Hi lianzhi, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.11-rc3 next-20210114] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/lianzhi-chang/udf-fix-the-proble... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 65f0d2414b7079556fbbcc070b3d1c9f9587606d config: mips-randconfig-r026-20210114 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6077d55381a6aa3e947ef7abdc36a7515c598c8a) 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/0day-ci/linux/commit/76a7c356fa5bfe473a3d7c15bda5922c9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review lianzhi-chang/udf-fix-the-problem-that-the-disc-content-is-not-displayed/20210114-161012 git checkout 76a7c356fa5bfe473a3d7c15bda5922c902a33f7 # 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 errors (new ones prefixed by >>): In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:257:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic, int, subu, ll, sc) ^ arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from fs/udf/super.c:41: In file included from fs/udf/udfdecl.h:10: In file included from include/linux/fs.h:6: In file included from include/linux/wait_bit.h:8: In file included from include/linux/wait.h:9: In file included from include/linux/spinlock.h:51: In file included from include/linux/preempt.h:78: In file included from ./arch/mips/include/generated/asm/preempt.h:1: In file included from include/asm-generic/preempt.h:5: In file included from include/linux/thread_info.h:56: In file included from arch/mips/include/asm/thread_info.h:16: In file included from arch/mips/include/asm/processor.h:14: In file included from include/linux/atomic.h:7: arch/mips/include/asm/atomic.h:261:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd) ^ arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from fs/udf/super.c:41: In file included from fs/udf/udfdecl.h:10: In file included from include/linux/fs.h:6: In file included from include/linux/wait_bit.h:8: In file included from include/linux/wait.h:9: In file included from include/linux/spinlock.h:59: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: include/linux/llist.h:237:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] return xchg(&head->first, NULL); ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from fs/udf/super.c:41: In file included from fs/udf/udfdecl.h:10: In file included from include/linux/fs.h:6: In file included from include/linux/wait_bit.h:8: In file included from include/linux/wait.h:9: In file included from include/linux/spinlock.h:59: In file included from include/linux/lockdep.h:27: include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] return xchg(&debug_locks, 0); ^ arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from fs/udf/super.c:41: In file included from fs/udf/udfdecl.h:12: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:8: In file included from include/linux/mm.h:33: In file included from include/linux/pgtable.h:6: arch/mips/include/asm/pgtable.h:202:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL); ^ arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64' cmpxchg((ptr), (o), (n)); \ ^ arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ In file included from fs/udf/super.c:41: In file included from fs/udf/udfdecl.h:12: In file included from include/linux/buffer_head.h:14: In file included from include/linux/pagemap.h:8: In file included from include/linux/mm.h:33: In file included from include/linux/pgtable.h:6: arch/mips/include/asm/pgtable.h:202:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare] arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64' cmpxchg((ptr), (o), (n)); \ ^ arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg' if (!__SYNC_loongson3_war) \ ^ arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war' # define __SYNC_loongson3_war (1 << 31) ^ sector_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits); ^ 12 warnings and 1 error generated. vim +716 fs/udf/super.c 693 694 /* 695 * Check Volume Structure Descriptors (ECMA 167 2/9.1) 696 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) 697 * @return 1 if NSR02 or NSR03 found, 698 * -1 if first sector read error, 0 otherwise 699 */ 700 static int udf_check_vsd(struct super_block *sb) 701 { 702 struct volStructDesc *vsd = NULL; 703 loff_t sector = VSD_FIRST_SECTOR_OFFSET; 704 int sectorsize; 705 struct buffer_head *bh = NULL; 706 int nsr = 0; 707 struct udf_sb_info *sbi; 708 loff_t sector_offset; 709 710 sbi = UDF_SB(sb); 711 if (sb->s_blocksize < sizeof(struct volStructDesc)) 712 sectorsize = sizeof(struct volStructDesc); 713 else 714 sectorsize = sb->s_blocksize; 715 717 sector += sector_offset; 718 719 udf_debug("Starting at sector %u (%lu byte sectors)\n", 720 (unsigned int)(sector >> sb->s_blocksize_bits), 721 sb->s_blocksize); 722 /* Process the sequence (if applicable). The hard limit on the sector 723 * offset is arbitrary, hopefully large enough so that all valid UDF 724 * filesystems will be recognised. There is no mention of an upper 725 * bound to the size of the volume recognition area in the standard. 726 * The limit will prevent the code to read all the sectors of a 727 * specially crafted image (like a bluray disc full of CD001 sectors), 728 * potentially causing minutes or even hours of uninterruptible I/O 729 * activity. This actually happened with uninitialised SSD partitions 730 * (all 0xFF) before the check for the limit and all valid IDs were 731 * added */ 732 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) { 733 /* Read a block */ 734 bh = udf_tread(sb, sector >> sb->s_blocksize_bits); 735 if (!bh) 736 break; 737 738 vsd = (struct volStructDesc *)(bh->b_data + 739 (sector & (sb->s_blocksize - 1))); 740 nsr = identify_vsd(vsd); 741 /* Found NSR or end? */ 742 if (nsr) { 743 brelse(bh); 744 break; 745 } 746 /* 747 * Special handling for improperly formatted VRS (e.g., Win10) 748 * where components are separated by 2048 bytes even though 749 * sectors are 4K 750 */ 751 if (sb->s_blocksize == 4096) { 752 nsr = identify_vsd(vsd + 1); 753 /* Ignore unknown IDs... */ 754 if (nsr < 0) 755 nsr = 0; 756 } 757 brelse(bh); 758 } 759 760 if (nsr > 0) 761 return 1; 762 else if (!bh && sector - sector_offset == VSD_FIRST_SECTOR_OFFSET) 763 return -1; 764 else 765 return 0; 766 } 767 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org