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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/scripts/Makefile.asm-generic
..
..
@@ -2,41 +2,57 @@
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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/$(SRCARCH)/include/$(src)/Kbuild
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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 $(obj) (arch/$(SRCARCH)/include/generated/$(src))
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+# a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
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 PHONY := all
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 all:
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-kbuild-file := $(srctree)/arch/$(SRCARCH)/include/$(src)/Kbuild
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--include $(kbuild-file)
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+src := $(subst /generated,,$(obj))
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+-include $(src)/Kbuild
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+
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+# $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
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+ifneq ($(SRCARCH),um)
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+include $(generic)/Kbuild
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+endif
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 include scripts/Kbuild.include
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-# Create output directory if not already present
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-_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
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+redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
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+redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
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+redundant := $(sort $(redundant))
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+$(if $(redundant),\
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+	$(warning redundant generic-y found in $(src)/Kbuild: $(redundant)))
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-# Stale wrappers when the corresponding files are removed from generic-y
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-# need removing.
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-generated-y   := $(generic-y) $(generated-y)
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-all-files     := $(patsubst %, $(obj)/%, $(generated-y))
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-old-headers   := $(wildcard $(obj)/*.h)
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-unwanted      := $(filter-out $(all-files),$(old-headers))
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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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+
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+generic-y   := $(addprefix $(obj)/, $(generic-y))
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+generated-y := $(addprefix $(obj)/, $(generated-y))
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+
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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>" >$@
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+      cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
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 quiet_cmd_remove = REMOVE  $(unwanted)
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-cmd_remove = rm -f $(unwanted)
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+      cmd_remove = rm -f $(unwanted)
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-all: $(patsubst %, $(obj)/%, $(generic-y)) FORCE
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-	$(if $(unwanted),$(call cmd,remove),)
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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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 	$(call cmd,wrap)
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-PHONY += FORCE
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+# Create output directory. Skip it if at least one old header exists
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+# since we know the output directory already exists.
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+ifeq ($(old-headers),)
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+$(shell mkdir -p $(obj))
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+endif
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+
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 .PHONY: $(PHONY)
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-FORCE: ;