mm/swapfile.c:2550:24: error: use of undeclared identifier 'swap_active_head'; did you mean 'swap_avail_head'?
mm/swapfile.c:2655:27: error: use of undeclared identifier 'swap_active_head'; did you mean 'swap_avail_head'?
mm/swapfile.c:2677:23: error: use of undeclared identifier 'swap_active_head'; did you mean 'swap_avail_head'?
mm/swapfile.c:3835:28: error: use of undeclared identifier 'swap_active_head'; did you mean 'swap_avail_head'?