From: Cixi Geng <redacted>

Introduce new configuration option GCOV_PROFILE_PREREQS that can be
used to check whether the prerequisites for enabling gcov profiling
for specific files and directories are met.

Only add SERIAL_GCOV for an example.

Signed-off-by: Cixi Geng <redacted>
---
 drivers/tty/serial/Kconfig  |  7 +++++++
 drivers/tty/serial/Makefile |  1 +
 kernel/gcov/Kconfig         | 12 ++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 780908d43557..55b128b6b31d 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig

@@ -1576,3 +1576,10 @@ endmenu

 config SERIAL_MCTRL_GPIO
        tristate
+
+config SERIAL_GCOV
+       bool "Enable profile gcov for serial directory"
+       depends on GCOV_PROFILE_PREREQS
+       help
+         The SERIAL_GCOV will add Gcov profiling flags when kernel compiles.
+         Say 'Y' here if you want the gcov data for the serial directory,

diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index d056ee6cca33..17272733db95 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile

@@ -3,6 +3,7 @@
 # Makefile for the kernel serial device drivers.
 #

+GCOV_PROFILE := $(CONFIG_SERIAL_GCOV)
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o

 obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 3110c77230c7..bb2e1fb85743 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig

@@ -51,4 +51,16 @@ config GCOV_PROFILE_ALL
        larger and run slower. Also be sure to exclude files from profiling
        which are not linked to the kernel image to prevent linker errors.

+config GCOV_PROFILE_PREREQS
+       bool "Profile Kernel for prereqs"
+       depends on GCOV_KERNEL
+       depends on  !COMPILE_TEST
+       def_bool y if GCOV_KERNEL && !COMPILE_TEST
+       help
+         This options activates profiling for the specified kernel modules.
+
+         When some modules need Gcov data, enable this config, then configure
+         with gcov on the corresponding modules,The directories or files of
+         these modules will be added profiling flags after kernel compile.
+
 endmenu
--

2.17.1