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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
S
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600 601
	$(Q)$(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
L
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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

673 674 675 676 677 678 679 680 681
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

682
include arch/$(SRCARCH)/Makefile
L
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683

684 685
ifdef need-config
ifdef may-sync-config
686 687 688
# 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.
689
include include/config/auto.conf.cmd
L
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691 692 693 694 695 696 697 698
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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
L
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699

700 701 702
# 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).
703 704 705
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
706
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
707 708 709
#
# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
# so you cannot notice that Kconfig is waiting for the user input.
710
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
711 712
	$(Q)$(kecho) "  SYNC    $@"
	$(Q)$(MAKE) -f $(srctree)/Makefile 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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721 722 723 724 725
	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
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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

A
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
else

779 780 781 782
# 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,)
783 784
endif

785 786 787 788
# 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)

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

817 818
DEBUG_CFLAGS	:=

819 820 821
# Workaround for GCC versions < 5.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
ifdef CONFIG_CC_IS_GCC
822
DEBUG_CFLAGS	+= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
823
endif
824

L
Linus Torvalds 已提交
825
ifdef CONFIG_DEBUG_INFO
826

A
Andi Kleen 已提交
827
ifdef CONFIG_DEBUG_INFO_SPLIT
828
DEBUG_CFLAGS	+= -gsplit-dwarf
A
Andi Kleen 已提交
829
else
830
DEBUG_CFLAGS	+= -g
A
Andi Kleen 已提交
831
endif
832

833
ifneq ($(LLVM_IAS),1)
834
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
835
endif
836

837
ifdef CONFIG_DEBUG_INFO_DWARF4
838
DEBUG_CFLAGS	+= -gdwarf-4
839
endif
L
Linus Torvalds 已提交
840

841
ifdef CONFIG_DEBUG_INFO_REDUCED
842
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
843
		   $(call cc-option,-fno-var-tracking)
844 845
endif

846 847
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
848
KBUILD_AFLAGS	+= -gz=zlib
849 850 851
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

852 853
endif # CONFIG_DEBUG_INFO

854 855 856
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

857
ifdef CONFIG_FUNCTION_TRACER
858 859 860 861 862 863
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
864 865 866 867 868 869
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
870
endif
871
ifdef CONFIG_HAVE_FENTRY
872 873 874 875
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
876
endif
877 878 879
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
880
ifdef CONFIG_DYNAMIC_FTRACE
881
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
882 883 884 885
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
886 887
endif

888 889 890 891 892
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

893
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
894 895
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
896 897
endif

898 899 900 901 902 903
ifdef CONFIG_SHADOW_CALL_STACK
CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
export CC_FLAGS_SCS
endif

904 905 906 907
ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
KBUILD_CFLAGS += -falign-functions=32
endif

908
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
909
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
910

L
Linus Torvalds 已提交
911
# warn about C99 declaration after statement
912
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
913

K
Kees Cook 已提交
914
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
915
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
916

S
Sam Ravnborg 已提交
917
# disable pointer signed / unsigned warnings in gcc 4.0
918
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
919

920 921 922
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

923 924
# 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)
925
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
926
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
927

928 929 930
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

931 932 933
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

934
# disable invalid "can't wrap" optimizations for signed / pointers
935
KBUILD_CFLAGS	+= -fno-strict-overflow
936

937
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
938
KBUILD_CFLAGS  += -fno-stack-check
939

940 941 942
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

943
# Prohibit date/time macros, which would make the build non-deterministic
944
KBUILD_CFLAGS   += -Werror=date-time
945

946 947 948
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

949 950 951
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

952
# change __FILE__ to the relative path from the srctree
953
KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
954

955 956 957 958 959 960 961 962 963
# 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))
964

965 966 967
# 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.
968

969 970 971 972
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
973

974 975
KBUILD_LDFLAGS_MODULE += --build-id=sha1
LDFLAGS_vmlinux += --build-id=sha1
R
Roland McGrath 已提交
976

977
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
978
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
979 980
endif

981
ifeq ($(CONFIG_RELR),y)
982
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
983 984
endif

985 986 987 988 989 990
# 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

991
# Align the bit size of userspace programs with the kernel
992 993
KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
994

995 996 997
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

998 999 1000
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

1001 1002 1003
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
1004
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
1005
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
# 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

1016 1017 1018 1019 1020 1021 1022
#
# 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
1023 1024 1025
#
# 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
1026
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
1027 1028
#

1029
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
1030 1031
export MODLIB

1032
#
1033 1034 1035 1036
# 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.
1037

1038 1039
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
1040
mod_strip_cmd = $(STRIP) --strip-debug
1041
else
1042
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1043 1044
endif # INSTALL_MOD_STRIP=1
else
1045
mod_strip_cmd = true
1046 1047 1048
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1049 1050 1051 1052 1053 1054 1055
# 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
1056
    mod_compress_cmd = $(KGZIP) -n -f
1057 1058
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1059
    mod_compress_cmd = $(XZ) -f
1060 1061 1062 1063
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1064
ifdef CONFIG_MODULE_SIG_ALL
1065 1066 1067
$(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
1068 1069 1070 1071 1072
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1073 1074
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1075 1076 1077
has_libelf = $(call try-run,\
               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)

1078 1079 1080 1081 1082 1083 1084 1085 1086
ifdef CONFIG_STACK_VALIDATION
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1087 1088
PHONY += resolve_btfids_clean

1089 1090 1091 1092
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
1093
resolve_btfids_clean:
1094 1095 1096
ifneq ($(wildcard $(resolve_btfids_O)),)
	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
endif
1097

1098
ifdef CONFIG_BPF
1099 1100 1101 1102 1103 1104
ifdef CONFIG_DEBUG_INFO_BTF
  ifeq ($(has_libelf),1)
    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
  else
    ERROR_RESOLVE_BTFIDS := 1
  endif
1105 1106
endif # CONFIG_DEBUG_INFO_BTF
endif # CONFIG_BPF
1107

1108
PHONY += prepare0
1109

1110
export MODORDER := $(extmod-prefix)modules.order
1111
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1112

L
Linus Torvalds 已提交
1113
ifeq ($(KBUILD_EXTMOD),)
1114
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1115

1116
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
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1117
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1118
		     $(libs-y) $(libs-m)))
L
Linus Torvalds 已提交
1119

1120
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1121
		     $(patsubst %/,%,$(filter %/, $(core-) \
1122
			$(drivers-) $(libs-))))
L
Linus Torvalds 已提交
1123

1124 1125 1126
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))
L
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1127

1128
build-dirs	:= $(vmlinux-dirs)
1129
clean-dirs	:= $(vmlinux-alldirs)
1130

1131 1132 1133
# 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)))
1134
ifdef CONFIG_MODULES
1135 1136
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1137
else
1138
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1139
endif
1140
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1141

1142
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1143
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1144
# used by scripts/Makefile.package
1145
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1146

1147
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1148

1149 1150
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1151
ifdef CONFIG_TRIM_UNUSED_KSYMS
1152 1153 1154
# 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)
1155 1156 1157 1158 1159
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1160 1161
endif

1162 1163
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1164 1165 1166 1167
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1168
$(autoksyms_h):
1169
	$(call cmd,autoksyms_h)
1170

1171 1172 1173
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1174
cmd_link-vmlinux =                                                 \
1175
	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1176
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1177

1178
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1179
	+$(call if_changed,link-vmlinux)
1180

1181 1182
targets := vmlinux

1183
# The actual objects are generated when descending,
L
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1184
# make sure no implicit rule kicks in
1185
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
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1186

1187
filechk_kernel.release = \
1188 1189
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1190
# Store (new) KERNELRELEASE string in include/config/kernel.release
1191
include/config/kernel.release: FORCE
1192
	$(call filechk,kernel.release)
1193

1194 1195 1196 1197
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1198
scripts: scripts_basic scripts_dtc
1199
	$(Q)$(MAKE) $(build)=$(@)
1200

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1201
# Things we need to do before we recursively start building the kernel
1202 1203 1204 1205
# 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
1206

M
Masahiro Yamada 已提交
1207
PHONY += prepare archprepare
1208

1209
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1210 1211
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1212

1213
prepare0: archprepare
1214
	$(Q)$(MAKE) $(build)=scripts/mod
1215
	$(Q)$(MAKE) $(build)=.
1216

L
Linus Torvalds 已提交
1217
# All the preparing..
1218
prepare: prepare0 prepare-objtool prepare-resolve_btfids
1219

1220
# Support for using generic headers in asm-generic
1221 1222
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1223 1224
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1225 1226
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1227
uapi-asm-generic:
1228 1229
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1230

1231
PHONY += prepare-objtool prepare-resolve_btfids
1232
prepare-objtool: $(objtool_target)
1233 1234 1235 1236 1237 1238 1239 1240
ifeq ($(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
1241

1242 1243 1244 1245 1246
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
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253
# 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
1254 1255 1256 1257 1258
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1259
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1260
endef
L
Linus Torvalds 已提交
1261 1262

define filechk_version.h
S
Sasha Levin 已提交
1263 1264
	if [ $(SUBLEVEL) -gt 255 ]; then                                 \
		echo \#define LINUX_VERSION_CODE $(shell                 \
1265
		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
S
Sasha Levin 已提交
1266 1267
	else                                                             \
		echo \#define LINUX_VERSION_CODE $(shell                 \
1268
		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
S
Sasha Levin 已提交
1269 1270 1271
	fi;                                                              \
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
	((c) > 255 ? 255 : (c)))'
L
Linus Torvalds 已提交
1272 1273
endef

1274 1275
$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1276
$(version_h): FORCE
L
Linus Torvalds 已提交
1277
	$(call filechk,version.h)
1278
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1279

1280
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1281 1282
	$(call filechk,utsrelease.h)

1283 1284
PHONY += headerdep
headerdep:
1285 1286
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1287

1288 1289 1290
# ---------------------------------------------------------------------------
# Kernel headers

1291 1292
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1293

1294 1295 1296 1297 1298
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)
1299

1300
PHONY += headers_install
1301 1302
headers_install: headers
	$(call cmd,headers_install)
1303

1304
PHONY += archheaders archscripts
1305

1306
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1307

1308 1309
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1310
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1311
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1312 1313
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1314

1315
# Deprecated. It is no-op now.
1316
PHONY += headers_check
1317 1318
headers_check:
	@:
1319

1320
ifdef CONFIG_HEADERS_INSTALL
1321
prepare: headers
1322
endif
1323

1324 1325 1326 1327
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1328 1329 1330 1331 1332
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1333
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1334

1335 1336
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1337

1338 1339 1340
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1341 1342
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1343
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1344

1345 1346 1347 1348 1349 1350 1351 1352 1353
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1354
%.dtb: include/config/kernel.release scripts_dtc
1355 1356
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1357
PHONY += dtbs dtbs_install dtbs_check
1358
dtbs: include/config/kernel.release scripts_dtc
1359 1360
	$(Q)$(MAKE) $(build)=$(dtstree)

1361
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1362
export CHECK_DTBS=y
1363 1364 1365 1366
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1367

1368
dtbs_install:
1369
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1381 1382 1383 1384
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1385
PHONY += dt_binding_check
1386 1387 1388
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1389 1390 1391 1392 1393
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1394
# By default, build modules as well
L
Linus Torvalds 已提交
1395

1396
all: modules
L
Linus Torvalds 已提交
1397

1398 1399 1400 1401 1402 1403 1404
# 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

1405
# Build modules
T
Tejun Heo 已提交
1406
#
1407 1408 1409
# 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
1410

1411
PHONY += modules
1412
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
S
Sam Ravnborg 已提交
1413
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1414

1415 1416 1417
PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1418

1419 1420 1421 1422 1423 1424
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

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

targets += modules.order
1425

L
Linus Torvalds 已提交
1426
# Target to prepare building external modules
1427
PHONY += modules_prepare
1428
modules_prepare: prepare
1429
	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
L
Linus Torvalds 已提交
1430 1431

# Target to install modules
1432
PHONY += modules_install
L
Linus Torvalds 已提交
1433 1434
modules_install: _modinst_ _modinst_post

1435
PHONY += _modinst_
1436
_modinst_:
L
Linus Torvalds 已提交
1437 1438 1439
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1440
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1441 1442
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1443
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1444
	fi
1445
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1446 1447
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1448
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1449

1450
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1451 1452
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1453
PHONY += _modinst_post
1454
_modinst_post: _modinst_
1455
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1456

J
Josh Boyer 已提交
1457 1458 1459 1460 1461 1462
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1463 1464 1465 1466 1467
else # CONFIG_MODULES

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

1468 1469
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1470 1471 1472 1473 1474
	@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
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	@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'
1487
CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1488 1489
	       modules.builtin modules.builtin.modinfo modules.nsdeps \
	       compile_commands.json
L
Linus Torvalds 已提交
1490 1491

# Directories & files removed with 'make mrproper'
1492
MRPROPER_FILES += include/config include/generated          \
1493
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1494 1495
		  debian snap tar-install \
		  .config .config.old .version \
1496
		  Module.symvers \
1497 1498
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1499 1500
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1501

1502 1503 1504
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1505 1506 1507 1508
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1509
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1510

1511 1512
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1513
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1514

1515
clean: archclean vmlinuxclean resolve_btfids_clean
L
Linus Torvalds 已提交
1516 1517 1518 1519

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1520
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1521

1522
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1523 1524 1525
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1526
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1527 1528 1529 1530
	$(call cmd,rmfiles)

# distclean
#
1531 1532
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1533
PHONY += distclean
L
Linus Torvalds 已提交
1534 1535

distclean: mrproper
1536
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1537
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1538
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1539 1540
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1541 1542 1543 1544 1545 1546
		-type f -print | xargs rm -f


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

1547
%src-pkg: FORCE
1548
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1549
%pkg: include/config/kernel.release FORCE
1550
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1551 1552 1553 1554

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

1555
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1556
boards := $(sort $(notdir $(boards)))
1557 1558
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1559

1560
PHONY += help
L
Linus Torvalds 已提交
1561 1562
help:
	@echo  'Cleaning targets:'
1563
	@echo  '  clean		  - Remove most generated files but keep the config and'
1564
	@echo  '                    enough build support to build external modules'
1565
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1566
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1567 1568 1569 1570 1571 1572 1573 1574
	@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'
1575
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1576
	@echo  '  dir/            - Build all files in dir and below'
1577
	@echo  '  dir/file.[ois]  - Build specified target only'
1578 1579
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1580 1581
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1582
	@echo  '  dir/file.ko     - Build module including final link'
1583
	@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'
1586
	@echo  '  gtags           - Generate GNU GLOBAL index'
1587 1588 1589
	@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)'
1590
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1591
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1592
	 echo  ''
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	@echo  'Static analysers:'
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	@echo  '  checkstack      - Generate a list of stack hogs'
1595
	@echo  '  versioncheck    - Sanity check on version.h usage'
1596
	@echo  '  includecheck    - Check for duplicate included header files'
1597
	@echo  '  export_report   - List the usages of all exported symbols'
1598
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1599
	@echo  '  coccicheck      - Check with Coccinelle'
1600 1601
	@echo  '  clang-analyzer  - Check with clang static analyzer'
	@echo  '  clang-tidy      - Check with clang-tidy'
1602
	@echo  ''
1603 1604 1605
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
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	@echo  'Kernel selftest:'
1607 1608 1609 1610 1611 1612 1613 1614 1615
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1616
	@echo  ''
1617 1618
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1619 1620 1621 1622
		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';\
1623 1624
		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:'
1630
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
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1631 1632
	@echo  ''
	@echo  'Documentation targets:'
1633
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
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1634
	@echo  ''
1635
	@echo  'Architecture specific targets ($(SRCARCH)):'
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1636
	@$(if $(archhelp),$(archhelp),\
1637
		echo '  No architecture specific help defined for $(SRCARCH)')
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1638 1639 1640
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1641
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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		echo '')
1643 1644 1645 1646 1647
	@$(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'
1650
	@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'
1652 1653
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1654
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1655
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1656
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1657 1658 1659
	@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'
1660
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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1661 1662 1663 1664 1665
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1666 1667 1668 1669
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1670
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1671 1672 1673 1674 1675 1676 1677 1678 1679

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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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1680 1681
# Documentation targets
# ---------------------------------------------------------------------------
1682 1683
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1684
PHONY += $(DOC_TARGETS)
1685
$(DOC_TARGETS):
1686
	$(Q)$(MAKE) $(build)=Documentation $@
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1687

1688 1689 1690 1691
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1692
scripts_gdb: prepare0
1693
	$(Q)$(MAKE) $(build)=scripts/gdb
1694
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1695 1696 1697 1698 1699

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
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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1717 1718
#                      Assumes install directory is already created

1719 1720
# We are always building only modules.
KBUILD_BUILTIN :=
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1721 1722
KBUILD_MODULES := 1

1723 1724
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1725
modules: $(MODORDER)
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1726
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1727

1728 1729 1730
$(MODORDER): descend
	@:

1731
PHONY += modules_install
1732
modules_install: _emodinst_ _emodinst_post
1733

1734 1735
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1736 1737
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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1738
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1739

1740
PHONY += _emodinst_post
1741 1742 1743
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1744 1745 1746
compile_commands.json: $(extmod-prefix)compile_commands.json
PHONY += compile_commands.json

1747
clean-dirs := $(KBUILD_EXTMOD)
1748 1749
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
	$(KBUILD_EXTMOD)/compile_commands.json
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1751
PHONY += help
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1752 1753 1754 1755 1756 1757 1758 1759
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  ''
1760

1761 1762 1763
# no-op for external module builds
PHONY += prepare modules_prepare

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endif # KBUILD_EXTMOD

1766 1767 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
# 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
1796
single_modpost: $(single-no-ko) modules_prepare
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
	$(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

1810 1811 1812 1813
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1814 1815 1816 1817 1818 1819 1820 1821
# 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
1822
	$(Q)$(MAKE) $(build)=$@ \
1823
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1824
	need-builtin=1 need-modorder=1
1825

1826 1827 1828 1829 1830
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1831 1832
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1833
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1834
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1835 1836
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1837
		-o -name '*.dwo' -o -name '*.lst' \
1838
		-o -name '*.su' -o -name '*.mod' \
1839
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1840
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1841
		-o -name '*.asn1.[ch]' \
1842
		-o -name '*.symtypes' -o -name 'modules.order' \
1843
		-o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1845
		-o -name '*.ll' \
1846 1847
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1850
quiet_cmd_tags = GEN     $@
1851
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
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1853
tags TAGS cscope gtags: FORCE
L
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1854 1855
	$(call cmd,tags)

1856 1857 1858 1859
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1860
nsdeps: export KBUILD_NSDEPS=1
1861
nsdeps: modules
1862
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1863

1864 1865 1866 1867 1868 1869
# Clang Tooling
# ---------------------------------------------------------------------------

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

1870
$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1871 1872 1873 1874 1875 1876
	$(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

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
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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1894
PHONY += includecheck versioncheck coccicheck export_report
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1895

L
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1896
includecheck:
1897
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1898
		-name '*.[hcS]' -type f -print | sort \
1899
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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1900 1901

versioncheck:
1902
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1903
		-name '*.[hcS]' -type f -print | sort \
1904
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
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1905

1906
coccicheck:
1907
	$(Q)$(BASH) $(srctree)/scripts/$@
1908

1909 1910 1911
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1912
PHONY += checkstack kernelrelease kernelversion image_name
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1913

J
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1914 1915 1916 1917 1918 1919 1920 1921 1922
# 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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1923 1924
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1925
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
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1926

1927 1928
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1929

1930
kernelversion:
1931
	@echo $(KERNELVERSION)
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1933 1934 1935
image_name:
	@echo $(KBUILD_IMAGE)

1936
# Clear a bunch of variables before executing the submake
1937 1938 1939 1940 1941

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

1942
tools/: FORCE
1943
	$(Q)mkdir -p $(objtree)/tools
1944
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1945 1946

tools/%: FORCE
1947
	$(Q)mkdir -p $(objtree)/tools
1948
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1949

L
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quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1951
      cmd_rmfiles = rm -rf $(rm-files)
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1952

1953
# Run depmod only if we have System.map and depmod is executable
1954
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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1955
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1956
                   $(KERNELRELEASE)
1957

1958 1959
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1960

1961
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1962

1963
endif # config-build
1964 1965
endif # mixed-build
endif # need-sub-make
L
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1966

1967
PHONY += FORCE
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1968
FORCE:
1969

1970
# Declare the contents of the PHONY variable as phony.  We keep that
1971
# information in a variable so we can use it in if_changed and friends.
1972
.PHONY: $(PHONY)