# 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 := allall: src := $(srctree)/$(subst /generated,,$(obj)) include $(srctree)/scripts/Kbuild.include-include $(kbuild-file) # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.ifneq ($(SRCARCH),um)include $(srctree)/$(generic)/Kbuildendif redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))redundant += $(foreach f, $(generic-y), $(if $(wildcard $(src)/$(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 $(src)/$(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-yold-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)