tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.4 head: 6a08a9e7fb1525fa296d810d200954f6c18d07a2 commit: a128d6484ea6c26f6266bd8d93c62346436bfd4e [12/14] squashfs: add more sanity checks in inode lookup config: arc-allyesconfig (attached as .config) compiler: arceb-elf-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/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-4.4 git checkout a128d6484ea6c26f6266bd8d93c62346436bfd4e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 arch/arc/include/asm/bug.h:32, from include/linux/bug.h:4, from include/linux/thread_info.h:11, from include/asm-generic/preempt.h:4, from arch/arc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/wait.h:8, from include/linux/fs.h:5, from fs/squashfs/export.c:38: include/linux/cpumask.h: In function 'cpumask_check': include/linux/cpumask.h:117:19: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 117 | WARN_ON_ONCE(cpu >= nr_cpumask_bits); | ^~ include/asm-generic/bug.h:112:27: note: in definition of macro 'WARN_ON_ONCE' 112 | int __ret_warn_once = !!(condition); \ | ^~~~~~~~~ In file included from fs/squashfs/export.c:44: fs/squashfs/squashfs_fs.h: In function 'squashfs_block_size': fs/squashfs/squashfs_fs.h:135:24: warning: operand of ?: changes signedness from 'int' to 'u32' {aka 'unsigned int'} due to unsignedness of other operand [-Wsign-compare] 135 | return (size >> 25) ? -EIO : size; fs/squashfs/export.c: In function 'squashfs_inode_lookup': 63 | if (ino_num == 0 || (ino_num - 1) >= msblk->inodes) | ^~ fs/squashfs/export.c: In function 'squashfs_read_inode_lookup_table': fs/squashfs/export.c:164:16: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare] 164 | for (n = 0; n < (indexes - 1); n++) { | ^ vim +63 fs/squashfs/export.c 48 49 /* 50 * Look-up inode number (ino) in table, returning the inode location. 51 */ 52 static long long squashfs_inode_lookup(struct super_block *sb, int ino_num) 53 { 54 struct squashfs_sb_info *msblk = sb->s_fs_info; 55 int blk = SQUASHFS_LOOKUP_BLOCK(ino_num - 1); 56 int offset = SQUASHFS_LOOKUP_BLOCK_OFFSET(ino_num - 1); 57 u64 start; 58 __le64 ino; 59 int err; 60 61 TRACE("Entered squashfs_inode_lookup, inode_number = %d\n", ino_num); 62 64 return -EINVAL; 65 66 start = le64_to_cpu(msblk->inode_lookup_table[blk]); 67 68 err = squashfs_read_metadata(sb, &ino, &start, &offset, sizeof(ino)); 69 if (err < 0) 70 return err; 71 72 TRACE("squashfs_inode_lookup, inode = 0x%llx\n", 73 (u64) le64_to_cpu(ino)); 74 75 return le64_to_cpu(ino); 76 } 77 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org