tree: https://github.com/c-sky/csky-linux linux-next head: 66c40fbeccdab07f3ef89bf738f6d0c0536f4975 commit: 5bc46ce26cfc42fa066b2206621587f9dea9a8a8 [7/13] csky: Optimize the trap processing flow config: csky-defconfig (attached as .config) compiler: csky-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 5bc46ce26cfc42fa066b2206621587f9dea9a8a8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=csky If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): arch/csky/kernel/traps.c:59:13: warning: no previous prototype for 'trap_init' [-Wmissing-prototypes] 59 | void __init trap_init(void) | ^~~~~~~~~ 117 | void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr) | ^~~~~~~ 152 | DO_ERROR_INFO(do_trap_unknown, | ^~~~~~~~~~~~~~~ arch/csky/kernel/traps.c:147:27: note: in definition of macro 'DO_ERROR_INFO' 147 | asmlinkage __visible void name(struct pt_regs *regs) \ | ^~~~ 154 | DO_ERROR_INFO(do_trap_zdiv, | ^~~~~~~~~~~~ arch/csky/kernel/traps.c:147:27: note: in definition of macro 'DO_ERROR_INFO' 147 | asmlinkage __visible void name(struct pt_regs *regs) \ | ^~~~ 156 | DO_ERROR_INFO(do_trap_buserr, | ^~~~~~~~~~~~~~ arch/csky/kernel/traps.c:147:27: note: in definition of macro 'DO_ERROR_INFO' 147 | asmlinkage __visible void name(struct pt_regs *regs) \ | ^~~~ 159 | asmlinkage void do_trap_misaligned(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~ 170 | asmlinkage void do_trap_bkpt(struct pt_regs *regs) | ^~~~~~~~~~~~ 189 | asmlinkage void do_trap_illinsn(struct pt_regs *regs) | ^~~~~~~~~~~~~~~ 212 | asmlinkage void do_trap_fpe(struct pt_regs *regs) | ^~~~~~~~~~~ 222 | asmlinkage void do_trap_priv(struct pt_regs *regs) | ^~~~~~~~~~~~ arch/csky/kernel/traps.c:232:17: warning: no previous prototype for 'trap_c' [-Wmissing-prototypes] 232 | asmlinkage void trap_c(struct pt_regs *regs) | ^~~~~~ vim +/do_trap +117 arch/csky/kernel/traps.c 116 118 { 119 struct task_struct *tsk = current; 120 121 if (show_unhandled_signals && unhandled_signal(tsk, signo) 122 && printk_ratelimit()) { 123 pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x%08lx", 124 tsk->comm, task_pid_nr(tsk), signo, code, addr); 125 print_vma_addr(KERN_CONT " in ", instruction_pointer(regs)); 126 pr_cont("\n"); 127 show_regs(regs); 128 } 129 130 force_sig_fault(signo, code, (void __user *)addr); 131 } 132 133 static void do_trap_error(struct pt_regs *regs, int signo, int code, 134 unsigned long addr, const char *str) 135 { 136 current->thread.trap_no = trap_no(regs); 137 138 if (user_mode(regs)) { 139 do_trap(regs, signo, code, addr); 140 } else { 141 if (!fixup_exception(regs)) 142 die(regs, str); 143 } 144 } 145 146 #define DO_ERROR_INFO(name, signo, code, str) \ 147 asmlinkage __visible void name(struct pt_regs *regs) \ 148 { \ 149 do_trap_error(regs, signo, code, regs->pc, "Oops - " str); \ 150 } 151 153 SIGILL, ILL_ILLTRP, "unknown exception"); 155 SIGFPE, FPE_INTDIV, "error zero div exception"); 157 SIGSEGV, ILL_ILLADR, "error bus error exception"); 158 160 { 161 #ifdef CONFIG_CPU_NEED_SOFTALIGN 162 csky_alignment(regs); 163 #else 164 current->thread.trap_no = trap_no(regs); 165 do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->pc, 166 "Oops - load/store address misaligned"); 167 #endif 168 } 169 171 { 172 #ifdef CONFIG_KPROBES 173 if (kprobe_single_step_handler(regs)) 174 return; 175 #endif 176 #ifdef CONFIG_UPROBES 177 if (uprobe_single_step_handler(regs)) 178 return; 179 #endif 180 if (user_mode(regs)) { 181 send_sig(SIGTRAP, current, 0); 182 return; 183 } 184 185 do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->pc, 186 "Oops - illegal trap exception"); 187 } 188 190 { 191 current->thread.trap_no = trap_no(regs); 192 193 #ifdef CONFIG_KPROBES 194 if (kprobe_breakpoint_handler(regs)) 195 return; 196 #endif 197 #ifdef CONFIG_UPROBES 198 if (uprobe_breakpoint_handler(regs)) 199 return; 200 #endif 201 #ifndef CONFIG_CPU_NO_USER_BKPT 202 if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) { 203 send_sig(SIGTRAP, current, 0); 204 return; 205 } 206 #endif 207 208 do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc, 209 "Oops - illegal instruction exception"); 210 } 211 213 { 214 #ifdef CONFIG_CPU_HAS_FP 215 return fpu_fpe(regs); 216 #else 217 do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc, 218 "Oops - fpu instruction exception"); 219 #endif 220 } 221 223 { 224 #ifdef CONFIG_CPU_HAS_FP 225 if (user_mode(regs) && fpu_libc_helper(regs)) 226 return; 227 #endif 228 do_trap_error(regs, SIGILL, ILL_PRVOPC, regs->pc, 229 "Oops - illegal privileged exception"); 230 } 231 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org