obj-y += update.o
  obj-$(CONFIG_SRCU) += srcu.o

  obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o

  obj-$(CONFIG_TREE_RCU) += tree.o

  obj-$(CONFIG_PREEMPT_RCU) += tree.o

  obj-$(CONFIG_TREE_RCU_TRACE) += tree_trace.o
  obj-$(CONFIG_TINY_RCU) += tiny.o