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.
Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
Changes in v2.1:
- Fix description according to Steve's comment.
---
kernel/trace/Kconfig | 12 ++++++++++++
kernel/trace/Makefile | 5 +++++
2 files changed, 17 insertions(+)
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)
