tree: https://github.com/hnaz/linux-mm master head: 12891f829e4851b3562ddcde27a4a9ade308ada3 commit: 161b082aa6ac5047f1b0f243f0e834d2bfb39842 [179/239] kernel.h: split out panic and oops helpers config: nds32-defconfig (attached as .config) compiler: nds32le-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 # https://github.com/hnaz/linux-mm/commit/161b082aa6ac5047f1b0f243f0e834d2b... git remote add hnaz-linux-mm https://github.com/hnaz/linux-mm git fetch --no-tags hnaz-linux-mm master git checkout 161b082aa6ac5047f1b0f243f0e834d2bfb39842 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the hnaz-linux-mm/master HEAD 12891f829e4851b3562ddcde27a4a9ade308ada3 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from ./arch/nds32/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from lib/strncpy_from_user.c:6: include/linux/thread_info.h: In function 'check_copy_size': 215 | if (WARN_ON_ONCE(bytes > INT_MAX)) | ^~~~~~~ include/asm-generic/bug.h:146:27: note: in definition of macro 'WARN_ON_ONCE' 146 | int __ret_warn_once = !!(condition); \ | ^~~~~~~~~ In file included from lib/strncpy_from_user.c:6: include/linux/thread_info.h:60:1: note: 'INT_MAX' is defined in header '<limits.h>'; did you forget to '#include <limits.h>'? 59 | #include <asm/thread_info.h> +++ |+#include <limits.h> 60 | In file included from ./arch/nds32/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/thread_info.h:12, from lib/strncpy_from_user.c:6: include/linux/thread_info.h:215:27: note: each undeclared identifier is reported only once for each function it appears in 215 | if (WARN_ON_ONCE(bytes > INT_MAX)) | ^~~~~~~ include/asm-generic/bug.h:146:27: note: in definition of macro 'WARN_ON_ONCE' 146 | int __ret_warn_once = !!(condition); \ | ^~~~~~~~~ vim +/INT_MAX +215 include/linux/thread_info.h b0377fedb65280 Al Viro 2017-06-29 201 9dd819a15162f8 Kees Cook 2019-09-25 202 static __always_inline __must_check bool b0377fedb65280 Al Viro 2017-06-29 203 check_copy_size(const void *addr, size_t bytes, bool is_source) b0377fedb65280 Al Viro 2017-06-29 204 { b0377fedb65280 Al Viro 2017-06-29 205 int sz = __compiletime_object_size(addr); b0377fedb65280 Al Viro 2017-06-29 206 if (unlikely(sz >= 0 && sz < bytes)) { b0377fedb65280 Al Viro 2017-06-29 207 if (!__builtin_constant_p(bytes)) b0377fedb65280 Al Viro 2017-06-29 208 copy_overflow(sz, bytes); b0377fedb65280 Al Viro 2017-06-29 209 else if (is_source) b0377fedb65280 Al Viro 2017-06-29 210 __bad_copy_from(); b0377fedb65280 Al Viro 2017-06-29 211 else b0377fedb65280 Al Viro 2017-06-29 212 __bad_copy_to(); b0377fedb65280 Al Viro 2017-06-29 213 return false; b0377fedb65280 Al Viro 2017-06-29 214 } 6d13de1489b6bf Kees Cook 2019-12-04 @215 if (WARN_ON_ONCE(bytes > INT_MAX)) 6d13de1489b6bf Kees Cook 2019-12-04 216 return false; b0377fedb65280 Al Viro 2017-06-29 217 check_object_size(addr, bytes, is_source); b0377fedb65280 Al Viro 2017-06-29 218 return true; b0377fedb65280 Al Viro 2017-06-29 219 } b0377fedb65280 Al Viro 2017-06-29 220 :::::: The code at line 215 was first introduced by commit :::::: 6d13de1489b6bf539695f96d945de3860e6d5e17 uaccess: disallow > INT_MAX copy sizes :::::: TO: Kees Cook <keescook(a)chromium.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org