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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 := $(no-dot-config-targets) %install kernelrelease
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
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single-build	:=
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ifneq ($(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))
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GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
568 569
endif
ifneq ($(GCC_TOOLCHAIN),)
570
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
571
endif
572
ifneq ($(LLVM_IAS),1)
573
CLANG_FLAGS	+= -no-integrated-as
574
endif
575
CLANG_FLAGS	+= -Werror=unknown-warning-option
576 577
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
578
export CLANG_FLAGS
579 580
endif

581 582 583 584
# 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.
585
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
586

587
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'
595
include arch/$(SRCARCH)/Makefile
596
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
L
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597

598
config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

601
%config: outputmakefile scripts_basic FORCE
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602 603
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

604
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.

609
# If building an external module we do not care about the all: rule
610
# but instead __all depend on modules
611 612
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
613
__all: all
614
else
615
__all: modules
616 617 618 619 620 621 622 623 624 625
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)
626
  KBUILD_BUILTIN :=
627 628 629 630 631 632
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

633
ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
634 635 636 637 638 639 640 641 642
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

643
ifdef need-config
644 645 646
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
649
core-y		:= init/ usr/
650
drivers-y	:= drivers/ sound/
651
drivers-$(CONFIG_SAMPLES) += samples/
652
drivers-y	+= net/ virt/
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653 654 655
libs-y		:= lib/
endif # KBUILD_EXTMOD

656 657 658 659 660 661 662 663 664
# 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,)
665
export CFLAGS_GCOV
666

667 668 669 670 671
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

672 673 674 675 676 677 678 679 680
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

681
include arch/$(SRCARCH)/Makefile
L
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683 684
ifdef need-config
ifdef may-sync-config
685 686 687
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
688
include include/config/auto.conf.cmd
L
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690 691 692 693 694 695 696 697
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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699 700 701
# 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).
702 703 704
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
705
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
706 707 708
quiet_cmd_syncconfig = SYNC    $@
      cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig

709
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
710
	+$(call cmd,syncconfig)
711
else # !may-sync-config
712 713 714
# 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
715 716 717
PHONY += include/config/auto.conf

include/config/auto.conf:
718
	$(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 ;							\
724 725
	/bin/false)

726
endif # may-sync-config
727
endif # need-config
L
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728

729
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
730
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
731 732
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
733
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
734

735 736 737 738 739 740
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
741
endif
L
Linus Torvalds 已提交
742

743 744
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
745
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
746

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Andi Kleen 已提交
747 748 749 750 751 752 753 754 755 756
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

757
ifneq ($(CONFIG_FRAME_WARN),0)
758
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
759 760
endif

761
stackp-flags-y                                    := -fno-stack-protector
762 763
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
764 765

KBUILD_CFLAGS += $(stackp-flags-y)
766

767
ifdef CONFIG_CC_IS_CLANG
768 769 770
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
771 772 773
# 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
774
KBUILD_CFLAGS += -mno-global-merge
775 776 777 778
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
779
KBUILD_CFLAGS += -Wno-unused-but-set-variable
780 781 782 783 784

# 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
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
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788
ifdef CONFIG_FRAME_POINTER
789
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
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790
else
791 792 793 794 795 796
# 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
797
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
799
endif
L
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800

801 802
# Initialize all stack variables with a 0xAA pattern.
ifdef CONFIG_INIT_STACK_ALL_PATTERN
803 804 805
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

806 807 808 809 810 811 812 813 814
# 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

815 816 817 818 819
# Workaround for GCC versions < 5.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
ifdef CONFIG_CC_IS_GCC
DEBUG_CFLAGS	:= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
endif
820

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821
ifdef CONFIG_DEBUG_INFO
822

A
Andi Kleen 已提交
823
ifdef CONFIG_DEBUG_INFO_SPLIT
824
DEBUG_CFLAGS	+= -gsplit-dwarf
A
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825
else
826
DEBUG_CFLAGS	+= -g
A
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827
endif
828

829
ifneq ($(LLVM_IAS),1)
830
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
831
endif
832

833
ifdef CONFIG_DEBUG_INFO_DWARF4
834
DEBUG_CFLAGS	+= -gdwarf-4
835
endif
L
Linus Torvalds 已提交
836

837
ifdef CONFIG_DEBUG_INFO_REDUCED
838
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
839
		   $(call cc-option,-fno-var-tracking)
840 841
endif

842 843
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
844
KBUILD_AFLAGS	+= -gz=zlib
845 846 847
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

848 849
endif # CONFIG_DEBUG_INFO

850 851 852
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

853
ifdef CONFIG_FUNCTION_TRACER
854 855 856 857 858 859
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
860 861 862 863 864 865
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
866
endif
867
ifdef CONFIG_HAVE_FENTRY
868 869 870 871
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
872
endif
873 874 875
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
876
ifdef CONFIG_DYNAMIC_FTRACE
877
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
878 879 880 881
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
882 883
endif

884 885 886 887 888
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

889
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
890 891
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
892 893
endif

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

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

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

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

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

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

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

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

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

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

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

933
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
934
KBUILD_CFLAGS  += -fno-stack-check
935

936 937 938
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

939
# Prohibit date/time macros, which would make the build non-deterministic
940
KBUILD_CFLAGS   += -Werror=date-time
941

942 943 944
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

945 946 947
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

948
# change __FILE__ to the relative path from the srctree
949
KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
950

951 952 953 954 955 956
# ensure -fcf-protection is disabled when using retpoline as it is
# incompatible with -mindirect-branch=thunk-extern
ifdef CONFIG_RETPOLINE
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
endif

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

983 984 985 986
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
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 1078 1079
has_libelf = $(call try-run,\
               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)

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
ifdef CONFIG_BPF
1090 1091 1092 1093 1094 1095
ifdef CONFIG_DEBUG_INFO_BTF
  ifeq ($(has_libelf),1)
    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
  else
    ERROR_RESOLVE_BTFIDS := 1
  endif
1096 1097
endif # CONFIG_DEBUG_INFO_BTF
endif # CONFIG_BPF
1098

1099
PHONY += prepare0
1100

1101
export MODORDER := $(extmod-prefix)modules.order
1102
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1103

L
Linus Torvalds 已提交
1104
ifeq ($(KBUILD_EXTMOD),)
1105
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1106

1107
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
Linus Torvalds 已提交
1108
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1109
		     $(libs-y) $(libs-m)))
L
Linus Torvalds 已提交
1110

1111
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1112
		     $(patsubst %/,%,$(filter %/, $(core-) \
1113
			$(drivers-) $(libs-))))
L
Linus Torvalds 已提交
1114

1115 1116 1117
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))
L
Linus Torvalds 已提交
1118

1119
build-dirs	:= $(vmlinux-dirs)
1120
clean-dirs	:= $(vmlinux-alldirs)
1121

1122 1123 1124
# 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)))
1125
ifdef CONFIG_MODULES
1126 1127
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1128
else
1129
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1130
endif
1131
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1132

1133
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1134
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1135
# used by scripts/Makefile.package
1136
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1137

1138
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1139

1140 1141
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1142
ifdef CONFIG_TRIM_UNUSED_KSYMS
1143 1144 1145
# 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)
1146 1147 1148 1149 1150
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1151 1152
endif

1153 1154
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1155 1156 1157 1158
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1159
$(autoksyms_h):
1160
	$(call cmd,autoksyms_h)
1161

1162 1163 1164
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1165
cmd_link-vmlinux =                                                 \
1166
	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1167
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1168

1169
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1170
	+$(call if_changed,link-vmlinux)
1171

1172 1173
targets := vmlinux

1174
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1175
# make sure no implicit rule kicks in
1176
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
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1177

1178
filechk_kernel.release = \
1179 1180
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1181
# Store (new) KERNELRELEASE string in include/config/kernel.release
1182
include/config/kernel.release: FORCE
1183
	$(call filechk,kernel.release)
1184

1185 1186 1187 1188
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1189
scripts: scripts_basic scripts_dtc
1190
	$(Q)$(MAKE) $(build)=$(@)
1191

L
Linus Torvalds 已提交
1192
# Things we need to do before we recursively start building the kernel
1193 1194 1195 1196
# 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
1197

M
Masahiro Yamada 已提交
1198
PHONY += prepare archprepare
1199

1200
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1201 1202
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1203

1204
prepare0: archprepare
1205
	$(Q)$(MAKE) $(build)=scripts/mod
1206
	$(Q)$(MAKE) $(build)=.
1207

L
Linus Torvalds 已提交
1208
# All the preparing..
1209
prepare: prepare0 prepare-objtool prepare-resolve_btfids
1210

1211
# Support for using generic headers in asm-generic
1212 1213
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1214 1215
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1216 1217
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1218
uapi-asm-generic:
1219 1220
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1221

1222
PHONY += prepare-objtool prepare-resolve_btfids
1223
prepare-objtool: $(objtool_target)
1224 1225 1226 1227 1228 1229 1230 1231
ifeq ($(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
1232

1233 1234 1235 1236 1237
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
1238 1239 1240 1241 1242 1243 1244
# 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
1245 1246 1247 1248 1249
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1250
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1251
endef
L
Linus Torvalds 已提交
1252 1253

define filechk_version.h
1254
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1255
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1256
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
Linus Torvalds 已提交
1257 1258
endef

1259
$(version_h): FORCE
L
Linus Torvalds 已提交
1260
	$(call filechk,version.h)
1261
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1262

1263
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1264 1265
	$(call filechk,utsrelease.h)

1266 1267
PHONY += headerdep
headerdep:
1268 1269
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1270

1271 1272 1273
# ---------------------------------------------------------------------------
# Kernel headers

1274 1275
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1276

1277 1278 1279 1280 1281
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)
1282

1283
PHONY += headers_install
1284 1285
headers_install: headers
	$(call cmd,headers_install)
1286

1287
PHONY += archheaders archscripts
1288

1289
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1290

1291 1292
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1293
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1294
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1295 1296
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1297

1298
# Deprecated. It is no-op now.
1299
PHONY += headers_check
1300 1301
headers_check:
	@:
1302

1303
ifdef CONFIG_HEADERS_INSTALL
1304
prepare: headers
1305
endif
1306

1307 1308 1309 1310
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1311 1312 1313 1314 1315
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1316
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1317

1318 1319
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1320

1321 1322 1323
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1324 1325
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1326
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1327

1328 1329 1330 1331 1332 1333 1334 1335 1336
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1337
%.dtb: include/config/kernel.release scripts_dtc
1338 1339
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1340
PHONY += dtbs dtbs_install dtbs_check
1341
dtbs: include/config/kernel.release scripts_dtc
1342 1343
	$(Q)$(MAKE) $(build)=$(dtstree)

1344
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1345
export CHECK_DTBS=y
1346 1347 1348 1349
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1350

1351
dtbs_install:
1352
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1364 1365 1366 1367
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1368
PHONY += dt_binding_check
1369 1370 1371
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1372 1373 1374 1375 1376
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1377
# By default, build modules as well
L
Linus Torvalds 已提交
1378

1379
all: modules
L
Linus Torvalds 已提交
1380

1381 1382 1383 1384 1385 1386 1387
# 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

1388
# Build modules
T
Tejun Heo 已提交
1389
#
1390 1391 1392
# 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
1393

1394
PHONY += modules
1395
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
S
Sam Ravnborg 已提交
1396
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1397

1398 1399 1400
PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1401

1402 1403 1404 1405 1406 1407
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

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

targets += modules.order
1408

L
Linus Torvalds 已提交
1409
# Target to prepare building external modules
1410
PHONY += modules_prepare
1411
modules_prepare: prepare
1412
	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
L
Linus Torvalds 已提交
1413 1414

# Target to install modules
1415
PHONY += modules_install
L
Linus Torvalds 已提交
1416 1417
modules_install: _modinst_ _modinst_post

1418
PHONY += _modinst_
1419
_modinst_:
L
Linus Torvalds 已提交
1420 1421 1422
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1423
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1424 1425
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1426
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1427
	fi
1428
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1429 1430
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1431
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1432

1433
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1434 1435
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1436
PHONY += _modinst_post
1437
_modinst_post: _modinst_
1438
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1439

J
Josh Boyer 已提交
1440 1441 1442 1443 1444 1445
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1446 1447 1448 1449 1450
else # CONFIG_MODULES

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

1451 1452
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1453 1454 1455 1456 1457
	@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
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	@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'
1470
CLEAN_FILES += include/ksym vmlinux.symvers \
1471 1472
	       modules.builtin modules.builtin.modinfo modules.nsdeps \
	       compile_commands.json
L
Linus Torvalds 已提交
1473 1474

# Directories & files removed with 'make mrproper'
1475
MRPROPER_FILES += include/config include/generated          \
1476
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1477 1478
		  debian snap tar-install \
		  .config .config.old .version \
1479
		  Module.symvers \
1480 1481
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1482 1483
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1484

1485 1486 1487
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1488 1489 1490 1491
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1492
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1493

1494 1495
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1496
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1497 1498

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1499 1500 1501 1502

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1503
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1504

1505
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1506 1507 1508
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1509
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1510 1511 1512 1513
	$(call cmd,rmfiles)

# distclean
#
1514 1515
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1516
PHONY += distclean
L
Linus Torvalds 已提交
1517 1518

distclean: mrproper
1519
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1520
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1521
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1522 1523
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1524 1525 1526 1527 1528 1529
		-type f -print | xargs rm -f


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

1530
%src-pkg: FORCE
1531
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1532
%pkg: include/config/kernel.release FORCE
1533
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1534 1535 1536 1537

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

1538
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1539
boards := $(sort $(notdir $(boards)))
1540 1541
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1542

1543
PHONY += help
L
Linus Torvalds 已提交
1544 1545
help:
	@echo  'Cleaning targets:'
1546
	@echo  '  clean		  - Remove most generated files but keep the config and'
1547
	@echo  '                    enough build support to build external modules'
1548
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1549
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1550 1551 1552 1553 1554 1555 1556 1557
	@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'
1558
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1559
	@echo  '  dir/            - Build all files in dir and below'
1560
	@echo  '  dir/file.[ois]  - Build specified target only'
1561 1562
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1563 1564
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1565
	@echo  '  dir/file.ko     - Build module including final link'
1566
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1567 1568
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1569
	@echo  '  gtags           - Generate GNU GLOBAL index'
1570 1571 1572
	@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)'
1573
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1574
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1575
	 echo  ''
R
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	@echo  'Static analysers:'
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1577
	@echo  '  checkstack      - Generate a list of stack hogs'
1578
	@echo  '  versioncheck    - Sanity check on version.h usage'
1579
	@echo  '  includecheck    - Check for duplicate included header files'
1580
	@echo  '  export_report   - List the usages of all exported symbols'
1581
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1582
	@echo  '  coccicheck      - Check with Coccinelle'
1583 1584
	@echo  '  clang-analyzer  - Check with clang static analyzer'
	@echo  '  clang-tidy      - Check with clang-tidy'
1585
	@echo  ''
1586 1587 1588
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
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	@echo  'Kernel selftest:'
1590 1591 1592 1593 1594 1595 1596 1597 1598
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1599
	@echo  ''
1600 1601
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1602 1603 1604 1605
		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';\
1606 1607
		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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1612
	@echo  'Kernel packaging:'
1613
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
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1614 1615
	@echo  ''
	@echo  'Documentation targets:'
1616
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1617
	@echo  ''
1618
	@echo  'Architecture specific targets ($(SRCARCH)):'
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1619
	@$(if $(archhelp),$(archhelp),\
1620
		echo '  No architecture specific help defined for $(SRCARCH)')
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1621 1622 1623
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1624
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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		echo '')
1626 1627 1628 1629 1630
	@$(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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1631 1632

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1633
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1635 1636
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1637
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1638
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1639
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1640 1641 1642
	@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'
1643
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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1644 1645 1646 1647 1648
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1649 1650 1651 1652
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1653
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1654 1655 1656 1657 1658 1659 1660 1661 1662

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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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1663 1664
# Documentation targets
# ---------------------------------------------------------------------------
1665 1666
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1667
PHONY += $(DOC_TARGETS)
1668
$(DOC_TARGETS):
1669
	$(Q)$(MAKE) $(build)=Documentation $@
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1670

1671 1672 1673 1674
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1675
scripts_gdb: prepare0
1676
	$(Q)$(MAKE) $(build)=scripts/gdb
1677
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1678 1679 1680 1681 1682

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
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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1699
#                      Install the modules built in the module directory
L
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1700 1701
#                      Assumes install directory is already created

1702 1703
# We are always building only modules.
KBUILD_BUILTIN :=
L
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1704 1705
KBUILD_MODULES := 1

1706 1707
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1708
modules: $(MODORDER)
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1709
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1710

1711 1712 1713
$(MODORDER): descend
	@:

1714
PHONY += modules_install
1715
modules_install: _emodinst_ _emodinst_post
1716

1717 1718
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1719 1720
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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1721
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1722

1723
PHONY += _emodinst_post
1724 1725 1726
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1727 1728 1729
compile_commands.json: $(extmod-prefix)compile_commands.json
PHONY += compile_commands.json

1730
clean-dirs := $(KBUILD_EXTMOD)
1731 1732
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
	$(KBUILD_EXTMOD)/compile_commands.json
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1733

1734
PHONY += help
L
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1735 1736 1737 1738 1739 1740 1741 1742
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  ''
1743

1744 1745 1746
# no-op for external module builds
PHONY += prepare modules_prepare

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1747 1748
endif # KBUILD_EXTMOD

1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778
# 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
1779
single_modpost: $(single-no-ko) modules_prepare
1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	$(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

1793 1794 1795 1796
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1797 1798 1799 1800 1801 1802 1803 1804
# 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
1805
	$(Q)$(MAKE) $(build)=$@ \
1806
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1807
	need-builtin=1 need-modorder=1
1808

1809 1810 1811 1812 1813
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1814 1815
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1816
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1817
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1818 1819
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1820
		-o -name '*.dwo' -o -name '*.lst' \
1821
		-o -name '*.su' -o -name '*.mod' \
1822
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1823
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1824
		-o -name '*.asn1.[ch]' \
1825
		-o -name '*.symtypes' -o -name 'modules.order' \
1826
		-o -name '.tmp_*.o.*' \
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Emese Revfy 已提交
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		-o -name '*.c.[012]*.*' \
1828
		-o -name '*.ll' \
1829 1830
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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1831 1832
# Generate tags for editors
# ---------------------------------------------------------------------------
1833
quiet_cmd_tags = GEN     $@
1834
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
L
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1835

1836
tags TAGS cscope gtags: FORCE
L
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1837 1838
	$(call cmd,tags)

1839 1840 1841 1842
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1843
nsdeps: export KBUILD_NSDEPS=1
1844
nsdeps: modules
1845
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1846

1847 1848 1849 1850 1851 1852
# Clang Tooling
# ---------------------------------------------------------------------------

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

1853
$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1854 1855 1856 1857 1858 1859
	$(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

1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
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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1874 1875 1876
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

J
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1877
PHONY += includecheck versioncheck coccicheck export_report
P
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1878

L
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1879
includecheck:
1880
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1881
		-name '*.[hcS]' -type f -print | sort \
1882
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
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1883 1884

versioncheck:
1885
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1886
		-name '*.[hcS]' -type f -print | sort \
1887
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
Linus Torvalds 已提交
1888

1889
coccicheck:
1890
	$(Q)$(BASH) $(srctree)/scripts/$@
1891

1892 1893 1894
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1895
PHONY += checkstack kernelrelease kernelversion image_name
J
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1896

J
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1897 1898 1899 1900 1901 1902 1903 1904 1905
# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
L
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1906 1907
checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1908
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
L
Linus Torvalds 已提交
1909

1910 1911
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1912

1913
kernelversion:
1914
	@echo $(KERNELVERSION)
L
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1915

1916 1917 1918
image_name:
	@echo $(KBUILD_IMAGE)

1919
# Clear a bunch of variables before executing the submake
1920 1921 1922 1923 1924

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

1925
tools/: FORCE
1926
	$(Q)mkdir -p $(objtree)/tools
1927
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1928 1929

tools/%: FORCE
1930
	$(Q)mkdir -p $(objtree)/tools
1931
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1932

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

1936
# Run depmod only if we have System.map and depmod is executable
1937
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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Michal Marek 已提交
1938
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1939
                   $(KERNELRELEASE)
1940

1941 1942
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1943

1944
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1945

1946
endif # config-build
1947 1948
endif # mixed-build
endif # need-sub-make
L
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1949

1950
PHONY += FORCE
L
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1951
FORCE:
1952

1953
# Declare the contents of the PHONY variable as phony.  We keep that
1954
# information in a variable so we can use it in if_changed and friends.
1955
.PHONY: $(PHONY)