tree: https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git do_fork_removal head: e9b5f67188cec59c7cdacf196ab87832365a6d67 commit: 2f397dccefb5d1dad0303c04158f1aa3f89073cd [2/4] sparc: share process creation helpers between sparc and sparc64 config: sparc-allmodconfig (attached as .config) compiler: sparc64-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 git checkout 2f397dccefb5d1dad0303c04158f1aa3f89073cd # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): 16 | asmlinkage long sparc_fork(struct pt_regs *regs) | ^~~~~~~~~~ 39 | asmlinkage long sparc_vfork(struct pt_regs *regs) | ^~~~~~~~~~~ 64 | asmlinkage long sparc_clone(struct pt_regs *regs) | ^~~~~~~~~~~ cc1: all warnings being treated as errors vim +/sparc_fork +16 arch/sparc/kernel/process.c 15 17 { 18 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 19 long ret; 20 struct kernel_clone_args args = { 21 .exit_signal = SIGCHLD, 22 /* Reuse the parent's stack for the child. */ 23 .stack = regs->u_regs[UREG_FP], 24 }; 25 26 ret = _do_fork(&args); 27 28 /* If we get an error and potentially restart the system 29 * call, we're screwed because copy_thread_tls() clobbered 30 * the parent's %o1. So detect that case and restore it 31 * here. 32 */ 33 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) 34 regs->u_regs[UREG_I1] = orig_i1; 35 36 return ret; 37 } 38 40 { 41 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 42 long ret; 43 44 struct kernel_clone_args args = { 45 .flags = CLONE_VFORK | CLONE_VM, 46 .exit_signal = SIGCHLD, 47 /* Reuse the parent's stack for the child. */ 48 .stack = regs->u_regs[UREG_FP], 49 }; 50 51 ret = _do_fork(&args); 52 53 /* If we get an error and potentially restart the system 54 * call, we're screwed because copy_thread_tls() clobbered 55 * the parent's %o1. So detect that case and restore it 56 * here. 57 */ 58 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) 59 regs->u_regs[UREG_I1] = orig_i1; 60 61 return ret; 62 } 63 65 { 66 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 67 unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]); 68 long ret; 69 70 struct kernel_clone_args args = { 71 .flags = (flags & ~CSIGNAL), 72 .exit_signal = (flags & CSIGNAL), 73 .tls = regs->u_regs[UREG_I3], 74 }; 75 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org