On Wed, May 20, 2020 at 10:05 AM Andrew Morton <akpm(a)linux-foundation.org&gt; wrote: > On Tue, 19 May 2020 16:44:22 +0800 kbuild test robot <lkp(a)intel.com&gt; wrote: > >> Hi Andrew, >> >> First bad commit (maybe != root cause): >> >> tree: https://github.com/hnaz/linux-mm master >> head: 2bbf0589bfeb27800c730b76eacf34528eee5418 >> commit: 91cd0b1b65c463042fdeb4ab5ffcb64ae43179cf [380/523] linux-next-rejects >> config: riscv-allyesconfig (attached as .config) >> compiler: riscv64-linux-gcc (GCC) 9.3.0 >> reproduce: >> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >> chmod +x ~/bin/make.cross >> git checkout 91cd0b1b65c463042fdeb4ab5ffcb64ae43179cf >> # save the attached .config to linux build tree >> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv >> >> If you fix the issue, kindly add following tag as appropriate >> Reported-by: kbuild test robot <lkp(a)intel.com&gt; >> >> All warnings (new ones prefixed by >>, old ones prefixed by <<): >> >>>> arch/riscv/kernel/kgdb.c:47:5: warning: no previous prototype for 'decode_register_index' [-Wmissing-prototypes] >> 47 | int decode_register_index(unsigned long opcode, int offset) >> | ^~~~~~~~~~~~~~~~~~~~~ >>>> arch/riscv/kernel/kgdb.c:52:5: warning: no previous prototype for 'decode_register_index_short' [-Wmissing-prototypes] >> 52 | int decode_register_index_short(unsigned long opcode, int offset) >> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ >>>> arch/riscv/kernel/kgdb.c:58:5: warning: no previous prototype for 'get_step_address' [-Wmissing-prototypes] >> 58 | int get_step_address(struct pt_regs *regs, unsigned long *next_addr) >> | ^~~~~~~~~~~~~~~~ >>>> arch/riscv/kernel/kgdb.c:139:5: warning: no previous prototype for 'do_single_step' [-Wmissing-prototypes] >> 139 | int do_single_step(struct pt_regs *regs) >> | ^~~~~~~~~~~~~~ >>>> arch/riscv/kernel/kgdb.c:276:6: warning: no previous prototype for 'kgdb_arch_handle_qxfer_pkt' [-Wmissing-prototypes] >> 276 | void kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer, >> | ^~~~~~~~~~~~~~~~~~~~~~~~~~ >>>> arch/riscv/kernel/kgdb.c:323:5: warning: no previous prototype for 'kgdb_riscv_kgdbbreak' [-Wmissing-prototypes] >> 323 | int kgdb_riscv_kgdbbreak(unsigned long addr) >> | ^~~~~~~~~~~~~~~~~~~~ >> In file included from arch/riscv/include/asm/kgdb.h:109, >> from include/linux/kgdb.h:20, >> from arch/riscv/kernel/kgdb.c:9: >> arch/riscv/include/asm/gdb_xml.h:7:19: warning: 'riscv_gdb_stub_feature' defined but not used [-Wunused-const-variable=] >> 7 | static const char riscv_gdb_stub_feature[64] = >> | ^~~~~~~~~~~~~~~~~~~~~~ > I doubt if linux-next-rejects caused this error - all that patch does > is fix up a reject between linux-next patches and > https://ozlabs.org/~akpm/mmotm/broken-out/riscv-support-debug_wx.patch > > I'm more suspecting that this error is due Vincent's e4f2aa5808fc9 > ("riscv: Add KGDB support") or 899dc734805df ("riscv: Use the XML > target descriptions to report 3 system registers"). > > I tried to use the following commands to reproduce the above warning messages, but I failed. 1. git clone https://github.com/hnaz/linux-mm 2. wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross 3. chmod +x ~/bin/make.cross 4. cd linux-mm 5. git checkout 91cd0b1b65c463042fdeb4ab5ffcb64ae43179cf 6. make ARCH=riscv allyesconfig 7. COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv Could you help me correct the reproduce steps?