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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 8
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SUBLEVEL = 0
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EXTRAVERSION = -rc2
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NAME = Kleptomaniac Octopus
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# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

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

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

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

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

# Avoid interference with shell env settings
unexport GREP_OPTIONS

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

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

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

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

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

export quiet Q KBUILD_VERBOSE

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

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

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

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

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

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

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

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export abs_srctree abs_objtree
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export sub_make_done := 1

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

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

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

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

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

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export KBUILD_CHECKSRC KBUILD_EXTMOD

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

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

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

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clean-targets := %clean mrproper cleandocs
no-dot-config-targets := $(clean-targets) \
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			 cscope gtags TAGS tags help% %docs check% coccicheck \
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			 $(version_h) headers headers_% archheaders archscripts \
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			 %asm-generic kernelversion %src-pkg dt_binding_check \
			 outputmakefile
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no-sync-config-targets := $(no-dot-config-targets) install %install \
			   kernelrelease
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build	:=
mixed-build	:=
need-config	:= 1
may-sync-config	:= 1
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single-build	:=
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ifneq ($(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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KGZIP		= gzip
KBZIP2		= bzip2
KLZOP		= lzop
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LZMA		= lzma
LZ4		= lz4c
XZ		= xz

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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 KGZIP KBZIP2 KLZOP LZMA LZ4 XZ
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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 CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
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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)
571
GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
572 573
endif
ifneq ($(GCC_TOOLCHAIN),)
574
CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
575
endif
576
ifneq ($(LLVM_IAS),1)
577
CLANG_FLAGS	+= -no-integrated-as
578
endif
579
CLANG_FLAGS	+= -Werror=unknown-warning-option
580 581
KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
582
export CLANG_FLAGS
583 584
endif

585 586 587 588
# 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.
589
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
590

591
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'
599
include arch/$(SRCARCH)/Makefile
600
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
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601

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

605
%config: outputmakefile scripts_basic FORCE
L
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

608
else #!config-build
L
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# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

613
# If building an external module we do not care about the all: rule
614
# but instead __all depend on modules
615 616
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
617
__all: all
618
else
619
__all: modules
620 621 622 623 624 625 626 627 628 629
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)
630
  KBUILD_BUILTIN :=
631 632 633 634 635 636
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

637
ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
638 639 640 641 642 643 644 645 646
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

647
ifdef need-config
648 649 650
include include/config/auto.conf
endif

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

660 661 662 663 664 665 666 667 668
# 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,)
669
export CFLAGS_GCOV
670

671 672 673 674 675
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

676 677 678 679 680 681 682 683 684
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

685
include arch/$(SRCARCH)/Makefile
L
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687 688
ifdef need-config
ifdef may-sync-config
689 690 691
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
692
include include/config/auto.conf.cmd
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694 695 696 697 698 699 700 701
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" not found!'
	@echo >&2 '***'
	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
	@echo >&2 '*** "make menuconfig" or "make xconfig").'
	@echo >&2 '***'
	@/bin/false
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702

703 704 705
# 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).
706 707 708
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
709
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
710
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
711
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
712
else # !may-sync-config
713 714 715
# 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
716 717 718
PHONY += include/config/auto.conf

include/config/auto.conf:
719
	$(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 ;							\
725 726
	/bin/false)

727
endif # may-sync-config
728
endif # need-config
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729

730
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
731
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
732 733
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
734
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
735

736 737 738 739 740 741
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
742
endif
L
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743

744 745
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
746
KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
747

748
include scripts/Makefile.kcov
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749 750
include scripts/Makefile.gcc-plugins

A
Andi Kleen 已提交
751 752 753 754 755 756 757 758 759 760
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                 $(call cc-option,-fno-ipa-cp-clone,) \
                 $(call cc-option,-fno-partial-inlining)
endif

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

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

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

771
ifdef CONFIG_CC_IS_CLANG
772 773 774
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
775 776 777
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
778
KBUILD_CFLAGS += -mno-global-merge
779 780 781 782
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
783
KBUILD_CFLAGS += -Wno-unused-but-set-variable
784 785 786 787 788

# 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,)
789 790
endif

791
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
L
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792
ifdef CONFIG_FRAME_POINTER
793
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
L
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794
else
795 796 797 798 799 800
# Some targets (ARM with Thumb2, for example), can't be built with frame
# pointers.  For those, we don't have FUNCTION_TRACER automatically
# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
# -fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER
801
KBUILD_CFLAGS	+= -fomit-frame-pointer
L
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802
endif
803
endif
L
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804

805 806 807 808 809
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

810
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
811

L
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812
ifdef CONFIG_DEBUG_INFO
A
Andi Kleen 已提交
813
ifdef CONFIG_DEBUG_INFO_SPLIT
814
DEBUG_CFLAGS	+= -gsplit-dwarf
A
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815
else
816
DEBUG_CFLAGS	+= -g
A
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817
endif
818
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
L
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819
endif
820
ifdef CONFIG_DEBUG_INFO_DWARF4
821
DEBUG_CFLAGS	+= -gdwarf-4
822
endif
L
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823

824
ifdef CONFIG_DEBUG_INFO_REDUCED
825
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
826
		   $(call cc-option,-fno-var-tracking)
827 828
endif

829 830
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS	+= -gz=zlib
831
KBUILD_AFLAGS	+= -gz=zlib
832 833 834
KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
endif

835 836 837
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

838
ifdef CONFIG_FUNCTION_TRACER
839 840 841 842 843 844
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
845 846 847 848 849 850
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
851
endif
852
ifdef CONFIG_HAVE_FENTRY
853 854 855 856
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
857
endif
858 859 860
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
861
ifdef CONFIG_DYNAMIC_FTRACE
862
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
863 864 865 866
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
867 868
endif

869 870 871 872 873
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

874
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
875 876
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
877 878
endif

879 880 881 882
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

883 884 885 886 887 888
ifdef CONFIG_SHADOW_CALL_STACK
CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
export CC_FLAGS_SCS
endif

889
# arch Makefile may override CC so keep this after arch Makefile is included
M
Masahiro Yamada 已提交
890
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
891

L
Linus Torvalds 已提交
892
# warn about C99 declaration after statement
893
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
Linus Torvalds 已提交
894

K
Kees Cook 已提交
895
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
896
KBUILD_CFLAGS += -Wvla
K
Kees Cook 已提交
897

S
Sam Ravnborg 已提交
898
# disable pointer signed / unsigned warnings in gcc 4.0
899
KBUILD_CFLAGS += -Wno-pointer-sign
L
Linus Torvalds 已提交
900

901 902 903
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

904 905
# 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)
906
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
907
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
908

909 910 911
# Another good warning that we'll want to enable eventually
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)

912 913 914
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)

915
# disable invalid "can't wrap" optimizations for signed / pointers
916
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
917

918 919 920 921 922 923 924 925 926
# 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)

927 928 929
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

930 931 932
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

933 934 935
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

936 937 938
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

939 940 941
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

942 943 944
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

945 946 947 948 949 950
# 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

951 952
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
953
include scripts/Makefile.ubsan
954
include scripts/Makefile.kcsan
955

956 957 958 959
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
960

961 962
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
R
Roland McGrath 已提交
963

964
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
965
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
966 967
endif

968 969 970 971
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
endif

972 973 974 975
# Align the bit size of userspace programs with the kernel
KBUILD_USERCFLAGS  += $(filter -m32 -m64, $(KBUILD_CFLAGS))
KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))

976 977 978
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)

979 980 981
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

982 983 984
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
985
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
986
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
987 988 989 990 991 992 993 994 995 996
# 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

997 998 999 1000 1001 1002 1003
#
# 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
1004 1005 1006
#
# 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
1007
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
1008 1009
#

1010
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
Linus Torvalds 已提交
1011 1012
export MODLIB

1013
#
1014 1015 1016 1017
# 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.
1018

1019 1020
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
1021
mod_strip_cmd = $(STRIP) --strip-debug
1022
else
1023
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1024 1025
endif # INSTALL_MOD_STRIP=1
else
1026
mod_strip_cmd = true
1027 1028 1029
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

1030 1031 1032 1033 1034 1035 1036
# 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
1037
    mod_compress_cmd = $(KGZIP) -n -f
1038 1039
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1040
    mod_compress_cmd = $(XZ) -f
1041 1042 1043 1044
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1045
ifdef CONFIG_MODULE_SIG_ALL
1046 1047 1048
$(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
1049 1050 1051 1052 1053
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1054 1055
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1056 1057 1058
has_libelf = $(call try-run,\
               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)

1059 1060 1061 1062 1063 1064 1065 1066 1067
ifdef CONFIG_STACK_VALIDATION
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1068 1069 1070 1071 1072 1073 1074 1075
ifdef CONFIG_DEBUG_INFO_BTF
  ifeq ($(has_libelf),1)
    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
  else
    ERROR_RESOLVE_BTFIDS := 1
  endif
endif

1076
PHONY += prepare0
1077

1078
export MODORDER := $(extmod-prefix)modules.order
1079
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1080

L
Linus Torvalds 已提交
1081
ifeq ($(KBUILD_EXTMOD),)
1082
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
1083

1084
vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
L
Linus Torvalds 已提交
1085
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1086
		     $(libs-y) $(libs-m)))
L
Linus Torvalds 已提交
1087

1088
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1089
		     $(patsubst %/,%,$(filter %/, $(core-) \
1090
			$(drivers-) $(libs-))))
L
Linus Torvalds 已提交
1091

1092 1093 1094
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
			$(core-y) $(core-m) $(libs-y) $(libs-m) \
			$(drivers-y) $(drivers-m)))
L
Linus Torvalds 已提交
1095

1096
build-dirs	:= $(vmlinux-dirs)
1097
clean-dirs	:= $(vmlinux-alldirs)
1098

1099 1100 1101
# 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)))
1102
ifdef CONFIG_MODULES
1103 1104
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1105
else
1106
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1107
endif
1108
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
L
Linus Torvalds 已提交
1109

1110
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1111
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1112
export LDFLAGS_vmlinux
1113
# used by scripts/Makefile.package
1114
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1115

1116
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1117

1118 1119
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1120
ifdef CONFIG_TRIM_UNUSED_KSYMS
1121 1122 1123
# 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)
1124 1125 1126 1127 1128
KBUILD_MODULES := 1

autoksyms_recursive: descend modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1129 1130
endif

1131 1132
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

1133 1134 1135 1136
quiet_cmd_autoksyms_h = GEN     $@
      cmd_autoksyms_h = mkdir -p $(dir $@); \
			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@

1137
$(autoksyms_h):
1138
	$(call cmd,autoksyms_h)
1139

1140 1141 1142
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1143
cmd_link-vmlinux =                                                 \
1144
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1145
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1146

1147
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1148
	+$(call if_changed,link-vmlinux)
1149

1150 1151
targets := vmlinux

1152
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1153
# make sure no implicit rule kicks in
1154
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
L
Linus Torvalds 已提交
1155

1156
filechk_kernel.release = \
1157 1158
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1159
# Store (new) KERNELRELEASE string in include/config/kernel.release
1160
include/config/kernel.release: FORCE
1161
	$(call filechk,kernel.release)
1162

1163 1164 1165 1166
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1167
scripts: scripts_basic scripts_dtc
1168
	$(Q)$(MAKE) $(build)=$(@)
1169

L
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1170
# Things we need to do before we recursively start building the kernel
1171 1172 1173 1174
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
L
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1175

M
Masahiro Yamada 已提交
1176
PHONY += prepare archprepare
1177

1178
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1179 1180
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
	include/generated/autoconf.h
1181

1182
prepare0: archprepare
1183
	$(Q)$(MAKE) $(build)=scripts/mod
1184
	$(Q)$(MAKE) $(build)=.
1185

L
Linus Torvalds 已提交
1186
# All the preparing..
1187
prepare: prepare0 prepare-objtool prepare-resolve_btfids
1188

1189
# Support for using generic headers in asm-generic
1190 1191
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1192 1193
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1194 1195
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1196
uapi-asm-generic:
1197 1198
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1199

1200
PHONY += prepare-objtool prepare-resolve_btfids
1201
prepare-objtool: $(objtool_target)
1202 1203 1204 1205 1206 1207 1208 1209
ifeq ($(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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1211 1212 1213 1214 1215
prepare-resolve_btfids: $(resolve_btfids_target)
ifeq ($(ERROR_RESOLVE_BTFIDS),1)
	@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
	@false
endif
L
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1216 1217 1218 1219 1220 1221 1222
# 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
1223 1224 1225 1226 1227
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1228
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
Sam Ravnborg 已提交
1229
endef
L
Linus Torvalds 已提交
1230 1231

define filechk_version.h
1232
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1233
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1234
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
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1235 1236
endef

1237
$(version_h): FORCE
L
Linus Torvalds 已提交
1238
	$(call filechk,version.h)
1239
	$(Q)rm -f $(old_version_h)
L
Linus Torvalds 已提交
1240

1241
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1242 1243
	$(call filechk,utsrelease.h)

1244 1245
PHONY += headerdep
headerdep:
1246 1247
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1248

1249 1250 1251
# ---------------------------------------------------------------------------
# Kernel headers

1252 1253
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1254

1255 1256 1257 1258 1259
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)
1260

1261
PHONY += headers_install
1262 1263
headers_install: headers
	$(call cmd,headers_install)
1264

1265
PHONY += archheaders archscripts
1266

1267
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1268

1269 1270
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1271
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1272
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1273 1274
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1275

1276
# Deprecated. It is no-op now.
1277
PHONY += headers_check
1278 1279
headers_check:
	@:
1280

1281
ifdef CONFIG_HEADERS_INSTALL
1282
prepare: headers
1283
endif
1284

1285 1286 1287 1288
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1289 1290 1291 1292 1293
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1294
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1295

1296 1297
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
W
Wang Long 已提交
1298

1299 1300 1301
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1302 1303
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1304
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1305

1306 1307 1308 1309 1310 1311 1312 1313 1314
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1315
%.dtb: include/config/kernel.release scripts_dtc
1316 1317
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1318
PHONY += dtbs dtbs_install dtbs_check
1319
dtbs: include/config/kernel.release scripts_dtc
1320 1321
	$(Q)$(MAKE) $(build)=$(dtstree)

1322
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1323
export CHECK_DTBS=y
1324 1325 1326 1327
dtbs: dt_binding_check
endif

dtbs_check: dtbs
1328

1329
dtbs_install:
1330
	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1342 1343 1344 1345
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
export CHECK_DT_BINDING=y
endif

1346
PHONY += dt_binding_check
1347 1348 1349
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

L
Linus Torvalds 已提交
1350 1351 1352 1353 1354
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

S
Sam Ravnborg 已提交
1355
# By default, build modules as well
L
Linus Torvalds 已提交
1356

1357
all: modules
L
Linus Torvalds 已提交
1358

1359 1360 1361 1362 1363 1364 1365
# 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

1366
# Build modules
T
Tejun Heo 已提交
1367
#
1368 1369 1370
# 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
1371

1372
PHONY += modules
1373
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
S
Sam Ravnborg 已提交
1374
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
Linus Torvalds 已提交
1375

1376 1377 1378
PHONY += modules_check
modules_check: modules.order
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
L
Linus Torvalds 已提交
1379

1380 1381 1382 1383 1384 1385
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@

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

targets += modules.order
1386

L
Linus Torvalds 已提交
1387
# Target to prepare building external modules
1388
PHONY += modules_prepare
1389
modules_prepare: prepare
L
Linus Torvalds 已提交
1390 1391

# Target to install modules
1392
PHONY += modules_install
L
Linus Torvalds 已提交
1393 1394
modules_install: _modinst_ _modinst_post

1395
PHONY += _modinst_
1396
_modinst_:
L
Linus Torvalds 已提交
1397 1398 1399
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1400
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
Linus Torvalds 已提交
1401 1402
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1403
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1404
	fi
1405
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1406 1407
	@cp -f modules.builtin $(MODLIB)/
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1408
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1409

1410
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1411 1412
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1413
PHONY += _modinst_post
1414
_modinst_post: _modinst_
1415
	$(call cmd,depmod)
L
Linus Torvalds 已提交
1416

J
Josh Boyer 已提交
1417 1418 1419 1420 1421 1422
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
Linus Torvalds 已提交
1423 1424 1425 1426 1427
else # CONFIG_MODULES

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

1428 1429
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1430 1431 1432 1433 1434
	@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
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	@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'
1447
CLEAN_FILES += include/ksym vmlinux.symvers \
1448
	       modules.builtin modules.builtin.modinfo modules.nsdeps
L
Linus Torvalds 已提交
1449 1450

# Directories & files removed with 'make mrproper'
1451
MRPROPER_FILES += include/config include/generated          \
1452
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1453 1454
		  debian snap tar-install \
		  .config .config.old .version \
1455
		  Module.symvers \
1456 1457
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1458 1459
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1460

1461 1462 1463
# Directories & files removed with 'make distclean'
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1464 1465 1466 1467
# clean - Delete most, but leave enough to build external modules
#
clean: rm-files := $(CLEAN_FILES)

1468
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1469

1470 1471
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1472
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1473 1474

clean: archclean vmlinuxclean
L
Linus Torvalds 已提交
1475 1476 1477 1478

# mrproper - Delete all generated files, including .config
#
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1479
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
Linus Torvalds 已提交
1480

1481
PHONY += $(mrproper-dirs) mrproper
L
Linus Torvalds 已提交
1482 1483 1484
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1485
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1486 1487 1488 1489
	$(call cmd,rmfiles)

# distclean
#
1490 1491
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1492
PHONY += distclean
L
Linus Torvalds 已提交
1493 1494

distclean: mrproper
1495
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1496
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1497
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1498 1499
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504 1505
		-type f -print | xargs rm -f


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

1506
%src-pkg: FORCE
1507
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1508
%pkg: include/config/kernel.release FORCE
1509
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
Linus Torvalds 已提交
1510 1511 1512 1513

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

1514
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1515
boards := $(sort $(notdir $(boards)))
1516 1517
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1518

1519
PHONY += help
L
Linus Torvalds 已提交
1520 1521
help:
	@echo  'Cleaning targets:'
1522
	@echo  '  clean		  - Remove most generated files but keep the config and'
1523
	@echo  '                    enough build support to build external modules'
1524
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1525
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
Linus Torvalds 已提交
1526 1527 1528 1529 1530 1531 1532 1533
	@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'
1534
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1535
	@echo  '  dir/            - Build all files in dir and below'
1536
	@echo  '  dir/file.[ois]  - Build specified target only'
1537 1538
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1539 1540
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1541
	@echo  '  dir/file.ko     - Build module including final link'
1542
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1543 1544
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1545
	@echo  '  gtags           - Generate GNU GLOBAL index'
1546 1547 1548
	@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)'
1549
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1550
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1551
	 echo  ''
R
Randy Dunlap 已提交
1552
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1553 1554
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1555
	@echo  '  versioncheck    - Sanity check on version.h usage'
1556
	@echo  '  includecheck    - Check for duplicate included header files'
1557
	@echo  '  export_report   - List the usages of all exported symbols'
1558
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1559
	@echo  '  coccicheck      - Check with Coccinelle'
1560
	@echo  ''
1561 1562 1563
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
R
Randy Dunlap 已提交
1564
	@echo  'Kernel selftest:'
1565 1566 1567 1568 1569 1570 1571 1572 1573
	@echo  '  kselftest         - Build and run kernel selftest'
	@echo  '                      Build, install, and boot kernel before'
	@echo  '                      running kselftest on it'
	@echo  '                      Run as root for full coverage'
	@echo  '  kselftest-all     - Build kernel selftest'
	@echo  '  kselftest-install - Build and install kernel selftest'
	@echo  '  kselftest-clean   - Remove all generated kselftest files'
	@echo  '  kselftest-merge   - Merge all the config dependencies of'
	@echo  '		      kselftest to existing .config.'
1574
	@echo  ''
1575 1576
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1577 1578 1579 1580
		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';\
1581 1582
		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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1587
	@echo  'Kernel packaging:'
1588
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
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1589 1590
	@echo  ''
	@echo  'Documentation targets:'
1591
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
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1592
	@echo  ''
1593
	@echo  'Architecture specific targets ($(SRCARCH)):'
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	@$(if $(archhelp),$(archhelp),\
1595
		echo '  No architecture specific help defined for $(SRCARCH)')
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1596 1597 1598
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
1599
		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
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		echo '')
1601 1602 1603 1604 1605
	@$(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'
1608
	@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'
1610 1611
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
	@echo  '                       (sparse by default)'
1612
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1613
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1614
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1615 1616 1617
	@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'
1618
	@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'


1624 1625 1626 1627
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1628
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1629 1630 1631 1632 1633 1634 1635 1636 1637

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1640 1641
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1642
PHONY += $(DOC_TARGETS)
1643
$(DOC_TARGETS):
1644
	$(Q)$(MAKE) $(build)=Documentation $@
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1645

1646 1647 1648 1649
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1650
scripts_gdb: prepare0
1651
	$(Q)$(MAKE) $(build)=scripts/gdb
1652
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1653 1654 1655 1656 1657

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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1675 1676 1677 1678 1679
#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1

1680 1681
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
1682
modules: descend
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1683
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1684

1685
PHONY += modules_install
1686
modules_install: _emodinst_ _emodinst_post
1687

1688 1689
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1690 1691
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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1692
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1693

1694
PHONY += _emodinst_post
1695 1696 1697
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1698
clean-dirs := $(KBUILD_EXTMOD)
1699
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
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1700

1701
PHONY += help
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1702 1703 1704 1705 1706 1707 1708 1709
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  ''
1710

1711
PHONY += prepare
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1712 1713
endif # KBUILD_EXTMOD

1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
# 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

1758 1759 1760 1761
ifndef CONFIG_MODULES
KBUILD_MODULES :=
endif

1762 1763 1764 1765 1766 1767 1768 1769
# 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
1770
	$(Q)$(MAKE) $(build)=$@ \
1771
	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1772
	need-builtin=1 need-modorder=1
1773

1774 1775 1776 1777 1778
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1779 1780
clean: $(clean-dirs)
	$(call cmd,rmfiles)
1781
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1782
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1783 1784
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1785
		-o -name '*.dwo' -o -name '*.lst' \
1786
		-o -name '*.su' -o -name '*.mod' \
1787
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1788
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1789
		-o -name '*.asn1.[ch]' \
1790
		-o -name '*.symtypes' -o -name 'modules.order' \
1791
		-o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1793
		-o -name '*.ll' \
1794 1795
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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1796 1797
# Generate tags for editors
# ---------------------------------------------------------------------------
1798
quiet_cmd_tags = GEN     $@
1799
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
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1801
tags TAGS cscope gtags: FORCE
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1802 1803
	$(call cmd,tags)

1804 1805 1806 1807
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps
1808
nsdeps: export KBUILD_NSDEPS=1
1809
nsdeps: modules
1810
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1811

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1812 1813 1814
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

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1815 1816
PHONY += includecheck versioncheck coccicheck namespacecheck export_report

L
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1817
includecheck:
1818
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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1819
		-name '*.[hcS]' -type f -print | sort \
1820
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
L
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1821 1822

versioncheck:
1823
	find $(srctree)/* $(RCS_FIND_IGNORE) \
L
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1824
		-name '*.[hcS]' -type f -print | sort \
1825
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
L
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1826

1827
coccicheck:
1828
	$(Q)$(BASH) $(srctree)/scripts/$@
1829

L
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1830 1831 1832
namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1833 1834 1835
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1836
PHONY += checkstack kernelrelease kernelversion image_name
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1837

J
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1838 1839 1840 1841 1842 1843 1844 1845 1846
# 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') | \
1849
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1850

1851 1852
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1853

1854
kernelversion:
1855
	@echo $(KERNELVERSION)
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1856

1857 1858 1859
image_name:
	@echo $(KBUILD_IMAGE)

1860
# Clear a bunch of variables before executing the submake
1861 1862 1863 1864 1865

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

1866
tools/: FORCE
1867
	$(Q)mkdir -p $(objtree)/tools
1868
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1869 1870

tools/%: FORCE
1871
	$(Q)mkdir -p $(objtree)/tools
1872
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1873

L
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1874
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1875
      cmd_rmfiles = rm -rf $(rm-files)
L
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1876

1877
# Run depmod only if we have System.map and depmod is executable
1878
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1879
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1880
                   $(KERNELRELEASE)
1881

1882 1883
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
L
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1884

1885
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1886

1887
endif # config-build
1888 1889
endif # mixed-build
endif # need-sub-make
L
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1890

1891
PHONY += FORCE
L
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1892
FORCE:
1893

1894
# Declare the contents of the PHONY variable as phony.  We keep that
1895
# information in a variable so we can use it in if_changed and friends.
1896
.PHONY: $(PHONY)