# SPDX-License-Identifier: GPL-2.0# ===========================================================================# Module versions# ===========================================================================## Stage one of module building created the following:# a) The individual .o files used for the module# b) A <module>.o file which is the .o files above linked together# c) A <module>.mod file, listing the name of the preliminary <module>.o file,#    plus all .o files# d) modules.order, which lists all the modules # Stage 2 is handled by this file and does the following# 1) Find all modules listed in modules.order# 2) modpost is then used to# 3)  create one <module>.mod.c file pr. module# 4)  create one Module.symvers file with CRC for all exported symbols # Step 3 is used to place certain information in the module's ELF# section, including information such as:#   Version magic (see include/linux/vermagic.h for full details)#     - Kernel release#     - SMP is CONFIG_SMP#     - PREEMPT is CONFIG_PREEMPT[_RT]#     - GCC Version#   Module info#     - Module version (MODULE_VERSION)#     - Module alias'es (MODULE_ALIAS)#     - Module license (MODULE_LICENSE)#     - See include/linux/module.h for more details # Step 4 is solely used to allow module versioning in external modules,# where the CRC of each module is retrieved from the Module.symvers file. # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined# symbols in the final module linking stage# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.# This is solely useful to speed up test compiles PHONY := __modpost__modpost: include include/config/auto.confinclude scripts/Kbuild.include kernelsymfile := $(objtree)/Module.symversmodulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers MODPOST = scripts/mod/modpost						\	$(if $(CONFIG_MODVERSIONS),-m)					\	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)			\	$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)			\	$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS)))	\	$(if $(KBUILD_EXTMOD),-o $(modulesymfile))			\	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)			\	$(if $(KBUILD_MODPOST_WARN),-w) ifdef MODPOST_VMLINUX quiet_cmd_modpost = MODPOST vmlinux.o      cmd_modpost = $(MODPOST) vmlinux.o __modpost:	$(call cmd,modpost) else MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) ifeq ($(KBUILD_EXTMOD),)MODPOST += $(wildcard vmlinux)else # set src + obj - they may be used in the modules's Makefileobj := $(KBUILD_EXTMOD)src := $(obj) # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLSinclude $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \             $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)endif # find all modules listed in modules.ordermodules := $(sort $(shell cat $(MODORDER))) # Read out modules.order instead of expanding $(modules) to pass in modpost.# Otherwise, allmodconfig would fail with "Argument list too long".quiet_cmd_modpost = MODPOST $(words $(modules)) modules      cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST) __modpost:	@$(kecho) '  Building modules, stage 2.'	$(call cmd,modpost)ifneq ($(KBUILD_MODPOST_NOFINAL),1)	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinalendif endif .PHONY: $(PHONY)