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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 10
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SUBLEVEL = 0
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EXTRAVERSION =
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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 := $(no-dot-config-targets) %install kernelrelease \
			  image_name
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
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single-build	:=
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ifneq ($(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
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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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		= depmod
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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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		   -Werror=return-type -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 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))
568
GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
569 570
endif
ifneq ($(GCC_TOOLCHAIN),)
571
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
572
endif
573
ifneq ($(LLVM_IAS),1)
574
CLANG_FLAGS	+= -no-integrated-as
575
endif
576
CLANG_FLAGS	+= -Werror=unknown-warning-option
577 578
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
579
export CLANG_FLAGS
580 581
endif

582 583 584 585
# 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.
586
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
587

588
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'
596
include arch/$(SRCARCH)/Makefile
597
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
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598

599
config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

602
%config: outputmakefile scripts_basic FORCE
L
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603 604
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

605
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.

610
# If building an external module we do not care about the all: rule
611
# but instead __all depend on modules
612 613
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
614
__all: all
615
else
616
__all: modules
617 618 619 620 621 622 623 624 625 626
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)
627
  KBUILD_BUILTIN :=
628 629 630 631 632 633
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

634
ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
635 636 637 638 639 640 641 642 643
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

644
ifdef need-config
645 646 647
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
650
core-y		:= init/ usr/
651
drivers-y	:= drivers/ sound/
652
drivers-$(CONFIG_SAMPLES) += samples/
653
drivers-y	+= net/ virt/
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libs-y		:= lib/
endif # KBUILD_EXTMOD

657 658 659 660 661 662 663 664 665
# 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,)
666
export CFLAGS_GCOV
667

668 669 670 671 672
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

673 674 675 676 677 678 679 680
ifdef CONFIG_CC_IS_GCC
RETPOLINE_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
RETPOLINE_VDSO_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
endif
ifdef CONFIG_CC_IS_CLANG
RETPOLINE_CFLAGS	:= -mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS	:= -mretpoline
endif
681 682 683
export RETPOLINE_CFLAGS
export RETPOLINE_VDSO_CFLAGS

684
include arch/$(SRCARCH)/Makefile
L
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685

686 687
ifdef need-config
ifdef may-sync-config
688 689 690
# 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.
691
include include/config/auto.conf.cmd
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693 694 695 696 697 698 699 700
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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702 703 704
# 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).
705 706 707
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
708
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
709 710 711
#
# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
# so you cannot notice that Kconfig is waiting for the user input.
712
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
713 714
	$(Q)$(kecho) "  SYNC    $@"
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
715
else # !may-sync-config
716 717 718
# 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
719 720 721
PHONY += include/config/auto.conf

include/config/auto.conf:
722
	$(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 ;							\
728 729
	/bin/false)

730
endif # may-sync-config
731
endif # need-config
L
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732

733
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
734
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
735 736
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
737
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
738

739 740 741 742 743 744
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
745
endif
L
Linus Torvalds 已提交
746

747 748
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
749
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
750

A
Andi Kleen 已提交
751 752 753 754 755 756 757 758 759 760
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

761
ifneq ($(CONFIG_FRAME_WARN),0)
762
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
763 764
endif

765
stackp-flags-y                                    := -fno-stack-protector
766 767
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
768 769

KBUILD_CFLAGS += $(stackp-flags-y)
770

771
ifdef CONFIG_CC_IS_CLANG
772 773 774
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
775 776 777
# 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
778
KBUILD_CFLAGS += -mno-global-merge
779 780
else

781 782 783 784
# 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,)
785 786
endif

787 788 789 790
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)

791
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
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792
ifdef CONFIG_FRAME_POINTER
793
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
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794
else
795 796 797 798 799 800
# 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
801
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
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802
endif
803
endif
L
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804

805 806
# Initialize all stack variables with a 0xAA pattern.
ifdef CONFIG_INIT_STACK_ALL_PATTERN
807 808 809
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

810 811 812 813 814 815 816 817 818
# 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

819 820
DEBUG_CFLAGS	:=

821 822 823
# Workaround for GCC versions < 5.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
ifdef CONFIG_CC_IS_GCC
824
DEBUG_CFLAGS	+= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
825
endif
826

L
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827
ifdef CONFIG_DEBUG_INFO
828

A
Andi Kleen 已提交
829
ifdef CONFIG_DEBUG_INFO_SPLIT
830
DEBUG_CFLAGS	+= -gsplit-dwarf
A
Andi Kleen 已提交
831
else
832
DEBUG_CFLAGS	+= -g
A
Andi Kleen 已提交
833
endif
834

835
ifneq ($(LLVM_IAS),1)
836
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
837
endif
838

839
ifdef CONFIG_DEBUG_INFO_DWARF4
840
DEBUG_CFLAGS	+= -gdwarf-4
841
endif
L
Linus Torvalds 已提交
842

843
ifdef CONFIG_DEBUG_INFO_REDUCED
844
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
845
		   $(call cc-option,-fno-var-tracking)
846 847
endif

848 849
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
850
KBUILD_AFLAGS	+= -gz=zlib
851 852 853
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

854 855
endif # CONFIG_DEBUG_INFO

856 857 858
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

859
ifdef CONFIG_FUNCTION_TRACER
860 861 862 863 864 865
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
866 867 868 869 870 871
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
872
endif
873
ifdef CONFIG_HAVE_FENTRY
874 875 876 877
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
878
endif
879 880 881
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
882
ifdef CONFIG_DYNAMIC_FTRACE
883
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
884 885 886 887
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
888 889
endif

890 891 892 893 894
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

895
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
896 897
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
898 899
endif

900 901 902 903 904 905
ifdef CONFIG_SHADOW_CALL_STACK
CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
export CC_FLAGS_SCS
endif

906 907 908 909
ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
KBUILD_CFLAGS += -falign-functions=32
endif

910
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
911
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
912

L
Linus Torvalds 已提交
913
# warn about C99 declaration after statement
914
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
915

K
Kees Cook 已提交
916
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
917
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
918

S
Sam Ravnborg 已提交
919
# disable pointer signed / unsigned warnings in gcc 4.0
920
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
921

922 923 924
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

925 926
# 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)
927
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
928
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
929

930 931 932
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

933 934 935
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

936
# disable invalid "can't wrap" optimizations for signed / pointers
937
KBUILD_CFLAGS	+= -fno-strict-overflow
938

939
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
940
KBUILD_CFLAGS  += -fno-stack-check
941

942 943 944
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

945
# Prohibit date/time macros, which would make the build non-deterministic
946
KBUILD_CFLAGS   += -Werror=date-time
947

948 949 950
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

951 952 953
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

954
# change __FILE__ to the relative path from the srctree
955
KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
956

957 958 959 960 961 962 963 964 965
# 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))
966

967 968 969
# 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.
970

971 972 973 974
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
975

976 977
KBUILD_LDFLAGS_MODULE += --build-id=sha1
LDFLAGS_vmlinux += --build-id=sha1
R
Roland McGrath 已提交
978

979
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
980
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
981 982
endif

983
ifeq ($(CONFIG_RELR),y)
984
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
985 986
endif

987 988 989 990 991 992
# We never want expected sections to be placed heuristically by the
# linker. All sections should be explicitly named in the linker script.
ifdef CONFIG_LD_ORPHAN_WARN
LDFLAGS_vmlinux += --orphan-handling=warn
endif

993
# Align the bit size of userspace programs with the kernel
994 995
KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
996

997 998 999
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

1000 1001 1002
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

1003 1004 1005
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
1006
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
1007
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
# 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

1018 1019 1020 1021 1022 1023 1024
#
# 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
1025 1026 1027
#
# 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
1028
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
1029 1030
#

1031
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
1032 1033
export MODLIB

1034
#
1035 1036 1037 1038
# 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.
1039

1040 1041
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
1042
mod_strip_cmd = $(STRIP) --strip-debug
1043
else
1044
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1045 1046
endif # INSTALL_MOD_STRIP=1
else
1047
mod_strip_cmd = true
1048 1049 1050
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1051 1052 1053 1054 1055 1056 1057
# 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
1058
    mod_compress_cmd = $(KGZIP) -n -f
1059 1060
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1061
    mod_compress_cmd = $(XZ) -f
1062 1063 1064 1065
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1066
ifdef CONFIG_MODULE_SIG_ALL
1067 1068 1069
$(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
1070 1071 1072 1073 1074
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1075 1076
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1077
has_libelf = $(call try-run,\
1078
               echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1079

1080 1081 1082 1083 1084 1085 1086 1087 1088
ifdef CONFIG_STACK_VALIDATION
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1089 1090
PHONY += resolve_btfids_clean

1091 1092 1093 1094
resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids

# tools/bpf/resolve_btfids directory might not exist
# in output directory, skip its clean in that case
1095
resolve_btfids_clean:
1096 1097 1098
ifneq ($(wildcard $(resolve_btfids_O)),)
	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
endif
1099

1100
ifdef CONFIG_BPF
1101 1102 1103 1104 1105 1106
ifdef CONFIG_DEBUG_INFO_BTF
  ifeq ($(has_libelf),1)
    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
  else
    ERROR_RESOLVE_BTFIDS := 1
  endif
1107 1108
endif # CONFIG_DEBUG_INFO_BTF
endif # CONFIG_BPF
1109

1110
PHONY += prepare0
1111

1112
export MODORDER := $(extmod-prefix)modules.order
1113
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1114

L
Linus Torvalds 已提交
1115
ifeq ($(KBUILD_EXTMOD),)
1116
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1117

1118
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
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1119
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1120
		     $(libs-y) $(libs-m)))
L
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1121

1122
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1123
		     $(patsubst %/,%,$(filter %/, $(core-) \
1124
			$(drivers-) $(libs-))))
L
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1125

1126 1127 1128
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))
L
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1129

1130
build-dirs	:= $(vmlinux-dirs)
1131
clean-dirs	:= $(vmlinux-alldirs)
1132

1133 1134 1135
# 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)))
1136
ifdef CONFIG_MODULES
1137 1138
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1139
else
1140
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1141
endif
1142
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1143

1144
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1145
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1146
# used by scripts/Makefile.package
1147
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1148

1149
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
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1150

1151 1152
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1153
ifdef CONFIG_TRIM_UNUSED_KSYMS
1154 1155 1156
# 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)
1157 1158 1159 1160 1161
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1162 1163
endif

1164 1165
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1166 1167 1168 1169
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1170
$(autoksyms_h):
1171
	$(call cmd,autoksyms_h)
1172

1173 1174 1175
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1176
cmd_link-vmlinux =                                                 \
1177
	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1178
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1179

1180
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1181
	+$(call if_changed,link-vmlinux)
1182

1183 1184
targets := vmlinux

1185
# The actual objects are generated when descending,
L
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1186
# make sure no implicit rule kicks in
1187
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
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1188

1189
filechk_kernel.release = \
1190 1191
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1192
# Store (new) KERNELRELEASE string in include/config/kernel.release
1193
include/config/kernel.release: FORCE
1194
	$(call filechk,kernel.release)
1195

1196 1197 1198 1199
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1200
scripts: scripts_basic scripts_dtc
1201
	$(Q)$(MAKE) $(build)=$(@)
1202

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1203
# Things we need to do before we recursively start building the kernel
1204 1205 1206 1207
# 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
Linus Torvalds 已提交
1208

M
Masahiro Yamada 已提交
1209
PHONY += prepare archprepare
1210

1211
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1212 1213
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1214

1215
prepare0: archprepare
1216
	$(Q)$(MAKE) $(build)=scripts/mod
1217
	$(Q)$(MAKE) $(build)=.
1218

L
Linus Torvalds 已提交
1219
# All the preparing..
1220
prepare: prepare0 prepare-objtool prepare-resolve_btfids
1221

1222
# Support for using generic headers in asm-generic
1223 1224
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1225 1226
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1227 1228
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1229
uapi-asm-generic:
1230 1231
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1232

1233
PHONY += prepare-objtool prepare-resolve_btfids
1234
prepare-objtool: $(objtool_target)
1235 1236 1237 1238 1239 1240 1241 1242
ifeq ($(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
1243

1244 1245 1246 1247 1248
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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1249 1250 1251 1252 1253 1254 1255
# 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
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Sam Ravnborg 已提交
1256 1257 1258 1259 1260
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1261
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1262
endef
L
Linus Torvalds 已提交
1263 1264

define filechk_version.h
S
Sasha Levin 已提交
1265 1266
	if [ $(SUBLEVEL) -gt 255 ]; then                                 \
		echo \#define LINUX_VERSION_CODE $(shell                 \
1267
		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
S
Sasha Levin 已提交
1268 1269
	else                                                             \
		echo \#define LINUX_VERSION_CODE $(shell                 \
1270
		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
S
Sasha Levin 已提交
1271 1272 1273
	fi;                                                              \
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
	((c) > 255 ? 255 : (c)))'
L
Linus Torvalds 已提交
1274 1275
endef

1276 1277
$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1278
$(version_h): FORCE
L
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1279
	$(call filechk,version.h)
1280
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1281

1282
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1283 1284
	$(call filechk,utsrelease.h)

1285 1286
PHONY += headerdep
headerdep:
1287 1288
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1289

1290 1291 1292
# ---------------------------------------------------------------------------
# Kernel headers

1293 1294
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1295

1296 1297 1298 1299 1300
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)
1301

1302
PHONY += headers_install
1303 1304
headers_install: headers
	$(call cmd,headers_install)
1305

1306
PHONY += archheaders archscripts
1307

1308
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1309

1310 1311
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1312
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1313
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1314 1315
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1316

1317
# Deprecated. It is no-op now.
1318
PHONY += headers_check
1319 1320
headers_check:
	@:
1321

1322
ifdef CONFIG_HEADERS_INSTALL
1323
prepare: headers
1324
endif
1325

1326 1327 1328 1329
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1330 1331 1332 1333 1334
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1335
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1336

1337 1338
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1339

1340 1341 1342
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1343 1344
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1345
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1346

1347 1348 1349 1350 1351 1352 1353 1354 1355
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1356
%.dtb: include/config/kernel.release scripts_dtc
1357 1358
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1359
PHONY += dtbs dtbs_install dtbs_check
1360
dtbs: include/config/kernel.release scripts_dtc
1361 1362
	$(Q)$(MAKE) $(build)=$(dtstree)

1363
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1364
export CHECK_DTBS=y
1365 1366 1367 1368
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1369

1370
dtbs_install:
1371
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1383 1384 1385 1386
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1387
PHONY += dt_binding_check
1388 1389 1390
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1391 1392 1393 1394 1395
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1396
# By default, build modules as well
L
Linus Torvalds 已提交
1397

1398
all: modules
L
Linus Torvalds 已提交
1399

1400 1401 1402 1403 1404 1405 1406
# 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

1407
# Build modules
T
Tejun Heo 已提交
1408
#
1409 1410 1411
# 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
1412

1413
PHONY += modules
1414
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
S
Sam Ravnborg 已提交
1415
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1416

1417 1418 1419
PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1420

1421 1422 1423 1424 1425 1426
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

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

targets += modules.order
1427

L
Linus Torvalds 已提交
1428
# Target to prepare building external modules
1429
PHONY += modules_prepare
1430
modules_prepare: prepare
1431
	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
L
Linus Torvalds 已提交
1432 1433

# Target to install modules
1434
PHONY += modules_install
L
Linus Torvalds 已提交
1435 1436
modules_install: _modinst_ _modinst_post

1437
PHONY += _modinst_
1438
_modinst_:
L
Linus Torvalds 已提交
1439 1440 1441
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1442
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1443 1444
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1445
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1446
	fi
1447
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1448 1449
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1450
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1451

1452
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1453 1454
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1455
PHONY += _modinst_post
1456
_modinst_post: _modinst_
1457
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1458

J
Josh Boyer 已提交
1459 1460 1461 1462 1463 1464
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1465 1466 1467 1468 1469
else # CONFIG_MODULES

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

1470 1471
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1472 1473 1474 1475 1476
	@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
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488
	@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'
1489
CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1490 1491
	       modules.builtin modules.builtin.modinfo modules.nsdeps \
	       compile_commands.json
L
Linus Torvalds 已提交
1492 1493

# Directories & files removed with 'make mrproper'
1494
MRPROPER_FILES += include/config include/generated          \
1495
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1496 1497
		  debian snap tar-install \
		  .config .config.old .version \
1498
		  Module.symvers \
1499 1500
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1501 1502
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1503

1504 1505 1506
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1507 1508 1509 1510
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1511
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1512

1513 1514
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1515
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1516

1517
clean: archclean vmlinuxclean resolve_btfids_clean
L
Linus Torvalds 已提交
1518 1519 1520 1521

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1522
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1523

1524
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1525 1526 1527
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1528
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1529 1530 1531 1532
	$(call cmd,rmfiles)

# distclean
#
1533 1534
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1535
PHONY += distclean
L
Linus Torvalds 已提交
1536 1537

distclean: mrproper
1538
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1539
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1540
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1541 1542
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1543 1544 1545 1546 1547 1548
		-type f -print | xargs rm -f


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

1549
%src-pkg: FORCE
1550
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1551
%pkg: include/config/kernel.release FORCE
1552
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1553 1554 1555 1556

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

1557
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1558
boards := $(sort $(notdir $(boards)))
1559 1560
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1561

1562
PHONY += help
L
Linus Torvalds 已提交
1563 1564
help:
	@echo  'Cleaning targets:'
1565
	@echo  '  clean		  - Remove most generated files but keep the config and'
1566
	@echo  '                    enough build support to build external modules'
1567
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1568
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1569 1570 1571 1572 1573 1574 1575 1576
	@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'
1577
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1578
	@echo  '  dir/            - Build all files in dir and below'
1579
	@echo  '  dir/file.[ois]  - Build specified target only'
1580 1581
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1582 1583
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1584
	@echo  '  dir/file.ko     - Build module including final link'
1585
	@echo  '  modules_prepare - Set up for building external modules'
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	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1588
	@echo  '  gtags           - Generate GNU GLOBAL index'
1589 1590 1591
	@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)'
1592
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1593
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1594
	 echo  ''
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	@echo  'Static analysers:'
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	@echo  '  checkstack      - Generate a list of stack hogs'
1597
	@echo  '  versioncheck    - Sanity check on version.h usage'
1598
	@echo  '  includecheck    - Check for duplicate included header files'
1599
	@echo  '  export_report   - List the usages of all exported symbols'
1600
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1601
	@echo  '  coccicheck      - Check with Coccinelle'
1602 1603
	@echo  '  clang-analyzer  - Check with clang static analyzer'
	@echo  '  clang-tidy      - Check with clang-tidy'
1604
	@echo  ''
1605 1606 1607
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
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	@echo  'Kernel selftest:'
1609 1610 1611 1612 1613 1614 1615 1616 1617
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1618
	@echo  ''
1619 1620
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1621 1622 1623 1624
		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';\
1625 1626
		echo '')

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	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
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	@echo  'Kernel packaging:'
1632
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
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1633 1634
	@echo  ''
	@echo  'Documentation targets:'
1635
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
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1636
	@echo  ''
1637
	@echo  'Architecture specific targets ($(SRCARCH)):'
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1638
	@$(if $(archhelp),$(archhelp),\
1639
		echo '  No architecture specific help defined for $(SRCARCH)')
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	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1643
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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		echo '')
1645 1646 1647 1648 1649
	@$(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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	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1652
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
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	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1654 1655
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1656
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1657
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1658
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1659 1660 1661
	@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'
1662
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1668 1669 1670 1671
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1672
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1673 1674 1675 1676 1677 1678 1679 1680 1681

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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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1682 1683
# Documentation targets
# ---------------------------------------------------------------------------
1684 1685
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1686
PHONY += $(DOC_TARGETS)
1687
$(DOC_TARGETS):
1688
	$(Q)$(MAKE) $(build)=Documentation $@
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1689

1690 1691 1692 1693
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1694
scripts_gdb: prepare0
1695
	$(Q)$(MAKE) $(build)=scripts/gdb
1696
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1697 1698 1699 1700 1701

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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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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#                      Install the modules built in the module directory
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1719 1720
#                      Assumes install directory is already created

1721 1722
# We are always building only modules.
KBUILD_BUILTIN :=
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1723 1724
KBUILD_MODULES := 1

1725 1726
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1727
modules: $(MODORDER)
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1728
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1729

1730 1731 1732
$(MODORDER): descend
	@:

1733
PHONY += modules_install
1734
modules_install: _emodinst_ _emodinst_post
1735

1736 1737
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1738 1739
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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1740
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1741

1742
PHONY += _emodinst_post
1743 1744 1745
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1746 1747 1748
compile_commands.json: $(extmod-prefix)compile_commands.json
PHONY += compile_commands.json

1749
clean-dirs := $(KBUILD_EXTMOD)
1750 1751
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
	$(KBUILD_EXTMOD)/compile_commands.json
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1752

1753
PHONY += help
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1754 1755 1756 1757 1758 1759 1760 1761
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  ''
1762

1763 1764 1765
# no-op for external module builds
PHONY += prepare modules_prepare

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endif # KBUILD_EXTMOD

1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
# 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
1798
single_modpost: $(single-no-ko) modules_prepare
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
	$(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

1812 1813 1814 1815
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1816 1817 1818 1819 1820 1821 1822 1823
# 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
1824
	$(Q)$(MAKE) $(build)=$@ \
1825
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1826
	need-builtin=1 need-modorder=1
1827

1828 1829 1830 1831 1832
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1833 1834
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1835
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1836
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1837 1838
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1839
		-o -name '*.dwo' -o -name '*.lst' \
1840
		-o -name '*.su' -o -name '*.mod' \
1841
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1842
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1843
		-o -name '*.asn1.[ch]' \
1844
		-o -name '*.symtypes' -o -name 'modules.order' \
1845
		-o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1847
		-o -name '*.ll' \
1848 1849
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1852
quiet_cmd_tags = GEN     $@
1853
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
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1855
tags TAGS cscope gtags: FORCE
L
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1856 1857
	$(call cmd,tags)

1858 1859 1860 1861
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1862
nsdeps: export KBUILD_NSDEPS=1
1863
nsdeps: modules
1864
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1865

1866 1867 1868 1869 1870 1871
# Clang Tooling
# ---------------------------------------------------------------------------

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

1872
$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1873 1874 1875 1876 1877 1878
	$(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

1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
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

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# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

J
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1896
PHONY += includecheck versioncheck coccicheck export_report
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1897

L
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1898
includecheck:
1899
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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		-name '*.[hcS]' -type f -print | sort \
1901
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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1902 1903

versioncheck:
1904
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1905
		-name '*.[hcS]' -type f -print | sort \
1906
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
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1907

1908
coccicheck:
1909
	$(Q)$(BASH) $(srctree)/scripts/$@
1910

1911 1912 1913
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1914
PHONY += checkstack kernelrelease kernelversion image_name
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1915

J
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1916 1917 1918 1919 1920 1921 1922 1923 1924
# 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
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1925 1926
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1927
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
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1928

1929 1930
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1931

1932
kernelversion:
1933
	@echo $(KERNELVERSION)
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1934

1935 1936 1937
image_name:
	@echo $(KBUILD_IMAGE)

1938
# Clear a bunch of variables before executing the submake
1939 1940 1941 1942 1943

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

1944
tools/: FORCE
1945
	$(Q)mkdir -p $(objtree)/tools
1946
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1947 1948

tools/%: FORCE
1949
	$(Q)mkdir -p $(objtree)/tools
1950
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1951

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quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1953
      cmd_rmfiles = rm -rf $(rm-files)
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1954

1955
# Run depmod only if we have System.map and depmod is executable
1956
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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1957
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1958
                   $(KERNELRELEASE)
1959

1960 1961
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1962

1963
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1964

1965
endif # config-build
1966 1967
endif # mixed-build
endif # need-sub-make
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1968

1969
PHONY += FORCE
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1970
FORCE:
1971

1972
# Declare the contents of the PHONY variable as phony.  We keep that
1973
# information in a variable so we can use it in if_changed and friends.
1974
.PHONY: $(PHONY)