# ==========================================================================# Installing headers## header-y  - list files to be installed. They are preprocessed#             to remove __KERNEL__ section of the file# objhdr-y  - Same as header-y but for generated files## ========================================================================== # called may set destination dir (when installing to asm/)_dst := $(if $(dst),$(dst),$(obj)) kbuild-file := $(srctree)/$(obj)/Kbuildinclude $(kbuild-file) _dst := $(if $(destination-y),$(destination-y),$(_dst)) include scripts/Kbuild.include install       := $(INSTALL_HDR_PATH)/$(_dst) header-y      := $(sort $(header-y))subdirs       := $(patsubst %/,%,$(filter %/, $(header-y)))header-y      := $(filter-out %/, $(header-y)) # files used to track state of install/checkinstall-file  := $(install)/.installcheck-file    := $(install)/.check # generic-y list all files an architecture uses from asm-generic# Use this to build a list of headers which require a wrapperwrapper-files := $(filter $(header-y), $(generic-y)) # all headers files for this dirheader-y      := $(filter-out $(generic-y), $(header-y))all-files     := $(header-y) $(objhdr-y) $(wrapper-files)input-files   := $(addprefix $(srctree)/$(obj)/,$(header-y)) \                 $(addprefix $(objtree)/$(obj)/,$(objhdr-y))output-files  := $(addprefix $(install)/, $(all-files)) # Work out what needs to be removedoldheaders    := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))unwanted      := $(filter-out $(all-files),$(oldheaders)) # Prefix unwanted with full paths to $(INSTALL_HDR_PATH)unwanted-file := $(addprefix $(install)/, $(unwanted)) printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@)) quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\                            file$(if $(word 2, $(all-files)),s))      cmd_install = \        $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \        $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \        for F in $(wrapper-files); do                                   \                echo "\#include <asm-generic/$$F>" > $(install)/$$F;    \        done;                                                           \        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 $(all-files); do                          \                  echo "$(install)/$${f}"; done                      \                  | xargs                                            \                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \	          touch $@ PHONY += __headersinst __headerscheck ifndef HDRCHECK# Rules for installing headers__headersinst: $(subdirs) $(install-file)	@: targets += $(install-file)$(install-file): scripts/headers_install.pl $(input-files) FORCE	$(if $(unwanted),$(call cmd,remove),)	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))	$(call if_changed,install) else__headerscheck: $(subdirs) $(check-file)	@: targets += $(check-file)$(check-file): scripts/headers_check.pl $(output-files) FORCE	$(call if_changed,check) endif # Recursionhdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj.PHONY: $(subdirs)$(subdirs):	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@ targets := $(wildcard $(sort $(targets)))cmd_files := $(wildcard \             $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),)	include $(cmd_files)endif .PHONY: $(PHONY)PHONY += FORCEFORCE: ;