1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
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+++ b/kernel/gcov/Kconfig
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+# SPDX-License-Identifier: GPL-2.0-only
+menu "GCOV-based kernel profiling"
+
+config GCOV_KERNEL
+	bool "Enable gcov-based kernel profiling"
+	depends on DEBUG_FS
+	depends on !ARCH_WANTS_NO_INSTR || CC_HAS_NO_PROFILE_FN_ATTR
+	select CONSTRUCTORS
+	default n
+	help
+	This option enables gcov-based code profiling (e.g. for code coverage
+	measurements).
+
+	If unsure, say N.
+
+	Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
+	for the entire kernel. To enable profiling for specific files or
+	directories, add a line similar to the following to the respective
+	Makefile:
+
+	For a single file (e.g. main.o):
+	        GCOV_PROFILE_main.o := y
+
+	For all files in one directory:
+	        GCOV_PROFILE := y
+
+	To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
+	is specified, use:
+
+	        GCOV_PROFILE_main.o := n
+	and:
+	        GCOV_PROFILE := n
+
+	Note that the debugfs filesystem has to be mounted to access
+	profiling data.
+
+config ARCH_HAS_GCOV_PROFILE_ALL
+	def_bool n
+
+config GCOV_PROFILE_ALL
+	bool "Profile entire Kernel"
+	depends on !COMPILE_TEST
+	depends on GCOV_KERNEL
+	depends on ARCH_HAS_GCOV_PROFILE_ALL
+	default n
+	help
+	This options activates profiling for the entire kernel.
+
+	If unsure, say N.
+
+	Note that a kernel compiled with profiling flags will be significantly
+	larger and run slower. Also be sure to exclude files from profiling
+	which are not linked to the kernel image to prevent linker errors.
+
+endmenu