How to skip building kernel modules

[Jacob Kroon <jacob.kroon@gmail.com>]

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Hi,

I'm using the linux-yocto kernel recipes together with additional kernel 
config fragments that I append in our custom distro layer. All required 
functionality is built into the kernel, so we don't install any kernel 
modules on target.

What would be the correct way to save compilation time and skip 
building/packaging the kernel modules ? Do I need to provide a custom 
defconfig that explicitly disables all modules ?

I can monkey-patch oe-core with the attached patch in order to achieve 
that goal, but I'm guessing something like this wouldn't be suitable for 
upstreaming ?

Cheers,
Jacob


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From: Jacob Kroon <jacob.kroon@gmail.com>
Date: Mon, 16 Mar 2020 09:47:58 +0100
Subject: [PATCH] Handle KERNEL_MODULES

---
 meta/classes/kernel.bbclass | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index a724645466..538e769f89 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -329,7 +329,12 @@ kernel_do_compile() {
 	fi
 }
 
+KERNEL_MODULES ?= "1"
+
 do_compile_kernelmodules() {
+	if [ "${KERNEL_MODULES}" = "0" ]; then
+		exit 0
+	fi
 	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
 	if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then
 		cc_extra=$(get_cc_option)
@@ -353,7 +358,7 @@ kernel_do_install() {
 	# First install the modules
 	#
 	unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
-	if (grep -q -i -e '^CONFIG_MODULES=y$' .config); then
+	if [ "${KERNEL_MODULES}" = "1" ] && (grep -q -i -e '^CONFIG_MODULES=y$' .config); then
 		oe_runmake DEPMOD=echo MODLIB=${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION} INSTALL_FW_PATH=${D}${nonarch_base_libdir}/firmware modules_install
 		rm "${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION}/build"
 		rm "${D}${nonarch_base_libdir}/modules/${KERNEL_VERSION}/source"