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There is an increasing amount of header files
shared between individual architectures in asm-generic.
To avoid a lot of dummy wrapper files that just
include the corresponding file in asm-generic provide
some basic support in kbuild for this.
With the following patch an architecture can maintain
a list of files in the file arch/$(ARCH)/include/asm/Kbuild
To use a generic file just add:
generic-y += <name-of-header-file.h>
For each file listed kbuild will generate the necessary
wrapper in arch/$(ARCH)/include/generated/asm.
When installing userspace headers a wrapper is likewise created.
The original inspiration for this came from the unicore32
patchset - although a different method is used.
The patch includes several improvements from Arnd Bergmann.
Michael Marek contributed Makefile.asm-generic.
Remis Baima did an intial implementation along to achive
the same - see https://patchwork.kernel.org/patch/13352/
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>
Tested-by: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Remis Lima Baima <remis.developer@googlemail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
112 lines
3.7 KiB
Makefile
112 lines
3.7 KiB
Makefile
# ==========================================================================
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# Installing headers
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#
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# header-y - list files to be installed. They are preprocessed
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# to remove __KERNEL__ section of the file
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# objhdr-y - Same as header-y but for generated files
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#
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# ==========================================================================
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# called may set destination dir (when installing to asm/)
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_dst := $(if $(dst),$(dst),$(obj))
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kbuild-file := $(srctree)/$(obj)/Kbuild
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include $(kbuild-file)
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_dst := $(if $(destination-y),$(destination-y),$(_dst))
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include scripts/Kbuild.include
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install := $(INSTALL_HDR_PATH)/$(_dst)
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header-y := $(sort $(header-y))
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subdirs := $(patsubst %/,%,$(filter %/, $(header-y)))
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header-y := $(filter-out %/, $(header-y))
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# files used to track state of install/check
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install-file := $(install)/.install
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check-file := $(install)/.check
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# generic-y list all files an architecture uses from asm-generic
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# Use this to build a list of headers which require a wrapper
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wrapper-files := $(filter $(header-y), $(generic-y))
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# all headers files for this dir
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header-y := $(filter-out $(generic-y), $(header-y))
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all-files := $(header-y) $(objhdr-y) $(wrapper-files)
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input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
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$(addprefix $(objtree)/$(obj)/,$(objhdr-y))
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output-files := $(addprefix $(install)/, $(all-files))
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# Work out what needs to be removed
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oldheaders := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))
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unwanted := $(filter-out $(all-files),$(oldheaders))
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# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
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unwanted-file := $(addprefix $(install)/, $(unwanted))
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printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
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quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
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file$(if $(word 2, $(all-files)),s))
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cmd_install = \
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$(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
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$(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
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for F in $(wrapper-files); do \
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echo "\#include <asm-generic/$$F>" > $(install)/$$F; \
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done; \
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touch $@
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quiet_cmd_remove = REMOVE $(unwanted)
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cmd_remove = rm -f $(unwanted-file)
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quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
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# Headers list can be pretty long, xargs helps to avoid
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# the "Argument list too long" error.
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cmd_check = for f in $(all-files); do \
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echo "$(install)/$${f}"; done \
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| xargs \
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$(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
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touch $@
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PHONY += __headersinst __headerscheck
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ifndef HDRCHECK
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# Rules for installing headers
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__headersinst: $(subdirs) $(install-file)
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@:
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targets += $(install-file)
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$(install-file): scripts/headers_install.pl $(input-files) FORCE
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$(if $(unwanted),$(call cmd,remove),)
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$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
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$(call if_changed,install)
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else
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__headerscheck: $(subdirs) $(check-file)
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@:
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targets += $(check-file)
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$(check-file): scripts/headers_check.pl $(output-files) FORCE
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$(call if_changed,check)
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endif
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# Recursion
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hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
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.PHONY: $(subdirs)
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$(subdirs):
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$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
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targets := $(wildcard $(sort $(targets)))
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cmd_files := $(wildcard \
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$(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
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ifneq ($(cmd_files),)
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include $(cmd_files)
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endif
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.PHONY: $(PHONY)
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PHONY += FORCE
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FORCE: ;
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