1 # SPDX-License-Identifier: GPL-2.0
2 # include/asm-generic contains a lot of files that are used
3 # verbatim by several architectures.
5 # This Makefile reads the file arch/$(SRCARCH)/include/(uapi/)/asm/Kbuild
6 # and for each file listed in this file with generic-y creates
7 # a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
12 src := $(subst /generated,,$(obj))
14 include $(srctree)/scripts/Kbuild.include
15 -include $(kbuild-file)
17 # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
19 include $(srctree)/$(generic)/Kbuild
22 redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
23 redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
24 redundant := $(sort $(redundant))
26 $(warning redundant generic-y found in $(src)/Kbuild: $(redundant)))
28 # If arch does not implement mandatory headers, fallback to asm-generic ones.
29 mandatory-y := $(filter-out $(generated-y), $(mandatory-y))
30 generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(srctree)/$(src)/$(f)),,$(f)))
32 generic-y := $(addprefix $(obj)/, $(generic-y))
33 generated-y := $(addprefix $(obj)/, $(generated-y))
35 # Remove stale wrappers when the corresponding files are removed from generic-y
36 old-headers := $(wildcard $(obj)/*.h)
37 unwanted := $(filter-out $(generic-y) $(generated-y),$(old-headers))
39 quiet_cmd_wrap = WRAP $@
40 cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
42 quiet_cmd_remove = REMOVE $(unwanted)
43 cmd_remove = rm -f $(unwanted)
46 $(if $(unwanted),$(call cmd,remove))
52 # Create output directory. Skip it if at least one old header exists
53 # since we know the output directory already exists.
54 ifeq ($(old-headers),)
55 $(shell mkdir -p $(obj))