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authorMasami Hiramatsu <mhiramat@kernel.org>2018-08-21 16:27:58 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-08-21 09:11:49 -0400
commit6b7dca401cb148603158119c89319c85228a2a61 (patch)
tree80cf732b6323ea9da7ded1eebe90c917cc08df86 /kernel/trace
parentbb730b5833b5bddf5cb226865e5f4496770d00b0 (diff)
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 <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/Kconfig12
-rw-r--r--kernel/trace/Makefile5
2 files changed, 17 insertions, 0 deletions
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)