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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>
This commit is contained in:
Masami Hiramatsu 2018-08-21 16:27:58 +09:00 committed by Steven Rostedt (VMware)
parent bb730b5833
commit 6b7dca401c
2 changed files with 17 additions and 0 deletions
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12
kernel/trace/Kconfig
View File

@ -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
kernel/trace/Makefile
View File

@ -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)