tree: https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git do_fork_removal_sparc head: 60adc9458a9bf6bcfe8a40f625f8199887a1125a commit: b45a1967bd8264555d612f6c66eaeb6e0f176e42 [2/3] sparc: share process creation helpers between sparc and sparc64 config: sparc-defconfig (attached as .config) compiler: sparc-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 b45a1967bd8264555d612f6c66eaeb6e0f176e42 # 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 <<): 18 | asmlinkage long sparc_fork(struct pt_regs *regs) | ^~~~~~~~~~ In file included from arch/sparc/kernel/process.c:16: arch/sparc/kernel/kernel.h:158:16: note: previous declaration of 'sparc_fork' was here 158 | asmlinkage int sparc_fork(struct pt_regs *regs); | ^~~~~~~~~~ 41 | asmlinkage long sparc_vfork(struct pt_regs *regs) | ^~~~~~~~~~~ In file included from arch/sparc/kernel/process.c:16: arch/sparc/kernel/kernel.h:159:16: note: previous declaration of 'sparc_vfork' was here 159 | asmlinkage int sparc_vfork(struct pt_regs *regs); | ^~~~~~~~~~~ 66 | asmlinkage long sparc_clone(struct pt_regs *regs) | ^~~~~~~~~~~ In file included from arch/sparc/kernel/process.c:16: arch/sparc/kernel/kernel.h:157:16: note: previous declaration of 'sparc_clone' was here 157 | asmlinkage int sparc_clone(struct pt_regs *regs); | ^~~~~~~~~~~ vim +/sparc_fork +18 arch/sparc/kernel/process.c 17 19 { 20 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 21 long ret; 22 struct kernel_clone_args args = { 23 .exit_signal = SIGCHLD, 24 /* Reuse the parent's stack for the child. */ 25 .stack = regs->u_regs[UREG_FP], 26 }; 27 28 ret = _do_fork(&args); 29 30 /* If we get an error and potentially restart the system 31 * call, we're screwed because copy_thread_tls() clobbered 32 * the parent's %o1. So detect that case and restore it 33 * here. 34 */ 35 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) 36 regs->u_regs[UREG_I1] = orig_i1; 37 38 return ret; 39 } 40 42 { 43 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 44 long ret; 45 46 struct kernel_clone_args args = { 47 .flags = CLONE_VFORK | CLONE_VM, 48 .exit_signal = SIGCHLD, 49 /* Reuse the parent's stack for the child. */ 50 .stack = regs->u_regs[UREG_FP], 51 }; 52 53 ret = _do_fork(&args); 54 55 /* If we get an error and potentially restart the system 56 * call, we're screwed because copy_thread_tls() clobbered 57 * the parent's %o1. So detect that case and restore it 58 * here. 59 */ 60 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) 61 regs->u_regs[UREG_I1] = orig_i1; 62 63 return ret; 64 } 65 67 { 68 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 69 unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]); 70 long ret; 71 72 struct kernel_clone_args args = { 73 .flags = (flags & ~CSIGNAL), 74 .exit_signal = (flags & CSIGNAL), 75 .tls = regs->u_regs[UREG_I3], 76 }; 77 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org