_t *set) 67 { 68 int err; 69 struct user_regs_struct uregs; 70 71 uregs.scratch.bta = regs->bta; 72 uregs.scratch.lp_start = regs->lp_start; 73 uregs.scratch.lp_end = regs->lp_end; 74 uregs.scratch.lp_count = regs->lp_count; 75 uregs.scratch.status32 = regs->status32; 76 uregs.scratch.ret = regs->ret; 77 uregs.scratch.blink = regs->blink; 78 uregs.scratch.fp = regs->fp; 79 uregs.scratch.gp = regs->r26; 80 uregs.scratch.r12 = regs->r12; 81 uregs.scratch.r11 = regs->r11; 82 uregs.scratch.r10 = regs->r10; 83 uregs.scratch.r9 = regs->r9; 84 uregs.scratch.r8 = regs->r8; 85 uregs.scratch.r7 = regs->r7; 86 uregs.scratch.r6 = regs->r6; 87 uregs.scratch.r5 = regs->r5; 88 uregs.scratch.r4 = regs->r4; 89 uregs.scratch.r3 = regs->r3; 90 uregs.scratch.r2 = regs->r2; 91 uregs.scratch.r1 = regs->r1; 92 uregs.scratch.r0 = regs->r0; 93 uregs.scratch.sp = regs->sp; 94 95 err = __copy_to_user(&(sf->uc.uc_mcontext.regs.scratch), &uregs.scratch, 96 sizeof(sf->uc.uc_mcontext.regs.scratch)); 97 98 if (is_isa_arcv2()) { 99 struct user_regs_arcv2 v2abi; 100 > 101 v2abi.r30 = regs->r30; 102 #ifdef CONFIG_ARC_HAS_ACCL_REGS 103 v2abi.r58 = regs->r58; 104 v2abi.r59 = regs->r59; 105 #else 106 v2abi.r58 = v2abi.r59 = 0; 107 #endif 108 err |= __copy_to_user(&(sf->uc.uc_mcontext.v2abi), &v2abi, 109 sizeof(sf->uc.uc_mcontext.v2abi)); 110 } 111 112 err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t)); 113 114 return err ? -EFAULT : 0; 115 } 116 --- 0-DAY CI Kernel Test Service, Intel Corporation https://urldefense.com/v3/__https://lists.01.org/hyperkitty/list/kbuild-a...