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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 4
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SUBLEVEL = 0
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EXTRAVERSION = -rc4
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NAME = Nesting Opossum
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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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# That's our default target when none is given on the command line
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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# 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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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.
$(lastword $(MAKEFILE_LIST)): ;
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 _all sub-make $(lastword $(MAKEFILE_LIST)), $(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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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
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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

$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
	@:

__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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# 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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HOSTCC       = gcc
HOSTCXX      = g++
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KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
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		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
		$(HOSTCFLAGS)
KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
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# Make variables (CC, etc...)
AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
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OBJSIZE		= $(CROSS_COMPILE)size
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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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PYTHON2		= python2
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 AS LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
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=$(GCC_TOOLCHAIN)
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endif
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ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
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CLANG_FLAGS	+= -no-integrated-as
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endif
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CLANG_FLAGS	+= -Werror=unknown-warning-option
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KBUILD_CFLAGS	+= $(CLANG_FLAGS)
KBUILD_AFLAGS	+= $(CLANG_FLAGS)
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export CLANG_FLAGS
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endif

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# 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.
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CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
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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'
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include arch/$(SRCARCH)/Makefile
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export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
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563
config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

566
%config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

569
else #!config-build
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# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
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.
# 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.

ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
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

602
ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
603 604 605 606 607 608 609 610 611
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

612
ifdef need-config
613 614 615
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
619
drivers-y	:= drivers/ sound/
620
drivers-$(CONFIG_SAMPLES) += samples/
621
drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
625
virt-y		:= virt/
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endif # KBUILD_EXTMOD

628 629 630 631 632 633 634 635 636
# 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,)
637
export CFLAGS_GCOV
638

639 640 641 642 643
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

644 645 646 647 648 649 650 651 652
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

653
include arch/$(SRCARCH)/Makefile
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655 656
ifdef need-config
ifdef may-sync-config
657 658 659
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
660
include include/config/auto.conf.cmd
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662 663 664 665 666 667 668 669
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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671 672 673
# 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).
674 675 676 677
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
678
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679
else # !may-sync-config
680 681 682
# 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
683 684 685
PHONY += include/config/auto.conf

include/config/auto.conf:
686
	$(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 ;							\
692 693
	/bin/false)

694
endif # may-sync-config
695
endif # need-config
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697
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
698
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
699 700
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
701
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
702

703 704 705 706 707 708
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
709
endif
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711 712 713
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
714

715 716 717
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

718
include scripts/Makefile.kcov
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include scripts/Makefile.gcc-plugins

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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

731
ifneq ($(CONFIG_FRAME_WARN),0)
732 733 734
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

735
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
736 737
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
738 739

KBUILD_CFLAGS += $(stackp-flags-y)
740

741
ifdef CONFIG_CC_IS_CLANG
742 743 744
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
745
# Quiet clang warning: comparison of unsigned expression < 0 is always false
746
KBUILD_CFLAGS += -Wno-tautological-compare
747 748 749
# 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
750
KBUILD_CFLAGS += -mno-global-merge
751 752 753 754
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
755
KBUILD_CFLAGS += -Wno-unused-but-set-variable
756 757 758 759 760

# 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,)
761 762
endif

763
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
765
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
767 768 769 770 771 772
# 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
773
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
775
endif
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777 778 779 780 781
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

782
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
783

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
786
DEBUG_CFLAGS	+= -gsplit-dwarf
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else
788
DEBUG_CFLAGS	+= -g
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789
endif
790
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
792
ifdef CONFIG_DEBUG_INFO_DWARF4
793
DEBUG_CFLAGS	+= -gdwarf-4
794
endif
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796
ifdef CONFIG_DEBUG_INFO_REDUCED
797
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
798
		   $(call cc-option,-fno-var-tracking)
799 800
endif

801 802 803
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

804
ifdef CONFIG_FUNCTION_TRACER
805 806 807 808 809 810
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
811 812 813 814 815 816
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
817
endif
818
ifdef CONFIG_HAVE_FENTRY
819 820 821 822
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
823
endif
824 825 826
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
827
ifdef CONFIG_DYNAMIC_FTRACE
828
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
829 830 831 832
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
833 834
endif

835 836 837 838 839
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

840
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
841 842
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
843 844
endif

845 846 847 848
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

849
# arch Makefile may override CC so keep this after arch Makefile is included
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NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
851

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852
# warn about C99 declaration after statement
853
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
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K
Kees Cook 已提交
855
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
856
KBUILD_CFLAGS += -Wvla
K
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857

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858
# disable pointer signed / unsigned warnings in gcc 4.0
859
KBUILD_CFLAGS += -Wno-pointer-sign
L
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860

861 862 863
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

864
# disable invalid "can't wrap" optimizations for signed / pointers
865
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
866

867 868 869 870 871 872 873 874 875
# 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)

876 877 878
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

879 880 881
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

882 883 884
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

885 886 887
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

888 889 890
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

891 892 893
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

894 895 896 897 898 899
# 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

900 901
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
902
include scripts/Makefile.ubsan
903

904 905 906 907
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS   += $(KAFLAGS)
KBUILD_CFLAGS   += $(KCFLAGS)
908

909 910
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
R
Roland McGrath 已提交
911

912
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
914 915
endif

916 917 918 919
ifeq ($(CONFIG_RELR),y)
LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
endif

920 921 922
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

923 924 925
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
926
# Default kernel image to build when no specific target is given.
S
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927
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
928 929 930 931 932 933 934 935 936 937
# 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

938 939 940 941 942 943 944
#
# 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
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945 946 947
#
# 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
948
# makefile but the argument can be passed to make if needed.
L
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949 950
#

951
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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952 953
export MODLIB

954
#
955 956 957 958
# 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.
959

960 961
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
962
mod_strip_cmd = $(STRIP) --strip-debug
963
else
964
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
965 966
endif # INSTALL_MOD_STRIP=1
else
967
mod_strip_cmd = true
968 969 970
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

971 972 973 974 975 976 977
# 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
978
    mod_compress_cmd = gzip -n -f
979 980
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
981
    mod_compress_cmd = xz -f
982 983 984 985
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

986
ifdef CONFIG_MODULE_SIG_ALL
987 988 989
$(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
990 991 992 993 994
else
mod_sign_cmd = true
endif
export mod_sign_cmd

995 996
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

997 998
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
999
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1000 1001 1002 1003 1004 1005 1006 1007
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1008
PHONY += prepare0
1009

1010
export MODORDER := $(extmod-prefix)modules.order
1011

L
Linus Torvalds 已提交
1012
ifeq ($(KBUILD_EXTMOD),)
1013
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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1014 1015 1016

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1017
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
1018

1019 1020 1021
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
1022

1023
build-dirs	:= $(vmlinux-dirs)
1024
clean-dirs	:= $(vmlinux-alldirs)
1025

1026 1027 1028 1029
init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
L
Linus Torvalds 已提交
1030
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1031 1032
libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
L
Linus Torvalds 已提交
1033

1034
# Externally visible symbols (used by link-vmlinux.sh)
1035 1036
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1037
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1038
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1039
export LDFLAGS_vmlinux
1040
# used by scripts/Makefile.package
1041
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1042

1043
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1044

1045 1046
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1047
ifdef CONFIG_TRIM_UNUSED_KSYMS
1048
autoksyms_recursive: descend modules.order
1049
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1050
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1051
endif
1052

1053 1054 1055 1056 1057 1058 1059
# 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)
ifdef CONFIG_TRIM_UNUSED_KSYMS
  KBUILD_MODULES := 1
endif

1060 1061 1062 1063 1064
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1065

1066 1067 1068
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1069
cmd_link-vmlinux =                                                 \
1070
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1071
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1072

1073
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1074
	+$(call if_changed,link-vmlinux)
1075

1076 1077
targets := vmlinux

1078
# The actual objects are generated when descending,
L
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1079
# make sure no implicit rule kicks in
1080
$(sort $(vmlinux-deps)): descend ;
L
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1081

1082
filechk_kernel.release = \
1083 1084
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

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# Store (new) KERNELRELEASE string in include/config/kernel.release
1086
include/config/kernel.release: FORCE
1087
	$(call filechk,kernel.release)
1088

1089 1090 1091 1092
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1093
scripts: scripts_basic scripts_dtc
1094
	$(Q)$(MAKE) $(build)=$(@)
1095

L
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1096
# Things we need to do before we recursively start building the kernel
1097 1098 1099 1100
# 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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1101

M
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1102
PHONY += prepare archprepare
1103

1104
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1105
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1106

1107
prepare0: archprepare
1108
	$(Q)$(MAKE) $(build)=scripts/mod
1109
	$(Q)$(MAKE) $(build)=.
1110

L
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1111
# All the preparing..
1112 1113
prepare: prepare0 prepare-objtool

1114
# Support for using generic headers in asm-generic
1115 1116
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1117 1118
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1119 1120
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1121
uapi-asm-generic:
1122 1123
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1124

1125
PHONY += prepare-objtool
1126
prepare-objtool: $(objtool_target)
1127 1128 1129 1130 1131 1132 1133 1134
ifeq ($(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
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# Generate some files
# ---------------------------------------------------------------------------

# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds

uts_len := 64
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1143 1144 1145 1146 1147
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1148
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
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endef
L
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1150 1151

define filechk_version.h
1152
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
Jesper Juhl 已提交
1153
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1154
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
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1155 1156
endef

1157
$(version_h): FORCE
L
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1158
	$(call filechk,version.h)
1159
	$(Q)rm -f $(old_version_h)
L
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1160

1161
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1162 1163
	$(call filechk,utsrelease.h)

1164 1165
PHONY += headerdep
headerdep:
1166 1167
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1168

1169 1170 1171
# ---------------------------------------------------------------------------
# Kernel headers

1172 1173
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1174

1175 1176 1177 1178 1179
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)
1180

1181
PHONY += headers_install
1182 1183
headers_install: headers
	$(call cmd,headers_install)
1184

1185
PHONY += archheaders archscripts
1186

1187
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1188

1189 1190
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1191
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1192
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1193 1194
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1195

1196
PHONY += headers_check
1197
headers_check: headers
1198 1199
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1200

1201
ifdef CONFIG_HEADERS_INSTALL
1202
prepare: headers
1203
endif
1204

1205 1206 1207 1208
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1209 1210 1211 1212
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1213 1214 1215 1216 1217
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1218
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1219

1220 1221
kselftest-%: FORCE
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
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1223 1224 1225
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1226 1227
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1228
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1229

1230 1231 1232 1233 1234 1235 1236 1237 1238
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1239
%.dtb: include/config/kernel.release scripts_dtc
1240 1241
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1242
PHONY += dtbs dtbs_install dt_binding_check
M
Masahiro Yamada 已提交
1243
dtbs dtbs_check: include/config/kernel.release scripts_dtc
1244 1245
	$(Q)$(MAKE) $(build)=$(dtstree)

1246 1247 1248
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
dtbs_install:
	$(Q)$(MAKE) $(dtbinst)=$(dtstree)

ifdef CONFIG_OF_EARLY_FLATTREE
all: dtbs
endif

endif

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

1262 1263 1264
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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1265 1266 1267 1268 1269
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

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# By default, build modules as well
L
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1271

1272
all: modules
L
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1273

1274
# Build modules
T
Tejun Heo 已提交
1275
#
1276 1277 1278
# 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
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1279

1280
PHONY += modules
1281
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
S
Sam Ravnborg 已提交
1282
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1283
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1284

1285 1286
modules.order: descend
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1287

1288
modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1289

1290
modules.builtin: $(modbuiltin-dirs)
1291
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1292

1293 1294 1295 1296 1297
PHONY += $(modbuiltin-dirs)
# tristate.conf is not included from this Makefile. Add it as a prerequisite
# here to make it self-healing in case somebody accidentally removes it.
$(modbuiltin-dirs): include/config/tristate.conf
	$(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
L
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1298 1299

# Target to prepare building external modules
1300
PHONY += modules_prepare
1301
modules_prepare: prepare
L
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1302 1303

# Target to install modules
1304
PHONY += modules_install
L
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1305 1306
modules_install: _modinst_ _modinst_post

1307
PHONY += _modinst_
1308
_modinst_:
L
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1309 1310 1311
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1312
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1313 1314
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1315
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1316
	fi
1317 1318
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1319
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1320
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1321

1322
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1323 1324
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1325
PHONY += _modinst_post
1326
_modinst_post: _modinst_
1327
	$(call cmd,depmod)
L
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1328

J
Josh Boyer 已提交
1329 1330 1331 1332 1333 1334
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

L
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1335 1336 1337 1338 1339
else # CONFIG_MODULES

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

1340 1341
PHONY += modules modules_install
modules modules_install:
M
Michal Marek 已提交
1342 1343 1344 1345 1346
	@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
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1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
	@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'
1359
CLEAN_DIRS  += include/ksym
1360
CLEAN_FILES += modules.builtin.modinfo
L
Linus Torvalds 已提交
1361 1362

# Directories & files removed with 'make mrproper'
1363
MRPROPER_DIRS  += include/config include/generated          \
1364 1365
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
		  debian/ snap/ tar-install/
1366
MRPROPER_FILES += .config .config.old .version \
1367
		  Module.symvers \
1368 1369
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1370 1371
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1372

1373 1374 1375 1376
# Directories & files removed with 'make distclean'
DISTCLEAN_DIRS  +=
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
Linus Torvalds 已提交
1377 1378 1379 1380 1381
# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)

1382
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1383

1384 1385
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1386
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1387 1388

clean: archclean vmlinuxclean
L
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1389 1390 1391 1392 1393

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1394
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1395

1396
PHONY += $(mrproper-dirs) mrproper
L
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1397 1398 1399
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1400
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1401 1402 1403 1404 1405
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1406 1407 1408
distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1409
PHONY += distclean
L
Linus Torvalds 已提交
1410 1411

distclean: mrproper
1412 1413
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1414
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1415
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1416 1417
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1418 1419 1420 1421 1422 1423
		-type f -print | xargs rm -f


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

1424
%src-pkg: FORCE
1425
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1426
%pkg: include/config/kernel.release FORCE
1427
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
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1428 1429 1430 1431

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

1432
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1433
boards := $(sort $(notdir $(boards)))
1434 1435
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
Linus Torvalds 已提交
1436

1437
PHONY += help
L
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1438 1439
help:
	@echo  'Cleaning targets:'
1440
	@echo  '  clean		  - Remove most generated files but keep the config and'
1441
	@echo  '                    enough build support to build external modules'
1442
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1443
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1444 1445 1446 1447 1448 1449 1450 1451
	@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'
1452
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1453
	@echo  '  dir/            - Build all files in dir and below'
1454
	@echo  '  dir/file.[ois]  - Build specified target only'
1455 1456
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1457 1458
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1459
	@echo  '  dir/file.ko     - Build module including final link'
1460
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1461 1462
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1463
	@echo  '  gtags           - Generate GNU GLOBAL index'
1464 1465 1466
	@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)'
1467
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1468
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1469
	 echo  ''
R
Randy Dunlap 已提交
1470
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1471 1472
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1473
	@echo  '  versioncheck    - Sanity check on version.h usage'
1474
	@echo  '  includecheck    - Check for duplicate included header files'
1475
	@echo  '  export_report   - List the usages of all exported symbols'
1476
	@echo  '  headers_check   - Sanity check on exported headers'
1477
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1478
	@echo  '  coccicheck      - Check with Coccinelle'
1479
	@echo  ''
1480 1481 1482
	@echo  'Tools:'
	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
	@echo  ''
R
Randy Dunlap 已提交
1483
	@echo  'Kernel selftest:'
1484 1485 1486
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1487
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1488
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1489
	@echo  '                    .config.'
1490
	@echo  ''
1491 1492
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
1493 1494 1495 1496
		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';\
1497 1498
		echo '')

R
Randy Dunlap 已提交
1499 1500 1501 1502
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1503
	@echo  'Kernel packaging:'
1504
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
L
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1505 1506
	@echo  ''
	@echo  'Documentation targets:'
1507
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1508
	@echo  ''
1509
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1510
	@$(if $(archhelp),$(archhelp),\
1511
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1512 1513 1514 1515 1516
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1517 1518 1519 1520 1521
	@$(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 '')
L
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1522 1523

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1524
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1525
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
Cao jin 已提交
1526
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1527
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1528
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1529
	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1530 1531 1532
	@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'
1533
	@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'


1539 1540 1541 1542
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1543
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1544 1545 1546 1547 1548 1549 1550 1551 1552

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1555 1556
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1557
PHONY += $(DOC_TARGETS)
1558
$(DOC_TARGETS):
1559
	$(Q)$(MAKE) $(build)=Documentation $@
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1561 1562 1563 1564
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1565
scripts_gdb: prepare0
1566
	$(Q)$(MAKE) $(build)=scripts/gdb
1567
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1568 1569 1570 1571 1572

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

1595
PHONY += $(objtree)/Module.symvers
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$(objtree)/Module.symvers:
	@test -e $(objtree)/Module.symvers || ( \
	echo; \
	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
	echo "           is missing; modules will have no dependencies and modversions."; \
	echo )

1603 1604 1605
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
modules: descend $(objtree)/Module.symvers
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1607

1608
PHONY += modules_install
1609
modules_install: _emodinst_ _emodinst_post
1610

1611 1612
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1613 1614
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1616

1617
PHONY += _emodinst_post
1618 1619 1620
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1621
clean-dirs := $(KBUILD_EXTMOD)
1622
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1624 1625 1626 1627
PHONY += /
/:
	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'

1628
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  ''
1637

1638
PHONY += prepare
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endif # KBUILD_EXTMOD

1641 1642 1643 1644 1645 1646 1647 1648
# 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
1649
	$(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1650

1651 1652 1653 1654 1655
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1656 1657 1658
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1659
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1660
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1661 1662
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1663
		-o -name '*.dwo' -o -name '*.lst' \
1664
		-o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1665
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1666
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1667
		-o -name '*.asn1.[ch]' \
1668 1669
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1671
		-o -name '*.ll' \
1672 1673
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1676
quiet_cmd_tags = GEN     $@
1677
      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
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1679
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

1682 1683 1684 1685 1686 1687 1688 1689 1690
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------

PHONY += nsdeps

nsdeps: modules
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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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:
1697
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1699
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1702
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1704
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1705

1706
coccicheck:
1707
	$(Q)$(BASH) $(srctree)/scripts/$@
1708

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

1712 1713 1714
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1715
PHONY += checkstack kernelrelease kernelversion image_name
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# 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 $$(find . -name '*.ko') | \
1728
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1730 1731
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1732

1733
kernelversion:
1734
	@echo $(KERNELVERSION)
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1736 1737 1738
image_name:
	@echo $(KBUILD_IMAGE)

1739
# Clear a bunch of variables before executing the submake
1740 1741 1742 1743 1744

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

1745
tools/: FORCE
1746
	$(Q)mkdir -p $(objtree)/tools
1747
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1748 1749

tools/%: FORCE
1750
	$(Q)mkdir -p $(objtree)/tools
1751
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1752

1753 1754
# Single targets
# ---------------------------------------------------------------------------
1755 1756 1757
# To build individual files in subdirectories, you can do like this:
#
#   make foo/bar/baz.s
1758
#
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
# 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

single-all := $(filter $(single-targets), $(MAKECMDGOALS))

# .ko is special because modpost is needed
single-ko := $(sort $(filter %.ko, $(single-all)))
single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))

$(single-ko): single_modpost
	@:
$(single-no-ko): descend
	@:

1778
ifeq ($(KBUILD_EXTMOD),)
1779
# For the single build of in-tree modules, use a temporary file to avoid
1780
# the situation of modules_install installing an invalid modules.order.
1781
MODORDER := .modules.tmp
1782
endif
1783 1784 1785 1786

PHONY += single_modpost
single_modpost: $(single-no-ko)
	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1787
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1788

1789
KBUILD_MODULES := 1
1790

1791 1792 1793 1794 1795
export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))

single-build = $(if $(filter-out $@/, $(single-no-ko)),1)

endif
1796

1797
# FIXME Should go into a make.lib or something
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# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)

1806
# Run depmod only if we have System.map and depmod is executable
1807
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
M
Michal Marek 已提交
1808
      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1809
                   $(KERNELRELEASE)
1810

1811 1812
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1813

1814
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
L
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1815

1816 1817 1818
endif # config-targets
endif # mixed-build
endif # need-sub-make
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1819

1820
PHONY += FORCE
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1821
FORCE:
1822

1823
# Declare the contents of the PHONY variable as phony.  We keep that
1824
# information in a variable so we can use it in if_changed and friends.
1825
.PHONY: $(PHONY)