Extern or forward variable declaration at include/linux/swap.h, line 327 References: arch/sparc/mm/init_32.c, line 83 arch/tile/mm/pgtable.c, line 65 include/linux/swap.h, line 196 include/linux/swap.h, line 327 include/linux/swap.h, line 389 mm/mmap.c, line 124 mm/nommu.c, line 1898 mm/swap_state.c, line 66 mm/swapfile.c, line 47 mm/swapfile.c, line 452 mm/swapfile.c, line 454 mm/swapfile.c, line 480 mm/swapfile.c, line 495 mm/swapfile.c, line 502 mm/swapfile.c, line 590 mm/swapfile.c, line 1614 mm/swapfile.c, line 1639 mm/swapfile.c, line 2110 mm/swapfile.c, line 2181 mm/vmscan.c, line 1098 mm/vmscan.c, line 1741 mm/vmscan.c, line 2751 mm/vmscan.c, line 2765