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Date: Thu, 1 Jun 2017 21:55:53 +0800
From: kbuild test robot <lkp@...el.com>
To: Jan Kara <jack@...e.cz>
Cc: kbuild-all@...org, linux-mm@...ck.org,
Hugh Dickins <hughd@...gle.com>,
David Howells <dhowells@...hat.com>,
linux-afs@...ts.infradead.org,
Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
linux-nilfs@...r.kernel.org, Bob Peterson <rpeterso@...hat.com>,
cluster-devel@...hat.com, Jaegeuk Kim <jaegeuk@...nel.org>,
linux-f2fs-devel@...ts.sourceforge.net, tytso@....edu,
linux-ext4@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
"Yan, Zheng" <zyan@...hat.com>, ceph-devel@...r.kernel.org,
linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>,
"Darrick J . Wong" <darrick.wong@...cle.com>,
linux-xfs@...r.kernel.org,
Nadia Yvette Chambers <nyc@...omorphy.com>,
Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 31/35] shmem: Convert to pagevec_lookup_entries_range()
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@...e.cz>
:::::: CC: 0day robot <fengguang.wu@...el.com>
---
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