Hi Jan, [auto build test WARNING on linus/master] [also build test WARNING on v4.12-rc3] [cannot apply to next-20170601] [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/Jan-Kara/pagevec-API-cleanups/20170601-200653 config: i386-randconfig-x078-06010927 (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=i386 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 >>): Cyclomatic Complexity 1 include/linux/huge_mm.h:split_huge_page Cyclomatic Complexity 1 include/linux/radix-tree.h:radix_tree_insert Cyclomatic Complexity 10 mm/shmem.c:shmem_add_to_page_cache Cyclomatic Complexity 2 include/linux/highmem.h:clear_highpage Cyclomatic Complexity 1 mm/shmem.c:shmem_confirm_swap Cyclomatic Complexity 2 include/linux/mm.h:put_page Cyclomatic Complexity 7 mm/shmem.c:shmem_write_end Cyclomatic Complexity 4 mm/shmem.c:shmem_replace_page Cyclomatic Complexity 13 mm/shmem.c:shmem_unused_huge_shrink Cyclomatic Complexity 69 mm/shmem.c:shmem_getpage_gfp Cyclomatic Complexity 2 mm/shmem.c:shmem_unused_huge_scan Cyclomatic Complexity 1 mm/shmem.c:shmem_put_link Cyclomatic Complexity 11 mm/shmem.c:shmem_fault Cyclomatic Complexity 1 mm/shmem.c:synchronous_wake_function Cyclomatic Complexity 1 include/linux/sched.h:cond_resched_rcu Cyclomatic Complexity 5 mm/shmem.c:find_swap_entry Cyclomatic Complexity 2 include/linux/pagemap.h:linear_page_index Cyclomatic Complexity 2 include/linux/pagevec.h:pagevec_release Cyclomatic Complexity 1 include/linux/pagevec.h:pagevec_lookup Cyclomatic Complexity 2 include/linux/pagemap.h:page_to_pgoff Cyclomatic Complexity 2 mm/shmem.c:shmem_free_swap Cyclomatic Complexity 8 mm/shmem.c:shmem_unuse_inode Cyclomatic Complexity 1 include/linux/fs.h:inode_lock Cyclomatic Complexity 1 include/linux/fs.h:inode_unlock Cyclomatic Complexity 2 include/linux/fs.h:file_accessed Cyclomatic Complexity 7 include/linux/khugepaged.h:khugepaged_enter Cyclomatic Complexity 2 mm/shmem.c:shmem_mmap Cyclomatic Complexity 12 mm/shmem.c:shmem_seek_hole_data Cyclomatic Complexity 8 mm/shmem.c:shmem_file_llseek Cyclomatic Complexity 2 include/linux/uaccess.h:copy_user_overflow Cyclomatic Complexity 2 include/linux/mm.h:page_mapcount Cyclomatic Complexity 8 mm/shmem.c:shmem_tag_pins Cyclomatic Complexity 13 mm/shmem.c:shmem_wait_for_pins Cyclomatic Complexity 2 include/linux/xattr.h:simple_xattrs_free Cyclomatic Complexity 1 include/linux/xattr.h:simple_xattrs_init Cyclomatic Complexity 7 mm/shmem.c:shmem_show_options Cyclomatic Complexity 1 include/linux/percpu_counter.h:percpu_counter_sum Cyclomatic Complexity 3 mm/shmem.c:shmem_statfs Cyclomatic Complexity 2 mm/shmem.c:shmem_destroy_inode Cyclomatic Complexity 2 mm/shmem.c:shmem_destroy_callback Cyclomatic Complexity 2 mm/shmem.c:shmem_alloc_inode Cyclomatic Complexity 3 mm/shmem.c:shmem_fh_to_dentry Cyclomatic Complexity 4 mm/shmem.c:shmem_encode_fh Cyclomatic Complexity 7 mm/shmem.c:shmem_parse_huge Cyclomatic Complexity 8 mm/shmem.c:shmem_enabled_store Cyclomatic Complexity 94 mm/shmem.c:shmem_parse_options Cyclomatic Complexity 9 mm/shmem.c:shmem_remount_fs Cyclomatic Complexity 6 mm/shmem.c:shmem_get_inode Cyclomatic Complexity 4 mm/shmem.c:shmem_tmpfile Cyclomatic Complexity 3 mm/shmem.c:shmem_exchange Cyclomatic Complexity 3 mm/shmem.c:shmem_unlink Cyclomatic Complexity 2 mm/shmem.c:shmem_rmdir Cyclomatic Complexity 2 include/linux/dcache.h:dget Cyclomatic Complexity 4 mm/shmem.c:shmem_mknod Cyclomatic Complexity 3 mm/shmem.c:shmem_whiteout Cyclomatic Complexity 9 mm/shmem.c:shmem_rename2 Cyclomatic Complexity 2 mm/shmem.c:shmem_mkdir Cyclomatic Complexity 1 mm/shmem.c:shmem_create Cyclomatic Complexity 2 mm/shmem.c:shmem_link Cyclomatic Complexity 2 mm/shmem.c:shmem_getattr Cyclomatic Complexity 1 mm/shmem.c:shmem_put_super Cyclomatic Complexity 7 mm/shmem.c:shmem_fill_super Cyclomatic Complexity 1 mm/shmem.c:shmem_mount Cyclomatic Complexity 1 mm/shmem.c:shmem_init_inodecache Cyclomatic Complexity 1 mm/shmem.c:shmem_init_inode Cyclomatic Complexity 1 mm/shmem.c:shmem_destroy_inodecache Cyclomatic Complexity 3 mm/shmem.c:shmem_enabled_show Cyclomatic Complexity 8 mm/shmem.c:__shmem_file_setup Cyclomatic Complexity 1 mm/shmem.c:shmem_getpage Cyclomatic Complexity 5 mm/shmem.c:shmem_write_begin Cyclomatic Complexity 36 mm/shmem.c:shmem_undo_range Cyclomatic Complexity 17 mm/shmem.c:shmem_file_read_iter Cyclomatic Complexity 8 mm/shmem.c:shmem_symlink Cyclomatic Complexity 5 mm/shmem.c:shmem_get_link Cyclomatic Complexity 1 mm/shmem.c:vma_is_shmem Cyclomatic Complexity 4 mm/shmem.c:shmem_charge Cyclomatic Complexity 2 mm/shmem.c:shmem_uncharge Cyclomatic Complexity 7 mm/shmem.c:shmem_partial_swap_usage Cyclomatic Complexity 4 mm/shmem.c:shmem_swap_usage Cyclomatic Complexity 3 mm/shmem.c:shmem_unlock_mapping Cyclomatic Complexity 1 mm/shmem.c:shmem_truncate_range Cyclomatic Complexity 19 mm/shmem.c:shmem_fallocate Cyclomatic Complexity 6 mm/shmem.c:shmem_evict_inode Cyclomatic Complexity 16 mm/shmem.c:shmem_setattr Cyclomatic Complexity 9 mm/shmem.c:shmem_unuse Cyclomatic Complexity 7 mm/shmem.c:shmem_lock Cyclomatic Complexity 1 mm/shmem.c:shmem_mapping Cyclomatic Complexity 16 mm/shmem.c:shmem_mcopy_atomic_pte Cyclomatic Complexity 9 mm/shmem.c:shmem_add_seals Cyclomatic Complexity 2 mm/shmem.c:shmem_get_seals Cyclomatic Complexity 3 mm/shmem.c:shmem_fcntl Cyclomatic Complexity 7 mm/shmem.c:shmem_init Cyclomatic Complexity 8 mm/shmem.c:shmem_huge_enabled Cyclomatic Complexity 1 mm/shmem.c:shmem_kernel_file_setup Cyclomatic Complexity 1 mm/shmem.c:shmem_file_setup Cyclomatic Complexity 11 mm/shmem.c:SYSC_memfd_create Cyclomatic Complexity 1 mm/shmem.c:SyS_memfd_create Cyclomatic Complexity 4 mm/shmem.c:shmem_zero_setup Cyclomatic Complexity 2 mm/shmem.c:shmem_read_mapping_page_gfp mm/shmem.c: In function 'shmem_seek_hole_data': >> mm/shmem.c:2522:9: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^~~~ vim +/last +2522 mm/shmem.c 220f2ac9 Hugh Dickins 2012-12-12 2506 page = pvec.pages[i]; 220f2ac9 Hugh Dickins 2012-12-12 2507 if (page && !radix_tree_exceptional_entry(page)) { 220f2ac9 Hugh Dickins 2012-12-12 2508 if (!PageUptodate(page)) 220f2ac9 Hugh Dickins 2012-12-12 2509 page = NULL; 220f2ac9 Hugh Dickins 2012-12-12 2510 } eb675e81 Jan Kara 2017-06-01 2511 if ((page && whence == SEEK_DATA) || 965c8e59 Andrew Morton 2012-12-17 2512 (!page && whence == SEEK_HOLE)) { 220f2ac9 Hugh Dickins 2012-12-12 2513 done = true; 220f2ac9 Hugh Dickins 2012-12-12 2514 break; 220f2ac9 Hugh Dickins 2012-12-12 2515 } 220f2ac9 Hugh Dickins 2012-12-12 2516 } 0cd6144a Johannes Weiner 2014-04-03 2517 pagevec_remove_exceptionals(&pvec); 220f2ac9 Hugh Dickins 2012-12-12 2518 pagevec_release(&pvec); 220f2ac9 Hugh Dickins 2012-12-12 2519 pvec.nr = PAGEVEC_SIZE; 220f2ac9 Hugh Dickins 2012-12-12 2520 cond_resched(); 220f2ac9 Hugh Dickins 2012-12-12 2521 } 1d162ad5 Jan Kara 2017-06-01 @2522 return last; 220f2ac9 Hugh Dickins 2012-12-12 2523 } 220f2ac9 Hugh Dickins 2012-12-12 2524 965c8e59 Andrew Morton 2012-12-17 2525 static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence) 220f2ac9 Hugh Dickins 2012-12-12 2526 { 220f2ac9 Hugh Dickins 2012-12-12 2527 struct address_space *mapping = file->f_mapping; 220f2ac9 Hugh Dickins 2012-12-12 2528 struct inode *inode = mapping->host; 220f2ac9 Hugh Dickins 2012-12-12 2529 pgoff_t start, end; 220f2ac9 Hugh Dickins 2012-12-12 2530 loff_t new_offset; :::::: The code at line 2522 was first introduced by commit :::::: 1d162ad5252576fa97d38e96e6e09fd9165f5d6b mm: Make pagevec_lookup_entries() update index :::::: TO: Jan Kara <jack@xxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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