+ ftrace_dep = $(srctree)/kernel/trace/trace.h
+ ftrace_dep_check = $(wildcard $(ftrace_dep))
+ ftrace = $(shell \
+ if [ $(VERSION) -ge 5 -o \( $(VERSION) -eq 4 -a $(PATCHLEVEL) -ge 12 \) ] ; then \
+ if [ -z "$(ftrace_dep_check)" ] ; then \
+ echo "warn" ; \
+ exit ; \
+ fi; \
+ echo "lttng-ftrace.o" ; \
+ fi;)
+ ifeq ($(ftrace),warn)
+ $(warning Files $(ftrace_dep) not found. Probe "ftrace" is disabled. Use full kernel source tree to enable it.)
+ ftrace =
+ endif # $(ftrace),warn
+ obj-$(CONFIG_LTTNG) += $(ftrace)