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kernel.mk: Allow building external kernel modules

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Here, we introduce the TARGET_EXTERNAL_KERNEL_MODULES variable
for the list of external modules.

Change-Id: I1f8b7a48e66bb0c9efbc396692e5a7159f0b835c
This commit is contained in:
Neel Chauhan 2022-07-21 09:30:48 -07:00 committed by Andrzej Perczak
parent c6da5c129d
commit f0ffb00ad5
2 changed files with 25 additions and 0 deletions
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16
build/tasks/kernel.mk
View File

@ -278,6 +278,14 @@ define internal-make-kernel-target
$(PATH_OVERRIDE) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(KERNEL_SRC) O=$(KERNEL_BUILD_OUT_PREFIX)$(1) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_LD) $(2)
endef
# Make an external module target
# $(1): module name
# $(2): module root path
# $(3): target to build (eg. modules_install)
define make-external-module-target
$(PATH_OVERRIDE) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(TARGET_KERNEL_EXT_MODULE_ROOT)/$(1) M=$(2)/$(1) KERNEL_SRC=$(BUILD_TOP)/$(KERNEL_SRC) OUT_DIR=$(KERNEL_BUILD_OUT_PREFIX)$(KERNEL_OUT) O=$(KERNEL_BUILD_OUT_PREFIX)$(KERNEL_OUT) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) $(KERNEL_CLANG_TRIPLE) $(KERNEL_CC) $(KERNEL_LD) $(3)
endef
# Generate kernel .config from a given defconfig
# $(1): Output path (The value passed to O=)
# $(2): The defconfig to process (just the filename, no need for full path to file)
@ -414,6 +422,14 @@ $(TARGET_PREBUILT_INT_KERNEL): $(KERNEL_CONFIG) $(DEPMOD) $(DTC)
$(call make-kernel-target,modules) || exit "$$?"; \
echo "Installing Kernel Modules"; \
$(call make-kernel-target,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) INSTALL_MOD_STRIP=1 modules_install); \
$(if $(TARGET_KERNEL_EXT_MODULES),\
echo "Building and Installing External Kernel Modules"; \
rpath=$$(python3 -c 'import os,sys;print(os.path.relpath(*(sys.argv[1:])))' $(TARGET_KERNEL_EXT_MODULE_ROOT) $(KERNEL_SRC)); \
$(foreach p, $(TARGET_KERNEL_EXT_MODULES),\
$$pwd; \
$(call make-external-module-target,$(p),$$rpath,); \
$(call make-external-module-target,$(p),$$rpath,INSTALL_MOD_PATH=$(MODULES_INTERMEDIATES) INSTALL_MOD_STRIP=1 KERNEL_UAPI_HEADERS_DIR=$(KERNEL_OUT) modules_install)); \
) \
kernel_release=$$(cat $(KERNEL_RELEASE)) \
kernel_modules_dir=$(MODULES_INTERMEDIATES)/lib/modules/$$kernel_release \
$(foreach s, $(TARGET_MODULE_ALIASES),\

9
config/BoardConfigKernel.mk
View File

@ -38,6 +38,11 @@
# TARGET_KERNEL_DTB = Name of the kernel Makefile target that
# generates the *.dtb targets. Defaults to dtbs
#
# TARGET_KERNEL_EXT_MODULE_ROOT = Optional, the external modules root directory
# Defaults to empty
# TARGET_KERNEL_EXT_MODULES = Optional, the external modules we are
# building. Defaults to empty
#
# KERNEL_TOOLCHAIN_PREFIX = Overrides TARGET_KERNEL_CROSS_COMPILE_PREFIX,
# Set this var in shell to override
# toolchain specified in BoardConfig.mk
@ -156,6 +161,10 @@ endif
# Set the default dtb target
TARGET_KERNEL_DTB ?= dtbs
# Set no external modules by default
TARGET_KERNEL_EXT_MODULE_ROOT ?=
TARGET_KERNEL_EXT_MODULES ?=
# Set use the full path to the make command
KERNEL_MAKE_CMD := $(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/make