rump_component_count
int rump_component_count(enum rump_component_type);
if (rump_component_count(RUMP_COMPONENT_DEV) > 0
|| rump_component_count(RUMP_COMPONENT_DEV_AFTERMAINBUS) > 0) {
if (rump_component_count(RUMP__FACTION_VFS)) {
if (rump_component_count(RUMP__FACTION_VFS) == 0) {
KASSERT(rump_component_count(RUMP__FACTION_VFS) <= 1
&& rump_component_count(RUMP__FACTION_NET) <= 1
&& rump_component_count(RUMP__FACTION_DEV) <= 1);