tree: https://github.com/zen-kernel/zen-kernel 5.11/futex2 head: ea9a7956b5f6f44f3ee70d82542c64fcb7c86c5e commit: a64bf661d4fc6dbfde640bf002eae2e22884a419 [1/13] futex2: Implement wait and wake functions config: mips-randconfig-r036-20210218 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/zen-kernel/zen-kernel/commit/a64bf661d4fc6dbfde640bf00... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.11/futex2 git checkout a64bf661d4fc6dbfde640bf002eae2e22884a419 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 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 >>): if (unlikely(!access_ok(address, sizeof(u32)))) ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/mips/include/asm/uaccess.h:134:21: note: expanded from macro 'access_ok' likely(__access_ok((addr), (size))) ^ include/linux/compiler.h:77:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ arch/mips/include/asm/uaccess.h:127:50: note: passing argument to parameter 'p' here static inline int __access_ok(const void __user *p, unsigned long size) ^ 1 warning generated. vim +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