name : Makefile.asm-generic # 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 $(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)/Kbuild endif 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)