From: Masami Hiramatsu Date: Tue, 21 Aug 2018 07:27:58 +0000 (+0900) Subject: tracing: Allow gcov profiling on only ftrace subsystem X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=6b7dca401cb1;p=openwrt%2Fstaging%2Fblogic.git tracing: Allow gcov profiling on only ftrace subsystem 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: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) --- diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index fd6754b88f87..aec44d838283 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -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 diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index 98d53b39a8ee..f81dadbc7c4a 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -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)