tracing: Allow gcov profiling on only ftrace subsystem (6b7dca40) · Commits · 戴 / test

Add GCOV_PROFILE_FTRACE to allow gcov profiling on only files in ftrace subsystem. This config option will be used for checking kselftest/ftrace coverage. Link: http://lkml.kernel.org/r/153483647755.32472.4746349899604275441.stgit@devbox Signed-off-by:

kernel/trace/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -774,6 +774,18 @@ config TRACING_EVENTS_GPIO
		help
		Enable tracing events for gpio subsystem

		config GCOV_PROFILE_FTRACE
		bool "Enable GCOV profiling on ftrace subsystem"
		depends on GCOV_KERNEL
		help
		Enable GCOV profiling on ftrace subsystem for checking
		which functions/lines are tested.

		If unsure, say N.

		Note that on a kernel compiled with this config, ftrace will
		run significantly slower.

		endif # FTRACE

		endif # TRACING_SUPPORT

+5 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,11 @@ ifdef CONFIG_TRACING_BRANCHES
		KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
		endif

		# for GCOV coverage profiling
		ifdef CONFIG_GCOV_PROFILE_FTRACE
		GCOV_PROFILE := y
		endif

		CFLAGS_trace_benchmark.o := -I$(src)
		CFLAGS_trace_events_filter.o := -I$(src)