# SPDX-License-Identifier: GPL-2.0# ==========================================================================# Installing headers## All headers under include/uapi, include/generated/uapi,# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are# exported.# They are preprocessed to remove __KERNEL__ section of the file.## ========================================================================== PHONY := __headers__headers: include scripts/Kbuild.include srcdir        := $(srctree)/$(obj) # When make is run under a fakechroot environment, the function# $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular# files. So, we are using a combination of sort/dir/wildcard which works# with fakechroot.subdirs       := $(patsubst $(srcdir)/%/,%,\		 $(filter-out $(srcdir)/,\		 $(sort $(dir $(wildcard $(srcdir)/*/))))) # Recursion__headers: $(subdirs) PHONY += $(subdirs)$(subdirs):	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@ # Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi.# We have only sub-directories there.skip-inst := $(if $(filter %/uapi,$(obj)),1) ifeq ($(skip-inst),) # Kbuild file is optionalkbuild-file := $(srctree)/$(obj)/Kbuild-include $(kbuild-file) installdir    := $(INSTALL_HDR_PATH)/$(dst)gendir        := $(objtree)/$(subst include/,include/generated/,$(obj))header-files  := $(notdir $(wildcard $(srcdir)/*.h))header-files  := $(filter-out $(no-export-headers), $(header-files))genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))genhdr-files  := $(filter-out $(header-files), $(genhdr-files)) # files used to track state of install/checkinstall-file  := $(installdir)/.installcheck-file    := $(installdir)/.check # all headers files for this dirall-files     := $(header-files) $(genhdr-files)output-files  := $(addprefix $(installdir)/, $(all-files)) # Work out what needs to be removedoldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))unwanted      := $(filter-out $(all-files),$(oldheaders)) # Prefix unwanted with full paths to $(INSTALL_HDR_PATH)unwanted-file := $(addprefix $(installdir)/, $(unwanted)) printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@)) quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\                            file$(if $(word 2, $(all-files)),s))      cmd_install = \        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \        touch $@ quiet_cmd_remove = REMOVE  $(unwanted)      cmd_remove = rm -f $(unwanted-file) quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)# Headers list can be pretty long, xargs helps to avoid# the "Argument list too long" error.      cmd_check = for f in $(all-files); do                          \                  echo "$(installdir)/$${f}"; done                      \                  | xargs                                            \                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \	          touch $@ ifndef HDRCHECK# Rules for installing headers__headers: $(install-file)	@: targets += $(install-file)$(install-file): scripts/headers_install.sh \		 $(addprefix $(srcdir)/,$(header-files)) \		 $(addprefix $(gendir)/,$(genhdr-files)) FORCE	$(if $(unwanted),$(call cmd,remove),)	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))	$(call if_changed,install) else__headers: $(check-file)	@: targets += $(check-file)$(check-file): scripts/headers_check.pl $(output-files) FORCE	$(call if_changed,check) endif cmd_files := $(wildcard \             $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),)	include $(cmd_files)endif endif # skip-inst PHONY += FORCEFORCE: ; .PHONY: $(PHONY)