Hi Liu, [auto build test WARNING on tip/perf/core] [also build test WARNING on v4.9-rc8 next-20161207] [cannot apply to btrfs/next] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Liu-Bo/btrfs-dax-IO/20161208-082651 config: x86_64-randconfig-x001-201649 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): fs/btrfs/file.c: In function 'btrfs_file_write_iter': >> fs/btrfs/file.c:1823:5: warning: 'oldsize' may be used uninitialized in this function [-Wmaybe-uninitialized] if (oldsize < pos) ^ fs/btrfs/file.c:1809:9: note: 'oldsize' was declared here loff_t oldsize; ^~~~~~~ vim +/oldsize +1823 fs/btrfs/file.c 1807 struct inode *inode = file_inode(file); 1808 loff_t pos; 1809 loff_t oldsize; 1810 ssize_t ret; 1811 1812 inode_lock(inode); 1813 ret = btrfs_file_write_check(iocb, from); 1814 if (ret) 1815 goto out; 1816 1817 current->backing_dev_info = inode_to_bdi(inode); 1818 1819 pos = iocb->ki_pos; 1820 ret = __btrfs_buffered_write(file, from, pos); 1821 if (ret > 0) 1822 iocb->ki_pos = pos + ret; > 1823 if (oldsize < pos) 1824 pagecache_isize_extended(inode, oldsize, 1825 i_size_read(inode)); 1826 1827 current->backing_dev_info = NULL; 1828 out: 1829 inode_unlock(inode); 1830 return ret; 1831 } --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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