From: Cixi Geng <cixi.geng1@xxxxxxxxxx> The CONFIG_GCOV_PROFILE_ALL will compile kernel by profiling entire kernel which will lead to kernel run slower.Use GCOV_PROFILE_PREREQS to control part of the kernel modules to open gcov. Only add SERIAL_GCOV for an example. Signed-off-by: Cixi Geng <cixi.geng1@xxxxxxxxxx> --- drivers/tty/serial/Kconfig | 7 +++++++ drivers/tty/serial/Makefile | 1 + kernel/gcov/Kconfig | 14 ++++++++++++++ 3 files changed, 22 insertions(+) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index adf9e80e7dc9..6df002370f18 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1566,3 +1566,10 @@ 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 3941a9c48f83..ea8b514f5676 100644 --- a/kernel/gcov/Kconfig +++ b/kernel/gcov/Kconfig @@ -51,6 +51,20 @@ 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 subsytem" + depends on !COMPILE_TEST + depends on GCOV_KERNEL + depends on !GCOV_PROFILE_ALL + 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. + + If unsure, say N. + choice prompt "Specify GCOV format" depends on GCOV_KERNEL -- 2.17.1
