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

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

577
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.

582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
# 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

620
ifdef need-config
621 622 623
include include/config/auto.conf
endif

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ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
627
drivers-y	:= drivers/ sound/
628
drivers-$(CONFIG_SAMPLES) += samples/
629
drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
633
virt-y		:= virt/
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endif # KBUILD_EXTMOD

636 637 638 639 640 641 642 643 644
# 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,)
645
export CFLAGS_GCOV
646

647 648 649 650 651
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
ifdef CONFIG_FUNCTION_TRACER
  CC_FLAGS_FTRACE := -pg
endif

652 653 654 655 656 657 658 659 660
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

661 662 663 664 665 666
# 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/$(SRCARCH)/Makefile
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668 669
ifdef need-config
ifdef may-sync-config
670 671 672
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
673
include include/config/auto.conf.cmd
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675 676 677 678 679 680 681 682
$(KCONFIG_CONFIG):
	@echo >&2 '***'
	@echo >&2 '*** Configuration file "$@" 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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684 685 686
# 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).
687 688 689 690
#
# 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)
691
	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
692
else # !may-sync-config
693 694 695
# 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
696 697 698
PHONY += include/config/auto.conf

include/config/auto.conf:
699
	$(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 ;							\
705 706
	/bin/false)

707
endif # may-sync-config
708
endif # need-config
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710
KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
711
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
712 713
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
714
KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
715

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
717
KBUILD_CFLAGS	+= -Os
718 719 720
else
KBUILD_CFLAGS   += -O2
endif
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722 723 724
ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
KBUILD_CFLAGS   += -Wno-maybe-uninitialized
endif
725

726 727 728
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

729
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

742
ifneq ($(CONFIG_FRAME_WARN),0)
743 744 745
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

746
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
747 748
stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
749 750

KBUILD_CFLAGS += $(stackp-flags-y)
751

752
ifdef CONFIG_CC_IS_CLANG
753 754 755
KBUILD_CPPFLAGS += -Qunused-arguments
KBUILD_CFLAGS += -Wno-format-invalid-specifier
KBUILD_CFLAGS += -Wno-gnu
756
# Quiet clang warning: comparison of unsigned expression < 0 is always false
757
KBUILD_CFLAGS += -Wno-tautological-compare
758 759 760
# 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
761
KBUILD_CFLAGS += -mno-global-merge
762 763 764 765
else

# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
766
KBUILD_CFLAGS += -Wno-unused-but-set-variable
767 768
endif

769
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
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ifdef CONFIG_FRAME_POINTER
771
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
773 774 775 776 777 778
# 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
779
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
781
endif
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783 784 785 786 787
# Initialize all stack variables with a pattern, if desired.
ifdef CONFIG_INIT_STACK_ALL
KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
endif

788
DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
789

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
792
DEBUG_CFLAGS	+= -gsplit-dwarf
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else
794
DEBUG_CFLAGS	+= -g
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795
endif
796
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
798
ifdef CONFIG_DEBUG_INFO_DWARF4
799
DEBUG_CFLAGS	+= -gdwarf-4
800
endif
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802
ifdef CONFIG_DEBUG_INFO_REDUCED
803
DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
804
		   $(call cc-option,-fno-var-tracking)
805 806
endif

807 808 809
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS

810
ifdef CONFIG_FUNCTION_TRACER
811 812 813 814 815 816
ifdef CONFIG_FTRACE_MCOUNT_RECORD
  # gcc 5 supports generating the mcount tables directly
  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
    CC_FLAGS_FTRACE	+= -mrecord-mcount
    export CC_USING_RECORD_MCOUNT := 1
  endif
817 818 819 820 821 822
  ifdef CONFIG_HAVE_NOP_MCOUNT
    ifeq ($(call cc-option-yn, -mnop-mcount),y)
      CC_FLAGS_FTRACE	+= -mnop-mcount
      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
    endif
  endif
823
endif
824
ifdef CONFIG_HAVE_FENTRY
825 826 827 828
  ifeq ($(call cc-option-yn, -mfentry),y)
    CC_FLAGS_FTRACE	+= -mfentry
    CC_FLAGS_USING	+= -DCC_USING_FENTRY
  endif
829
endif
830 831 832
export CC_FLAGS_FTRACE
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
833
ifdef CONFIG_DYNAMIC_FTRACE
834
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
835 836 837 838
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
839 840
endif

841 842 843 844 845
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

846
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
847 848
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
LDFLAGS_vmlinux += --gc-sections
849 850
endif

851 852 853 854
ifdef CONFIG_LIVEPATCH
KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
endif

855
# 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)
857

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# warn about C99 declaration after statement
859
KBUILD_CFLAGS += -Wdeclaration-after-statement
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861
# Warn about unmarked fall-throughs in switch statement.
862
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
863

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# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
865
KBUILD_CFLAGS += -Wvla
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# disable pointer signed / unsigned warnings in gcc 4.0
868
KBUILD_CFLAGS += -Wno-pointer-sign
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870 871 872
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)

873
# disable invalid "can't wrap" optimizations for signed / pointers
874
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
875

876 877 878 879 880 881 882 883 884
# 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)

885 886 887
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

888 889 890
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

891 892 893
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

894 895 896
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

897 898 899
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

900 901 902
# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

903 904 905 906 907 908
# 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

909 910 911
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

912 913
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
914
include scripts/Makefile.ubsan
915

916 917 918 919 920
# 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)
921

922 923
KBUILD_LDFLAGS_MODULE += --build-id
LDFLAGS_vmlinux += --build-id
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Roland McGrath 已提交
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925
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
926
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
927 928
endif

929 930 931
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

932 933 934
# the checker needs the correct machine size
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)

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Linus Torvalds 已提交
935
# Default kernel image to build when no specific target is given.
S
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936
# KBUILD_IMAGE may be overruled on the command line or
L
Linus Torvalds 已提交
937 938 939 940 941 942 943 944 945 946
# 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

947 948 949 950 951 952 953
#
# 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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#
# 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
957
# makefile but the argument can be passed to make if needed.
L
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958 959
#

960
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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961 962
export MODLIB

963
#
964 965 966 967
# 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.
968

969 970
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
971
mod_strip_cmd = $(STRIP) --strip-debug
972
else
973
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
974 975
endif # INSTALL_MOD_STRIP=1
else
976
mod_strip_cmd = true
977 978 979
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

980 981 982 983 984 985 986
# 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
987
    mod_compress_cmd = gzip -n -f
988 989
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
990
    mod_compress_cmd = xz -f
991 992 993 994
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

995
ifdef CONFIG_MODULE_SIG_ALL
996 997 998
$(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
999 1000 1001 1002 1003
else
mod_sign_cmd = true
endif
export mod_sign_cmd

1004 1005
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)

1006 1007
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
1008
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1009 1010 1011 1012 1013 1014 1015 1016
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1017
PHONY += prepare0
1018

1019
export MODORDER := $(extmod-prefix)modules.order
1020

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Linus Torvalds 已提交
1021
ifeq ($(KBUILD_EXTMOD),)
1022
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
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1023 1024 1025

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1026
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
1027

1028 1029 1030
vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
			$(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
1031

1032
build-dirs	:= $(vmlinux-dirs)
1033
clean-dirs	:= $(vmlinux-alldirs)
1034

1035 1036 1037 1038
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
1039
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1040 1041
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
1042

1043
# Externally visible symbols (used by link-vmlinux.sh)
1044 1045
export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
			      $(drivers-y) $(net-y) $(virt-y)
1046
export KBUILD_VMLINUX_LIBS := $(libs-y1)
1047
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1048
export LDFLAGS_vmlinux
1049
# used by scripts/package/Makefile
1050
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1051

1052
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1053

1054 1055
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
1056
ifdef CONFIG_TRIM_UNUSED_KSYMS
1057
autoksyms_recursive: descend modules.order
1058
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1059
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1060
endif
1061

1062 1063 1064 1065 1066 1067 1068
# 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

1069 1070 1071 1072 1073
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)

$(autoksyms_h):
	$(Q)mkdir -p $(dir $@)
	$(Q)touch $@
1074

1075 1076 1077
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1078
cmd_link-vmlinux =                                                 \
1079
	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1080
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1081

1082
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1083
	+$(call if_changed,link-vmlinux)
1084

1085 1086
targets := vmlinux

1087
# The actual objects are generated when descending,
L
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1088
# make sure no implicit rule kicks in
1089
$(sort $(vmlinux-deps)): descend ;
L
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1090

1091
filechk_kernel.release = \
1092 1093
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

G
Geert Uytterhoeven 已提交
1094
# Store (new) KERNELRELEASE string in include/config/kernel.release
1095
include/config/kernel.release: FORCE
1096
	$(call filechk,kernel.release)
1097

1098 1099 1100 1101
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
1102
scripts: scripts_basic scripts_dtc
1103
	$(Q)$(MAKE) $(build)=$(@)
1104

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# Things we need to do before we recursively start building the kernel
1106 1107 1108 1109
# 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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1110

1111
PHONY += prepare archprepare prepare3
1112

1113
# prepare3 is used to check if we are building in a separate output directory,
L
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1114 1115
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
Roman Zippel 已提交
1116
prepare3: include/config/kernel.release
1117
ifdef building_out_of_srctree
1118
	@$(kecho) '  Using $(srctree) as source for kernel'
1119 1120 1121
	$(Q)if [ -f $(srctree)/.config -o \
		 -d $(srctree)/include/config -o \
		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1122
		echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
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		echo >&2 "  in the '$(srctree)' directory.";\
L
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1124 1125 1126 1127
		/bin/false; \
	fi;
endif

1128 1129
archprepare: archheaders archscripts scripts prepare3 outputmakefile \
	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1130

1131
prepare0: archprepare
1132
	$(Q)$(MAKE) $(build)=scripts/mod
1133
	$(Q)$(MAKE) $(build)=.
1134

L
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1135
# All the preparing..
1136 1137
prepare: prepare0 prepare-objtool

1138
# Support for using generic headers in asm-generic
1139 1140
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj

1141 1142
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
1143 1144
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
	generic=include/asm-generic
1145
uapi-asm-generic:
1146 1147
	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
	generic=include/uapi/asm-generic
1148

1149
PHONY += prepare-objtool
1150
prepare-objtool: $(objtool_target)
1151 1152 1153 1154 1155 1156 1157 1158
ifeq ($(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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define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
1172
	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
S
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endef
L
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1174 1175

define filechk_version.h
1176
	echo \#define LINUX_VERSION_CODE $(shell                         \
J
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1177
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1178
	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
L
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1179 1180
endef

1181
$(version_h): FORCE
L
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1182
	$(call filechk,version.h)
1183
	$(Q)rm -f $(old_version_h)
L
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1184

1185
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1186 1187
	$(call filechk,utsrelease.h)

1188 1189
PHONY += headerdep
headerdep:
1190 1191
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1192

1193 1194 1195
# ---------------------------------------------------------------------------
# Kernel headers

1196 1197
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1198

1199 1200 1201 1202 1203
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)
1204

1205
PHONY += headers_install
1206 1207
headers_install: headers
	$(call cmd,headers_install)
1208

1209
PHONY += archheaders archscripts
1210

1211
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1212

1213 1214
PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1215
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1216
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1217 1218
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1219

1220
PHONY += headers_check
1221
headers_check: headers
1222 1223
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1224

1225
ifdef CONFIG_HEADERS_INSTALL
1226
prepare: headers
1227
endif
1228

1229 1230 1231 1232
ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

1233 1234 1235 1236
PHONY += scripts_unifdef
scripts_unifdef: scripts_basic
	$(Q)$(MAKE) $(build)=scripts scripts/unifdef

1237 1238 1239 1240 1241
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1242
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1243

1244
PHONY += kselftest-clean
W
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1245
kselftest-clean:
1246
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1247

1248 1249 1250
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1251 1252
	$(Q)find $(srctree)/tools/testing/selftests -name config | \
		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1253 1254
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
# ---------------------------------------------------------------------------
# Devicetree files

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

ifneq ($(dtstree),)

%.dtb: prepare3 scripts_dtc
	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

1267 1268
PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc
1269 1270
	$(Q)$(MAKE) $(build)=$(dtstree)

1271 1272 1273
dtbs_check: export CHECK_DTBS=1
dtbs_check: dt_binding_check

1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
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

1287 1288 1289
dt_binding_check: scripts_dtc
	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings

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# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

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1295
# By default, build modules as well
L
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1296

1297
all: modules
L
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1298

1299
# Build modules
T
Tejun Heo 已提交
1300
#
1301 1302 1303
# 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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1304

1305
PHONY += modules
1306
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
S
Sam Ravnborg 已提交
1307
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1308
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
L
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1310 1311
modules.order: descend
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1312

1313
modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1314

1315
modules.builtin: $(modbuiltin-dirs)
1316
	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1317

1318 1319 1320 1321 1322
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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1323 1324

# Target to prepare building external modules
1325
PHONY += modules_prepare
1326
modules_prepare: prepare
L
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1327 1328

# Target to install modules
1329
PHONY += modules_install
L
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1330 1331
modules_install: _modinst_ _modinst_post

1332
PHONY += _modinst_
1333
_modinst_:
L
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1334 1335 1336
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1337
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1338 1339
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1340
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
Linus Torvalds 已提交
1341
	fi
1342 1343
	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
	@sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1344
	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
S
Sam Ravnborg 已提交
1345
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1346

1347
# This depmod is only for convenience to give the initial
L
Linus Torvalds 已提交
1348 1349
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1350
PHONY += _modinst_post
1351
_modinst_post: _modinst_
1352
	$(call cmd,depmod)
L
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J
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1354 1355 1356 1357 1358 1359
ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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1360 1361 1362 1363 1364
else # CONFIG_MODULES

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

1365 1366
PHONY += modules modules_install
modules modules_install:
M
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1367 1368 1369 1370 1371
	@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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1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
	@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'
1384
CLEAN_DIRS  += include/ksym
1385
CLEAN_FILES += modules.builtin.modinfo
L
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1386 1387

# Directories & files removed with 'make mrproper'
1388
MRPROPER_DIRS  += include/config include/generated          \
1389
		  arch/$(SRCARCH)/include/generated .tmp_objdiff
1390
MRPROPER_FILES += .config .config.old .version \
1391
		  Module.symvers \
1392 1393
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1394
		  signing_key.x509.signer vmlinux-gdb.py
L
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1395

1396 1397 1398 1399
# Directories & files removed with 'make distclean'
DISTCLEAN_DIRS  +=
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

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

1405
PHONY += archclean vmlinuxclean
L
Linus Torvalds 已提交
1406

1407 1408
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1409
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1410 1411

clean: archclean vmlinuxclean
L
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1412 1413 1414 1415 1416

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1417
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1418

1419
PHONY += $(mrproper-dirs) mrproper
L
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1420 1421 1422
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

1423
mrproper: clean $(mrproper-dirs)
L
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1424 1425 1426 1427 1428
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1429 1430 1431
distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))

1432
PHONY += distclean
L
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1433 1434

distclean: mrproper
1435 1436
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
L
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1437
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
Sam Ravnborg 已提交
1438
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1439 1440
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1441 1442 1443 1444 1445
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
1446
package-dir	:= scripts/package
L
Linus Torvalds 已提交
1447

1448 1449
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1450
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1451
	$(Q)$(MAKE) $(build)=$(package-dir) $@
L
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1452 1453 1454 1455 1456


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

1457
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1458
boards := $(sort $(notdir $(boards)))
1459 1460
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1461

1462
PHONY += help
L
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1463 1464
help:
	@echo  'Cleaning targets:'
1465
	@echo  '  clean		  - Remove most generated files but keep the config and'
1466
	@echo  '                    enough build support to build external modules'
1467
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1468
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1469 1470 1471 1472 1473 1474 1475 1476
	@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'
1477
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
Linus Torvalds 已提交
1478
	@echo  '  dir/            - Build all files in dir and below'
1479
	@echo  '  dir/file.[ois]  - Build specified target only'
1480 1481
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1482 1483
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1484
	@echo  '  dir/file.ko     - Build module including final link'
1485
	@echo  '  modules_prepare - Set up for building external modules'
L
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1486 1487
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1488
	@echo  '  gtags           - Generate GNU GLOBAL index'
1489 1490 1491
	@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)'
1492
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1493
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1494
	 echo  ''
R
Randy Dunlap 已提交
1495
	@echo  'Static analysers:'
L
Linus Torvalds 已提交
1496 1497
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1498
	@echo  '  versioncheck    - Sanity check on version.h usage'
1499
	@echo  '  includecheck    - Check for duplicate included header files'
1500
	@echo  '  export_report   - List the usages of all exported symbols'
1501
	@echo  '  headers_check   - Sanity check on exported headers'
1502
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1503
	@echo  '  coccicheck      - Check with Coccinelle'
1504
	@echo  ''
R
Randy Dunlap 已提交
1505
	@echo  'Kernel selftest:'
1506 1507 1508
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
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1509
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1510
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1511
	@echo  '                    .config.'
1512
	@echo  ''
1513 1514 1515 1516 1517 1518
	@$(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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1523
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1524
	@$(MAKE) $(build)=$(package-dir) help
L
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1525 1526
	@echo  ''
	@echo  'Documentation targets:'
1527
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1528
	@echo  ''
1529
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1530
	@$(if $(archhelp),$(archhelp),\
1531
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1532 1533 1534 1535 1536
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1537 1538 1539 1540 1541
	@$(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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1542 1543

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1544
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
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	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1547
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1548
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1549 1550 1551 1552
	@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'
1553
	@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'


1559 1560 1561 1562
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1563
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1564 1565 1566 1567 1568 1569 1570 1571 1572

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1575 1576
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1577 1578
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1579
	$(Q)$(MAKE) $(build)=Documentation $@
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1581 1582 1583 1584
# Misc
# ---------------------------------------------------------------------------

PHONY += scripts_gdb
1585
scripts_gdb: prepare0
1586
	$(Q)$(MAKE) $(build)=scripts/gdb
1587
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1588 1589 1590 1591 1592

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

1615
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 )

1623 1624 1625
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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1628
PHONY += modules_install
1629
modules_install: _emodinst_ _emodinst_post
1630

1631 1632
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1633 1634
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1637
PHONY += _emodinst_post
1638 1639 1640
_emodinst_post: _emodinst_
	$(call cmd,depmod)

1641
clean-dirs := $(KBUILD_EXTMOD)
1642
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1644 1645 1646 1647
PHONY += /
/:
	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'

1648
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  ''
1657

1658
PHONY += prepare
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endif # KBUILD_EXTMOD

1661 1662 1663 1664 1665 1666 1667 1668
# 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
1669
	$(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1670

1671 1672 1673 1674 1675
clean-dirs := $(addprefix _clean_, $(clean-dirs))
PHONY += $(clean-dirs) clean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1676 1677 1678
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1679
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1680
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1681 1682
		-o -name '*.ko.*' \
		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1683
		-o -name '*.dwo' -o -name '*.lst' \
1684
		-o -name '*.su' -o -name '*.mod' \
1685
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1686
		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1687
		-o -name '*.asn1.[ch]' \
1688 1689
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1691
		-o -name '*.ll' \
1692 1693
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1696 1697
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1699
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:
1708
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1710
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1713
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1715
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1717 1718 1719
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1723 1724 1725
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

1726
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 $$(find . -name '*.ko') | \
1739
	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1741 1742
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1743

1744
kernelversion:
1745
	@echo $(KERNELVERSION)
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1747 1748 1749
image_name:
	@echo $(KBUILD_IMAGE)

1750
# Clear a bunch of variables before executing the submake
1751 1752 1753 1754 1755

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

1756
tools/: FORCE
1757
	$(Q)mkdir -p $(objtree)/tools
1758
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1759 1760

tools/%: FORCE
1761
	$(Q)mkdir -p $(objtree)/tools
1762
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1763

1764 1765
# Single targets
# ---------------------------------------------------------------------------
1766 1767 1768
# To build individual files in subdirectories, you can do like this:
#
#   make foo/bar/baz.s
1769
#
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
# 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
	@:

1789
ifeq ($(KBUILD_EXTMOD),)
1790
# For the single build of in-tree modules, use a temporary file to avoid
1791
# the situation of modules_install installing an invalid modules.order.
1792
MODORDER := .modules.tmp
1793
endif
1794 1795 1796 1797

PHONY += single_modpost
single_modpost: $(single-no-ko)
	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1798
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1799 1800 1801 1802 1803 1804 1805 1806

KBUILD_MODULES := 1

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

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

endif
1807

1808
# 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)

1817
# Run depmod only if we have System.map and depmod is executable
1818
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1820
                   $(KERNELRELEASE)
1821

1822 1823
# read saved command lines for existing targets
existing-targets := $(wildcard $(sort $(targets)))
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1825
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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1827 1828 1829
endif # config-targets
endif # mixed-build
endif # need-sub-make
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1831
PHONY += FORCE
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FORCE:
1833

1834
# Declare the contents of the PHONY variable as phony.  We keep that
1835
# information in a variable so we can use it in if_changed and friends.
1836
.PHONY: $(PHONY)