tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git set_fs-2 head: cb5b88c78bb9c229c93bf11ea66d622a3ba4bf2d commit: 5c46fbe679aaca0b693101e743e46ba571403b7c [12/17] uaccess: fix type mismatch warnings from access_ok() config: mips-randconfig-s031-20220216 (https://download.01.org/0day-ci/archive/20220216/202202161630.LUggdKp0-lk...) compiler: mips-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # 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 set_fs-2 git checkout 5c46fbe679aaca0b693101e743e46ba571403b7c # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) command-line: note: in included file: builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQUIRE redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_SEQ_CST redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQ_REL redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_RELEASE redefined builtin:0:0: sparse: this was the original definition lib/test_lockup.c:422:13: sparse: expected char const *__gk_ptr lib/test_lockup.c:422:13: sparse: got void [noderef] __user *ptr lib/test_lockup.c:423:13: sparse: expected char const *__gk_ptr lib/test_lockup.c:423:13: sparse: got void [noderef] __user * lib/test_lockup.c:230:9: sparse: sparse: context imbalance in 'test_lock' - wrong count at exit lib/test_lockup.c:250:25: sparse: sparse: context imbalance in 'test_unlock' - unexpected unlock vim +422 lib/test_lockup.c 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 410 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 411 static bool test_kernel_ptr(unsigned long addr, int size) 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 412 { 5c46fbe679aaca Arnd Bergmann 2022-02-14 413 void __user *ptr = (void __user *)addr; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 414 char buf; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 415 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 416 if (!addr) 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 417 return false; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 418 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 419 /* should be at least readable kernel address */ 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 420 if (access_ok(ptr, 1) || 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 421 access_ok(ptr + size - 1, 1) || 25f12ae45fc193 Christoph Hellwig 2020-06-17 @422 get_kernel_nofault(buf, ptr) || 25f12ae45fc193 Christoph Hellwig 2020-06-17 @423 get_kernel_nofault(buf, ptr + size - 1)) { 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 424 pr_err("invalid kernel ptr: %#lx\n", addr); 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 425 return true; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 426 } 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 427 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 428 return false; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 429 } 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 430 :::::: The code at line 422 was first introduced by commit :::::: 25f12ae45fc1931a1dce3cc59f9989a9d87834b0 maccess: rename probe_kernel_address to get_kernel_nofault :::::: TO: Christoph Hellwig <hch(a)lst.de&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