[kbuild-all] [linux-next:master 7126/9113] fs/ntfs3/fsntfs.c:1874:9: warning: variable 'cnt' set but not used

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 33e65b1f975cd2814fc0ea9617250fc4c1d7a553 commit: 6e5be40d32fb1907285277c02e74493ed43d77fe [7126/9113] fs/ntfs3: Add NTFS3 in fs/Kconfig and fs/Makefile config: riscv-buildonly-randconfig-r005-20210820 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d9c5613e856cf2addfbf892fc4c1ce9ef9feceaa) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 6e5be40d32fb1907285277c02e74493ed43d77fe # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 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 fs/ntfs3/fsntfs.c:8: In file included from include/linux/blkdev.h:18: In file included from include/linux/bio.h:8: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from fs/ntfs3/fsntfs.c:8: In file included from include/linux/blkdev.h:18: In file included from include/linux/bio.h:8: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from fs/ntfs3/fsntfs.c:8: In file included from include/linux/blkdev.h:18: In file included from include/linux/bio.h:8: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ size_t cnt, off; ^ 8 warnings generated. vim +/cnt +1874 fs/ntfs3/fsntfs.c 82cae269cfa953 Konstantin Komarov 2021-08-13 1858 82cae269cfa953 Konstantin Komarov 2021-08-13 1859 /* 82cae269cfa953 Konstantin Komarov 2021-08-13 1860 * ntfs_security_init 82cae269cfa953 Konstantin Komarov 2021-08-13 1861 * 82cae269cfa953 Konstantin Komarov 2021-08-13 1862 * loads and parse $Secure 82cae269cfa953 Konstantin Komarov 2021-08-13 1863 */ 82cae269cfa953 Konstantin Komarov 2021-08-13 1864 int ntfs_security_init(struct ntfs_sb_info *sbi) 82cae269cfa953 Konstantin Komarov 2021-08-13 1865 { 82cae269cfa953 Konstantin Komarov 2021-08-13 1866 int err; 82cae269cfa953 Konstantin Komarov 2021-08-13 1867 struct super_block *sb = sbi->sb; 82cae269cfa953 Konstantin Komarov 2021-08-13 1868 struct inode *inode; 82cae269cfa953 Konstantin Komarov 2021-08-13 1869 struct ntfs_inode *ni; 82cae269cfa953 Konstantin Komarov 2021-08-13 1870 struct MFT_REF ref; 82cae269cfa953 Konstantin Komarov 2021-08-13 1871 struct ATTRIB *attr; 82cae269cfa953 Konstantin Komarov 2021-08-13 1872 struct ATTR_LIST_ENTRY *le; 82cae269cfa953 Konstantin Komarov 2021-08-13 1873 u64 sds_size; 82cae269cfa953 Konstantin Komarov 2021-08-13 @1874 size_t cnt, off; 82cae269cfa953 Konstantin Komarov 2021-08-13 1875 struct NTFS_DE *ne; 82cae269cfa953 Konstantin Komarov 2021-08-13 1876 struct NTFS_DE_SII *sii_e; 82cae269cfa953 Konstantin Komarov 2021-08-13 1877 struct ntfs_fnd *fnd_sii = NULL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1878 const struct INDEX_ROOT *root_sii; 82cae269cfa953 Konstantin Komarov 2021-08-13 1879 const struct INDEX_ROOT *root_sdh; 82cae269cfa953 Konstantin Komarov 2021-08-13 1880 struct ntfs_index *indx_sdh = &sbi->security.index_sdh; 82cae269cfa953 Konstantin Komarov 2021-08-13 1881 struct ntfs_index *indx_sii = &sbi->security.index_sii; 82cae269cfa953 Konstantin Komarov 2021-08-13 1882 82cae269cfa953 Konstantin Komarov 2021-08-13 1883 ref.low = cpu_to_le32(MFT_REC_SECURE); 82cae269cfa953 Konstantin Komarov 2021-08-13 1884 ref.high = 0; 82cae269cfa953 Konstantin Komarov 2021-08-13 1885 ref.seq = cpu_to_le16(MFT_REC_SECURE); 82cae269cfa953 Konstantin Komarov 2021-08-13 1886 82cae269cfa953 Konstantin Komarov 2021-08-13 1887 inode = ntfs_iget5(sb, &ref, &NAME_SECURE); 82cae269cfa953 Konstantin Komarov 2021-08-13 1888 if (IS_ERR(inode)) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1889 err = PTR_ERR(inode); 82cae269cfa953 Konstantin Komarov 2021-08-13 1890 ntfs_err(sb, "Failed to load $Secure."); 82cae269cfa953 Konstantin Komarov 2021-08-13 1891 inode = NULL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1892 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1893 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1894 82cae269cfa953 Konstantin Komarov 2021-08-13 1895 ni = ntfs_i(inode); 82cae269cfa953 Konstantin Komarov 2021-08-13 1896 82cae269cfa953 Konstantin Komarov 2021-08-13 1897 le = NULL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1898 82cae269cfa953 Konstantin Komarov 2021-08-13 1899 attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SDH_NAME, 82cae269cfa953 Konstantin Komarov 2021-08-13 1900 ARRAY_SIZE(SDH_NAME), NULL, NULL); 82cae269cfa953 Konstantin Komarov 2021-08-13 1901 if (!attr) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1902 err = -EINVAL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1903 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1904 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1905 82cae269cfa953 Konstantin Komarov 2021-08-13 1906 root_sdh = resident_data(attr); 82cae269cfa953 Konstantin Komarov 2021-08-13 1907 if (root_sdh->type != ATTR_ZERO || 82cae269cfa953 Konstantin Komarov 2021-08-13 1908 root_sdh->rule != NTFS_COLLATION_TYPE_SECURITY_HASH) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1909 err = -EINVAL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1910 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1911 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1912 82cae269cfa953 Konstantin Komarov 2021-08-13 1913 err = indx_init(indx_sdh, sbi, attr, INDEX_MUTEX_SDH); 82cae269cfa953 Konstantin Komarov 2021-08-13 1914 if (err) 82cae269cfa953 Konstantin Komarov 2021-08-13 1915 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1916 82cae269cfa953 Konstantin Komarov 2021-08-13 1917 attr = ni_find_attr(ni, attr, &le, ATTR_ROOT, SII_NAME, 82cae269cfa953 Konstantin Komarov 2021-08-13 1918 ARRAY_SIZE(SII_NAME), NULL, NULL); 82cae269cfa953 Konstantin Komarov 2021-08-13 1919 if (!attr) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1920 err = -EINVAL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1921 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1922 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1923 82cae269cfa953 Konstantin Komarov 2021-08-13 1924 root_sii = resident_data(attr); 82cae269cfa953 Konstantin Komarov 2021-08-13 1925 if (root_sii->type != ATTR_ZERO || 82cae269cfa953 Konstantin Komarov 2021-08-13 1926 root_sii->rule != NTFS_COLLATION_TYPE_UINT) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1927 err = -EINVAL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1928 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1929 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1930 82cae269cfa953 Konstantin Komarov 2021-08-13 1931 err = indx_init(indx_sii, sbi, attr, INDEX_MUTEX_SII); 82cae269cfa953 Konstantin Komarov 2021-08-13 1932 if (err) 82cae269cfa953 Konstantin Komarov 2021-08-13 1933 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1934 82cae269cfa953 Konstantin Komarov 2021-08-13 1935 fnd_sii = fnd_get(); 82cae269cfa953 Konstantin Komarov 2021-08-13 1936 if (!fnd_sii) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1937 err = -ENOMEM; 82cae269cfa953 Konstantin Komarov 2021-08-13 1938 goto out; 82cae269cfa953 Konstantin Komarov 2021-08-13 1939 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1940 82cae269cfa953 Konstantin Komarov 2021-08-13 1941 sds_size = inode->i_size; 82cae269cfa953 Konstantin Komarov 2021-08-13 1942 82cae269cfa953 Konstantin Komarov 2021-08-13 1943 /* Find the last valid Id */ 82cae269cfa953 Konstantin Komarov 2021-08-13 1944 sbi->security.next_id = SECURITY_ID_FIRST; 82cae269cfa953 Konstantin Komarov 2021-08-13 1945 /* Always write new security at the end of bucket */ 82cae269cfa953 Konstantin Komarov 2021-08-13 1946 sbi->security.next_off = 82cae269cfa953 Konstantin Komarov 2021-08-13 1947 Quad2Align(sds_size - SecurityDescriptorsBlockSize); 82cae269cfa953 Konstantin Komarov 2021-08-13 1948 82cae269cfa953 Konstantin Komarov 2021-08-13 1949 cnt = 0; 82cae269cfa953 Konstantin Komarov 2021-08-13 1950 off = 0; 82cae269cfa953 Konstantin Komarov 2021-08-13 1951 ne = NULL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1952 82cae269cfa953 Konstantin Komarov 2021-08-13 1953 for (;;) { 82cae269cfa953 Konstantin Komarov 2021-08-13 1954 u32 next_id; 82cae269cfa953 Konstantin Komarov 2021-08-13 1955 82cae269cfa953 Konstantin Komarov 2021-08-13 1956 err = indx_find_raw(indx_sii, ni, root_sii, &ne, &off, fnd_sii); 82cae269cfa953 Konstantin Komarov 2021-08-13 1957 if (err || !ne) 82cae269cfa953 Konstantin Komarov 2021-08-13 1958 break; 82cae269cfa953 Konstantin Komarov 2021-08-13 1959 82cae269cfa953 Konstantin Komarov 2021-08-13 1960 sii_e = (struct NTFS_DE_SII *)ne; 82cae269cfa953 Konstantin Komarov 2021-08-13 1961 if (le16_to_cpu(ne->view.data_size) < SIZEOF_SECURITY_HDR) 82cae269cfa953 Konstantin Komarov 2021-08-13 1962 continue; 82cae269cfa953 Konstantin Komarov 2021-08-13 1963 82cae269cfa953 Konstantin Komarov 2021-08-13 1964 next_id = le32_to_cpu(sii_e->sec_id) + 1; 82cae269cfa953 Konstantin Komarov 2021-08-13 1965 if (next_id >= sbi->security.next_id) 82cae269cfa953 Konstantin Komarov 2021-08-13 1966 sbi->security.next_id = next_id; 82cae269cfa953 Konstantin Komarov 2021-08-13 1967 82cae269cfa953 Konstantin Komarov 2021-08-13 1968 cnt += 1; 82cae269cfa953 Konstantin Komarov 2021-08-13 1969 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1970 82cae269cfa953 Konstantin Komarov 2021-08-13 1971 sbi->security.ni = ni; 82cae269cfa953 Konstantin Komarov 2021-08-13 1972 inode = NULL; 82cae269cfa953 Konstantin Komarov 2021-08-13 1973 out: 82cae269cfa953 Konstantin Komarov 2021-08-13 1974 iput(inode); 82cae269cfa953 Konstantin Komarov 2021-08-13 1975 fnd_put(fnd_sii); 82cae269cfa953 Konstantin Komarov 2021-08-13 1976 82cae269cfa953 Konstantin Komarov 2021-08-13 1977 return err; 82cae269cfa953 Konstantin Komarov 2021-08-13 1978 } 82cae269cfa953 Konstantin Komarov 2021-08-13 1979 :::::: The code at line 1874 was first introduced by commit :::::: 82cae269cfa953032fbb8980a7d554d60fb00b17 fs/ntfs3: Add initialization of super block :::::: TO: Konstantin Komarov <almaz.alexandrovich(a)paragon-software.com&gt; :::::: CC: Konstantin Komarov <almaz.alexandrovich(a)paragon-software.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org