# SPDX-License-Identifier: GPL-2.0# include/asm-generic contains a lot of files that are used# verbatim by several architectures.## This Makefile generates arch/$(SRCARCH)/include/generated/(uapi/)/asm# headers from multiple sources:#  - a small wrapper to include the corresponding asm-generic/*.h#    is generated for each file listed as generic-y#  - uapi/asm/unistd_*.h files listed as syscalls-y are generated from#    syscall.tbl with the __NR_* macros#  - Corresponding asm/syscall_table_*.h are generated from the same input PHONY := allall: src := $(srctree)/$(subst /generated,,$(obj)) syscall_abis_32  += common,32syscall_abis_64  += common,64syscalltbl := $(srctree)/scripts/syscall.tblsyshdr-args := --emit-nr # let architectures override $(syscall_abis_%) and $(syscalltbl)-include $(srctree)/arch/$(SRCARCH)/kernel/Makefile.syscallsinclude $(srctree)/scripts/Kbuild.include-include $(kbuild-file) syshdr := $(srctree)/scripts/syscallhdr.shsystbl := $(srctree)/scripts/syscalltbl.sh # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.ifneq ($(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))syscall-y   := $(addprefix $(obj)/, $(syscall-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) $(syscall-y),$(old-headers)) quiet_cmd_wrap = WRAP    $@      cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@ quiet_cmd_remove = REMOVE  $(unwanted)      cmd_remove = rm -f $(unwanted) quiet_cmd_syshdr = SYSHDR  $@      cmd_syshdr = $(CONFIG_SHELL) $(syshdr) \		   $(if $(syshdr-args-$*),$(syshdr-args-$*),$(syshdr-args)) \		   $(if $(syscall_compat),--prefix "compat$*_") \		   --abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \		   $< $@ quiet_cmd_systbl = SYSTBL  $@      cmd_systbl = $(CONFIG_SHELL) $(systbl) \		   $(if $(systbl-args-$*),$(systbl-args-$*),$(systbl-args)) \		   --abis $(subst $(space),$(comma),$(strip $(syscall_abis_$*))) \		   $< $@ all: $(generic-y) $(syscall-y)	$(if $(unwanted),$(call cmd,remove))	@: $(obj)/%.h: $(srctree)/$(generic)/%.h	$(call cmd,wrap) $(obj)/unistd_%.h: $(syscalltbl) $(syshdr) FORCE	$(call if_changed,syshdr) $(obj)/unistd_compat_%.h: syscall_compat:=1$(obj)/unistd_compat_%.h: $(syscalltbl) $(syshdr) FORCE	$(call if_changed,syshdr) $(obj)/syscall_table_%.h: $(syscalltbl) $(systbl) FORCE	$(call if_changed,systbl) targets := $(syscall-y) # Create output directory. Skip it if at least one old header exists# since we know the output directory already exists.ifeq ($(old-headers),)$(shell mkdir -p $(obj))endif PHONY += FORCE FORCE: existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) .PHONY: $(PHONY)