scripts/Makefile.asm-headers

Source file repositories/reference/linux-study-clean/scripts/Makefile.asm-headers

File Facts

System
Linux kernel
Corpus path
scripts/Makefile.asm-headers
Extension
.asm-headers
Size
3459 bytes
Lines
107
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: build/configuration rule
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

# 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 := all
all:

src := $(srctree)/$(subst /generated,,$(obj))

syscall_abis_32  += common,32
syscall_abis_64  += common,64
syscalltbl := $(srctree)/scripts/syscall.tbl
syshdr-args := --emit-nr

# let architectures override $(syscall_abis_%) and $(syscalltbl)
-include $(srctree)/arch/$(SRCARCH)/kernel/Makefile.syscalls
include $(srctree)/scripts/Kbuild.include
-include $(kbuild-file)

syshdr := $(srctree)/scripts/syscallhdr.sh
systbl := $(srctree)/scripts/syscalltbl.sh

# $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
ifneq ($(SRCARCH),um)
include $(srctree)/$(generic)/Kbuild
endif

redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
redundant += $(foreach f, $(generic-y), $(if $(wildcard $(src)/$(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-y
old-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 $(syscall_abis_$*))) \

Annotation

Implementation Notes