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   1# SPDX-License-Identifier: GPL-2.0
   2VERSION = 4
   3PATCHLEVEL = 15
   4SUBLEVEL = 14
   5EXTRAVERSION =
   6NAME = Fearless Coyote
   7
   8# *DOCUMENTATION*
   9# To see a list of typical targets execute "make help"
  10# More info can be located in ./README
  11# Comments in this file are targeted only to the developer, do not
  12# expect to learn how to build the kernel reading this file.
  13
  14# That's our default target when none is given on the command line
  15PHONY := _all
  16_all:
  17
  18# o Do not use make's built-in rules and variables
  19#   (this increases performance and avoids hard-to-debug behaviour);
  20# o Look for make include files relative to root of kernel src
  21MAKEFLAGS += -rR --include-dir=$(CURDIR)
  22
  23# Avoid funny character set dependencies
  24unexport LC_ALL
  25LC_COLLATE=C
  26LC_NUMERIC=C
  27export LC_COLLATE LC_NUMERIC
  28
  29# Avoid interference with shell env settings
  30unexport GREP_OPTIONS
  31
  32# We are using a recursive build, so we need to do a little thinking
  33# to get the ordering right.
  34#
  35# Most importantly: sub-Makefiles should only ever modify files in
  36# their own directory. If in some directory we have a dependency on
  37# a file in another dir (which doesn't happen often, but it's often
  38# unavoidable when linking the built-in.o targets which finally
  39# turn into vmlinux), we will call a sub make in that other dir, and
  40# after that we are sure that everything which is in that other dir
  41# is now up to date.
  42#
  43# The only cases where we need to modify files which have global
  44# effects are thus separated out and done before the recursive
  45# descending is started. They are now explicitly listed as the
  46# prepare rule.
  47
  48# Beautify output
  49# ---------------------------------------------------------------------------
  50#
  51# Normally, we echo the whole command before executing it. By making
  52# that echo $($(quiet)$(cmd)), we now have the possibility to set
  53# $(quiet) to choose other forms of output instead, e.g.
  54#
  55#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  56#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  57#
  58# If $(quiet) is empty, the whole command will be printed.
  59# If it is set to "quiet_", only the short version will be printed.
  60# If it is set to "silent_", nothing will be printed at all, since
  61# the variable $(silent_cmd_cc_o_c) doesn't exist.
  62#
  63# A simple variant is to prefix commands with $(Q) - that's useful
  64# for commands that shall be hidden in non-verbose mode.
  65#
  66#       $(Q)ln $@ :<
  67#
  68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
  70#
  71# To put more focus on warnings, be less verbose as default
  72# Use 'make V=1' to see the full commands
  73
  74ifeq ("$(origin V)", "command line")
  75  KBUILD_VERBOSE = $(V)
  76endif
  77ifndef KBUILD_VERBOSE
  78  KBUILD_VERBOSE = 0
  79endif
  80
  81ifeq ($(KBUILD_VERBOSE),1)
  82  quiet =
  83  Q =
  84else
  85  quiet=quiet_
  86  Q = @
  87endif
  88
  89# If the user is running make -s (silent mode), suppress echoing of
  90# commands
  91
  92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  93  quiet=silent_
  94  tools_silent=s
  95endif
  96
  97export quiet Q KBUILD_VERBOSE
  98
  99# kbuild supports saving output files in a separate directory.
 100# To locate output files in a separate directory two syntaxes are supported.
 101# In both cases the working directory must be the root of the kernel src.
 102# 1) O=
 103# Use "make O=dir/to/store/output/files/"
 104#
 105# 2) Set KBUILD_OUTPUT
 106# Set the environment variable KBUILD_OUTPUT to point to the directory
 107# where the output files shall be placed.
 108# export KBUILD_OUTPUT=dir/to/store/output/files/
 109# make
 110#
 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
 112# variable.
 113
 114# KBUILD_SRC is not intended to be used by the regular user (for now),
 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
 116ifeq ($(KBUILD_SRC),)
 117
 118# OK, Make called in directory where kernel src resides
 119# Do we want to locate output files in a separate directory?
 120ifeq ("$(origin O)", "command line")
 121  KBUILD_OUTPUT := $(O)
 122endif
 123
 124# Cancel implicit rules on top Makefile
 125$(CURDIR)/Makefile Makefile: ;
 126
 127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
 128  $(error main directory cannot contain spaces nor colons)
 129endif
 130
 131ifneq ($(KBUILD_OUTPUT),)
 132# check that the output directory actually exists
 133saved-output := $(KBUILD_OUTPUT)
 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 135                                                                && pwd)
 136$(if $(KBUILD_OUTPUT),, \
 137     $(error failed to create output directory "$(saved-output)"))
 138
 139PHONY += $(MAKECMDGOALS) sub-make
 140
 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 142        @:
 143
 144# Invoke a second make in the output directory, passing relevant variables
 145sub-make:
 146        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
 147        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 148
 149# Leave processing to above invocation of make
 150skip-makefile := 1
 151endif # ifneq ($(KBUILD_OUTPUT),)
 152endif # ifeq ($(KBUILD_SRC),)
 153
 154# We process the rest of the Makefile if this is the final invocation of make
 155ifeq ($(skip-makefile),)
 156
 157# Do not print "Entering directory ...",
 158# but we want to display it when entering to the output directory
 159# so that IDEs/editors are able to understand relative filenames.
 160MAKEFLAGS += --no-print-directory
 161
 162# Call a source code checker (by default, "sparse") as part of the
 163# C compilation.
 164#
 165# Use 'make C=1' to enable checking of only re-compiled files.
 166# Use 'make C=2' to enable checking of *all* source files, regardless
 167# of whether they are re-compiled or not.
 168#
 169# See the file "Documentation/dev-tools/sparse.rst" for more details,
 170# including where to get the "sparse" utility.
 171
 172ifeq ("$(origin C)", "command line")
 173  KBUILD_CHECKSRC = $(C)
 174endif
 175ifndef KBUILD_CHECKSRC
 176  KBUILD_CHECKSRC = 0
 177endif
 178
 179# Use make M=dir to specify directory of external module to build
 180# Old syntax make ... SUBDIRS=$PWD is still supported
 181# Setting the environment variable KBUILD_EXTMOD take precedence
 182ifdef SUBDIRS
 183  KBUILD_EXTMOD ?= $(SUBDIRS)
 184endif
 185
 186ifeq ("$(origin M)", "command line")
 187  KBUILD_EXTMOD := $(M)
 188endif
 189
 190ifeq ($(KBUILD_SRC),)
 191        # building in the source tree
 192        srctree := .
 193else
 194        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
 195                # building in a subdirectory of the source tree
 196                srctree := ..
 197        else
 198                srctree := $(KBUILD_SRC)
 199        endif
 200endif
 201
 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 203
 204objtree         := .
 205src             := $(srctree)
 206obj             := $(objtree)
 207
 208VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
 209
 210export srctree objtree VPATH
 211
 212# To make sure we do not include .config for any of the *config targets
 213# catch them early, and hand them over to scripts/kconfig/Makefile
 214# It is allowed to specify more targets when calling make, including
 215# mixing *config targets and build targets.
 216# For example 'make oldconfig all'.
 217# Detect when mixed targets is specified, and make a second invocation
 218# of make so .config is not included in this case either (for *config).
 219
 220version_h := include/generated/uapi/linux/version.h
 221old_version_h := include/linux/version.h
 222
 223no-dot-config-targets := clean mrproper distclean \
 224                         cscope gtags TAGS tags help% %docs check% coccicheck \
 225                         $(version_h) headers_% archheaders archscripts \
 226                         kernelversion %src-pkg
 227
 228config-targets := 0
 229mixed-targets  := 0
 230dot-config     := 1
 231
 232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 233        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 234                dot-config := 0
 235        endif
 236endif
 237
 238ifeq ($(KBUILD_EXTMOD),)
 239        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 240                config-targets := 1
 241                ifneq ($(words $(MAKECMDGOALS)),1)
 242                        mixed-targets := 1
 243                endif
 244        endif
 245endif
 246# install and modules_install need also be processed one by one
 247ifneq ($(filter install,$(MAKECMDGOALS)),)
 248        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 249                mixed-targets := 1
 250        endif
 251endif
 252
 253ifeq ($(mixed-targets),1)
 254# ===========================================================================
 255# We're called with mixed targets (*config and build targets).
 256# Handle them one by one.
 257
 258PHONY += $(MAKECMDGOALS) __build_one_by_one
 259
 260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 261        @:
 262
 263__build_one_by_one:
 264        $(Q)set -e; \
 265        for i in $(MAKECMDGOALS); do \
 266                $(MAKE) -f $(srctree)/Makefile $$i; \
 267        done
 268
 269else
 270
 271# We need some generic definitions (do not try to remake the file).
 272scripts/Kbuild.include: ;
 273include scripts/Kbuild.include
 274
 275# Read KERNELRELEASE from include/config/kernel.release (if it exists)
 276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 279
 280# SUBARCH tells the usermode build what the underlying arch is.  That is set
 281# first, and if a usermode build is happening, the "ARCH=um" on the command
 282# line overrides the setting of ARCH below.  If a native build is happening,
 283# then ARCH is assigned, getting whatever value it gets normally, and
 284# SUBARCH is subsequently ignored.
 285
 286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 287                                  -e s/sun4u/sparc64/ \
 288                                  -e s/arm.*/arm/ -e s/sa110/arm/ \
 289                                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
 290                                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 291                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
 292                                  -e s/riscv.*/riscv/)
 293
 294# Cross compiling and selecting different set of gcc/bin-utils
 295# ---------------------------------------------------------------------------
 296#
 297# When performing cross compilation for other architectures ARCH shall be set
 298# to the target architecture. (See arch/* for the possibilities).
 299# ARCH can be set during invocation of make:
 300# make ARCH=ia64
 301# Another way is to have ARCH set in the environment.
 302# The default ARCH is the host where make is executed.
 303
 304# CROSS_COMPILE specify the prefix used for all executables used
 305# during compilation. Only gcc and related bin-utils executables
 306# are prefixed with $(CROSS_COMPILE).
 307# CROSS_COMPILE can be set on the command line
 308# make CROSS_COMPILE=ia64-linux-
 309# Alternatively CROSS_COMPILE can be set in the environment.
 310# A third alternative is to store a setting in .config so that plain
 311# "make" in the configured kernel build directory always uses that.
 312# Default value for CROSS_COMPILE is not to prefix executables
 313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 314ARCH            ?= $(SUBARCH)
 315CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
 316
 317# Architecture as present in compile.h
 318UTS_MACHINE     := $(ARCH)
 319SRCARCH         := $(ARCH)
 320
 321# Additional ARCH settings for x86
 322ifeq ($(ARCH),i386)
 323        SRCARCH := x86
 324endif
 325ifeq ($(ARCH),x86_64)
 326        SRCARCH := x86
 327endif
 328
 329# Additional ARCH settings for sparc
 330ifeq ($(ARCH),sparc32)
 331       SRCARCH := sparc
 332endif
 333ifeq ($(ARCH),sparc64)
 334       SRCARCH := sparc
 335endif
 336
 337# Additional ARCH settings for sh
 338ifeq ($(ARCH),sh64)
 339       SRCARCH := sh
 340endif
 341
 342# Additional ARCH settings for tile
 343ifeq ($(ARCH),tilepro)
 344       SRCARCH := tile
 345endif
 346ifeq ($(ARCH),tilegx)
 347       SRCARCH := tile
 348endif
 349
 350KCONFIG_CONFIG  ?= .config
 351export KCONFIG_CONFIG
 352
 353# SHELL used by kbuild
 354CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 355          else if [ -x /bin/bash ]; then echo /bin/bash; \
 356          else echo sh; fi ; fi)
 357
 358HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
 359HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
 360HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 361
 362HOSTCC       = gcc
 363HOSTCXX      = g++
 364HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 365                -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
 366HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
 367HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 368HOST_LOADLIBES := $(HOST_LFS_LIBS)
 369
 370# Make variables (CC, etc...)
 371AS              = $(CROSS_COMPILE)as
 372LD              = $(CROSS_COMPILE)ld
 373CC              = $(CROSS_COMPILE)gcc
 374CPP             = $(CC) -E
 375AR              = $(CROSS_COMPILE)ar
 376NM              = $(CROSS_COMPILE)nm
 377STRIP           = $(CROSS_COMPILE)strip
 378OBJCOPY         = $(CROSS_COMPILE)objcopy
 379OBJDUMP         = $(CROSS_COMPILE)objdump
 380AWK             = awk
 381GENKSYMS        = scripts/genksyms/genksyms
 382INSTALLKERNEL  := installkernel
 383DEPMOD          = /sbin/depmod
 384PERL            = perl
 385PYTHON          = python
 386CHECK           = sparse
 387
 388CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 389                  -Wbitwise -Wno-return-void $(CF)
 390NOSTDINC_FLAGS  =
 391CFLAGS_MODULE   =
 392AFLAGS_MODULE   =
 393LDFLAGS_MODULE  =
 394CFLAGS_KERNEL   =
 395AFLAGS_KERNEL   =
 396LDFLAGS_vmlinux =
 397
 398# Use USERINCLUDE when you must reference the UAPI directories only.
 399USERINCLUDE    := \
 400                -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 401                -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 402                -I$(srctree)/include/uapi \
 403                -I$(objtree)/include/generated/uapi \
 404                -include $(srctree)/include/linux/kconfig.h
 405
 406# Use LINUXINCLUDE when you must reference the include/ directory.
 407# Needed to be compatible with the O= option
 408LINUXINCLUDE    := \
 409                -I$(srctree)/arch/$(SRCARCH)/include \
 410                -I$(objtree)/arch/$(SRCARCH)/include/generated \
 411                $(if $(KBUILD_SRC), -I$(srctree)/include) \
 412                -I$(objtree)/include \
 413                $(USERINCLUDE)
 414
 415KBUILD_AFLAGS   := -D__ASSEMBLY__
 416KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 417                   -fno-strict-aliasing -fno-common -fshort-wchar \
 418                   -Werror-implicit-function-declaration \
 419                   -Wno-format-security \
 420                   -std=gnu89
 421KBUILD_CPPFLAGS := -D__KERNEL__
 422KBUILD_AFLAGS_KERNEL :=
 423KBUILD_CFLAGS_KERNEL :=
 424KBUILD_AFLAGS_MODULE  := -DMODULE
 425KBUILD_CFLAGS_MODULE  := -DMODULE
 426KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 427GCC_PLUGINS_CFLAGS :=
 428
 429export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 430export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
 431export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 432export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 433
 434export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
 435export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 436export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 437export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 438export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 439export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 440export KBUILD_ARFLAGS
 441
 442# When compiling out-of-tree modules, put MODVERDIR in the module
 443# tree rather than in the kernel tree. The kernel tree might
 444# even be read-only.
 445export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 446
 447# Files to ignore in find ... statements
 448
 449export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 450                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 451                          -prune -o
 452export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 453                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
 454
 455# ===========================================================================
 456# Rules shared between *config targets and build targets
 457
 458# Basic helpers built in scripts/basic/
 459PHONY += scripts_basic
 460scripts_basic:
 461        $(Q)$(MAKE) $(build)=scripts/basic
 462        $(Q)rm -f .tmp_quiet_recordmcount
 463
 464# To avoid any implicit rule to kick in, define an empty command.
 465scripts/basic/%: scripts_basic ;
 466
 467PHONY += outputmakefile
 468# outputmakefile generates a Makefile in the output directory, if using a
 469# separate output directory. This allows convenient use of make in the
 470# output directory.
 471outputmakefile:
 472ifneq ($(KBUILD_SRC),)
 473        $(Q)ln -fsn $(srctree) source
 474        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
 475            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 476endif
 477
 478ifeq ($(cc-name),clang)
 479ifneq ($(CROSS_COMPILE),)
 480CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 481GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 482endif
 483ifneq ($(GCC_TOOLCHAIN),)
 484CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 485endif
 486KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 487KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 488endif
 489
 490RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 491RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 492RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 493export RETPOLINE_CFLAGS
 494
 495ifeq ($(config-targets),1)
 496# ===========================================================================
 497# *config targets only - make sure prerequisites are updated, and descend
 498# in scripts/kconfig to make the *config target
 499
 500# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 501# KBUILD_DEFCONFIG may point out an alternative default configuration
 502# used for 'make defconfig'
 503include arch/$(SRCARCH)/Makefile
 504export KBUILD_DEFCONFIG KBUILD_KCONFIG
 505
 506config: scripts_basic outputmakefile FORCE
 507        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 508
 509%config: scripts_basic outputmakefile FORCE
 510        $(Q)$(MAKE) $(build)=scripts/kconfig $@
 511
 512else
 513# ===========================================================================
 514# Build targets only - this includes vmlinux, arch specific targets, clean
 515# targets and others. In general all targets except *config targets.
 516
 517# If building an external module we do not care about the all: rule
 518# but instead _all depend on modules
 519PHONY += all
 520ifeq ($(KBUILD_EXTMOD),)
 521_all: all
 522else
 523_all: modules
 524endif
 525
 526# Decide whether to build built-in, modular, or both.
 527# Normally, just do built-in.
 528
 529KBUILD_MODULES :=
 530KBUILD_BUILTIN := 1
 531
 532# If we have only "make modules", don't compile built-in objects.
 533# When we're building modules with modversions, we need to consider
 534# the built-in objects during the descend as well, in order to
 535# make sure the checksums are up to date before we record them.
 536
 537ifeq ($(MAKECMDGOALS),modules)
 538  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 539endif
 540
 541# If we have "make <whatever> modules", compile modules
 542# in addition to whatever we do anyway.
 543# Just "make" or "make all" shall build modules as well
 544
 545ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 546  KBUILD_MODULES := 1
 547endif
 548
 549ifeq ($(MAKECMDGOALS),)
 550  KBUILD_MODULES := 1
 551endif
 552
 553export KBUILD_MODULES KBUILD_BUILTIN
 554
 555ifeq ($(KBUILD_EXTMOD),)
 556# Additional helpers built in scripts/
 557# Carefully list dependencies so we do not try to build scripts twice
 558# in parallel
 559PHONY += scripts
 560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
 561         asm-generic gcc-plugins
 562        $(Q)$(MAKE) $(build)=$(@)
 563
 564# Objects we will link into vmlinux / subdirs we need to visit
 565init-y          := init/
 566drivers-y       := drivers/ sound/ firmware/
 567net-y           := net/
 568libs-y          := lib/
 569core-y          := usr/
 570virt-y          := virt/
 571endif # KBUILD_EXTMOD
 572
 573ifeq ($(dot-config),1)
 574# Read in config
 575-include include/config/auto.conf
 576
 577ifeq ($(KBUILD_EXTMOD),)
 578# Read in dependencies to all Kconfig* files, make sure to run
 579# oldconfig if changes are detected.
 580-include include/config/auto.conf.cmd
 581
 582# To avoid any implicit rule to kick in, define an empty command
 583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
 584
 585# If .config is newer than include/config/auto.conf, someone tinkered
 586# with it and forgot to run make oldconfig.
 587# if auto.conf.cmd is missing then we are probably in a cleaned tree so
 588# we execute the config step to be sure to catch updated Kconfig files
 589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
 590        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
 591else
 592# external modules needs include/generated/autoconf.h and include/config/auto.conf
 593# but do not care if they are up-to-date. Use auto.conf to trigger the test
 594PHONY += include/config/auto.conf
 595
 596include/config/auto.conf:
 597        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 598        echo >&2;                                                       \
 599        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 600        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 601        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 602        echo >&2 ;                                                      \
 603        /bin/false)
 604
 605endif # KBUILD_EXTMOD
 606
 607else
 608# Dummy target needed, because used as prerequisite
 609include/config/auto.conf: ;
 610endif # $(dot-config)
 611
 612# For the kernel to actually contain only the needed exported symbols,
 613# we have to build modules as well to determine what those symbols are.
 614# (this can be evaluated only once include/config/auto.conf has been included)
 615ifdef CONFIG_TRIM_UNUSED_KSYMS
 616  KBUILD_MODULES := 1
 617endif
 618
 619# The all: target is the default when no target is given on the
 620# command line.
 621# This allow a user to issue only 'make' to build a kernel including modules
 622# Defaults to vmlinux, but the arch makefile usually adds further targets
 623all: vmlinux
 624
 625KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
 626KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
 627CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
 628export CFLAGS_GCOV CFLAGS_KCOV
 629
 630# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 631# values of the respective KBUILD_* variables
 632ARCH_CPPFLAGS :=
 633ARCH_AFLAGS :=
 634ARCH_CFLAGS :=
 635include arch/$(SRCARCH)/Makefile
 636
 637KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 638KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 639KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 640KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 641KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
 642
 643ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 644KBUILD_CFLAGS   += $(call cc-option,-Oz,-Os)
 645KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
 646else
 647ifdef CONFIG_PROFILE_ALL_BRANCHES
 648KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
 649else
 650KBUILD_CFLAGS   += -O2
 651endif
 652endif
 653
 654KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 655                        $(call cc-disable-warning,maybe-uninitialized,))
 656
 657# Tell gcc to never replace conditional load with a non-conditional one
 658KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 659
 660# check for 'asm goto'
 661ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
 662        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 663        KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 664endif
 665
 666include scripts/Makefile.kcov
 667include scripts/Makefile.gcc-plugins
 668
 669ifdef CONFIG_READABLE_ASM
 670# Disable optimizations that make assembler listings hard to read.
 671# reorder blocks reorders the control in the function
 672# ipa clone creates specialized cloned functions
 673# partial inlining inlines only parts of functions
 674KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 675                 $(call cc-option,-fno-ipa-cp-clone,) \
 676                 $(call cc-option,-fno-partial-inlining)
 677endif
 678
 679ifneq ($(CONFIG_FRAME_WARN),0)
 680KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 681endif
 682
 683# This selects the stack protector compiler flag. Testing it is delayed
 684# until after .config has been reprocessed, in the prepare-compiler-check
 685# target.
 686ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
 687  stackp-flag := -fstack-protector
 688  stackp-name := REGULAR
 689else
 690ifdef CONFIG_CC_STACKPROTECTOR_STRONG
 691  stackp-flag := -fstack-protector-strong
 692  stackp-name := STRONG
 693else
 694  # Force off for distro compilers that enable stack protector by default.
 695  stackp-flag := $(call cc-option, -fno-stack-protector)
 696endif
 697endif
 698# Find arch-specific stack protector compiler sanity-checking script.
 699ifdef CONFIG_CC_STACKPROTECTOR
 700  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
 701  stackp-check := $(wildcard $(stackp-path))
 702endif
 703KBUILD_CFLAGS += $(stackp-flag)
 704
 705ifeq ($(cc-name),clang)
 706KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 707KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
 708KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
 709KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
 710KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 711# Quiet clang warning: comparison of unsigned expression < 0 is always false
 712KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
 713# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 714# source of a reference will be _MergedGlobals and not on of the whitelisted names.
 715# See modpost pattern 2
 716KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
 717KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 718KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
 719KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 720else
 721
 722# These warnings generated too much noise in a regular build.
 723# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 724KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 725KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 726endif
 727
 728ifdef CONFIG_FRAME_POINTER
 729KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 730else
 731# Some targets (ARM with Thumb2, for example), can't be built with frame
 732# pointers.  For those, we don't have FUNCTION_TRACER automatically
 733# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 734# incompatible with -fomit-frame-pointer with current GCC, so we don't use
 735# -fomit-frame-pointer with FUNCTION_TRACER.
 736ifndef CONFIG_FUNCTION_TRACER
 737KBUILD_CFLAGS   += -fomit-frame-pointer
 738endif
 739endif
 740
 741KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
 742
 743ifdef CONFIG_DEBUG_INFO
 744ifdef CONFIG_DEBUG_INFO_SPLIT
 745KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
 746else
 747KBUILD_CFLAGS   += -g
 748endif
 749KBUILD_AFLAGS   += -Wa,-gdwarf-2
 750endif
 751ifdef CONFIG_DEBUG_INFO_DWARF4
 752KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
 753endif
 754
 755ifdef CONFIG_DEBUG_INFO_REDUCED
 756KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
 757                   $(call cc-option,-fno-var-tracking)
 758endif
 759
 760ifdef CONFIG_FUNCTION_TRACER
 761ifndef CC_FLAGS_FTRACE
 762CC_FLAGS_FTRACE := -pg
 763endif
 764export CC_FLAGS_FTRACE
 765ifdef CONFIG_HAVE_FENTRY
 766CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
 767endif
 768KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
 769KBUILD_AFLAGS   += $(CC_USING_FENTRY)
 770ifdef CONFIG_DYNAMIC_FTRACE
 771        ifdef CONFIG_HAVE_C_RECORDMCOUNT
 772                BUILD_C_RECORDMCOUNT := y
 773                export BUILD_C_RECORDMCOUNT
 774        endif
 775endif
 776endif
 777
 778# We trigger additional mismatches with less inlining
 779ifdef CONFIG_DEBUG_SECTION_MISMATCH
 780KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 781endif
 782
 783ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 784KBUILD_CFLAGS   += $(call cc-option,-ffunction-sections,)
 785KBUILD_CFLAGS   += $(call cc-option,-fdata-sections,)
 786endif
 787
 788# arch Makefile may override CC so keep this after arch Makefile is included
 789NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
 790CHECKFLAGS     += $(NOSTDINC_FLAGS)
 791
 792# warn about C99 declaration after statement
 793KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 794
 795# disable pointer signed / unsigned warnings in gcc 4.0
 796KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 797
 798# disable invalid "can't wrap" optimizations for signed / pointers
 799KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 800
 801# clang sets -fmerge-all-constants by default as optimization, but this
 802# is non-conforming behavior for C and in fact breaks the kernel, so we
 803# need to disable it here generally.
 804KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 805
 806# for gcc -fno-merge-all-constants disables everything, but it is fine
 807# to have actual conforming behavior enabled.
 808KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 809
 810# Make sure -fstack-check isn't enabled (like gentoo apparently did)
 811KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 812
 813# conserve stack if available
 814KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 815
 816# disallow errors like 'EXPORT_GPL(foo);' with missing header
 817KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 818
 819# require functions to have arguments in prototypes, not empty 'int foo()'
 820KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 821
 822# Prohibit date/time macros, which would make the build non-deterministic
 823KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 824
 825# enforce correct pointer usage
 826KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 827
 828# Require designated initializers for all marked structures
 829KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 830
 831# use the deterministic mode of AR if available
 832KBUILD_ARFLAGS := $(call ar-option,D)
 833
 834include scripts/Makefile.kasan
 835include scripts/Makefile.extrawarn
 836include scripts/Makefile.ubsan
 837
 838# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 839# last assignments
 840KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 841KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 842KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 843
 844# Use --build-id when available.
 845LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
 846                              $(call cc-ldoption, -Wl$(comma)--build-id,))
 847KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 848LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 849
 850ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 851LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
 852endif
 853
 854ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 855LDFLAGS_vmlinux += $(call ld-option, -X,)
 856endif
 857
 858# Default kernel image to build when no specific target is given.
 859# KBUILD_IMAGE may be overruled on the command line or
 860# set in the environment
 861# Also any assignments in arch/$(ARCH)/Makefile take precedence over
 862# this default value
 863export KBUILD_IMAGE ?= vmlinux
 864
 865#
 866# INSTALL_PATH specifies where to place the updated kernel and system map
 867# images. Default is /boot, but you can set it to other values
 868export  INSTALL_PATH ?= /boot
 869
 870#
 871# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 872# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 873# an argument if needed. Otherwise it defaults to the kernel install path
 874#
 875export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 876
 877#
 878# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 879# relocations required by build roots.  This is not defined in the
 880# makefile but the argument can be passed to make if needed.
 881#
 882
 883MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 884export MODLIB
 885
 886#
 887# INSTALL_MOD_STRIP, if defined, will cause modules to be
 888# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 889# the default option --strip-debug will be used.  Otherwise,
 890# INSTALL_MOD_STRIP value will be used as the options to the strip command.
 891
 892ifdef INSTALL_MOD_STRIP
 893ifeq ($(INSTALL_MOD_STRIP),1)
 894mod_strip_cmd = $(STRIP) --strip-debug
 895else
 896mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 897endif # INSTALL_MOD_STRIP=1
 898else
 899mod_strip_cmd = true
 900endif # INSTALL_MOD_STRIP
 901export mod_strip_cmd
 902
 903# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 904# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 905# or CONFIG_MODULE_COMPRESS_XZ.
 906
 907mod_compress_cmd = true
 908ifdef CONFIG_MODULE_COMPRESS
 909  ifdef CONFIG_MODULE_COMPRESS_GZIP
 910    mod_compress_cmd = gzip -n -f
 911  endif # CONFIG_MODULE_COMPRESS_GZIP
 912  ifdef CONFIG_MODULE_COMPRESS_XZ
 913    mod_compress_cmd = xz -f
 914  endif # CONFIG_MODULE_COMPRESS_XZ
 915endif # CONFIG_MODULE_COMPRESS
 916export mod_compress_cmd
 917
 918# Select initial ramdisk compression format, default is gzip(1).
 919# This shall be used by the dracut(8) tool while creating an initramfs image.
 920#
 921INITRD_COMPRESS-y                  := gzip
 922INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
 923INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
 924INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
 925INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
 926INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
 927# do not export INITRD_COMPRESS, since we didn't actually
 928# choose a sane default compression above.
 929# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
 930
 931ifdef CONFIG_MODULE_SIG_ALL
 932$(eval $(call config_filename,MODULE_SIG_KEY))
 933
 934mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 935else
 936mod_sign_cmd = true
 937endif
 938export mod_sign_cmd
 939
 940ifdef CONFIG_STACK_VALIDATION
 941  has_libelf := $(call try-run,\
 942                echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
 943  ifeq ($(has_libelf),1)
 944    objtool_target := tools/objtool FORCE
 945  else
 946    ifdef CONFIG_UNWINDER_ORC
 947      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 948    else
 949      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
 950    endif
 951    SKIP_STACK_VALIDATION := 1
 952    export SKIP_STACK_VALIDATION
 953  endif
 954endif
 955
 956
 957ifeq ($(KBUILD_EXTMOD),)
 958core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 959
 960vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 961                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 962                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
 963
 964vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
 965                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
 966
 967init-y          := $(patsubst %/, %/built-in.o, $(init-y))
 968core-y          := $(patsubst %/, %/built-in.o, $(core-y))
 969drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
 970net-y           := $(patsubst %/, %/built-in.o, $(net-y))
 971libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
 972libs-y2         := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
 973virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
 974
 975# Externally visible symbols (used by link-vmlinux.sh)
 976export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
 977export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
 978export KBUILD_VMLINUX_LIBS := $(libs-y1)
 979export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 980export LDFLAGS_vmlinux
 981# used by scripts/package/Makefile
 982export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
 983
 984vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
 985
 986# Include targets which we want to execute sequentially if the rest of the
 987# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
 988# evaluated more than once.
 989PHONY += vmlinux_prereq
 990vmlinux_prereq: $(vmlinux-deps) FORCE
 991ifdef CONFIG_HEADERS_CHECK
 992        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 993endif
 994ifdef CONFIG_GDB_SCRIPTS
 995        $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 996endif
 997ifdef CONFIG_TRIM_UNUSED_KSYMS
 998        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
 999          "$(MAKE) -f $(srctree)/Makefile vmlinux"
1000endif
1001
1002# standalone target for easier testing
1003include/generated/autoksyms.h: FORCE
1004        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1005
1006ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1007
1008# Final link of vmlinux with optional arch pass after final link
1009cmd_link-vmlinux =                                                 \
1010        $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1011        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1012
1013vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1014        +$(call if_changed,link-vmlinux)
1015
1016# Build samples along the rest of the kernel
1017ifdef CONFIG_SAMPLES
1018vmlinux-dirs += samples
1019endif
1020
1021# The actual objects are generated when descending,
1022# make sure no implicit rule kicks in
1023$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1024
1025# Handle descending into subdirectories listed in $(vmlinux-dirs)
1026# Preset locale variables to speed up the build process. Limit locale
1027# tweaks to this spot to avoid wrong language settings when running
1028# make menuconfig etc.
1029# Error messages still appears in the original language
1030
1031PHONY += $(vmlinux-dirs)
1032$(vmlinux-dirs): prepare scripts
1033        $(Q)$(MAKE) $(build)=$@ need-builtin=1
1034
1035define filechk_kernel.release
1036        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1037endef
1038
1039# Store (new) KERNELRELEASE string in include/config/kernel.release
1040include/config/kernel.release: include/config/auto.conf FORCE
1041        $(call filechk,kernel.release)
1042
1043
1044# Things we need to do before we recursively start building the kernel
1045# or the modules are listed in "prepare".
1046# A multi level approach is used. prepareN is processed before prepareN-1.
1047# archprepare is used in arch Makefiles and when processed asm symlink,
1048# version.h and scripts_basic is processed / created.
1049
1050# Listed in dependency order
1051PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1052
1053# prepare3 is used to check if we are building in a separate output directory,
1054# and if so do:
1055# 1) Check that make has not been executed in the kernel src $(srctree)
1056prepare3: include/config/kernel.release
1057ifneq ($(KBUILD_SRC),)
1058        @$(kecho) '  Using $(srctree) as source for kernel'
1059        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1060                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1061                echo >&2 "  in the '$(srctree)' directory.";\
1062                /bin/false; \
1063        fi;
1064endif
1065
1066# prepare2 creates a makefile if using a separate output directory.
1067# From this point forward, .config has been reprocessed, so any rules
1068# that need to depend on updated CONFIG_* values can be checked here.
1069prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1070
1071prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1072                   include/config/auto.conf
1073        $(cmd_crmodverdir)
1074
1075archprepare: archheaders archscripts prepare1 scripts_basic
1076
1077prepare0: archprepare gcc-plugins
1078        $(Q)$(MAKE) $(build)=.
1079
1080# All the preparing..
1081prepare: prepare0 prepare-objtool
1082
1083# Support for using generic headers in asm-generic
1084PHONY += asm-generic uapi-asm-generic
1085asm-generic: uapi-asm-generic
1086        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1087                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
1088uapi-asm-generic:
1089        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1090                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1091
1092PHONY += prepare-objtool
1093prepare-objtool: $(objtool_target)
1094
1095# Check for CONFIG flags that require compiler support. Abort the build
1096# after .config has been processed, but before the kernel build starts.
1097#
1098# For security-sensitive CONFIG options, we don't want to fallback and/or
1099# silently change which compiler flags will be used, since that leads to
1100# producing kernels with different security feature characteristics
1101# depending on the compiler used. (For example, "But I selected
1102# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1103PHONY += prepare-compiler-check
1104prepare-compiler-check: FORCE
1105# Make sure compiler supports requested stack protector flag.
1106ifdef stackp-name
1107  ifeq ($(call cc-option, $(stackp-flag)),)
1108        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1109                  $(stackp-flag) not supported by compiler >&2 && exit 1
1110  endif
1111endif
1112# Make sure compiler does not have buggy stack-protector support.
1113ifdef stackp-check
1114  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1115        @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1116                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1117  endif
1118endif
1119        @:
1120
1121# Generate some files
1122# ---------------------------------------------------------------------------
1123
1124# KERNELRELEASE can change from a few different places, meaning version.h
1125# needs to be updated, so this check is forced on all builds
1126
1127uts_len := 64
1128define filechk_utsrelease.h
1129        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1130          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1131          exit 1;                                                         \
1132        fi;                                                               \
1133        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1134endef
1135
1136define filechk_version.h
1137        (echo \#define LINUX_VERSION_CODE $(shell                         \
1138        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1139        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1140endef
1141
1142$(version_h): $(srctree)/Makefile FORCE
1143        $(call filechk,version.h)
1144        $(Q)rm -f $(old_version_h)
1145
1146include/generated/utsrelease.h: include/config/kernel.release FORCE
1147        $(call filechk,utsrelease.h)
1148
1149PHONY += headerdep
1150headerdep:
1151        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1152        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1153
1154# ---------------------------------------------------------------------------
1155# Kernel headers
1156
1157#Default location for installed headers
1158export INSTALL_HDR_PATH = $(objtree)/usr
1159
1160# If we do an all arch process set dst to include/arch-$(SRCARCH)
1161hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1162
1163PHONY += archheaders
1164archheaders:
1165
1166PHONY += archscripts
1167archscripts:
1168
1169PHONY += __headers
1170__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1171        $(Q)$(MAKE) $(build)=scripts build_unifdef
1172
1173PHONY += headers_install_all
1174headers_install_all:
1175        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1176
1177PHONY += headers_install
1178headers_install: __headers
1179        $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1180          $(error Headers not exportable for the $(SRCARCH) architecture))
1181        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1182        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1183
1184PHONY += headers_check_all
1185headers_check_all: headers_install_all
1186        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1187
1188PHONY += headers_check
1189headers_check: headers_install
1190        $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1191        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1192
1193# ---------------------------------------------------------------------------
1194# Kernel selftest
1195
1196PHONY += kselftest
1197kselftest:
1198        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1199
1200PHONY += kselftest-clean
1201kselftest-clean:
1202        $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1203
1204PHONY += kselftest-merge
1205kselftest-merge:
1206        $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1207        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1208                -m $(objtree)/.config \
1209                $(srctree)/tools/testing/selftests/*/config
1210        +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1211
1212# ---------------------------------------------------------------------------
1213# Modules
1214
1215ifdef CONFIG_MODULES
1216
1217# By default, build modules as well
1218
1219all: modules
1220
1221# Build modules
1222#
1223# A module can be listed more than once in obj-m resulting in
1224# duplicate lines in modules.order files.  Those are removed
1225# using awk while concatenating to the final file.
1226
1227PHONY += modules
1228modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1229        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1230        @$(kecho) '  Building modules, stage 2.';
1231        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1232
1233modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1234        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1235
1236%/modules.builtin: include/config/auto.conf
1237        $(Q)$(MAKE) $(modbuiltin)=$*
1238
1239
1240# Target to prepare building external modules
1241PHONY += modules_prepare
1242modules_prepare: prepare scripts
1243
1244# Target to install modules
1245PHONY += modules_install
1246modules_install: _modinst_ _modinst_post
1247
1248PHONY += _modinst_
1249_modinst_:
1250        @rm -rf $(MODLIB)/kernel
1251        @rm -f $(MODLIB)/source
1252        @mkdir -p $(MODLIB)/kernel
1253        @ln -s $(abspath $(srctree)) $(MODLIB)/source
1254        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1255                rm -f $(MODLIB)/build ; \
1256                ln -s $(CURDIR) $(MODLIB)/build ; \
1257        fi
1258        @cp -f $(objtree)/modules.order $(MODLIB)/
1259        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1260        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1261
1262# This depmod is only for convenience to give the initial
1263# boot a modules.dep even before / is mounted read-write.  However the
1264# boot script depmod is the master version.
1265PHONY += _modinst_post
1266_modinst_post: _modinst_
1267        $(call cmd,depmod)
1268
1269ifeq ($(CONFIG_MODULE_SIG), y)
1270PHONY += modules_sign
1271modules_sign:
1272        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1273endif
1274
1275else # CONFIG_MODULES
1276
1277# Modules not configured
1278# ---------------------------------------------------------------------------
1279
1280PHONY += modules modules_install
1281modules modules_install:
1282        @echo >&2
1283        @echo >&2 "The present kernel configuration has modules disabled."
1284        @echo >&2 "Type 'make config' and enable loadable module support."
1285        @echo >&2 "Then build a kernel with module support enabled."
1286        @echo >&2
1287        @exit 1
1288
1289endif # CONFIG_MODULES
1290
1291###
1292# Cleaning is done on three levels.
1293# make clean     Delete most generated files
1294#                Leave enough to build external modules
1295# make mrproper  Delete the current configuration, and all generated files
1296# make distclean Remove editor backup files, patch leftover files and the like
1297
1298# Directories & files removed with 'make clean'
1299CLEAN_DIRS  += $(MODVERDIR)
1300
1301# Directories & files removed with 'make mrproper'
1302MRPROPER_DIRS  += include/config usr/include include/generated          \
1303                  arch/*/include/generated .tmp_objdiff
1304MRPROPER_FILES += .config .config.old .version \
1305                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1306                  signing_key.pem signing_key.priv signing_key.x509     \
1307                  x509.genkey extra_certificates signing_key.x509.keyid \
1308                  signing_key.x509.signer vmlinux-gdb.py
1309
1310# clean - Delete most, but leave enough to build external modules
1311#
1312clean: rm-dirs  := $(CLEAN_DIRS)
1313clean: rm-files := $(CLEAN_FILES)
1314clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1315
1316PHONY += $(clean-dirs) clean archclean vmlinuxclean
1317$(clean-dirs):
1318        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1319
1320vmlinuxclean:
1321        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1322        $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1323
1324clean: archclean vmlinuxclean
1325
1326# mrproper - Delete all generated files, including .config
1327#
1328mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1329mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1330mrproper-dirs      := $(addprefix _mrproper_,scripts)
1331
1332PHONY += $(mrproper-dirs) mrproper archmrproper
1333$(mrproper-dirs):
1334        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1335
1336mrproper: clean archmrproper $(mrproper-dirs)
1337        $(call cmd,rmdirs)
1338        $(call cmd,rmfiles)
1339
1340# distclean
1341#
1342PHONY += distclean
1343
1344distclean: mrproper
1345        @find $(srctree) $(RCS_FIND_IGNORE) \
1346                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1347                -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1348                -o -name 'core' \) \
1349                -type f -print | xargs rm -f
1350
1351
1352# Packaging of the kernel to various formats
1353# ---------------------------------------------------------------------------
1354# rpm target kept for backward compatibility
1355package-dir     := scripts/package
1356
1357%src-pkg: FORCE
1358        $(Q)$(MAKE) $(build)=$(package-dir) $@
1359%pkg: include/config/kernel.release FORCE
1360        $(Q)$(MAKE) $(build)=$(package-dir) $@
1361rpm: rpm-pkg
1362        @echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1363        @echo "           Please use \"rpm-pkg\" instead."
1364
1365
1366# Brief documentation of the typical targets used
1367# ---------------------------------------------------------------------------
1368
1369boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1370boards := $(sort $(notdir $(boards)))
1371board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1372board-dirs := $(sort $(notdir $(board-dirs:/=)))
1373
1374PHONY += help
1375help:
1376        @echo  'Cleaning targets:'
1377        @echo  '  clean           - Remove most generated files but keep the config and'
1378        @echo  '                    enough build support to build external modules'
1379        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1380        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1381        @echo  ''
1382        @echo  'Configuration targets:'
1383        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1384        @echo  ''
1385        @echo  'Other generic targets:'
1386        @echo  '  all             - Build all targets marked with [*]'
1387        @echo  '* vmlinux         - Build the bare kernel'
1388        @echo  '* modules         - Build all modules'
1389        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1390        @echo  '  dir/            - Build all files in dir and below'
1391        @echo  '  dir/file.[ois]  - Build specified target only'
1392        @echo  '  dir/file.ll     - Build the LLVM assembly file'
1393        @echo  '                    (requires compiler support for LLVM assembly generation)'
1394        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1395        @echo  '                    (requires a recent binutils and recent build (System.map))'
1396        @echo  '  dir/file.ko     - Build module including final link'
1397        @echo  '  modules_prepare - Set up for building external modules'
1398        @echo  '  tags/TAGS       - Generate tags file for editors'
1399        @echo  '  cscope          - Generate cscope index'
1400        @echo  '  gtags           - Generate GNU GLOBAL index'
1401        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1402        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1403        @echo  '  image_name      - Output the image name (use with make -s)'
1404        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1405         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1406         echo  ''
1407        @echo  'Static analysers:'
1408        @echo  '  checkstack      - Generate a list of stack hogs'
1409        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1410        @echo  '  versioncheck    - Sanity check on version.h usage'
1411        @echo  '  includecheck    - Check for duplicate included header files'
1412        @echo  '  export_report   - List the usages of all exported symbols'
1413        @echo  '  headers_check   - Sanity check on exported headers'
1414        @echo  '  headerdep       - Detect inclusion cycles in headers'
1415        @echo  '  coccicheck      - Check with Coccinelle'
1416        @echo  ''
1417        @echo  'Kernel selftest:'
1418        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1419        @echo  '                    Build, install, and boot kernel before'
1420        @echo  '                    running kselftest on it'
1421        @echo  '  kselftest-clean - Remove all generated kselftest files'
1422        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1423        @echo  '                    .config.'
1424        @echo  ''
1425        @echo 'Userspace tools targets:'
1426        @echo '  use "make tools/help"'
1427        @echo '  or  "cd tools; make help"'
1428        @echo  ''
1429        @echo  'Kernel packaging:'
1430        @$(MAKE) $(build)=$(package-dir) help
1431        @echo  ''
1432        @echo  'Documentation targets:'
1433        @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1434        @echo  ''
1435        @echo  'Architecture specific targets ($(SRCARCH)):'
1436        @$(if $(archhelp),$(archhelp),\
1437                echo '  No architecture specific help defined for $(SRCARCH)')
1438        @echo  ''
1439        @$(if $(boards), \
1440                $(foreach b, $(boards), \
1441                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1442                echo '')
1443        @$(if $(board-dirs), \
1444                $(foreach b, $(board-dirs), \
1445                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1446                printf "  %-16s - Show all of the above\\n" help-boards; \
1447                echo '')
1448
1449        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1450        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1451        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1452        @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1453        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1454        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1455        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1456        @echo  '                1: warnings which may be relevant and do not occur too often'
1457        @echo  '                2: warnings which occur quite often but may still be relevant'
1458        @echo  '                3: more obscure warnings, can most likely be ignored'
1459        @echo  '                Multiple levels can be combined with W=12 or W=123'
1460        @echo  ''
1461        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1462        @echo  'For further info see the ./README file'
1463
1464
1465help-board-dirs := $(addprefix help-,$(board-dirs))
1466
1467help-boards: $(help-board-dirs)
1468
1469boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1470
1471$(help-board-dirs): help-%:
1472        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1473        @$(if $(boards-per-dir), \
1474                $(foreach b, $(boards-per-dir), \
1475                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1476                echo '')
1477
1478
1479# Documentation targets
1480# ---------------------------------------------------------------------------
1481DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1482               linkcheckdocs dochelp refcheckdocs
1483PHONY += $(DOC_TARGETS)
1484$(DOC_TARGETS): scripts_basic FORCE
1485        $(Q)$(MAKE) $(build)=Documentation $@
1486
1487else # KBUILD_EXTMOD
1488
1489###
1490# External module support.
1491# When building external modules the kernel used as basis is considered
1492# read-only, and no consistency checks are made and the make
1493# system is not used on the basis kernel. If updates are required
1494# in the basis kernel ordinary make commands (without M=...) must
1495# be used.
1496#
1497# The following are the only valid targets when building external
1498# modules.
1499# make M=dir clean     Delete all automatically generated files
1500# make M=dir modules   Make all modules in specified dir
1501# make M=dir           Same as 'make M=dir modules'
1502# make M=dir modules_install
1503#                      Install the modules built in the module directory
1504#                      Assumes install directory is already created
1505
1506# We are always building modules
1507KBUILD_MODULES := 1
1508PHONY += crmodverdir
1509crmodverdir:
1510        $(cmd_crmodverdir)
1511
1512PHONY += $(objtree)/Module.symvers
1513$(objtree)/Module.symvers:
1514        @test -e $(objtree)/Module.symvers || ( \
1515        echo; \
1516        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1517        echo "           is missing; modules will have no dependencies and modversions."; \
1518        echo )
1519
1520module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1521PHONY += $(module-dirs) modules
1522$(module-dirs): crmodverdir $(objtree)/Module.symvers
1523        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1524
1525modules: $(module-dirs)
1526        @$(kecho) '  Building modules, stage 2.';
1527        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1528
1529PHONY += modules_install
1530modules_install: _emodinst_ _emodinst_post
1531
1532install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1533PHONY += _emodinst_
1534_emodinst_:
1535        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1536        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1537
1538PHONY += _emodinst_post
1539_emodinst_post: _emodinst_
1540        $(call cmd,depmod)
1541
1542clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1543
1544PHONY += $(clean-dirs) clean
1545$(clean-dirs):
1546        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1547
1548clean:  rm-dirs := $(MODVERDIR)
1549clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1550
1551PHONY += help
1552help:
1553        @echo  '  Building external modules.'
1554        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1555        @echo  ''
1556        @echo  '  modules         - default target, build the module(s)'
1557        @echo  '  modules_install - install the module'
1558        @echo  '  clean           - remove generated files in module directory only'
1559        @echo  ''
1560
1561# Dummies...
1562PHONY += prepare scripts
1563prepare: ;
1564scripts: ;
1565endif # KBUILD_EXTMOD
1566
1567clean: $(clean-dirs)
1568        $(call cmd,rmdirs)
1569        $(call cmd,rmfiles)
1570        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1571                \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1572                -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1573                -o -name '*.dwo' -o -name '*.lst' \
1574                -o -name '*.su'  \
1575                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1576                -o -name '*.symtypes' -o -name 'modules.order' \
1577                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1578                -o -name .cache.mk \
1579                -o -name '*.c.[012]*.*' \
1580                -o -name '*.ll' \
1581                -o -name '*.gcno' \) -type f -print | xargs rm -f
1582
1583# Generate tags for editors
1584# ---------------------------------------------------------------------------
1585quiet_cmd_tags = GEN     $@
1586      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1587
1588tags TAGS cscope gtags: FORCE
1589        $(call cmd,tags)
1590
1591# Scripts to check various things for consistency
1592# ---------------------------------------------------------------------------
1593
1594PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1595
1596includecheck:
1597        find $(srctree)/* $(RCS_FIND_IGNORE) \
1598                -name '*.[hcS]' -type f -print | sort \
1599                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1600
1601versioncheck:
1602        find $(srctree)/* $(RCS_FIND_IGNORE) \
1603                -name '*.[hcS]' -type f -print | sort \
1604                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1605
1606coccicheck:
1607        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1608
1609namespacecheck:
1610        $(PERL) $(srctree)/scripts/namespace.pl
1611
1612export_report:
1613        $(PERL) $(srctree)/scripts/export_report.pl
1614
1615endif #ifeq ($(config-targets),1)
1616endif #ifeq ($(mixed-targets),1)
1617
1618PHONY += checkstack kernelrelease kernelversion image_name
1619
1620# UML needs a little special treatment here.  It wants to use the host
1621# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1622# else wants $(ARCH), including people doing cross-builds, which means
1623# that $(SUBARCH) doesn't work here.
1624ifeq ($(ARCH), um)
1625CHECKSTACK_ARCH := $(SUBARCH)
1626else
1627CHECKSTACK_ARCH := $(ARCH)
1628endif
1629checkstack:
1630        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1631        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1632
1633kernelrelease:
1634        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1635
1636kernelversion:
1637        @echo $(KERNELVERSION)
1638
1639image_name:
1640        @echo $(KBUILD_IMAGE)
1641
1642# Clear a bunch of variables before executing the submake
1643tools/: FORCE
1644        $(Q)mkdir -p $(objtree)/tools
1645        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1646
1647tools/%: FORCE
1648        $(Q)mkdir -p $(objtree)/tools
1649        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1650
1651# Single targets
1652# ---------------------------------------------------------------------------
1653# Single targets are compatible with:
1654# - build with mixed source and output
1655# - build with separate output dir 'make O=...'
1656# - external modules
1657#
1658#  target-dir => where to store outputfile
1659#  build-dir  => directory in kernel source tree to use
1660
1661ifeq ($(KBUILD_EXTMOD),)
1662        build-dir  = $(patsubst %/,%,$(dir $@))
1663        target-dir = $(dir $@)
1664else
1665        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1666        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1667        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1668endif
1669
1670%.s: %.c prepare scripts FORCE
1671        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1672%.i: %.c prepare scripts FORCE
1673        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1674%.o: %.c prepare scripts FORCE
1675        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1676%.lst: %.c prepare scripts FORCE
1677        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1678%.s: %.S prepare scripts FORCE
1679        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1680%.o: %.S prepare scripts FORCE
1681        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1682%.symtypes: %.c prepare scripts FORCE
1683        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1684%.ll: %.c prepare scripts FORCE
1685        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1686
1687# Modules
1688/: prepare scripts FORCE
1689        $(cmd_crmodverdir)
1690        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1691        $(build)=$(build-dir)
1692# Make sure the latest headers are built for Documentation
1693Documentation/ samples/: headers_install
1694%/: prepare scripts FORCE
1695        $(cmd_crmodverdir)
1696        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1697        $(build)=$(build-dir)
1698%.ko: prepare scripts FORCE
1699        $(cmd_crmodverdir)
1700        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1701        $(build)=$(build-dir) $(@:.ko=.o)
1702        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1703
1704# FIXME Should go into a make.lib or something
1705# ===========================================================================
1706
1707quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1708      cmd_rmdirs = rm -rf $(rm-dirs)
1709
1710quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1711      cmd_rmfiles = rm -f $(rm-files)
1712
1713# Run depmod only if we have System.map and depmod is executable
1714quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1715      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1716                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1717
1718# Create temporary dir for module support files
1719# clean it up only when building all modules
1720cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1721                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1722
1723# read all saved command lines
1724
1725cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1726
1727ifneq ($(cmd_files),)
1728  $(cmd_files): ;       # Do not try to update included dependency files
1729  include $(cmd_files)
1730endif
1731
1732endif   # skip-makefile
1733
1734PHONY += FORCE
1735FORCE:
1736
1737# Declare the contents of the .PHONY variable as phony.  We keep that
1738# information in a variable so we can use it in if_changed and friends.
1739.PHONY: $(PHONY)
1740
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