tree: https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git mips-next head: 5cad8323040bb8d47e130c10ea4dcb7175c7602a commit: 99b619b37ae151dc0fcdffcae48b5a5ad90ebde8 [4/29] mips: provide unxlate_dev_mem_ptr() in asm/io.h config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230610/202306100214.RjlWlYDU-lkp@xxxxxxxxx/config) compiler: sh4-linux-gcc (GCC) 12.3.0 reproduce (this is a W=1 build): mkdir -p ~/bin 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/mips/linux.git/commit/?id=99b619b37ae151dc0fcdffcae48b5a5ad90ebde8 git remote add mips-linux https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git git fetch --no-tags mips-linux mips-next git checkout 99b619b37ae151dc0fcdffcae48b5a5ad90ebde8 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=sh olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash drivers/char/ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202306100214.RjlWlYDU-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): drivers/char/mem.c: In function 'read_mem': >> drivers/char/mem.c:164:25: error: implicit declaration of function 'unxlate_dev_mem_ptr'; did you mean 'xlate_dev_mem_ptr'? [-Werror=implicit-function-declaration] 164 | unxlate_dev_mem_ptr(p, ptr); | ^~~~~~~~~~~~~~~~~~~ | xlate_dev_mem_ptr cc1: some warnings being treated as errors vim +164 drivers/char/mem.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 133 22ec1a2aea73b9 Kees Cook 2017-12-01 134 bounce = kmalloc(PAGE_SIZE, GFP_KERNEL); 22ec1a2aea73b9 Kees Cook 2017-12-01 135 if (!bounce) 22ec1a2aea73b9 Kees Cook 2017-12-01 136 return -ENOMEM; 22ec1a2aea73b9 Kees Cook 2017-12-01 137 ^1da177e4c3f41 Linus Torvalds 2005-04-16 138 while (count > 0) { fa29e97bb8c70f Wu Fengguang 2009-12-14 139 unsigned long remaining; b5b38200ebe548 Kees Cook 2018-03-27 140 int allowed, probe; fa29e97bb8c70f Wu Fengguang 2009-12-14 141 f222318e9c3a31 Wu Fengguang 2009-12-14 142 sz = size_inside_page(p, count); ^1da177e4c3f41 Linus Torvalds 2005-04-16 143 22ec1a2aea73b9 Kees Cook 2017-12-01 144 err = -EPERM; a4866aa812518e Kees Cook 2017-04-05 145 allowed = page_is_allowed(p >> PAGE_SHIFT); a4866aa812518e Kees Cook 2017-04-05 146 if (!allowed) 22ec1a2aea73b9 Kees Cook 2017-12-01 147 goto failed; 22ec1a2aea73b9 Kees Cook 2017-12-01 148 22ec1a2aea73b9 Kees Cook 2017-12-01 149 err = -EFAULT; a4866aa812518e Kees Cook 2017-04-05 150 if (allowed == 2) { a4866aa812518e Kees Cook 2017-04-05 151 /* Show zeros for restricted memory. */ a4866aa812518e Kees Cook 2017-04-05 152 remaining = clear_user(buf, sz); a4866aa812518e Kees Cook 2017-04-05 153 } else { ^1da177e4c3f41 Linus Torvalds 2005-04-16 154 /* a4866aa812518e Kees Cook 2017-04-05 155 * On ia64 if a page has been mapped somewhere as a4866aa812518e Kees Cook 2017-04-05 156 * uncached, then it must also be accessed uncached a4866aa812518e Kees Cook 2017-04-05 157 * by the kernel or data corruption may occur. ^1da177e4c3f41 Linus Torvalds 2005-04-16 158 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 159 ptr = xlate_dev_mem_ptr(p); e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18 160 if (!ptr) 22ec1a2aea73b9 Kees Cook 2017-12-01 161 goto failed; a4866aa812518e Kees Cook 2017-04-05 162 fe557319aa06c2 Christoph Hellwig 2020-06-17 163 probe = copy_from_kernel_nofault(bounce, ptr, sz); e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18 @164 unxlate_dev_mem_ptr(p, ptr); b5b38200ebe548 Kees Cook 2018-03-27 165 if (probe) 22ec1a2aea73b9 Kees Cook 2017-12-01 166 goto failed; 22ec1a2aea73b9 Kees Cook 2017-12-01 167 22ec1a2aea73b9 Kees Cook 2017-12-01 168 remaining = copy_to_user(buf, bounce, sz); a4866aa812518e Kees Cook 2017-04-05 169 } a4866aa812518e Kees Cook 2017-04-05 170 fa29e97bb8c70f Wu Fengguang 2009-12-14 171 if (remaining) 22ec1a2aea73b9 Kees Cook 2017-12-01 172 goto failed; e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18 173 ^1da177e4c3f41 Linus Torvalds 2005-04-16 174 buf += sz; ^1da177e4c3f41 Linus Torvalds 2005-04-16 175 p += sz; ^1da177e4c3f41 Linus Torvalds 2005-04-16 176 count -= sz; ^1da177e4c3f41 Linus Torvalds 2005-04-16 177 read += sz; 8619e5bdeee8b2 Tetsuo Handa 2019-08-26 178 if (should_stop_iteration()) 8619e5bdeee8b2 Tetsuo Handa 2019-08-26 179 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 180 } 22ec1a2aea73b9 Kees Cook 2017-12-01 181 kfree(bounce); ^1da177e4c3f41 Linus Torvalds 2005-04-16 182 ^1da177e4c3f41 Linus Torvalds 2005-04-16 183 *ppos += read; ^1da177e4c3f41 Linus Torvalds 2005-04-16 184 return read; 22ec1a2aea73b9 Kees Cook 2017-12-01 185 22ec1a2aea73b9 Kees Cook 2017-12-01 186 failed: 22ec1a2aea73b9 Kees Cook 2017-12-01 187 kfree(bounce); 22ec1a2aea73b9 Kees Cook 2017-12-01 188 return err; ^1da177e4c3f41 Linus Torvalds 2005-04-16 189 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 190 :::::: The code at line 164 was first introduced by commit :::::: e045fb2a988a9a1964059b0d33dbaf18d12f925f x86: PAT avoid aliasing in /dev/mem read/write :::::: TO: venkatesh.pallipadi@xxxxxxxxx <venkatesh.pallipadi@xxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
