Extern or forward variable declaration at include/linux/swap.h, line 117 References: drivers/staging/pohmelfs/inode.c, line 141 drivers/staging/pohmelfs/inode.c, line 894 fs/btrfs/disk-io.c, line 677 fs/btrfs/disk-io.c, line 708 fs/btrfs/extent_io.c, line 2157 fs/btrfs/extent_io.c, line 2172 fs/btrfs/extent_io.c, line 2444 fs/btrfs/extent_io.c, line 2565 fs/btrfs/extent_io.c, line 2576 fs/btrfs/extent_io.c, line 2610 fs/btrfs/extent_io.c, line 2641 fs/btrfs/inode.c, line 4829 fs/btrfs/inode.c, line 4844 fs/buffer.c, line 1637 fs/buffer.c, line 2664 fs/buffer.c, line 2869 fs/buffer.c, line 2910 fs/gfs2/aops.c, line 96 fs/gfs2/aops.c, line 131 fs/gfs2/aops.c, line 153 fs/gfs2/aops.c, line 182 fs/gfs2/aops.c, line 207 fs/gfs2/aops.c, line 245 fs/gfs2/aops.c, line 262 fs/gfs2/aops.c, line 339 fs/gfs2/aops.c, line 408 fs/gfs2/meta_io.c, line 35 fs/nfs/write.c, line 177 fs/nfs/write.c, line 281 fs/nfs/write.c, line 295 fs/nfs/write.c, line 310 fs/nfs/write.c, line 319 fs/nfs/write.c, line 328 fs/nfs/write.c, line 1417 fs/nfs/write.c, line 1468 fs/nfs/write.c, line 1487 fs/nfs/write.c, line 1516 fs/nfs/write.c, line 1560 fs/nilfs2/mdt.c, line 395 fs/ntfs/aops.c, line 550 fs/ntfs/aops.c, line 920 fs/ntfs/aops.c, line 1353 fs/ocfs2/aops.c, line 398 fs/reiserfs/inode.c, line 2312 fs/reiserfs/inode.c, line 2527 include/linux/swap.h, line 117 include/linux/swap.h, line 287 include/linux/swap.h, line 405 mm/filemap.c, line 216 mm/migrate.c, line 480 mm/page-writeback.c, line 497 mm/page-writeback.c, line 821 mm/page-writeback.c, line 995 mm/page-writeback.c, line 1013 mm/page-writeback.c, line 1024 mm/page-writeback.c, line 1050 mm/page-writeback.c, line 1149 mm/page_io.c, line 96 mm/shmem.c, line 1026 mm/swapfile.c, line 1219 mm/vmscan.c, line 393