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# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 3
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SUBLEVEL = 0
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EXTRAVERSION = -rc4
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NAME = Bobtail Squid
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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

# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
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  $(warning ================= WARNING ================)
  $(warning 'SUBDIRS' will be removed after Linux 5.3)
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  $(warning )
  $(warning If you are building an individual subdirectory)
  $(warning in the kernel tree, you can do like this:)
  $(warning $$ make path/to/dir/you/want/to/build/)
  $(warning (Do not forget the trailing slash))
  $(warning )
  $(warning If you are building an external module,)
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  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
  $(warning ==========================================)
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  KBUILD_EXTMOD ?= $(SUBDIRS)
endif

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
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	  else if [ -x /bin/bash ]; then echo /bin/bash; \
	  else echo sh; fi ; fi)

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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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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 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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export KBUILD_ARFLAGS
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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.
568
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
569

570
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'
578
include arch/$(SRCARCH)/Makefile
579
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
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581
config: outputmakefile scripts_basic FORCE
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582 583
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

584
%config: outputmakefile scripts_basic FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

587
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.

592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
# 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

ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  KBUILD_MODULES := 1
endif

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

export KBUILD_MODULES KBUILD_BUILTIN

630
ifdef need-config
631 632 633
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
637
drivers-y	:= drivers/ sound/
638
drivers-$(CONFIG_SAMPLES) += samples/
639
drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
643
virt-y		:= virt/
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endif # KBUILD_EXTMOD

646 647 648 649 650 651 652 653 654
# 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,)
655
export CFLAGS_GCOV
656

657 658 659 660 661
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

662 663 664 665 666 667 668 669 670
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

671 672 673 674 675 676
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
# values of the respective KBUILD_* variables
ARCH_CPPFLAGS :=
ARCH_AFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile
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678 679
ifdef need-config
ifdef may-sync-config
680 681 682
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
683
include include/config/auto.conf.cmd
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685 686 687 688 689 690 691 692
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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694 695 696
# 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).
697 698 699 700
#
# 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)
701
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
702
else # !may-sync-config
703 704 705
# 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
706 707 708
PHONY += include/config/auto.conf

include/config/auto.conf:
709
	$(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 ;							\
715 716
	/bin/false)

717
endif # may-sync-config
718
endif # need-config
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720
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
721
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
722 723
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
724
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
725

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
727
KBUILD_CFLAGS	+= -Os
728 729 730
else
KBUILD_CFLAGS   += -O2
endif
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731

732 733 734
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
735

736 737 738
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

739
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

752
ifneq ($(CONFIG_FRAME_WARN),0)
753 754 755
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

756
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
757 758
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
759 760

KBUILD_CFLAGS += $(stackp-flags-y)
761

762
ifdef CONFIG_CC_IS_CLANG
763 764 765
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
766
# Quiet clang warning: comparison of unsigned expression < 0 is always false
767
KBUILD_CFLAGS += -Wno-tautological-compare
768 769 770
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
771
KBUILD_CFLAGS += -mno-global-merge
772 773 774 775
else

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

779
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
781
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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782
else
783 784 785 786 787 788
# 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
789
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
791
endif
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792

793 794 795 796 797
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

798
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
799

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ifdef CONFIG_DEBUG_INFO
A
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801
ifdef CONFIG_DEBUG_INFO_SPLIT
802
DEBUG_CFLAGS	+= -gsplit-dwarf
A
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803
else
804
DEBUG_CFLAGS	+= -g
A
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805
endif
806
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
808
ifdef CONFIG_DEBUG_INFO_DWARF4
809
DEBUG_CFLAGS	+= -gdwarf-4
810
endif
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812
ifdef CONFIG_DEBUG_INFO_REDUCED
813
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
814
		   $(call cc-option,-fno-var-tracking)
815 816
endif

817 818 819
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

820
ifdef CONFIG_FUNCTION_TRACER
821 822 823 824 825 826
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
827 828 829 830 831 832
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
833
endif
834
ifdef CONFIG_HAVE_FENTRY
835 836 837 838
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
839
endif
840 841 842
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
843
ifdef CONFIG_DYNAMIC_FTRACE
844
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
845 846 847 848
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
849 850
endif

851 852 853 854 855
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

856
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
857 858
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
859 860
endif

861 862 863 864
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

865
# 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)
867

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868
# warn about C99 declaration after statement
869
KBUILD_CFLAGS += -Wdeclaration-after-statement
L
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870

871
# Warn about unmarked fall-throughs in switch statement.
872
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
873

K
Kees Cook 已提交
874
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
875
KBUILD_CFLAGS += -Wvla
K
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S
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877
# disable pointer signed / unsigned warnings in gcc 4.0
878
KBUILD_CFLAGS += -Wno-pointer-sign
L
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879

880 881 882
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

883
# disable invalid "can't wrap" optimizations for signed / pointers
884
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
885

886 887 888 889 890 891 892 893 894
# 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)

895 896 897
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

898 899 900
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

901 902 903
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

904 905 906
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

907 908 909
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

910 911 912
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

913 914 915 916 917 918
# 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

919 920 921
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

922 923
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
924
include scripts/Makefile.ubsan
925

926 927 928 929 930
# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
# last assignments
KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
931

932 933
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
R
Roland McGrath 已提交
934

935
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
936
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
937 938
endif

939 940 941
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

942 943 944
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

L
Linus Torvalds 已提交
945
# Default kernel image to build when no specific target is given.
S
Sam Ravnborg 已提交
946
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
947 948 949 950 951 952 953 954 955 956
# 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

957 958 959 960 961 962 963
#
# 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)

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964 965 966
#
# 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
967
# makefile but the argument can be passed to make if needed.
L
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968 969
#

970
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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971 972
export MODLIB

973
#
974 975 976 977
# 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.
978

979 980
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
981
mod_strip_cmd = $(STRIP) --strip-debug
982
else
983
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
984 985
endif # INSTALL_MOD_STRIP=1
else
986
mod_strip_cmd = true
987 988 989
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

990 991 992 993 994 995 996
# 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
997
    mod_compress_cmd = gzip -n -f
998 999
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
1000
    mod_compress_cmd = xz -f
1001 1002 1003 1004
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

1005
ifdef CONFIG_MODULE_SIG_ALL
1006 1007 1008
$(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
1009 1010 1011 1012 1013
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1014 1015
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1016 1017
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
1018
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1019 1020 1021 1022 1023 1024 1025 1026
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1027
PHONY += prepare0
1028

1029
export MODORDER := $(extmod-prefix)modules.order
1030

L
Linus Torvalds 已提交
1031
ifeq ($(KBUILD_EXTMOD),)
1032
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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1033 1034 1035

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1036
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
1037

1038 1039 1040
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
1041

1042
build-dirs	:= $(vmlinux-dirs)
1043
clean-dirs	:= $(vmlinux-alldirs)
1044

1045 1046 1047 1048
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
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1049
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1050 1051
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
1052

1053
# Externally visible symbols (used by link-vmlinux.sh)
1054 1055
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1056
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1057
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1058
export LDFLAGS_vmlinux
1059
# used by scripts/package/Makefile
1060
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1061

1062
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1063

1064 1065
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1066
ifdef CONFIG_TRIM_UNUSED_KSYMS
1067
autoksyms_recursive: descend modules.order
1068
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1069
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1070
endif
1071

1072 1073 1074 1075 1076 1077 1078
# 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

1079 1080 1081 1082 1083
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1084

1085 1086 1087
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1088
cmd_link-vmlinux =                                                 \
1089
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1090
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1091

1092
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1093
	+$(call if_changed,link-vmlinux)
1094

1095 1096
targets := vmlinux

1097
# The actual objects are generated when descending,
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1098
# make sure no implicit rule kicks in
1099
$(sort $(vmlinux-deps)): descend ;
L
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1101
filechk_kernel.release = \
1102 1103
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

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# Store (new) KERNELRELEASE string in include/config/kernel.release
1105
include/config/kernel.release: FORCE
1106
	$(call filechk,kernel.release)
1107

1108 1109 1110 1111
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1112
scripts: scripts_basic scripts_dtc
1113
	$(Q)$(MAKE) $(build)=$(@)
1114

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1115
# Things we need to do before we recursively start building the kernel
1116 1117 1118 1119
# 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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1120

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1121
PHONY += prepare archprepare
1122

1123
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1124
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1125

1126
prepare0: archprepare
1127
	$(Q)$(MAKE) $(build)=scripts/mod
1128
	$(Q)$(MAKE) $(build)=.
1129

L
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1130
# All the preparing..
1131 1132
prepare: prepare0 prepare-objtool

1133
# Support for using generic headers in asm-generic
1134 1135
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1136 1137
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1138 1139
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1140
uapi-asm-generic:
1141 1142
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1143

1144
PHONY += prepare-objtool
1145
prepare-objtool: $(objtool_target)
1146 1147 1148 1149 1150 1151 1152 1153
ifeq ($(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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1162 1163 1164 1165 1166
define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1167
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
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endef
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1169 1170

define filechk_version.h
1171
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
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1172
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1173
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
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endef

1176
$(version_h): FORCE
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	$(call filechk,version.h)
1178
	$(Q)rm -f $(old_version_h)
L
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1179

1180
include/generated/utsrelease.h: include/config/kernel.release FORCE
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1181 1182
	$(call filechk,utsrelease.h)

1183 1184
PHONY += headerdep
headerdep:
1185 1186
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1187

1188 1189 1190
# ---------------------------------------------------------------------------
# Kernel headers

1191 1192
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1193

1194 1195 1196 1197 1198
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)
1199

1200
PHONY += headers_install
1201 1202
headers_install: headers
	$(call cmd,headers_install)
1203

1204
PHONY += archheaders archscripts
1205

1206
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1207

1208 1209
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1210
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1211
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1212 1213
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1214

1215
PHONY += headers_check
1216
headers_check: headers
1217 1218
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1219

1220
ifdef CONFIG_HEADERS_INSTALL
1221
prepare: headers
1222
endif
1223

1224 1225 1226 1227
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1228 1229 1230 1231
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1232 1233 1234 1235 1236
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1237
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1238

1239
PHONY += kselftest-clean
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kselftest-clean:
1241
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
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1242

1243 1244 1245
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1246 1247
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1248
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1249

1250 1251 1252 1253 1254 1255 1256 1257 1258
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

M
Masahiro Yamada 已提交
1259
%.dtb: include/config/kernel.release scripts_dtc
1260 1261
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1262
PHONY += dtbs dtbs_install dt_binding_check
M
Masahiro Yamada 已提交
1263
dtbs dtbs_check: include/config/kernel.release scripts_dtc
1264 1265
	$(Q)$(MAKE) $(build)=$(dtstree)

1266 1267 1268
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
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

1282 1283 1284
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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1285 1286 1287 1288 1289
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

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1290
# By default, build modules as well
L
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1291

1292
all: modules
L
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1293

1294
# Build modules
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1295
#
1296 1297 1298
# 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.
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1300
PHONY += modules
1301
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
S
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1302
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1303
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1304

1305 1306
modules.order: descend
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1307

1308
modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1309

1310
modules.builtin: $(modbuiltin-dirs)
1311
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1312

1313 1314 1315 1316 1317
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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1318 1319

# Target to prepare building external modules
1320
PHONY += modules_prepare
1321
modules_prepare: prepare
L
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1322 1323

# Target to install modules
1324
PHONY += modules_install
L
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1325 1326
modules_install: _modinst_ _modinst_post

1327
PHONY += _modinst_
1328
_modinst_:
L
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1329 1330 1331
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1332
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1333 1334
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1335
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1336
	fi
1337 1338
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1339
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1340
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
Linus Torvalds 已提交
1341

1342
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1343 1344
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1345
PHONY += _modinst_post
1346
_modinst_post: _modinst_
1347
	$(call cmd,depmod)
L
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J
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1349 1350 1351 1352 1353 1354
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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1355 1356 1357 1358 1359
else # CONFIG_MODULES

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

1360 1361
PHONY += modules modules_install
modules modules_install:
M
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1362 1363 1364 1365 1366
	@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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1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
	@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'
1379
CLEAN_DIRS  += include/ksym
1380
CLEAN_FILES += modules.builtin.modinfo
L
Linus Torvalds 已提交
1381 1382

# Directories & files removed with 'make mrproper'
1383
MRPROPER_DIRS  += include/config include/generated          \
1384 1385
		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
		  debian/ snap/ tar-install/
1386
MRPROPER_FILES += .config .config.old .version \
1387
		  Module.symvers \
1388 1389
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
1390 1391
		  signing_key.x509.signer vmlinux-gdb.py \
		  *.spec
L
Linus Torvalds 已提交
1392

1393 1394 1395 1396
# Directories & files removed with 'make distclean'
DISTCLEAN_DIRS  +=
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

L
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1397 1398 1399 1400 1401
# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)

1402
PHONY += archclean vmlinuxclean
L
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1403

1404 1405
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1406
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1407 1408

clean: archclean vmlinuxclean
L
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1409 1410 1411 1412 1413

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1414
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1415

1416
PHONY += $(mrproper-dirs) mrproper
L
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1417 1418 1419
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1420
mrproper: clean $(mrproper-dirs)
L
Linus Torvalds 已提交
1421 1422 1423 1424 1425
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1426 1427 1428
distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1429
PHONY += distclean
L
Linus Torvalds 已提交
1430 1431

distclean: mrproper
1432 1433
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
L
Linus Torvalds 已提交
1434
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1435
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1436 1437
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
Linus Torvalds 已提交
1438 1439 1440 1441 1442 1443
		-type f -print | xargs rm -f


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

1444
%src-pkg: FORCE
1445
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1446
%pkg: include/config/kernel.release FORCE
1447
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
L
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1448 1449 1450 1451

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

1452
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1453
boards := $(sort $(notdir $(boards)))
1454 1455
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1456

1457
PHONY += help
L
Linus Torvalds 已提交
1458 1459
help:
	@echo  'Cleaning targets:'
1460
	@echo  '  clean		  - Remove most generated files but keep the config and'
1461
	@echo  '                    enough build support to build external modules'
1462
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1463
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1464 1465 1466 1467 1468 1469 1470 1471
	@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'
1472
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1473
	@echo  '  dir/            - Build all files in dir and below'
1474
	@echo  '  dir/file.[ois]  - Build specified target only'
1475 1476
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1477 1478
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1479
	@echo  '  dir/file.ko     - Build module including final link'
1480
	@echo  '  modules_prepare - Set up for building external modules'
L
Linus Torvalds 已提交
1481 1482
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1483
	@echo  '  gtags           - Generate GNU GLOBAL index'
1484 1485 1486
	@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)'
1487
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1488
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1489
	 echo  ''
R
Randy Dunlap 已提交
1490
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1491 1492
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1493
	@echo  '  versioncheck    - Sanity check on version.h usage'
1494
	@echo  '  includecheck    - Check for duplicate included header files'
1495
	@echo  '  export_report   - List the usages of all exported symbols'
1496
	@echo  '  headers_check   - Sanity check on exported headers'
1497
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1498
	@echo  '  coccicheck      - Check with Coccinelle'
1499
	@echo  ''
R
Randy Dunlap 已提交
1500
	@echo  'Kernel selftest:'
1501 1502 1503
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
Wang Long 已提交
1504
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1505
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1506
	@echo  '                    .config.'
1507
	@echo  ''
1508 1509 1510 1511 1512 1513
	@$(if $(dtstree), \
		echo 'Devicetree:'; \
		echo '* dtbs            - Build device tree blobs for enabled boards'; \
		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
		echo '')

R
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	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1518
	@echo  'Kernel packaging:'
1519
	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
L
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1520 1521
	@echo  ''
	@echo  'Documentation targets:'
1522
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1523
	@echo  ''
1524
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1525
	@$(if $(archhelp),$(archhelp),\
1526
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1527 1528 1529 1530 1531
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1532 1533 1534 1535 1536
	@$(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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1537 1538

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1539
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
Linus Torvalds 已提交
1540
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
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	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1542
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1543
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1544 1545 1546 1547
	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
	@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'
1548
	@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'


1554 1555 1556 1557
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1558
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1559 1560 1561 1562 1563 1564 1565 1566 1567

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1570 1571
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1572
PHONY += $(DOC_TARGETS)
1573
$(DOC_TARGETS):
1574
	$(Q)$(MAKE) $(build)=Documentation $@
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1576 1577 1578 1579
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1580
scripts_gdb: prepare0
1581
	$(Q)$(MAKE) $(build)=scripts/gdb
1582
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1583 1584 1585 1586 1587

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

1610
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 )

1618 1619 1620
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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1623
PHONY += modules_install
1624
modules_install: _emodinst_ _emodinst_post
1625

1626 1627
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1628 1629
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1632
PHONY += _emodinst_post
1633 1634 1635
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1636
clean-dirs := $(KBUILD_EXTMOD)
1637
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1639 1640 1641 1642
PHONY += /
/:
	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'

1643
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  ''
1652

1653
PHONY += prepare
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endif # KBUILD_EXTMOD

1656 1657 1658 1659 1660 1661 1662 1663
# 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
1664
	$(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1665

1666 1667 1668 1669 1670
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1671 1672 1673
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1674
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1675
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1676 1677
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1678
		-o -name '*.dwo' -o -name '*.lst' \
1679
		-o -name '*.su' -o -name '*.mod' \
1680
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1681
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1682
		-o -name '*.asn1.[ch]' \
1683 1684
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1686
		-o -name '*.ll' \
1687 1688
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1691 1692
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1694
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

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

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PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1703
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1705
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1708
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1710
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1712 1713 1714
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1718 1719 1720
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1721
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 $$(find . -name '*.ko') | \
1734
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1736 1737
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1738

1739
kernelversion:
1740
	@echo $(KERNELVERSION)
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1742 1743 1744
image_name:
	@echo $(KBUILD_IMAGE)

1745
# Clear a bunch of variables before executing the submake
1746 1747 1748 1749 1750

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

1751
tools/: FORCE
1752
	$(Q)mkdir -p $(objtree)/tools
1753
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1754 1755

tools/%: FORCE
1756
	$(Q)mkdir -p $(objtree)/tools
1757
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1758

1759 1760
# Single targets
# ---------------------------------------------------------------------------
1761 1762 1763
# To build individual files in subdirectories, you can do like this:
#
#   make foo/bar/baz.s
1764
#
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
# 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
	@:

1784
ifeq ($(KBUILD_EXTMOD),)
1785
# For the single build of in-tree modules, use a temporary file to avoid
1786
# the situation of modules_install installing an invalid modules.order.
1787
MODORDER := .modules.tmp
1788
endif
1789 1790 1791 1792

PHONY += single_modpost
single_modpost: $(single-no-ko)
	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1793
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1794 1795 1796 1797 1798 1799 1800 1801

KBUILD_MODULES := 1

export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))

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

endif
1802

1803
# 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)

1812
# Run depmod only if we have System.map and depmod is executable
1813
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1815
                   $(KERNELRELEASE)
1816

1817 1818
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1820
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1821

1822 1823 1824
endif # config-targets
endif # mixed-build
endif # need-sub-make
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1825

1826
PHONY += FORCE
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FORCE:
1828

1829
# Declare the contents of the PHONY variable as phony.  We keep that
1830
# information in a variable so we can use it in if_changed and friends.
1831
.PHONY: $(PHONY)