tree: https://github.com/zen-kernel/zen-kernel 5.10/futex2 head: 65d8ec592b14a8c75ce2a04bfef5a188cd279d00 commit: 4f6d01d9753e7ff0e6ca0ab6082f8b75256cdb57 [1/13] futex2: Implement wait and wake functions config: m68k-randconfig-r034-20210217 (attached as .config) compiler: m68k-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/zen-kernel/zen-kernel/commit/4f6d01d9753e7ff0e6ca0ab60... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.10/futex2 git checkout 4f6d01d9753e7ff0e6ca0ab6082f8b75256cdb57 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>): In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/preempt.h:11, from arch/m68k/include/asm/irqflags.h:6, from include/linux/irqflags.h:16, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/debug_locks.h:5, from include/linux/freezer.h:7, from kernel/futex2.c:16: kernel/futex2.c: In function 'futex_get_bucket': 163 | if (unlikely(!access_ok(address, sizeof(u32)))) | ^~~~~~~ | | | uintptr_t {aka long unsigned int} include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ In file included from include/linux/uaccess.h:11, from include/linux/sched/task.h:11, from include/linux/sched/signal.h:9, from include/linux/rcuwait.h:6, from include/linux/percpu-rwsem.h:7, from include/linux/fs.h:33, from include/linux/huge_mm.h:8, from include/linux/mm.h:687, from include/linux/memblock.h:13, from kernel/futex2.c:18: arch/m68k/include/asm/uaccess.h:16:48: note: expected 'const void *' but argument is of type 'uintptr_t' {aka 'long unsigned int'} 16 | static inline int access_ok(const void __user *addr, | ~~~~~~~~~~~~~~~~~~~^~~~ vim +/access_ok +163 kernel/futex2.c 145 146 /** 147 * futex_get_bucket - Check if the user address is valid, prepare internal 148 * data and calculate the hash 149 * @uaddr: futex user address 150 * @key: data that uniquely identifies a futex 151 * 152 * Return: address of bucket on success, error code otherwise 153 */ 154 static struct futex_bucket *futex_get_bucket(void __user *uaddr, 155 struct futex_key *key) 156 { 157 uintptr_t address = (uintptr_t)uaddr; 158 u32 hash_key; 159 160 /* Checking if uaddr is valid and accessible */ 161 if (unlikely(!IS_ALIGNED(address, sizeof(u32)))) 162 return ERR_PTR(-EINVAL); 164 return ERR_PTR(-EFAULT); 165 166 key->offset = address % PAGE_SIZE; 167 address -= key->offset; 168 key->pointer = (u64)address; 169 key->index = (unsigned long)current->mm; 170 171 /* Generate hash key for this futex using uaddr and current->mm */ 172 hash_key = jhash2((u32 *)key, sizeof(*key) / sizeof(u32), 0); 173 174 /* Since HASH_SIZE is 2^n, subtracting 1 makes a perfect bit mask */ 175 return &futex_table[hash_key & (futex2_hashsize - 1)]; 176 } 177 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org