xref: /openbmc/linux/kernel/gcov/Kconfig (revision ba61bb17)
1menu "GCOV-based kernel profiling"
2
3config GCOV_KERNEL
4	bool "Enable gcov-based kernel profiling"
5	depends on DEBUG_FS
6	select CONSTRUCTORS if !UML
7	default n
8	---help---
9	This option enables gcov-based code profiling (e.g. for code coverage
10	measurements).
11
12	If unsure, say N.
13
14	Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
15	for the entire kernel. To enable profiling for specific files or
16	directories, add a line similar to the following to the respective
17	Makefile:
18
19	For a single file (e.g. main.o):
20	        GCOV_PROFILE_main.o := y
21
22	For all files in one directory:
23	        GCOV_PROFILE := y
24
25	To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
26	is specified, use:
27
28	        GCOV_PROFILE_main.o := n
29	and:
30	        GCOV_PROFILE := n
31
32	Note that the debugfs filesystem has to be mounted to access
33	profiling data.
34
35config ARCH_HAS_GCOV_PROFILE_ALL
36	def_bool n
37
38config GCOV_PROFILE_ALL
39	bool "Profile entire Kernel"
40	depends on !COMPILE_TEST
41	depends on GCOV_KERNEL
42	depends on ARCH_HAS_GCOV_PROFILE_ALL
43	default n
44	---help---
45	This options activates profiling for the entire kernel.
46
47	If unsure, say N.
48
49	Note that a kernel compiled with profiling flags will be significantly
50	larger and run slower. Also be sure to exclude files from profiling
51	which are not linked to the kernel image to prevent linker errors.
52
53choice
54	prompt "Specify GCOV format"
55	depends on GCOV_KERNEL
56	---help---
57	The gcov format is usually determined by the GCC version, and the
58	default is chosen according to your GCC version. However, there are
59	exceptions where format changes are integrated in lower-version GCCs.
60	In such a case, change this option to adjust the format used in the
61	kernel accordingly.
62
63config GCOV_FORMAT_3_4
64	bool "GCC 3.4 format"
65	depends on CC_IS_GCC && GCC_VERSION < 40700
66	---help---
67	Select this option to use the format defined by GCC 3.4.
68
69config GCOV_FORMAT_4_7
70	bool "GCC 4.7 format"
71	---help---
72	Select this option to use the format defined by GCC 4.7.
73
74endchoice
75
76endmenu
77