[kbuild-all] [arnd-playground:generic-uaccess 4/5] lib/strncpy_from_user.c:123:13: error: implicit declaration of function 'user_addr_max'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git generic-uaccess head: 7731bf9d8dc1468d45db173cbe49cbe19c39a4a7 commit: 04e17803c96bb95527da87c2cfbac2f7cb6d697f [4/5] asm-generic: uaccess: use generic uaccess on m68k, h8300 and riscv config: h8300-allyesconfig (attached as .config) compiler: h8300-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://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground generic-uaccess git checkout 04e17803c96bb95527da87c2cfbac2f7cb6d697f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): lib/strncpy_from_user.c: In function 'strncpy_from_user': 123 | max_addr = user_addr_max(); | ^~~~~~~~~~~~~ cc1: some warnings being treated as errors -- lib/strnlen_user.c: In function 'strnlen_user': 99 | max_addr = user_addr_max(); | ^~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/user_addr_max +123 lib/strncpy_from_user.c 2922585b93294d David S. Miller 2012-05-24 94 2922585b93294d David S. Miller 2012-05-24 95 /** 2922585b93294d David S. Miller 2012-05-24 96 * strncpy_from_user: - Copy a NUL terminated string from userspace. 2922585b93294d David S. Miller 2012-05-24 97 * @dst: Destination address, in kernel space. This buffer must be at 2922585b93294d David S. Miller 2012-05-24 98 * least @count bytes long. 2922585b93294d David S. Miller 2012-05-24 99 * @src: Source address, in user space. 2922585b93294d David S. Miller 2012-05-24 100 * @count: Maximum number of bytes to copy, including the trailing NUL. 2922585b93294d David S. Miller 2012-05-24 101 * 2922585b93294d David S. Miller 2012-05-24 102 * Copies a NUL-terminated string from userspace to kernel space. 2922585b93294d David S. Miller 2012-05-24 103 * 2922585b93294d David S. Miller 2012-05-24 104 * On success, returns the length of the string (not including the trailing 2922585b93294d David S. Miller 2012-05-24 105 * NUL). 2922585b93294d David S. Miller 2012-05-24 106 * 2922585b93294d David S. Miller 2012-05-24 107 * If access to userspace fails, returns -EFAULT (some data may have been 2922585b93294d David S. Miller 2012-05-24 108 * copied). 2922585b93294d David S. Miller 2012-05-24 109 * 2922585b93294d David S. Miller 2012-05-24 110 * If @count is smaller than the length of the string, copies @count bytes 2922585b93294d David S. Miller 2012-05-24 111 * and returns @count. 2922585b93294d David S. Miller 2012-05-24 112 */ 2922585b93294d David S. Miller 2012-05-24 113 long strncpy_from_user(char *dst, const char __user *src, long count) 2922585b93294d David S. Miller 2012-05-24 114 { 2922585b93294d David S. Miller 2012-05-24 115 unsigned long max_addr, src_addr; 2922585b93294d David S. Miller 2012-05-24 116 07887358993d48 KP Singh 2020-06-04 117 might_fault(); 4d0e9df5e43dba Albert van der Linde 2020-10-15 118 if (should_fail_usercopy()) 4d0e9df5e43dba Albert van der Linde 2020-10-15 119 return -EFAULT; 2922585b93294d David S. Miller 2012-05-24 120 if (unlikely(count <= 0)) 2922585b93294d David S. Miller 2012-05-24 121 return 0; 2922585b93294d David S. Miller 2012-05-24 122 2922585b93294d David S. Miller 2012-05-24 @123 max_addr = user_addr_max(); :::::: The code at line 123 was first introduced by commit :::::: 2922585b93294d47172a765115e0dbc1bfe1be19 lib: Sparc's strncpy_from_user is generic enough, move under lib/ :::::: TO: David S. Miller <davem(a)davemloft.net&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org