Hi Masahiro, I love your patch! Perhaps something to improve: [auto build test WARNING on masahiroy-kbuild/for-next] [also build test WARNING on linus/master v6.0-rc4] [cannot apply to next-20220901] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209 base: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next config: riscv-randconfig-r042-20220905 (https://download.01.org/0day-ci/archive/20220905/202209052329.sY4Fx2fi-lkp@xxxxxxxxx/config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c55b41d5199d2394dd6cdb8f52180d8b81d809d4) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/2f8ee1865d7d00ad27460d94056c7752cad8481f git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209 git checkout 2f8ee1865d7d00ad27460d94056c7752cad8481f # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/riscv/kernel/head.S:329:5: warning: 'CONFIG_RISCV_BOOT_SPINWAIT' is not defined, evaluates to 0 [-Wundef] #if CONFIG_RISCV_BOOT_SPINWAIT ^ 1 warning generated. vim +/CONFIG_RISCV_BOOT_SPINWAIT +329 arch/riscv/kernel/head.S 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 316 76d4467a97bd8c Qiu Wenbo 2020-08-13 317 call setup_trap_vector 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 318 /* Restore C environment */ 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 319 la tp, init_task c637b911e06697 Christoph Hellwig 2019-04-15 320 la sp, init_thread_union + THREAD_SIZE 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 321 8ad8b72721d0f0 Nick Hu 2020-01-06 322 #ifdef CONFIG_KASAN 8ad8b72721d0f0 Nick Hu 2020-01-06 323 call kasan_early_init 8ad8b72721d0f0 Nick Hu 2020-01-06 324 #endif 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 325 /* Start the kernel */ 335b139057ef79 Damien Le Moal 2020-03-16 326 call soc_early_init 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 327 tail start_kernel 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 328 2ffc48fc7071da Atish Patra 2022-01-20 @329 #if CONFIG_RISCV_BOOT_SPINWAIT 0b39eb38f85908 Atish Patra 2022-01-20 330 .Lsecondary_start: 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 331 /* Set trap vector to spin forever to help debug */ 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 332 la a3, .Lsecondary_park a4c3733d32a72f Christoph Hellwig 2019-10-28 333 csrw CSR_TVEC, a3 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 334 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 335 slli a3, a0, LGREG c78f94f35cf648 Atish Patra 2022-01-20 336 la a1, __cpu_spinwait_stack_pointer 44c922572952d8 Vitaly Wool 2021-04-13 337 XIP_FIXUP_OFFSET a1 c78f94f35cf648 Atish Patra 2022-01-20 338 la a2, __cpu_spinwait_task_pointer 44c922572952d8 Vitaly Wool 2021-04-13 339 XIP_FIXUP_OFFSET a2 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 340 add a1, a3, a1 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 341 add a2, a3, a2 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 342 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 343 /* 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 344 * This hart didn't win the lottery, so we wait for the winning hart to 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 345 * get far enough along the boot process that it should continue. 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 346 */ 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 347 .Lwait_for_cpu_up: 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 348 /* FIXME: We should WFI to save some energy here. */ 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 349 REG_L sp, (a1) 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 350 REG_L tp, (a2) 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 351 beqz sp, .Lwait_for_cpu_up 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 352 beqz tp, .Lwait_for_cpu_up 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 353 fence 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 354 153c46faf6ae49 Jisheng Zhang 2021-11-29 355 tail .Lsecondary_start_common 2ffc48fc7071da Atish Patra 2022-01-20 356 #endif /* CONFIG_RISCV_BOOT_SPINWAIT */ 76d2a0493a17d4 Palmer Dabbelt 2017-07-10 357 -- 0-DAY CI Kernel Test Service https://01.org/lkp
