# SPDX-License-Identifier: GPL-2.0## kbuild file for usr/ - including initramfs image# compress-y					:= copycompress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP)	:= gzipcompress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)	:= bzip2compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA)	:= lzmacompress-$(CONFIG_INITRAMFS_COMPRESSION_XZ)	:= xzmisccompress-$(CONFIG_INITRAMFS_COMPRESSION_LZO)	:= lzocompress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4)	:= lz4compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD)	:= zstd obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data ramfs-input := $(CONFIG_INITRAMFS_SOURCE)cpio-data := # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the# default contents.ifeq ($(ramfs-input),)ramfs-input := $(srctree)/$(src)/default_cpio_listendif ifeq ($(words $(ramfs-input)),1) # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with# .cpio, use it directly as an initramfs.ifneq ($(filter %.cpio,$(ramfs-input)),)cpio-data := $(ramfs-input)endif # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with# .cpio.*, use it directly as an initramfs, and avoid double compression.ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)cpio-data := $(ramfs-input)compress-y := copyendif endif # For other cases, generate the initramfs cpio archive based on the contents# specified by CONFIG_INITRAMFS_SOURCE.ifeq ($(cpio-data),) cpio-data := $(obj)/initramfs_data.cpio hostprogs := gen_init_cpio # .initramfs_data.cpio.d is used to identify all files included# in initramfs and to detect if any files are added/removed.# Removed files are identified by directory timestamp being updated# The dependency list is generated by gen_initramfs.sh -l-include $(obj)/.initramfs_data.cpio.d # do not try to update files included in initramfs$(deps_initramfs): ; quiet_cmd_initfs = GEN     $@      cmd_initfs = \	$(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \	$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \	$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \	$(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \	$(ramfs-input) # We rebuild initramfs_data.cpio if:# 1) Any included file is newer than initramfs_data.cpio# 2) There are changes in which files are included (added or deleted)# 3) If gen_init_cpio are newer than initramfs_data.cpio# 4) Arguments to gen_initramfs.sh changes$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE	$(call if_changed,initfs) endif $(obj)/initramfs_inc_data: $(cpio-data) FORCE	$(call if_changed,$(compress-y)) targets += initramfs_data.cpio initramfs_inc_data subdir-$(CONFIG_UAPI_HEADER_TEST) += include