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# SPDX-License-Identifier: GPL-2.0 # # kbuild file for usr/ - including initramfs image # klibcdirs:; PHONY += klibcdirs suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) datafile_y = initramfs_data.cpio$(suffix_y) datafile_d_y = .$(datafile_y).d AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" # clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all # possible compression formats. clean-files += initramfs_data.cpio* # Generate builtin.o based on initramfs_data.o obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o # initramfs_data.o contains the compressed initramfs_data.cpio image. # The image is included using .incbin, a dependency which is not # tracked automatically. $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE ##### # Generate the initramfs cpio archive hostprogs-y := gen_init_cpio initramfs := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) ramfs-args := \ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) # $(datafile_d_y) is used to identify all files included # in initramfs and to detect if any files are added/removed. # Removed files are identified by directory timestamp being updated # The dependency list is generated by gen_initramfs.sh -l ifneq ($(wildcard $(obj)/$(datafile_d_y)),) include $(obj)/$(datafile_d_y) endif quiet_cmd_initfs = GEN $@ cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) targets := $(datafile_y) # do not try to update files included in initramfs $(deps_initramfs): ; $(deps_initramfs): klibcdirs # 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 $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y) $(call if_changed,initfs) subdir-$(CONFIG_UAPI_HEADER_TEST) += include |