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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 9
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SUBLEVEL = 0
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EXTRAVERSION = -rc2
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NAME = Kleptomaniac Octopus
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# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

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$(if $(filter __%, $(MAKECMDGOALS)), \
	$(error targets prefixed with '__' are only for internal use))

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# That's our default target when none is given on the command line
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PHONY := __all
__all:
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# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
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# unavoidable when linking the built-in.a targets which finally
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# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

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ifneq ($(sub_make_done),1)
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# Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour)
MAKEFLAGS += -rR

# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC

# Avoid interference with shell env settings
unexport GREP_OPTIONS

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# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
#	$(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
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# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
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#
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# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

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ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
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endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

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ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
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  quiet=silent_
endif

export quiet Q KBUILD_VERBOSE

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# Kbuild will save output files in the current working directory.
# This does not need to match to the root of the kernel source tree.
#
# For example, you can do this:
#
#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
#
# If you want to save output files in a different location, there are
# two syntaxes to specify it.
#
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# 1) O=
# Use "make O=dir/to/store/output/files/"
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#
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# 2) Set KBUILD_OUTPUT
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# Set the environment variable KBUILD_OUTPUT to point to the output directory.
# export KBUILD_OUTPUT=dir/to/store/output/files/; make
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#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

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# Do we want to change the working directory?
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ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
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endif

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ifneq ($(KBUILD_OUTPUT),)
# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
# expand a shell special character '~'. We use a somewhat tedious way here.
abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
$(if $(abs_objtree),, \
     $(error failed to create output directory "$(KBUILD_OUTPUT)"))

# $(realpath ...) resolves symlinks
abs_objtree := $(realpath $(abs_objtree))
else
abs_objtree := $(CURDIR)
endif # ifneq ($(KBUILD_OUTPUT),)

ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." unless we are changing the work directory.
MAKEFLAGS += --no-print-directory
else
need-sub-make := 1
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endif

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abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
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ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
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ifneq ($(abs_srctree),$(abs_objtree))
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# Look for make include files relative to root of kernel src
#
# This does not become effective immediately because MAKEFLAGS is re-parsed
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# once after the Makefile is read. We need to invoke sub-make.
MAKEFLAGS += --include-dir=$(abs_srctree)
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need-sub-make := 1
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endif
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this-makefile := $(lastword $(MAKEFILE_LIST))

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ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
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$(this-makefile): ;
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endif

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export abs_srctree abs_objtree
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export sub_make_done := 1

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ifeq ($(need-sub-make),1)

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PHONY += $(MAKECMDGOALS) __sub-make
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$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
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	@:
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# Invoke a second make in the output directory, passing relevant variables
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__sub-make:
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	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
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endif # need-sub-make
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endif # sub_make_done
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# We process the rest of the Makefile if this is the final invocation of make
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ifeq ($(need-sub-make),)
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# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

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# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
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ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
  KBUILD_CHECKSRC = 0
endif

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# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
# directory of external module to build. Setting M= takes precedence.
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ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

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$(if $(word 2, $(KBUILD_EXTMOD)), \
	$(error building multiple external modules is not supported))

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export KBUILD_CHECKSRC KBUILD_EXTMOD

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extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)

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ifeq ($(abs_srctree),$(abs_objtree))
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        # building in the source tree
        srctree := .
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	building_out_of_srctree :=
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else
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        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
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                # building in a subdirectory of the source tree
                srctree := ..
        else
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                srctree := $(abs_srctree)
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        endif
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	building_out_of_srctree := 1
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endif
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ifneq ($(KBUILD_ABS_SRCTREE),)
srctree := $(abs_srctree)
endif
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objtree		:= .
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VPATH		:= $(srctree)
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export building_out_of_srctree srctree objtree VPATH
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# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

version_h := include/generated/uapi/linux/version.h
old_version_h := include/linux/version.h

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clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
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			 cscope gtags TAGS tags help% %docs check% coccicheck \
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			 $(version_h) headers headers_% archheaders archscripts \
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			 %asm-generic kernelversion %src-pkg dt_binding_check \
			 outputmakefile
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no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
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single-build	:=
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ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
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		need-config :=
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	endif
endif

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ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
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		may-sync-config :=
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	endif
endif

ifneq ($(KBUILD_EXTMOD),)
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	may-sync-config :=
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endif

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ifeq ($(KBUILD_EXTMOD),)
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        ifneq ($(filter %config,$(MAKECMDGOALS)),)
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		config-build := 1
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                ifneq ($(words $(MAKECMDGOALS)),1)
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			mixed-build := 1
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                endif
        endif
endif
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# We cannot build single targets and the others at the same time
ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
	single-build := 1
	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
		mixed-build := 1
	endif
endif

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# For "make -j clean all", "make -j mrproper defconfig all", etc.
ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
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		mixed-build := 1
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        endif
endif

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# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
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		mixed-build := 1
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        endif
endif

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ifdef mixed-build
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# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

PHONY += $(MAKECMDGOALS) __build_one_by_one

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$(MAKECMDGOALS): __build_one_by_one
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	@:

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done

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else # !mixed-build
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include scripts/Kbuild.include

# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION

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include scripts/subarch.include
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# Cross compiling and selecting different set of gcc/bin-utils
# ---------------------------------------------------------------------------
#
# When performing cross compilation for other architectures ARCH shall be set
# to the target architecture. (See arch/* for the possibilities).
# ARCH can be set during invocation of make:
# make ARCH=ia64
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
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ARCH		?= $(SUBARCH)
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# Architecture as present in compile.h
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UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
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# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
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# Additional ARCH settings for sparc
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ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
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ifeq ($(ARCH),sparc64)
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       SRCARCH := sparc
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endif
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# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

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KCONFIG_CONFIG	?= .config
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export KCONFIG_CONFIG
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# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
export KBUILD_DEFCONFIG := defconfig

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# SHELL used by kbuild
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CONFIG_SHELL := sh
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HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
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ifneq ($(LLVM),)
HOSTCC	= clang
HOSTCXX	= clang++
else
HOSTCC	= gcc
HOSTCXX	= g++
endif
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export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
			      -O2 -fomit-frame-pointer -std=gnu89
export KBUILD_USERLDFLAGS :=

KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
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KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
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KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
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# Make variables (CC, etc...)
CPP		= $(CC) -E
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ifneq ($(LLVM),)
CC		= clang
LD		= ld.lld
AR		= llvm-ar
NM		= llvm-nm
OBJCOPY		= llvm-objcopy
OBJDUMP		= llvm-objdump
READELF		= llvm-readelf
OBJSIZE		= llvm-size
STRIP		= llvm-strip
else
CC		= $(CROSS_COMPILE)gcc
LD		= $(CROSS_COMPILE)ld
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AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
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READELF		= $(CROSS_COMPILE)readelf
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OBJSIZE		= $(CROSS_COMPILE)size
STRIP		= $(CROSS_COMPILE)strip
endif
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PAHOLE		= pahole
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RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
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LEX		= flex
YACC		= bison
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AWK		= awk
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INSTALLKERNEL  := installkernel
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DEPMOD		= /sbin/depmod
PERL		= perl
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PYTHON		= python
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PYTHON3		= python3
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CHECK		= sparse
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BASH		= bash
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KGZIP		= gzip
KBZIP2		= bzip2
KLZOP		= lzop
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LZMA		= lzma
LZ4		= lz4c
XZ		= xz
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ZSTD		= zstd
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CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
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		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
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NOSTDINC_FLAGS :=
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CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
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CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
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LDFLAGS_vmlinux =
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# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
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		-I$(srctree)/include/uapi \
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		-I$(objtree)/include/generated/uapi \
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                -include $(srctree)/include/linux/kconfig.h

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# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
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LINUXINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
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		$(if $(building_out_of_srctree),-I$(srctree)/include) \
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		-I$(objtree)/include \
		$(USERINCLUDE)
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KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
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KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
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		   -Werror=implicit-function-declaration -Werror=implicit-int \
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		   -Wno-format-security \
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		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
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KBUILD_LDFLAGS_MODULE :=
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KBUILD_LDFLAGS :=
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CLANG_FLAGS :=
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export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
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export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
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export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
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export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
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export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
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export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
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export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
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export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
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export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
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# Files to ignore in find ... statements

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export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
			  -prune -o
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export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
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# ===========================================================================
# Rules shared between *config targets and build targets

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# Basic helpers built in scripts/basic/
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PHONY += scripts_basic
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scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
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	$(Q)rm -f .tmp_quiet_recordmcount
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PHONY += outputmakefile
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# Before starting out-of-tree build, make sure the source tree is clean.
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# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
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# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
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outputmakefile:
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ifdef building_out_of_srctree
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	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
		echo >&2 "***"; \
		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
		echo >&2 "*** in $(abs_srctree)";\
		echo >&2 "***"; \
		false; \
	fi
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	$(Q)ln -fsn $(srctree) source
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	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
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	$(Q)test -e .gitignore || \
	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
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endif
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ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
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ifneq ($(CROSS_COMPILE),)
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CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
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GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
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CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
569
GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
570 571
endif
ifneq ($(GCC_TOOLCHAIN),)
572
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
573
endif
574
ifneq ($(LLVM_IAS),1)
575
CLANG_FLAGS	+= -no-integrated-as
576
endif
577
CLANG_FLAGS	+= -Werror=unknown-warning-option
578 579
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
580
export CLANG_FLAGS
581 582
endif

583 584 585 586
# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
587
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
588

589
ifdef config-build
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# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
597
include arch/$(SRCARCH)/Makefile
598
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
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600
config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

603
%config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

606
else #!config-build
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# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

611
# If building an external module we do not care about the all: rule
612
# but instead __all depend on modules
613 614
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
615
__all: all
616
else
617
__all: modules
618 619 620 621 622 623 624 625 626 627
endif

# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

# If we have only "make modules", don't compile built-in objects.
ifeq ($(MAKECMDGOALS),modules)
628
  KBUILD_BUILTIN :=
629 630 631 632 633 634
endif

# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well

635
ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
636 637 638 639 640 641 642 643 644
  KBUILD_MODULES := 1
endif

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
endif

export KBUILD_MODULES KBUILD_BUILTIN

645
ifdef need-config
646 647 648
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
651
core-y		:= init/ usr/
652
drivers-y	:= drivers/ sound/
653
drivers-$(CONFIG_SAMPLES) += samples/
654
drivers-y	+= net/ virt/
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655 656 657
libs-y		:= lib/
endif # KBUILD_EXTMOD

658 659 660 661 662 663 664 665 666
# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
# Defaults to vmlinux, but the arch makefile usually adds further targets
all: vmlinux

CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
	$(call cc-option,-fno-tree-loop-im) \
	$(call cc-disable-warning,maybe-uninitialized,)
667
export CFLAGS_GCOV
668

669 670 671 672 673
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

674 675 676 677 678 679 680 681 682
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
export RETPOLINE_CFLAGS
export RETPOLINE_VDSO_CFLAGS

683
include arch/$(SRCARCH)/Makefile
L
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685 686
ifdef need-config
ifdef may-sync-config
687 688 689
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
690
include include/config/auto.conf.cmd
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692 693 694 695 696 697 698 699
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" not found!'
	@echo >&2 '***'
	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
	@echo >&2 '*** "make menuconfig" or "make xconfig").'
	@echo >&2 '***'
	@/bin/false
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701 702 703
# The actual configuration files used during the build are stored in
# include/generated/ and include/config/. Update them if .config is newer than
# include/config/auto.conf (which mirrors .config).
704 705 706
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
707
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
708 709 710
quiet_cmd_syncconfig = SYNC    $@
      cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig

711
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
712
	+$(call cmd,syncconfig)
713
else # !may-sync-config
714 715 716
# External modules and some install targets need include/generated/autoconf.h
# and include/config/auto.conf but do not care if they are up-to-date.
# Use auto.conf to trigger the test
717 718 719
PHONY += include/config/auto.conf

include/config/auto.conf:
720
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
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	echo >&2;							\
	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo >&2 ;							\
726 727
	/bin/false)

728
endif # may-sync-config
729
endif # need-config
L
Linus Torvalds 已提交
730

731
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
732
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
733 734
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
735
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
736

737 738 739 740 741 742
ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
KBUILD_CFLAGS += -O2
else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
KBUILD_CFLAGS += -O3
else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
743
endif
L
Linus Torvalds 已提交
744

745 746
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
747
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
748

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Andi Kleen 已提交
749 750 751 752 753 754 755 756 757 758
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                 $(call cc-option,-fno-ipa-cp-clone,) \
                 $(call cc-option,-fno-partial-inlining)
endif

759
ifneq ($(CONFIG_FRAME_WARN),0)
760
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
761 762
endif

763
stackp-flags-y                                    := -fno-stack-protector
764 765
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
766 767

KBUILD_CFLAGS += $(stackp-flags-y)
768

769
ifdef CONFIG_CC_IS_CLANG
770 771 772
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
773 774 775
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
776
KBUILD_CFLAGS += -mno-global-merge
777 778 779 780
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
781
KBUILD_CFLAGS += -Wno-unused-but-set-variable
782 783 784 785 786

# Warn about unmarked fall-throughs in switch statement.
# Disabled for clang while comment to attribute conversion happens and
# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
787 788
endif

789
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
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790
ifdef CONFIG_FRAME_POINTER
791
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
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792
else
793 794 795 796 797 798
# Some targets (ARM with Thumb2, for example), can't be built with frame
# pointers.  For those, we don't have FUNCTION_TRACER automatically
# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
# -fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER
799
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
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800
endif
801
endif
L
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802

803 804
# Initialize all stack variables with a 0xAA pattern.
ifdef CONFIG_INIT_STACK_ALL_PATTERN
805 806 807
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

808 809 810 811 812 813 814 815 816
# Initialize all stack variables with a zero value.
ifdef CONFIG_INIT_STACK_ALL_ZERO
# Future support for zero initialization is still being debated, see
# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
# renamed or dropped.
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
KBUILD_CFLAGS	+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
endif

817
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
818

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819
ifdef CONFIG_DEBUG_INFO
820

A
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821
ifdef CONFIG_DEBUG_INFO_SPLIT
822
DEBUG_CFLAGS	+= -gsplit-dwarf
A
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823
else
824
DEBUG_CFLAGS	+= -g
A
Andi Kleen 已提交
825
endif
826

827
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
828

829
ifdef CONFIG_DEBUG_INFO_DWARF4
830
DEBUG_CFLAGS	+= -gdwarf-4
831
endif
L
Linus Torvalds 已提交
832

833
ifdef CONFIG_DEBUG_INFO_REDUCED
834
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
835
		   $(call cc-option,-fno-var-tracking)
836 837
endif

838 839
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
840
KBUILD_AFLAGS	+= -gz=zlib
841 842 843
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

844 845
endif # CONFIG_DEBUG_INFO

846 847 848
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

849
ifdef CONFIG_FUNCTION_TRACER
850 851 852 853 854 855
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
856 857 858 859 860 861
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
862
endif
863
ifdef CONFIG_HAVE_FENTRY
864 865 866 867
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
868
endif
869 870 871
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
872
ifdef CONFIG_DYNAMIC_FTRACE
873
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
874 875 876 877
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
878 879
endif

880 881 882 883 884
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

885
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
886 887
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
888 889
endif

890 891 892 893
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

894 895 896 897 898 899
ifdef CONFIG_SHADOW_CALL_STACK
CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
export CC_FLAGS_SCS
endif

900 901 902 903
ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
KBUILD_CFLAGS += -falign-functions=32
endif

904
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
905
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
906

L
Linus Torvalds 已提交
907
# warn about C99 declaration after statement
908
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
909

K
Kees Cook 已提交
910
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
911
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
912

S
Sam Ravnborg 已提交
913
# disable pointer signed / unsigned warnings in gcc 4.0
914
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
915

916 917 918
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

919 920
# We'll want to enable this eventually, but it's not going away for 5.7 at least
KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
921
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
922
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
923

924 925 926
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

927 928 929
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

930
# disable invalid "can't wrap" optimizations for signed / pointers
931
KBUILD_CFLAGS	+= -fno-strict-overflow
932

933 934 935 936 937 938 939 940 941
# clang sets -fmerge-all-constants by default as optimization, but this
# is non-conforming behavior for C and in fact breaks the kernel, so we
# need to disable it here generally.
KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)

# for gcc -fno-merge-all-constants disables everything, but it is fine
# to have actual conforming behavior enabled.
KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)

942
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
943
KBUILD_CFLAGS  += -fno-stack-check
944

945 946 947
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

948
# Prohibit date/time macros, which would make the build non-deterministic
949
KBUILD_CFLAGS   += -Werror=date-time
950

951 952 953
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

954 955 956
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

957 958 959
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

960 961 962 963 964 965
# ensure -fcf-protection is disabled when using retpoline as it is
# incompatible with -mindirect-branch=thunk-extern
ifdef CONFIG_RETPOLINE
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif

966 967 968 969 970 971 972 973 974
# include additional Makefiles when needed
include-y			:= scripts/Makefile.extrawarn
include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
include-$(CONFIG_UBSAN)		+= scripts/Makefile.ubsan
include-$(CONFIG_KCOV)		+= scripts/Makefile.kcov
include-$(CONFIG_GCC_PLUGINS)	+= scripts/Makefile.gcc-plugins

include $(addprefix $(srctree)/, $(include-y))
975

976 977 978
# scripts/Makefile.gcc-plugins is intentionally included last.
# Do not add $(call cc-option,...) below this line. When you build the kernel
# from the clean source tree, the GCC plugins do not exist at this point.
979

980 981 982 983
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
984

985 986
KBUILD_LDFLAGS_MODULE += --build-id=sha1
LDFLAGS_vmlinux += --build-id=sha1
R
Roland McGrath 已提交
987

988
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
989
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
990 991
endif

992 993 994 995
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
endif

996
# Align the bit size of userspace programs with the kernel
997 998
KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
999

1000 1001 1002
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

1003 1004 1005
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

1006 1007 1008
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
1009
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
1010
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= vmlinux

#
# INSTALL_PATH specifies where to place the updated kernel and system map
# images. Default is /boot, but you can set it to other values
export	INSTALL_PATH ?= /boot

1021 1022 1023 1024 1025 1026 1027
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)

L
Linus Torvalds 已提交
1028 1029 1030
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
S
Sam Ravnborg 已提交
1031
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
1032 1033
#

1034
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
1035 1036
export MODLIB

1037
#
1038 1039 1040 1041
# INSTALL_MOD_STRIP, if defined, will cause modules to be
# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
# the default option --strip-debug will be used.  Otherwise,
# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1042

1043 1044
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
1045
mod_strip_cmd = $(STRIP) --strip-debug
1046
else
1047
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1048 1049
endif # INSTALL_MOD_STRIP=1
else
1050
mod_strip_cmd = true
1051 1052 1053
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1054 1055 1056 1057 1058 1059 1060
# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
# or CONFIG_MODULE_COMPRESS_XZ.

mod_compress_cmd = true
ifdef CONFIG_MODULE_COMPRESS
  ifdef CONFIG_MODULE_COMPRESS_GZIP
1061
    mod_compress_cmd = $(KGZIP) -n -f
1062 1063
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1064
    mod_compress_cmd = $(XZ) -f
1065 1066 1067 1068
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1069
ifdef CONFIG_MODULE_SIG_ALL
1070 1071 1072
$(eval $(call config_filename,MODULE_SIG_KEY))

mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1073 1074 1075 1076 1077
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1078 1079
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1080 1081 1082
has_libelf = $(call try-run,\
               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)

1083 1084 1085 1086 1087 1088 1089 1090 1091
ifdef CONFIG_STACK_VALIDATION
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1092 1093 1094 1095 1096 1097 1098 1099
ifdef CONFIG_DEBUG_INFO_BTF
  ifeq ($(has_libelf),1)
    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
  else
    ERROR_RESOLVE_BTFIDS := 1
  endif
endif

1100
PHONY += prepare0
1101

1102
export MODORDER := $(extmod-prefix)modules.order
1103
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1104

L
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1105
ifeq ($(KBUILD_EXTMOD),)
1106
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1107

1108
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
Linus Torvalds 已提交
1109
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1110
		     $(libs-y) $(libs-m)))
L
Linus Torvalds 已提交
1111

1112
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1113
		     $(patsubst %/,%,$(filter %/, $(core-) \
1114
			$(drivers-) $(libs-))))
L
Linus Torvalds 已提交
1115

1116 1117 1118
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))
L
Linus Torvalds 已提交
1119

1120
build-dirs	:= $(vmlinux-dirs)
1121
clean-dirs	:= $(vmlinux-alldirs)
1122

1123 1124 1125
# Externally visible symbols (used by link-vmlinux.sh)
KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1126
ifdef CONFIG_MODULES
1127 1128
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1129
else
1130
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1131
endif
1132
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1133

1134
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1135
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1136
# used by scripts/Makefile.package
1137
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1138

1139
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1140

1141 1142
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1143
ifdef CONFIG_TRIM_UNUSED_KSYMS
1144 1145 1146
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
1147 1148 1149 1150 1151
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1152 1153
endif

1154 1155
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1156 1157 1158 1159
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1160
$(autoksyms_h):
1161
	$(call cmd,autoksyms_h)
1162

1163 1164 1165
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1166
cmd_link-vmlinux =                                                 \
1167
	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1168
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1169

1170
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1171
	+$(call if_changed,link-vmlinux)
1172

1173 1174
targets := vmlinux

1175
# The actual objects are generated when descending,
L
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1176
# make sure no implicit rule kicks in
1177
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
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1178

1179
filechk_kernel.release = \
1180 1181
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1182
# Store (new) KERNELRELEASE string in include/config/kernel.release
1183
include/config/kernel.release: FORCE
1184
	$(call filechk,kernel.release)
1185

1186 1187 1188 1189
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1190
scripts: scripts_basic scripts_dtc
1191
	$(Q)$(MAKE) $(build)=$(@)
1192

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1193
# Things we need to do before we recursively start building the kernel
1194 1195 1196 1197
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
L
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1198

M
Masahiro Yamada 已提交
1199
PHONY += prepare archprepare
1200

1201
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1202 1203
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1204

1205
prepare0: archprepare
1206
	$(Q)$(MAKE) $(build)=scripts/mod
1207
	$(Q)$(MAKE) $(build)=.
1208

L
Linus Torvalds 已提交
1209
# All the preparing..
1210
prepare: prepare0 prepare-objtool prepare-resolve_btfids
1211

1212
# Support for using generic headers in asm-generic
1213 1214
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1215 1216
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1217 1218
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1219
uapi-asm-generic:
1220 1221
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1222

1223
PHONY += prepare-objtool prepare-resolve_btfids
1224
prepare-objtool: $(objtool_target)
1225 1226 1227 1228 1229 1230 1231 1232
ifeq ($(SKIP_STACK_VALIDATION),1)
ifdef CONFIG_UNWINDER_ORC
	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
	@false
else
	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
endif
endif
L
Linus Torvalds 已提交
1233

1234 1235 1236 1237 1238
prepare-resolve_btfids: $(resolve_btfids_target)
ifeq ($(ERROR_RESOLVE_BTFIDS),1)
	@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
	@false
endif
L
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1239 1240 1241 1242 1243 1244 1245
# Generate some files
# ---------------------------------------------------------------------------

# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds

uts_len := 64
S
Sam Ravnborg 已提交
1246 1247 1248 1249 1250
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1251
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1252
endef
L
Linus Torvalds 已提交
1253 1254

define filechk_version.h
1255
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1256
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1257
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
Linus Torvalds 已提交
1258 1259
endef

1260
$(version_h): FORCE
L
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1261
	$(call filechk,version.h)
1262
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1263

1264
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1265 1266
	$(call filechk,utsrelease.h)

1267 1268
PHONY += headerdep
headerdep:
1269 1270
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1271

1272 1273 1274
# ---------------------------------------------------------------------------
# Kernel headers

1275 1276
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1277

1278 1279 1280 1281 1282
quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
      cmd_headers_install = \
	mkdir -p $(INSTALL_HDR_PATH); \
	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
	usr/include $(INSTALL_HDR_PATH)
1283

1284
PHONY += headers_install
1285 1286
headers_install: headers
	$(call cmd,headers_install)
1287

1288
PHONY += archheaders archscripts
1289

1290
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1291

1292 1293
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1294
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1295
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1296 1297
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1298

1299
# Deprecated. It is no-op now.
1300
PHONY += headers_check
1301 1302
headers_check:
	@:
1303

1304
ifdef CONFIG_HEADERS_INSTALL
1305
prepare: headers
1306
endif
1307

1308 1309 1310 1311
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1312 1313 1314 1315 1316
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1317
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1318

1319 1320
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1321

1322 1323 1324
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1325 1326
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1327
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1328

1329 1330 1331 1332 1333 1334 1335 1336 1337
# ---------------------------------------------------------------------------
# Devicetree files

ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
dtstree := arch/$(SRCARCH)/boot/dts
endif

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1338
%.dtb: include/config/kernel.release scripts_dtc
1339 1340
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1341
PHONY += dtbs dtbs_install dtbs_check
1342
dtbs: include/config/kernel.release scripts_dtc
1343 1344
	$(Q)$(MAKE) $(build)=$(dtstree)

1345
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1346
export CHECK_DTBS=y
1347 1348 1349 1350
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1351

1352
dtbs_install:
1353
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

PHONY += scripts_dtc
scripts_dtc: scripts_basic
	$(Q)$(MAKE) $(build)=scripts/dtc

1365 1366 1367 1368
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1369
PHONY += dt_binding_check
1370 1371 1372
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
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1373 1374 1375 1376 1377
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1378
# By default, build modules as well
L
Linus Torvalds 已提交
1379

1380
all: modules
L
Linus Torvalds 已提交
1381

1382 1383 1384 1385 1386 1387 1388
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.
ifdef CONFIG_MODVERSIONS
  KBUILD_BUILTIN := 1
endif

1389
# Build modules
T
Tejun Heo 已提交
1390
#
1391 1392 1393
# A module can be listed more than once in obj-m resulting in
# duplicate lines in modules.order files.  Those are removed
# using awk while concatenating to the final file.
L
Linus Torvalds 已提交
1394

1395
PHONY += modules
1396
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
S
Sam Ravnborg 已提交
1397
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1398

1399 1400 1401
PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1402

1403 1404 1405 1406 1407 1408
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

modules.order: $(subdir-modorder) FORCE
	$(call if_changed,modules_order)

targets += modules.order
1409

L
Linus Torvalds 已提交
1410
# Target to prepare building external modules
1411
PHONY += modules_prepare
1412
modules_prepare: prepare
1413
	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
L
Linus Torvalds 已提交
1414 1415

# Target to install modules
1416
PHONY += modules_install
L
Linus Torvalds 已提交
1417 1418
modules_install: _modinst_ _modinst_post

1419
PHONY += _modinst_
1420
_modinst_:
L
Linus Torvalds 已提交
1421 1422 1423
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1424
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1425 1426
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1427
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1428
	fi
1429
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1430 1431
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1432
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1433

1434
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1435 1436
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1437
PHONY += _modinst_post
1438
_modinst_post: _modinst_
1439
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1440

J
Josh Boyer 已提交
1441 1442 1443 1444 1445 1446
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1447 1448 1449 1450 1451
else # CONFIG_MODULES

# Modules not configured
# ---------------------------------------------------------------------------

1452 1453
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1454 1455 1456 1457 1458
	@echo >&2
	@echo >&2 "The present kernel configuration has modules disabled."
	@echo >&2 "Type 'make config' and enable loadable module support."
	@echo >&2 "Then build a kernel with module support enabled."
	@echo >&2
L
Linus Torvalds 已提交
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
	@exit 1

endif # CONFIG_MODULES

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules
# make mrproper  Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
1471
CLEAN_FILES += include/ksym vmlinux.symvers \
1472 1473
	       modules.builtin modules.builtin.modinfo modules.nsdeps \
	       compile_commands.json
L
Linus Torvalds 已提交
1474 1475

# Directories & files removed with 'make mrproper'
1476
MRPROPER_FILES += include/config include/generated          \
1477
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1478 1479
		  debian snap tar-install \
		  .config .config.old .version \
1480
		  Module.symvers \
1481 1482
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1483 1484
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1485

1486 1487 1488
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1489 1490 1491 1492
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1493
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1494

1495 1496
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1497
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1498 1499

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1500 1501 1502 1503

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1504
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1505

1506
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1507 1508 1509
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1510
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1511 1512 1513 1514
	$(call cmd,rmfiles)

# distclean
#
1515 1516
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1517
PHONY += distclean
L
Linus Torvalds 已提交
1518 1519

distclean: mrproper
1520
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1521
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1522
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1523 1524
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1525 1526 1527 1528 1529 1530
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------

1531
%src-pkg: FORCE
1532
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1533
%pkg: include/config/kernel.release FORCE
1534
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1535 1536 1537 1538

# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------

1539
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1540
boards := $(sort $(notdir $(boards)))
1541 1542
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1543

1544
PHONY += help
L
Linus Torvalds 已提交
1545 1546
help:
	@echo  'Cleaning targets:'
1547
	@echo  '  clean		  - Remove most generated files but keep the config and'
1548
	@echo  '                    enough build support to build external modules'
1549
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1550
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1551 1552 1553 1554 1555 1556 1557 1558
	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all targets marked with [*]'
	@echo  '* vmlinux	  - Build the bare kernel'
	@echo  '* modules	  - Build all modules'
1559
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1560
	@echo  '  dir/            - Build all files in dir and below'
1561
	@echo  '  dir/file.[ois]  - Build specified target only'
1562 1563
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1564 1565
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1566
	@echo  '  dir/file.ko     - Build module including final link'
1567
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1568 1569
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1570
	@echo  '  gtags           - Generate GNU GLOBAL index'
1571 1572 1573
	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
	@echo  '  image_name	  - Output the image name (use with make -s)'
1574
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1575
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1576
	 echo  ''
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	@echo  'Static analysers:'
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1578
	@echo  '  checkstack      - Generate a list of stack hogs'
1579
	@echo  '  versioncheck    - Sanity check on version.h usage'
1580
	@echo  '  includecheck    - Check for duplicate included header files'
1581
	@echo  '  export_report   - List the usages of all exported symbols'
1582
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1583
	@echo  '  coccicheck      - Check with Coccinelle'
1584 1585
	@echo  '  clang-analyzer  - Check with clang static analyzer'
	@echo  '  clang-tidy      - Check with clang-tidy'
1586
	@echo  ''
1587 1588 1589
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
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1590
	@echo  'Kernel selftest:'
1591 1592 1593 1594 1595 1596 1597 1598 1599
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1600
	@echo  ''
1601 1602
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1603 1604 1605 1606
		echo '* dtbs             - Build device tree blobs for enabled boards'; \
		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
		echo '  dt_binding_check - Validate device tree binding documents'; \
		echo '  dtbs_check       - Validate device tree source files';\
1607 1608
		echo '')

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1609 1610 1611 1612
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1613
	@echo  'Kernel packaging:'
1614
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
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1615 1616
	@echo  ''
	@echo  'Documentation targets:'
1617
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1618
	@echo  ''
1619
	@echo  'Architecture specific targets ($(SRCARCH)):'
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1620
	@$(if $(archhelp),$(archhelp),\
1621
		echo '  No architecture specific help defined for $(SRCARCH)')
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1622 1623 1624
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1625
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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1626
		echo '')
1627 1628 1629 1630 1631
	@$(if $(board-dirs), \
		$(foreach b, $(board-dirs), \
		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
		printf "  %-16s - Show all of the above\\n" help-boards; \
		echo '')
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1632 1633

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1634
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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1635
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1636 1637
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1638
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1639
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1640
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1641 1642 1643
	@echo  '		1: warnings which may be relevant and do not occur too often'
	@echo  '		2: warnings which occur quite often but may still be relevant'
	@echo  '		3: more obscure warnings, can most likely be ignored'
1644
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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1645 1646 1647 1648 1649
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1650 1651 1652 1653
help-board-dirs := $(addprefix help-,$(board-dirs))

help-boards: $(help-board-dirs)

1654
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1655 1656 1657 1658 1659 1660 1661 1662 1663

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(SRCARCH) $*):'
	@$(if $(boards-per-dir), \
		$(foreach b, $(boards-per-dir), \
		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
		echo '')


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1664 1665
# Documentation targets
# ---------------------------------------------------------------------------
1666 1667
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1668
PHONY += $(DOC_TARGETS)
1669
$(DOC_TARGETS):
1670
	$(Q)$(MAKE) $(build)=Documentation $@
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1671

1672 1673 1674 1675
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1676
scripts_gdb: prepare0
1677
	$(Q)$(MAKE) $(build)=scripts/gdb
1678
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1679 1680 1681 1682 1683

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
else # KBUILD_EXTMOD

###
# External module support.
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
# in the basis kernel ordinary make commands (without M=...) must
# be used.
#
# The following are the only valid targets when building external
# modules.
# make M=dir clean     Delete all automatically generated files
# make M=dir modules   Make all modules in specified dir
# make M=dir	       Same as 'make M=dir modules'
# make M=dir modules_install
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1700
#                      Install the modules built in the module directory
L
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1701 1702
#                      Assumes install directory is already created

1703 1704
# We are always building only modules.
KBUILD_BUILTIN :=
L
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1705 1706
KBUILD_MODULES := 1

1707 1708
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1709
modules: $(MODORDER)
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1710
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
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1711

1712 1713 1714
$(MODORDER): descend
	@:

1715
PHONY += modules_install
1716
modules_install: _emodinst_ _emodinst_post
1717

1718 1719
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1720 1721
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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1722
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1723

1724
PHONY += _emodinst_post
1725 1726 1727
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1728 1729 1730
compile_commands.json: $(extmod-prefix)compile_commands.json
PHONY += compile_commands.json

1731
clean-dirs := $(KBUILD_EXTMOD)
1732 1733
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
	$(KBUILD_EXTMOD)/compile_commands.json
L
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1734

1735
PHONY += help
L
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1736 1737 1738 1739 1740 1741 1742 1743
help:
	@echo  '  Building external modules.'
	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
	@echo  ''
	@echo  '  modules         - default target, build the module(s)'
	@echo  '  modules_install - install the module'
	@echo  '  clean           - remove generated files in module directory only'
	@echo  ''
1744

1745 1746 1747
# no-op for external module builds
PHONY += prepare modules_prepare

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1748 1749
endif # KBUILD_EXTMOD

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
# Single targets
# ---------------------------------------------------------------------------
# To build individual files in subdirectories, you can do like this:
#
#   make foo/bar/baz.s
#
# The supported suffixes for single-target are listed in 'single-targets'
#
# To build only under specific subdirectories, you can do like this:
#
#   make foo/bar/baz/

ifdef single-build

# .ko is special because modpost is needed
single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))

$(single-ko): single_modpost
	@:
$(single-no-ko): descend
	@:

ifeq ($(KBUILD_EXTMOD),)
# For the single build of in-tree modules, use a temporary file to avoid
# the situation of modules_install installing an invalid modules.order.
MODORDER := .modules.tmp
endif

PHONY += single_modpost
1780
single_modpost: $(single-no-ko) modules_prepare
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

KBUILD_MODULES := 1

export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))

# trim unrelated directories
build-dirs := $(foreach d, $(build-dirs), \
			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))

endif

1794 1795 1796 1797
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1798 1799 1800 1801 1802 1803 1804 1805
# Handle descending into subdirectories listed in $(build-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language
PHONY += descend $(build-dirs)
descend: $(build-dirs)
$(build-dirs): prepare
1806
	$(Q)$(MAKE) $(build)=$@ \
1807
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1808
	need-builtin=1 need-modorder=1
1809

1810 1811 1812 1813 1814
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1815 1816
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1817
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1818
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1819 1820
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1821
		-o -name '*.dwo' -o -name '*.lst' \
1822
		-o -name '*.su' -o -name '*.mod' \
1823
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1824
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1825
		-o -name '*.asn1.[ch]' \
1826
		-o -name '*.symtypes' -o -name 'modules.order' \
1827
		-o -name '.tmp_*.o.*' \
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Emese Revfy 已提交
1828
		-o -name '*.c.[012]*.*' \
1829
		-o -name '*.ll' \
1830 1831
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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1832 1833
# Generate tags for editors
# ---------------------------------------------------------------------------
1834
quiet_cmd_tags = GEN     $@
1835
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
L
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1836

1837
tags TAGS cscope gtags: FORCE
L
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1838 1839
	$(call cmd,tags)

1840 1841 1842 1843
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1844
nsdeps: export KBUILD_NSDEPS=1
1845
nsdeps: modules
1846
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1847

1848 1849 1850 1851 1852 1853
# Clang Tooling
# ---------------------------------------------------------------------------

quiet_cmd_gen_compile_commands = GEN     $@
      cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))

1854
$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1855 1856 1857 1858 1859 1860
	$(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
	$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
	$(call if_changed,gen_compile_commands)

targets += $(extmod-prefix)compile_commands.json

1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
PHONY += clang-tidy clang-analyzer

ifdef CONFIG_CC_IS_CLANG
quiet_cmd_clang_tools = CHECK   $<
      cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<

clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
	$(call cmd,clang_tools)
else
clang-tidy clang-analyzer:
	@echo "$@ requires CC=clang" >&2
	@false
endif

L
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1875 1876 1877
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

J
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1878
PHONY += includecheck versioncheck coccicheck export_report
P
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1879

L
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1880
includecheck:
1881
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1882
		-name '*.[hcS]' -type f -print | sort \
1883
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
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1884 1885

versioncheck:
1886
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1887
		-name '*.[hcS]' -type f -print | sort \
1888
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
Linus Torvalds 已提交
1889

1890
coccicheck:
1891
	$(Q)$(BASH) $(srctree)/scripts/$@
1892

1893 1894 1895
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1896
PHONY += checkstack kernelrelease kernelversion image_name
J
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1897

J
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1898 1899 1900 1901 1902 1903 1904 1905 1906
# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
L
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1907 1908
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1909
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
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1910

1911 1912
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1913

1914
kernelversion:
1915
	@echo $(KERNELVERSION)
L
Linus Torvalds 已提交
1916

1917 1918 1919
image_name:
	@echo $(KBUILD_IMAGE)

1920
# Clear a bunch of variables before executing the submake
1921 1922 1923 1924 1925

ifeq ($(quiet),silent_)
tools_silent=s
endif

1926
tools/: FORCE
1927
	$(Q)mkdir -p $(objtree)/tools
1928
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1929 1930

tools/%: FORCE
1931
	$(Q)mkdir -p $(objtree)/tools
1932
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1933

L
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1934
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1935
      cmd_rmfiles = rm -rf $(rm-files)
L
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1936

1937
# Run depmod only if we have System.map and depmod is executable
1938
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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Michal Marek 已提交
1939
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1940
                   $(KERNELRELEASE)
1941

1942 1943
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
L
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1944

1945
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1946

1947
endif # config-build
1948 1949
endif # mixed-build
endif # need-sub-make
L
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1950

1951
PHONY += FORCE
L
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1952
FORCE:
1953

1954
# Declare the contents of the PHONY variable as phony.  We keep that
1955
# information in a variable so we can use it in if_changed and friends.
1956
.PHONY: $(PHONY)