Index: sys/compat/linuxkpi/common/include/linux/swap.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/swap.h
+++ sys/compat/linuxkpi/common/include/linux/swap.h
@@ -29,6 +29,13 @@
 #ifndef	_LINUXKPI_LINUX_SWAP_H_
 #define	_LINUXKPI_LINUX_SWAP_H_
 
+#include <sys/param.h>
+#include <sys/domainset.h>
+#include <sys/queue.h>
+#include <sys/proc.h>
+#include <sys/pcpu.h>
+
+#include <vm/vm.h>
 #include <vm/swap_pager.h>
 #include <vm/vm_pageout.h>