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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 7
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SUBLEVEL = 0
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EXTRAVERSION = -rc5
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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 := $(no-dot-config-targets) install %install \
			   kernelrelease
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
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single-build	:=
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ifneq ($(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 ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
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		config-build := 1
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                ifneq ($(words $(MAKECMDGOALS)),1)
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			mixed-build := 1
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                endif
        endif
endif
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# We cannot build single targets and the others at the same time
ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
	single-build := 1
	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
		mixed-build := 1
	endif
endif

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

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

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

PHONY += $(MAKECMDGOALS) __build_one_by_one

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$(MAKECMDGOALS): __build_one_by_one
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	@:

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

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

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

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

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

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

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

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

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# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
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LINUXINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
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		$(if $(building_out_of_srctree),-I$(srctree)/include) \
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		-I$(objtree)/include \
		$(USERINCLUDE)
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KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
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KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
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		   -Werror=implicit-function-declaration -Werror=implicit-int \
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		   -Wno-format-security \
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		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
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KBUILD_LDFLAGS_MODULE :=
export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
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KBUILD_LDFLAGS :=
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GCC_PLUGINS_CFLAGS :=
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CLANG_FLAGS :=
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export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
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export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
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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
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
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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)
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GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
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endif
ifneq ($(GCC_TOOLCHAIN),)
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CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
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endif
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ifneq ($(LLVM_IAS),1)
570
CLANG_FLAGS	+= -no-integrated-as
571
endif
572
CLANG_FLAGS	+= -Werror=unknown-warning-option
573 574
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
575
export CLANG_FLAGS
576 577
endif

578 579 580 581
# 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.
582
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
583

584
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'
592
include arch/$(SRCARCH)/Makefile
593
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
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594

595
config: outputmakefile scripts_basic FORCE
S
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

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

601
else #!config-build
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602 603 604 605
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

606
# If building an external module we do not care about the all: rule
607
# but instead __all depend on modules
608 609
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
610
__all: all
611
else
612
__all: modules
613 614 615 616 617 618 619 620 621 622
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)
623
  KBUILD_BUILTIN :=
624 625 626 627 628 629
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

630
ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
631 632 633 634 635 636 637 638 639
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

640
ifdef need-config
641 642 643
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
646
core-y		:= init/ usr/
647
drivers-y	:= drivers/ sound/
648
drivers-$(CONFIG_SAMPLES) += samples/
649
drivers-y	+= net/ virt/
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libs-y		:= lib/
endif # KBUILD_EXTMOD

653 654 655 656 657 658 659 660 661
# 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,)
662
export CFLAGS_GCOV
663

664 665 666 667 668
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

669 670 671 672 673 674 675 676 677
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

678
include arch/$(SRCARCH)/Makefile
L
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680 681
ifdef need-config
ifdef may-sync-config
682 683 684
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
685
include include/config/auto.conf.cmd
L
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687 688 689 690 691 692 693 694
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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695

696 697 698
# 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).
699 700 701
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
702
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
703
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
704
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
705
else # !may-sync-config
706 707 708
# 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
709 710 711
PHONY += include/config/auto.conf

include/config/auto.conf:
712
	$(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 ;							\
718 719
	/bin/false)

720
endif # may-sync-config
721
endif # need-config
L
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722

723
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
724
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
725 726
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
727
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
728

729 730 731 732 733 734
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
735
endif
L
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736

737 738
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
739
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
740

741
include scripts/Makefile.kcov
E
Emese Revfy 已提交
742 743
include scripts/Makefile.gcc-plugins

A
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744 745 746 747 748 749 750 751 752 753
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

754
ifneq ($(CONFIG_FRAME_WARN),0)
755
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
756 757
endif

758
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
759 760
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
761 762

KBUILD_CFLAGS += $(stackp-flags-y)
763

764
ifdef CONFIG_CC_IS_CLANG
765 766 767
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
768 769 770
# 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
771
KBUILD_CFLAGS += -mno-global-merge
772 773 774 775
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
776
KBUILD_CFLAGS += -Wno-unused-but-set-variable
777 778 779 780 781

# 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,)
782 783
endif

784
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
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785
ifdef CONFIG_FRAME_POINTER
786
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
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787
else
788 789 790 791 792 793
# 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
794
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
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795
endif
796
endif
L
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797

798 799 800 801 802
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

803
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
804

L
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805
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
806
ifdef CONFIG_DEBUG_INFO_SPLIT
807
DEBUG_CFLAGS	+= -gsplit-dwarf
A
Andi Kleen 已提交
808
else
809
DEBUG_CFLAGS	+= -g
A
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810
endif
811
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
L
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812
endif
813
ifdef CONFIG_DEBUG_INFO_DWARF4
814
DEBUG_CFLAGS	+= -gdwarf-4
815
endif
L
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816

817
ifdef CONFIG_DEBUG_INFO_REDUCED
818
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
819
		   $(call cc-option,-fno-var-tracking)
820 821
endif

822 823 824 825 826 827
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
KBUILD_AFLAGS	+= -Wa,--compress-debug-sections=zlib
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

828 829 830
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

831
ifdef CONFIG_FUNCTION_TRACER
832 833 834 835 836 837
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
838 839 840 841 842 843
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
844
endif
845
ifdef CONFIG_HAVE_FENTRY
846 847 848 849
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
850
endif
851 852 853
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
854
ifdef CONFIG_DYNAMIC_FTRACE
855
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
856 857 858 859
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
860 861
endif

862 863 864 865 866
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

867
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
868 869
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
870 871
endif

872 873 874 875
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

876
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
877
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
878

L
Linus Torvalds 已提交
879
# warn about C99 declaration after statement
880
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
881

K
Kees Cook 已提交
882
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
883
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
884

S
Sam Ravnborg 已提交
885
# disable pointer signed / unsigned warnings in gcc 4.0
886
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
887

888 889 890
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

891 892
# 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)
893
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
894
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
895

896 897 898
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

899 900 901
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

902
# disable invalid "can't wrap" optimizations for signed / pointers
903
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
904

905 906 907 908 909 910 911 912 913
# clang sets -fmerge-all-constants by default as optimization, but this
# is non-conforming behavior for C and in fact breaks the kernel, so we
# need to disable it here generally.
KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)

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

914 915 916
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

917 918 919
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

920 921 922
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

923 924 925
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

926 927 928
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

929 930 931
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

932 933 934 935 936 937
# 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

938 939
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
940
include scripts/Makefile.ubsan
941

942 943 944 945
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
946

947 948
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
R
Roland McGrath 已提交
949

950
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
951
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
952 953
endif

954 955 956 957
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
endif

958 959 960 961
# Align the bit size of userspace programs with the kernel
KBUILD_USERCFLAGS  += $(filter -m32 -m64, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))

962 963 964
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

965 966 967
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

968 969 970
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
971
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
972
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
973 974 975 976 977 978 979 980 981 982
# 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

983 984 985 986 987 988 989
#
# 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
990 991 992
#
# 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
993
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
994 995
#

996
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
997 998
export MODLIB

999
#
1000 1001 1002 1003
# 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.
1004

1005 1006
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
1007
mod_strip_cmd = $(STRIP) --strip-debug
1008
else
1009
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1010 1011
endif # INSTALL_MOD_STRIP=1
else
1012
mod_strip_cmd = true
1013 1014 1015
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1016 1017 1018 1019 1020 1021 1022
# 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
1023
    mod_compress_cmd = gzip -n -f
1024 1025
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1026
    mod_compress_cmd = xz -f
1027 1028 1029 1030
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1031
ifdef CONFIG_MODULE_SIG_ALL
1032 1033 1034
$(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
1035 1036 1037 1038 1039
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1040 1041
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1042 1043
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
1044
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1045 1046 1047 1048 1049 1050 1051 1052
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1053
PHONY += prepare0
1054

1055
export MODORDER := $(extmod-prefix)modules.order
1056
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1057

L
Linus Torvalds 已提交
1058
ifeq ($(KBUILD_EXTMOD),)
1059
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1060

1061
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
Linus Torvalds 已提交
1062
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1063
		     $(libs-y) $(libs-m)))
L
Linus Torvalds 已提交
1064

1065
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1066
		     $(patsubst %/,%,$(filter %/, $(core-) \
1067
			$(drivers-) $(libs-))))
L
Linus Torvalds 已提交
1068

1069 1070 1071 1072
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))

1073
build-dirs	:= $(vmlinux-dirs)
1074
clean-dirs	:= $(vmlinux-alldirs)
1075

1076 1077 1078
# 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)))
1079
ifdef CONFIG_MODULES
1080 1081
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1082
else
1083
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1084
endif
1085
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1086

1087
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1088
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1089
export LDFLAGS_vmlinux
1090
# used by scripts/Makefile.package
1091
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1092

1093
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1094

1095 1096
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1097
ifdef CONFIG_TRIM_UNUSED_KSYMS
1098 1099 1100
# 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)
1101 1102 1103 1104 1105
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1106 1107
endif

1108 1109
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1110 1111 1112 1113
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1114
$(autoksyms_h):
1115
	$(call cmd,autoksyms_h)
1116

1117 1118 1119
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1120
cmd_link-vmlinux =                                                 \
1121
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1122
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1123

1124
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1125
	+$(call if_changed,link-vmlinux)
1126

1127 1128
targets := vmlinux

1129
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1130
# make sure no implicit rule kicks in
1131
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
Linus Torvalds 已提交
1132

1133
filechk_kernel.release = \
1134 1135
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1136
# Store (new) KERNELRELEASE string in include/config/kernel.release
1137
include/config/kernel.release: FORCE
1138
	$(call filechk,kernel.release)
1139

1140 1141 1142 1143
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1144
scripts: scripts_basic scripts_dtc
1145
	$(Q)$(MAKE) $(build)=$(@)
1146

L
Linus Torvalds 已提交
1147
# Things we need to do before we recursively start building the kernel
1148 1149 1150 1151
# 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
1152

M
Masahiro Yamada 已提交
1153
PHONY += prepare archprepare
1154

1155
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1156 1157
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1158

1159
prepare0: archprepare
1160
	$(Q)$(MAKE) $(build)=scripts/mod
1161
	$(Q)$(MAKE) $(build)=.
1162

L
Linus Torvalds 已提交
1163
# All the preparing..
1164 1165
prepare: prepare0 prepare-objtool

1166
# Support for using generic headers in asm-generic
1167 1168
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1169 1170
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1171 1172
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1173
uapi-asm-generic:
1174 1175
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1176

1177
PHONY += prepare-objtool
1178
prepare-objtool: $(objtool_target)
1179 1180 1181 1182 1183 1184 1185 1186
ifeq ($(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
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1187 1188 1189 1190 1191 1192 1193 1194

# 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
1195 1196 1197 1198 1199
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1200
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
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1201
endef
L
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1202 1203

define filechk_version.h
1204
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1205
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1206
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
Linus Torvalds 已提交
1207 1208
endef

1209
$(version_h): FORCE
L
Linus Torvalds 已提交
1210
	$(call filechk,version.h)
1211
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1212

1213
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1214 1215
	$(call filechk,utsrelease.h)

1216 1217
PHONY += headerdep
headerdep:
1218 1219
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1220

1221 1222 1223
# ---------------------------------------------------------------------------
# Kernel headers

1224 1225
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1226

1227 1228 1229 1230 1231
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)
1232

1233
PHONY += headers_install
1234 1235
headers_install: headers
	$(call cmd,headers_install)
1236

1237
PHONY += archheaders archscripts
1238

1239
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1240

1241 1242
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1243
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1244
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1245 1246
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1247

1248
# Deprecated. It is no-op now.
1249
PHONY += headers_check
1250 1251
headers_check:
	@:
1252

1253
ifdef CONFIG_HEADERS_INSTALL
1254
prepare: headers
1255
endif
1256

1257 1258 1259 1260
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1261 1262 1263 1264 1265
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1266
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1267

1268 1269
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1270

1271 1272 1273
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1274 1275
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1276
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1277

1278 1279 1280 1281 1282 1283 1284 1285 1286
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1287
%.dtb: include/config/kernel.release scripts_dtc
1288 1289
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1290
PHONY += dtbs dtbs_install dtbs_check
1291
dtbs: include/config/kernel.release scripts_dtc
1292 1293
	$(Q)$(MAKE) $(build)=$(dtstree)

1294
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1295
export CHECK_DTBS=y
1296 1297 1298 1299
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1300

1301
dtbs_install:
1302
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1314 1315 1316 1317
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1318
PHONY += dt_binding_check
1319 1320 1321
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1322 1323 1324
# ---------------------------------------------------------------------------
# Modules

1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
# install modules.builtin regardless of CONFIG_MODULES
PHONY += _builtin_inst_
_builtin_inst_:
	@mkdir -p $(MODLIB)/
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/

PHONY += install
install: _builtin_inst_

L
Linus Torvalds 已提交
1335 1336
ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1337
# By default, build modules as well
L
Linus Torvalds 已提交
1338

1339
all: modules
L
Linus Torvalds 已提交
1340

1341 1342 1343 1344 1345 1346 1347
# 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

1348
# Build modules
T
Tejun Heo 已提交
1349
#
1350 1351 1352
# 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
1353

1354
PHONY += modules
1355
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
S
Sam Ravnborg 已提交
1356
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1357 1358 1359 1360

PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1361

1362 1363 1364 1365 1366 1367
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

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

targets += modules.order
1368

L
Linus Torvalds 已提交
1369
# Target to prepare building external modules
1370
PHONY += modules_prepare
1371
modules_prepare: prepare
L
Linus Torvalds 已提交
1372 1373

# Target to install modules
1374
PHONY += modules_install
L
Linus Torvalds 已提交
1375 1376
modules_install: _modinst_ _modinst_post

1377
PHONY += _modinst_
1378
_modinst_: _builtin_inst_
L
Linus Torvalds 已提交
1379 1380 1381
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1382
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1383 1384
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1385
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1386
	fi
1387
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
S
Sam Ravnborg 已提交
1388
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1389

1390
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1391 1392
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1393
PHONY += _modinst_post
1394
_modinst_post: _modinst_
1395
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1396

J
Josh Boyer 已提交
1397 1398 1399 1400 1401 1402
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1403 1404 1405 1406 1407
else # CONFIG_MODULES

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

1408 1409
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1410 1411 1412 1413 1414
	@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
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
	@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'
1427
CLEAN_FILES += include/ksym vmlinux.symvers \
1428
	       modules.builtin modules.builtin.modinfo modules.nsdeps
L
Linus Torvalds 已提交
1429 1430

# Directories & files removed with 'make mrproper'
1431
MRPROPER_FILES += include/config include/generated          \
1432
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1433 1434
		  debian snap tar-install \
		  .config .config.old .version \
1435
		  Module.symvers \
1436 1437
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1438 1439
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1440

1441 1442 1443
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1444 1445 1446 1447
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1448
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1449

1450 1451
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1452
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1453 1454

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1455 1456 1457 1458

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1459
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1460

1461
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1462 1463 1464
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1465
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1466 1467 1468 1469
	$(call cmd,rmfiles)

# distclean
#
1470 1471
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1472
PHONY += distclean
L
Linus Torvalds 已提交
1473 1474

distclean: mrproper
1475
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1476
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1477
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1478 1479
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1480 1481 1482 1483 1484 1485
		-type f -print | xargs rm -f


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

1486
%src-pkg: FORCE
1487
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1488
%pkg: include/config/kernel.release FORCE
1489
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1490 1491 1492 1493

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

1494
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1495
boards := $(sort $(notdir $(boards)))
1496 1497
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1498

1499
PHONY += help
L
Linus Torvalds 已提交
1500 1501
help:
	@echo  'Cleaning targets:'
1502
	@echo  '  clean		  - Remove most generated files but keep the config and'
1503
	@echo  '                    enough build support to build external modules'
1504
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1505
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1506 1507 1508 1509 1510 1511 1512 1513
	@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'
1514
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1515
	@echo  '  dir/            - Build all files in dir and below'
1516
	@echo  '  dir/file.[ois]  - Build specified target only'
1517 1518
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1519 1520
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1521
	@echo  '  dir/file.ko     - Build module including final link'
1522
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1523 1524
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1525
	@echo  '  gtags           - Generate GNU GLOBAL index'
1526 1527 1528
	@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)'
1529
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1530
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1531
	 echo  ''
R
Randy Dunlap 已提交
1532
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1533 1534
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1535
	@echo  '  versioncheck    - Sanity check on version.h usage'
1536
	@echo  '  includecheck    - Check for duplicate included header files'
1537
	@echo  '  export_report   - List the usages of all exported symbols'
1538
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1539
	@echo  '  coccicheck      - Check with Coccinelle'
1540
	@echo  ''
1541 1542 1543
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
R
Randy Dunlap 已提交
1544
	@echo  'Kernel selftest:'
1545 1546 1547 1548 1549 1550 1551 1552 1553
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1554
	@echo  ''
1555 1556
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1557 1558 1559 1560
		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';\
1561 1562
		echo '')

R
Randy Dunlap 已提交
1563 1564 1565 1566
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
Linus Torvalds 已提交
1567
	@echo  'Kernel packaging:'
1568
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
L
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	@echo  ''
	@echo  'Documentation targets:'
1571
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
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	@echo  ''
1573
	@echo  'Architecture specific targets ($(SRCARCH)):'
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	@$(if $(archhelp),$(archhelp),\
1575
		echo '  No architecture specific help defined for $(SRCARCH)')
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	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1579
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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		echo '')
1581 1582 1583 1584 1585
	@$(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'
1588
	@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'
1590 1591
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1592
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1593
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1594
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1595 1596 1597
	@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'
1598
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1604 1605 1606 1607
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1608
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1609 1610 1611 1612 1613 1614 1615 1616 1617

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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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# Documentation targets
# ---------------------------------------------------------------------------
1620 1621
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1622
PHONY += $(DOC_TARGETS)
1623
$(DOC_TARGETS):
1624
	$(Q)$(MAKE) $(build)=Documentation $@
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1625

1626 1627 1628 1629
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1630
scripts_gdb: prepare0
1631
	$(Q)$(MAKE) $(build)=scripts/gdb
1632
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1633 1634 1635 1636 1637

ifdef CONFIG_GDB_SCRIPTS
all: scripts_gdb
endif

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else # KBUILD_EXTMOD

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

# We are always building modules
KBUILD_MODULES := 1

1660 1661
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1662
modules: descend
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1663
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1664

1665
PHONY += modules_install
1666
modules_install: _emodinst_ _emodinst_post
1667

1668 1669
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1670 1671
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1673

1674
PHONY += _emodinst_post
1675 1676 1677
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1678
clean-dirs := $(KBUILD_EXTMOD)
1679
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
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1681
PHONY += help
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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  ''
1690

1691
PHONY += prepare
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endif # KBUILD_EXTMOD

1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
# 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
single_modpost: $(single-no-ko)
	$(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

1738 1739 1740 1741
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1742 1743 1744 1745 1746 1747 1748 1749
# 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
1750
	$(Q)$(MAKE) $(build)=$@ \
1751
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1752
	need-builtin=1 need-modorder=1
1753

1754 1755 1756 1757 1758
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1759 1760
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1761
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1762
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1763 1764
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1765
		-o -name '*.dwo' -o -name '*.lst' \
1766
		-o -name '*.su' -o -name '*.mod' \
1767
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1768
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1769
		-o -name '*.asn1.[ch]' \
1770
		-o -name '*.symtypes' -o -name 'modules.order' \
1771
		-o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1773
		-o -name '*.ll' \
1774 1775
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1778
quiet_cmd_tags = GEN     $@
1779
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
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1781
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

1784 1785 1786 1787
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1788
nsdeps: export KBUILD_NSDEPS=1
1789
nsdeps: modules
1790
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1791

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

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PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1798
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1800
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1803
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1805
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1806

1807
coccicheck:
1808
	$(Q)$(BASH) $(srctree)/scripts/$@
1809

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1810 1811 1812
namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1813 1814 1815
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1816
PHONY += checkstack kernelrelease kernelversion image_name
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1818 1819 1820 1821 1822 1823 1824 1825 1826
# 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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checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1829
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1830

1831 1832
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1833

1834
kernelversion:
1835
	@echo $(KERNELVERSION)
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1837 1838 1839
image_name:
	@echo $(KBUILD_IMAGE)

1840
# Clear a bunch of variables before executing the submake
1841 1842 1843 1844 1845

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

1846
tools/: FORCE
1847
	$(Q)mkdir -p $(objtree)/tools
1848
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1849 1850

tools/%: FORCE
1851
	$(Q)mkdir -p $(objtree)/tools
1852
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1853

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quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1855
      cmd_rmfiles = rm -rf $(rm-files)
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1856

1857
# Run depmod only if we have System.map and depmod is executable
1858
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
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1859
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1860
                   $(KERNELRELEASE)
1861

1862 1863
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1864

1865
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1866

1867
endif # config-build
1868 1869
endif # mixed-build
endif # need-sub-make
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1870

1871
PHONY += FORCE
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1872
FORCE:
1873

1874
# Declare the contents of the PHONY variable as phony.  We keep that
1875
# information in a variable so we can use it in if_changed and friends.
1876
.PHONY: $(PHONY)