Extern or forward variable declaration at include/linux/swap.h, line 118 References: drivers/staging/pohmelfs/inode.c, line 141 drivers/staging/pohmelfs/inode.c, line 399 fs/btrfs/disk-io.c, line 746 fs/btrfs/disk-io.c, line 776 fs/btrfs/extent_io.c, line 2143 fs/btrfs/extent_io.c, line 2158 fs/btrfs/extent_io.c, line 2426 fs/btrfs/extent_io.c, line 2544 fs/btrfs/extent_io.c, line 2555 fs/btrfs/extent_io.c, line 2588 fs/btrfs/extent_io.c, line 2618 fs/btrfs/inode.c, line 4341 fs/btrfs/inode.c, line 6239 fs/btrfs/inode.c, line 6254 fs/buffer.c, line 1627 fs/buffer.c, line 2611 fs/buffer.c, line 2816 fs/buffer.c, line 2857 fs/gfs2/aops.c, line 96 fs/gfs2/aops.c, line 131 fs/gfs2/aops.c, line 150 fs/gfs2/aops.c, line 179 fs/gfs2/aops.c, line 204 fs/gfs2/aops.c, line 242 fs/gfs2/aops.c, line 259 fs/gfs2/aops.c, line 330 fs/gfs2/aops.c, line 393 fs/gfs2/meta_io.c, line 35 fs/nfs/write.c, line 175 fs/nfs/write.c, line 284 fs/nfs/write.c, line 304 fs/nfs/write.c, line 319 fs/nfs/write.c, line 328 fs/nfs/write.c, line 337 fs/nfs/write.c, line 1429 fs/nfs/write.c, line 1461 fs/nfs/write.c, line 1467 fs/nfs/write.c, line 1477 fs/nfs/write.c, line 1523 fs/nilfs2/mdt.c, line 376 fs/ntfs/aops.c, line 551 fs/ntfs/aops.c, line 921 fs/ntfs/aops.c, line 1354 fs/ocfs2/aops.c, line 397 fs/reiserfs/inode.c, line 1627 fs/reiserfs/inode.c, line 2330 fs/reiserfs/inode.c, line 2545 include/linux/swap.h, line 118 include/linux/swap.h, line 307 include/linux/swap.h, line 437 mm/filemap.c, line 219 mm/migrate.c, line 499 mm/page-writeback.c, line 492 mm/page-writeback.c, line 864 mm/page-writeback.c, line 1022 mm/page-writeback.c, line 1040 mm/page-writeback.c, line 1051 mm/page-writeback.c, line 1077 mm/page-writeback.c, line 1190 mm/page_io.c, line 92 mm/shmem.c, line 1035 mm/swapfile.c, line 1261 mm/vmscan.c, line 425