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- # SPDX-License-Identifier: GPL-2.0
- # include/asm-generic contains a lot of files that are used
- # verbatim by several architectures.
- #
- # This Makefile reads the file arch/$(SRCARCH)/include/(uapi/)/asm/Kbuild
- # and for each file listed in this file with generic-y creates
- # a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
- PHONY := all
- all:
- src := $(subst /generated,,$(obj))
- -include $(src)/Kbuild
- # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
- ifneq ($(SRCARCH),um)
- include $(generic)/Kbuild
- endif
- include scripts/Kbuild.include
- redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
- redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
- redundant := $(sort $(redundant))
- $(if $(redundant),\
- $(warning redundant generic-y found in $(src)/Kbuild: $(redundant)))
- # If arch does not implement mandatory headers, fallback to asm-generic ones.
- mandatory-y := $(filter-out $(generated-y), $(mandatory-y))
- generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(srctree)/$(src)/$(f)),,$(f)))
- generic-y := $(addprefix $(obj)/, $(generic-y))
- generated-y := $(addprefix $(obj)/, $(generated-y))
- # Remove stale wrappers when the corresponding files are removed from generic-y
- old-headers := $(wildcard $(obj)/*.h)
- unwanted := $(filter-out $(generic-y) $(generated-y),$(old-headers))
- quiet_cmd_wrap = WRAP $@
- cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
- quiet_cmd_remove = REMOVE $(unwanted)
- cmd_remove = rm -f $(unwanted)
- all: $(generic-y)
- $(if $(unwanted),$(call cmd,remove))
- @:
- $(obj)/%.h:
- $(call cmd,wrap)
- # Create output directory. Skip it if at least one old header exists
- # since we know the output directory already exists.
- ifeq ($(old-headers),)
- $(shell mkdir -p $(obj))
- endif
- .PHONY: $(PHONY)
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