LXR linux/usr/Makefile

   1# SPDX-License-Identifier: GPL-2.0
   2#
   3# kbuild file for usr/ - including initramfs image
   4#
   5
   6klibcdirs:;
   7PHONY += klibcdirs
   8
   9suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
  10datafile_y = initramfs_data.cpio$(suffix_y)
  11datafile_d_y = .$(datafile_y).d
  12AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
  13
  14
  15# Generate builtin.o based on initramfs_data.o
  16obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  17
  18# initramfs_data.o contains the compressed initramfs_data.cpio image.
  19# The image is included using .incbin, a dependency which is not
  20# tracked automatically.
  21$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
  22
  23#####
  24# Generate the initramfs cpio archive
  25
  26hostprogs-y := gen_init_cpio
  27initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  28ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  29                        $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  30ramfs-args  := \
  31        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  32        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  33
  34# $(datafile_d_y) is used to identify all files included
  35# in initramfs and to detect if any files are added/removed.
  36# Removed files are identified by directory timestamp being updated
  37# The dependency list is generated by gen_initramfs.sh -l
  38ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
  39        include $(obj)/$(datafile_d_y)
  40endif
  41
  42quiet_cmd_initfs = GEN     $@
  43      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  44
  45targets := $(datafile_y)
  46
  47# do not try to update files included in initramfs
  48$(deps_initramfs): ;
  49
  50$(deps_initramfs): klibcdirs
  51# We rebuild initramfs_data.cpio if:
  52# 1) Any included file is newer then initramfs_data.cpio
  53# 2) There are changes in which files are included (added or deleted)
  54# 3) If gen_init_cpio are newer than initramfs_data.cpio
  55# 4) arguments to gen_initramfs.sh changes
  56$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  57        $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y)
  58        $(call if_changed,initfs)
  59