tree: https://github.com/c-sky/csky-linux riscv_compat_v2_sv48_v3_mmind_pbmt head: b28a50c03a72c48d3895320bdd0757e0a8acb881 commit: 330ce3d4a3edd32464ac6deb817c211526c40781 [42/44] riscv: add RISC-V Svpbmt extension supports config: riscv-randconfig-r042-20220117 (https://download.01.org/0day-ci/archive/20220119/202201190246.f3cvUQdo-lk...) compiler: riscv32-linux-gcc (GCC) 11.2.0 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 # https://github.com/c-sky/csky-linux/commit/330ce3d4a3edd32464ac6deb817c21... git remote add csky-linux https://github.com/c-sky/csky-linux git fetch --no-tags csky-linux riscv_compat_v2_sv48_v3_mmind_pbmt git checkout 330ce3d4a3edd32464ac6deb817c211526c40781 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/ 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/riscv/kernel/setup.c: In function 'free_initmem': arch/riscv/kernel/setup.c:326:9: error: implicit declaration of function 'ALT_THEAD_PMA' [-Werror=implicit-function-declaration] 326 | ALT_THEAD_PMA(prot_val); | ^~~~~~~~~~~~~ In file included from include/asm-generic/bug.h:22, from arch/riscv/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from arch/riscv/kernel/setup.c:12: 328 | printk("%s: _PAGE_IO: 0x%lx\n", __func__, _PAGE_IO); | ^~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:422:25: note: in definition of macro 'printk_index_wrap' 422 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~ arch/riscv/kernel/setup.c:328:1: note: in expansion of macro 'printk' 328 | printk("%s: _PAGE_IO: 0x%lx\n", __func__, _PAGE_IO); | ^~~~~~ arch/riscv/kernel/setup.c:328:27: note: format string is defined here 328 | printk("%s: _PAGE_IO: 0x%lx\n", __func__, _PAGE_IO); | ~~^ | | | long unsigned int | %x In file included from include/asm-generic/bug.h:22, from arch/riscv/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from arch/riscv/kernel/setup.c:12: arch/riscv/kernel/setup.c:329:8: warning: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'int' [-Wformat=] 329 | printk("%s: _PAGE_NOCACHE: 0x%lx\n", __func__, _PAGE_NOCACHE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:422:25: note: in definition of macro 'printk_index_wrap' 422 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~ arch/riscv/kernel/setup.c:329:1: note: in expansion of macro 'printk' 329 | printk("%s: _PAGE_NOCACHE: 0x%lx\n", __func__, _PAGE_NOCACHE); | ^~~~~~ arch/riscv/kernel/setup.c:329:32: note: format string is defined here 329 | printk("%s: _PAGE_NOCACHE: 0x%lx\n", __func__, _PAGE_NOCACHE); | ~~^ | | | long unsigned int | %x cc1: some warnings being treated as errors vim +328 arch/riscv/kernel/setup.c 19a00869028f4a Atish Patra 2020-11-04 320 19a00869028f4a Atish Patra 2020-11-04 321 void free_initmem(void) 19a00869028f4a Atish Patra 2020-11-04 322 { a8a0c8f014166b Heiko Stuebner 2021-12-17 323 unsigned long prot_val = pgprot_val(PAGE_KERNEL); a8a0c8f014166b Heiko Stuebner 2021-12-17 324 a8a0c8f014166b Heiko Stuebner 2021-12-17 325 printk("%s: _PAGE_KERNEL-orig: 0x%lx\n", __func__, prot_val); a8a0c8f014166b Heiko Stuebner 2021-12-17 326 ALT_THEAD_PMA(prot_val); a8a0c8f014166b Heiko Stuebner 2021-12-17 327 printk("%s: _PAGE_KERNEL: 0x%lx\n", __func__, prot_val); a8a0c8f014166b Heiko Stuebner 2021-12-17 @328 printk("%s: _PAGE_IO: 0x%lx\n", __func__, _PAGE_IO); :::::: The code at line 328 was first introduced by commit :::::: a8a0c8f014166b1e95e223240632fd0baac50ea7 hack in a debug output in freeinitmem :::::: TO: Heiko Stuebner <heiko(a)sntech.de&gt; :::::: CC: Guo Ren <guoren(a)linux.alibaba.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org