Include <machine/bus.h> and <machine/resource.h> here (only in the

kernel).  No other sys/*.h file requires machine/foo.h to be included
before it.  In addition, all the files that include rman.h would need
to include those two anyway.  From these two perspectives, it is
traditional to include things like this.

This lets us stop treating sys/rman.h specially in every bus frontend
file.

sys/sys/rman.h

@@ -34,6 +34,9 @@
 
 #ifndef	_KERNEL
 #include <sys/queue.h>
+#else
+#include <machine/bus.h>
+#include <machine/resource.h>
 #endif
 
 #define	RF_ALLOCATED	0x0001	/* resource has been reserved */