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Some time ago, Sam pointed out a certain degree of overwrap between generic-y and mandatory-y. (https://lkml.org/lkml/2017/7/10/121) I tweaked the meaning of mandatory-y a little bit; now it defines the minimum set of ASM headers that all architectures must have. If arch does not have specific implementation of a mandatory header, Kbuild will let it fallback to the asm-generic one by automatically generating a wrapper. This will allow to drop lots of redundant generic-y defines. Previously, "mandatory" was used in the context of UAPI, but I guess this can be extended to kernel space ASM headers. Suggested-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Sam Ravnborg <sam@ravnborg.org>
47 lines
1.4 KiB
Text
47 lines
1.4 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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# include/asm-generic contains a lot of files that are used
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# verbatim by several architectures.
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#
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# This Makefile reads the file arch/$(SRCARCH)/include/(uapi/)/asm/Kbuild
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# and for each file listed in this file with generic-y creates
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# a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
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PHONY := all
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all:
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src := $(subst /generated,,$(obj))
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-include $(src)/Kbuild
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include scripts/Kbuild.include
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# If arch does not implement mandatory headers, fallback to asm-generic ones.
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mandatory-y := $(filter-out $(generated-y), $(mandatory-y))
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generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(srctree)/$(src)/$(f)),,$(f)))
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generic-y := $(addprefix $(obj)/, $(generic-y))
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generated-y := $(addprefix $(obj)/, $(generated-y))
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# Remove stale wrappers when the corresponding files are removed from generic-y
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old-headers := $(wildcard $(obj)/*.h)
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unwanted := $(filter-out $(generic-y) $(generated-y),$(old-headers))
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quiet_cmd_wrap = WRAP $@
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cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
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quiet_cmd_remove = REMOVE $(unwanted)
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cmd_remove = rm -f $(unwanted)
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all: $(generic-y)
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$(if $(unwanted),$(call cmd,remove))
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@:
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$(obj)/%.h:
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$(call cmd,wrap)
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# Create output directory. Skip it if at least one old header exists
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# since we know the output directory already exists.
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ifeq ($(old-headers),)
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$(shell mkdir -p $(obj))
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endif
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.PHONY: $(PHONY)
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