.PHONY: all clean all_kernel all_user clean_kernel clean_user nyi all: all_kernel all_user all_kernel: @ cd kernel && $(MAKE) all all_user: @ cd user && $(MAKE) all clean: clean_kernel clean_user clean_kernel: @ cd kernel && $(MAKE) clean clean_user: @ cd user && $(MAKE) clean nyi: @ cd kernel && $(MAKE) nyi