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Subject[PATCH 01/25] tracing: Allow gcov profiling on only ftrace subsystem
Date
Add GCOV_PROFILE_FTRACE to allow gcov profiling
on only files in ftrace subsystem. This kconfig
flag will be used for checking kselftest/ftrace
coverage.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
kernel/trace/Kconfig | 13 +++++++++++++
kernel/trace/Makefile | 5 +++++
2 files changed, 18 insertions(+)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index a47f77d27673..a628e8cbc1ef 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -722,6 +722,19 @@ 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 flags, ftrace will be
+ significantly run slower. So do not enable it for production
+ kernel.
+
endif # FTRACE

endif # TRACING_SUPPORT
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index e2538c7638d4..443d53392f61 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -18,6 +18,11 @@ 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)

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