1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Shy Crocodile 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# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# 72# To put more focus on warnings, be less verbose as default 73# Use 'make V=1' to see the full commands 74 75ifeq ("$(origin V)", "command line") 76 KBUILD_VERBOSE = $(V) 77endif 78ifndef KBUILD_VERBOSE 79 KBUILD_VERBOSE = 0 80endif 81 82ifeq ($(KBUILD_VERBOSE),1) 83 quiet = 84 Q = 85else 86 quiet=quiet_ 87 Q = @ 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92 93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 quiet=silent_ 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123ifneq ($(words $(subst :, ,$(CURDIR))), 1) 124 $(error main directory cannot contain spaces nor colons) 125endif 126 127ifneq ($(KBUILD_OUTPUT),) 128# check that the output directory actually exists 129saved-output := $(KBUILD_OUTPUT) 130KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 131 && pwd) 132$(if $(KBUILD_OUTPUT),, \ 133 $(error failed to create output directory "$(saved-output)")) 134 135# Look for make include files relative to root of kernel src 136# 137# This does not become effective immediately because MAKEFLAGS is re-parsed 138# once after the Makefile is read. It is OK since we are going to invoke 139# 'sub-make' below. 140MAKEFLAGS += --include-dir=$(CURDIR) 141 142need-sub-make := 1 143else 144 145# Do not print "Entering directory ..." at all for in-tree build. 146MAKEFLAGS += --no-print-directory 147 148endif # ifneq ($(KBUILD_OUTPUT),) 149 150ifneq ($(filter 3.%,$(MAKE_VERSION)),) 151# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 152# We need to invoke sub-make to avoid implicit rules in the top Makefile. 153need-sub-make := 1 154# Cancel implicit rules for this Makefile. 155$(lastword $(MAKEFILE_LIST)): ; 156endif 157 158export sub_make_done := 1 159 160ifeq ($(need-sub-make),1) 161 162PHONY += $(MAKECMDGOALS) sub-make 163 164$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 165 @: 166 167# Invoke a second make in the output directory, passing relevant variables 168sub-make: 169 $(Q)$(MAKE) \ 170 $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \ 171 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 172 173endif # need-sub-make 174endif # sub_make_done 175 176# We process the rest of the Makefile if this is the final invocation of make 177ifeq ($(need-sub-make),) 178 179# Do not print "Entering directory ...", 180# but we want to display it when entering to the output directory 181# so that IDEs/editors are able to understand relative filenames. 182MAKEFLAGS += --no-print-directory 183 184# Call a source code checker (by default, "sparse") as part of the 185# C compilation. 186# 187# Use 'make C=1' to enable checking of only re-compiled files. 188# Use 'make C=2' to enable checking of *all* source files, regardless 189# of whether they are re-compiled or not. 190# 191# See the file "Documentation/dev-tools/sparse.rst" for more details, 192# including where to get the "sparse" utility. 193 194ifeq ("$(origin C)", "command line") 195 KBUILD_CHECKSRC = $(C) 196endif 197ifndef KBUILD_CHECKSRC 198 KBUILD_CHECKSRC = 0 199endif 200 201# Use make M=dir to specify directory of external module to build 202# Old syntax make ... SUBDIRS=$PWD is still supported 203# Setting the environment variable KBUILD_EXTMOD take precedence 204ifdef SUBDIRS 205 $(warning ================= WARNING ================) 206 $(warning 'SUBDIRS' will be removed after Linux 5.3) 207 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 208 $(warning ==========================================) 209 KBUILD_EXTMOD ?= $(SUBDIRS) 210endif 211 212ifeq ("$(origin M)", "command line") 213 KBUILD_EXTMOD := $(M) 214endif 215 216ifeq ($(KBUILD_SRC),) 217 # building in the source tree 218 srctree := . 219else 220 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 221 # building in a subdirectory of the source tree 222 srctree := .. 223 else 224 srctree := $(KBUILD_SRC) 225 endif 226endif 227 228export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 229 230objtree := . 231src := $(srctree) 232obj := $(objtree) 233 234VPATH := $(srctree) 235 236export srctree objtree VPATH 237 238# To make sure we do not include .config for any of the *config targets 239# catch them early, and hand them over to scripts/kconfig/Makefile 240# It is allowed to specify more targets when calling make, including 241# mixing *config targets and build targets. 242# For example 'make oldconfig all'. 243# Detect when mixed targets is specified, and make a second invocation 244# of make so .config is not included in this case either (for *config). 245 246version_h := include/generated/uapi/linux/version.h 247old_version_h := include/linux/version.h 248 249clean-targets := %clean mrproper cleandocs 250no-dot-config-targets := $(clean-targets) \ 251 cscope gtags TAGS tags help% %docs check% coccicheck \ 252 $(version_h) headers_% archheaders archscripts \ 253 %asm-generic kernelversion %src-pkg 254no-sync-config-targets := $(no-dot-config-targets) install %install \ 255 kernelrelease 256 257config-targets := 0 258mixed-targets := 0 259dot-config := 1 260may-sync-config := 1 261 262ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 263 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 264 dot-config := 0 265 endif 266endif 267 268ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 269 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 270 may-sync-config := 0 271 endif 272endif 273 274ifneq ($(KBUILD_EXTMOD),) 275 may-sync-config := 0 276endif 277 278ifeq ($(KBUILD_EXTMOD),) 279 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 280 config-targets := 1 281 ifneq ($(words $(MAKECMDGOALS)),1) 282 mixed-targets := 1 283 endif 284 endif 285endif 286 287# For "make -j clean all", "make -j mrproper defconfig all", etc. 288ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 289 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 290 mixed-targets := 1 291 endif 292endif 293 294# install and modules_install need also be processed one by one 295ifneq ($(filter install,$(MAKECMDGOALS)),) 296 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 297 mixed-targets := 1 298 endif 299endif 300 301ifeq ($(mixed-targets),1) 302# =========================================================================== 303# We're called with mixed targets (*config and build targets). 304# Handle them one by one. 305 306PHONY += $(MAKECMDGOALS) __build_one_by_one 307 308$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 309 @: 310 311__build_one_by_one: 312 $(Q)set -e; \ 313 for i in $(MAKECMDGOALS); do \ 314 $(MAKE) -f $(srctree)/Makefile $$i; \ 315 done 316 317else 318 319include scripts/Kbuild.include 320 321# Read KERNELRELEASE from include/config/kernel.release (if it exists) 322KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 323KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 324export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 325 326include scripts/subarch.include 327 328# Cross compiling and selecting different set of gcc/bin-utils 329# --------------------------------------------------------------------------- 330# 331# When performing cross compilation for other architectures ARCH shall be set 332# to the target architecture. (See arch/* for the possibilities). 333# ARCH can be set during invocation of make: 334# make ARCH=ia64 335# Another way is to have ARCH set in the environment. 336# The default ARCH is the host where make is executed. 337 338# CROSS_COMPILE specify the prefix used for all executables used 339# during compilation. Only gcc and related bin-utils executables 340# are prefixed with $(CROSS_COMPILE). 341# CROSS_COMPILE can be set on the command line 342# make CROSS_COMPILE=ia64-linux- 343# Alternatively CROSS_COMPILE can be set in the environment. 344# Default value for CROSS_COMPILE is not to prefix executables 345# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 346ARCH ?= $(SUBARCH) 347 348# Architecture as present in compile.h 349UTS_MACHINE := $(ARCH) 350SRCARCH := $(ARCH) 351 352# Additional ARCH settings for x86 353ifeq ($(ARCH),i386) 354 SRCARCH := x86 355endif 356ifeq ($(ARCH),x86_64) 357 SRCARCH := x86 358endif 359 360# Additional ARCH settings for sparc 361ifeq ($(ARCH),sparc32) 362 SRCARCH := sparc 363endif 364ifeq ($(ARCH),sparc64) 365 SRCARCH := sparc 366endif 367 368# Additional ARCH settings for sh 369ifeq ($(ARCH),sh64) 370 SRCARCH := sh 371endif 372 373KCONFIG_CONFIG ?= .config 374export KCONFIG_CONFIG 375 376# SHELL used by kbuild 377CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 378 else if [ -x /bin/bash ]; then echo /bin/bash; \ 379 else echo sh; fi ; fi) 380 381HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 382HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 383HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 384 385HOSTCC = gcc 386HOSTCXX = g++ 387KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 388 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 389 $(HOSTCFLAGS) 390KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 391KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 392KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 393 394# Make variables (CC, etc...) 395AS = $(CROSS_COMPILE)as 396LD = $(CROSS_COMPILE)ld 397CC = $(CROSS_COMPILE)gcc 398CPP = $(CC) -E 399AR = $(CROSS_COMPILE)ar 400NM = $(CROSS_COMPILE)nm 401STRIP = $(CROSS_COMPILE)strip 402OBJCOPY = $(CROSS_COMPILE)objcopy 403OBJDUMP = $(CROSS_COMPILE)objdump 404PAHOLE = pahole 405LEX = flex 406YACC = bison 407AWK = awk 408INSTALLKERNEL := installkernel 409DEPMOD = /sbin/depmod 410PERL = perl 411PYTHON = python 412PYTHON2 = python2 413PYTHON3 = python3 414CHECK = sparse 415 416CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 417 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 418NOSTDINC_FLAGS := 419CFLAGS_MODULE = 420AFLAGS_MODULE = 421LDFLAGS_MODULE = 422CFLAGS_KERNEL = 423AFLAGS_KERNEL = 424LDFLAGS_vmlinux = 425 426# Use USERINCLUDE when you must reference the UAPI directories only. 427USERINCLUDE := \ 428 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 429 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 430 -I$(srctree)/include/uapi \ 431 -I$(objtree)/include/generated/uapi \ 432 -include $(srctree)/include/linux/kconfig.h 433 434# Use LINUXINCLUDE when you must reference the include/ directory. 435# Needed to be compatible with the O= option 436LINUXINCLUDE := \ 437 -I$(srctree)/arch/$(SRCARCH)/include \ 438 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 439 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 440 -I$(objtree)/include \ 441 $(USERINCLUDE) 442 443KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 444KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 445 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 446 -Werror=implicit-function-declaration -Werror=implicit-int \ 447 -Wno-format-security \ 448 -std=gnu89 449KBUILD_CPPFLAGS := -D__KERNEL__ 450KBUILD_AFLAGS_KERNEL := 451KBUILD_CFLAGS_KERNEL := 452KBUILD_AFLAGS_MODULE := -DMODULE 453KBUILD_CFLAGS_MODULE := -DMODULE 454KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 455KBUILD_LDFLAGS := 456GCC_PLUGINS_CFLAGS := 457 458export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 459export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 460export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 461export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 462 463export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 464export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 465export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 466export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 467export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 468export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 469export KBUILD_ARFLAGS 470 471# When compiling out-of-tree modules, put MODVERDIR in the module 472# tree rather than in the kernel tree. The kernel tree might 473# even be read-only. 474export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 475 476# Files to ignore in find ... statements 477 478export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 479 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 480 -prune -o 481export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 482 --exclude CVS --exclude .pc --exclude .hg --exclude .git 483 484# =========================================================================== 485# Rules shared between *config targets and build targets 486 487# Basic helpers built in scripts/basic/ 488PHONY += scripts_basic 489scripts_basic: 490 $(Q)$(MAKE) $(build)=scripts/basic 491 $(Q)rm -f .tmp_quiet_recordmcount 492 493PHONY += outputmakefile 494# outputmakefile generates a Makefile in the output directory, if using a 495# separate output directory. This allows convenient use of make in the 496# output directory. 497# At the same time when output Makefile generated, generate .gitignore to 498# ignore whole output directory 499outputmakefile: 500ifneq ($(KBUILD_SRC),) 501 $(Q)ln -fsn $(srctree) source 502 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 503 $(Q)test -e .gitignore || \ 504 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 505endif 506 507ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 508ifneq ($(CROSS_COMPILE),) 509CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 510GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 511CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 512GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 513endif 514ifneq ($(GCC_TOOLCHAIN),) 515CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 516endif 517CLANG_FLAGS += -no-integrated-as 518KBUILD_CFLAGS += $(CLANG_FLAGS) 519KBUILD_AFLAGS += $(CLANG_FLAGS) 520export CLANG_FLAGS 521endif 522 523RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 524RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 525RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 526RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 527RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 528RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 529export RETPOLINE_CFLAGS 530export RETPOLINE_VDSO_CFLAGS 531 532# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 533# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 534# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 535# and from include/config/auto.conf.cmd to detect the compiler upgrade. 536CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 537 538ifeq ($(config-targets),1) 539# =========================================================================== 540# *config targets only - make sure prerequisites are updated, and descend 541# in scripts/kconfig to make the *config target 542 543# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 544# KBUILD_DEFCONFIG may point out an alternative default configuration 545# used for 'make defconfig' 546include arch/$(SRCARCH)/Makefile 547export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 548 549config: scripts_basic outputmakefile FORCE 550 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 551 552%config: scripts_basic outputmakefile FORCE 553 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 554 555else 556# =========================================================================== 557# Build targets only - this includes vmlinux, arch specific targets, clean 558# targets and others. In general all targets except *config targets. 559 560# If building an external module we do not care about the all: rule 561# but instead _all depend on modules 562PHONY += all 563ifeq ($(KBUILD_EXTMOD),) 564_all: all 565else 566_all: modules 567endif 568 569# Decide whether to build built-in, modular, or both. 570# Normally, just do built-in. 571 572KBUILD_MODULES := 573KBUILD_BUILTIN := 1 574 575# If we have only "make modules", don't compile built-in objects. 576# When we're building modules with modversions, we need to consider 577# the built-in objects during the descend as well, in order to 578# make sure the checksums are up to date before we record them. 579 580ifeq ($(MAKECMDGOALS),modules) 581 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 582endif 583 584# If we have "make <whatever> modules", compile modules 585# in addition to whatever we do anyway. 586# Just "make" or "make all" shall build modules as well 587 588ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 589 KBUILD_MODULES := 1 590endif 591 592ifeq ($(MAKECMDGOALS),) 593 KBUILD_MODULES := 1 594endif 595 596export KBUILD_MODULES KBUILD_BUILTIN 597 598ifeq ($(KBUILD_EXTMOD),) 599# Objects we will link into vmlinux / subdirs we need to visit 600init-y := init/ 601drivers-y := drivers/ sound/ 602net-y := net/ 603libs-y := lib/ 604core-y := usr/ 605virt-y := virt/ 606endif # KBUILD_EXTMOD 607 608ifeq ($(dot-config),1) 609include include/config/auto.conf 610endif 611 612# The all: target is the default when no target is given on the 613# command line. 614# This allow a user to issue only 'make' to build a kernel including modules 615# Defaults to vmlinux, but the arch makefile usually adds further targets 616all: vmlinux 617 618CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 619 $(call cc-option,-fno-tree-loop-im) \ 620 $(call cc-disable-warning,maybe-uninitialized,) 621export CFLAGS_GCOV 622 623# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 624ifdef CONFIG_FUNCTION_TRACER 625 CC_FLAGS_FTRACE := -pg 626endif 627 628# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 629# values of the respective KBUILD_* variables 630ARCH_CPPFLAGS := 631ARCH_AFLAGS := 632ARCH_CFLAGS := 633include arch/$(SRCARCH)/Makefile 634 635ifeq ($(dot-config),1) 636ifeq ($(may-sync-config),1) 637# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 638# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 639# because some architectures define CROSS_COMPILE there. 640-include include/config/auto.conf.cmd 641 642$(KCONFIG_CONFIG): 643 @echo >&2 '***' 644 @echo >&2 '*** Configuration file "$@" not found!' 645 @echo >&2 '***' 646 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 647 @echo >&2 '*** "make menuconfig" or "make xconfig").' 648 @echo >&2 '***' 649 @/bin/false 650 651# The actual configuration files used during the build are stored in 652# include/generated/ and include/config/. Update them if .config is newer than 653# include/config/auto.conf (which mirrors .config). 654# 655# This exploits the 'multi-target pattern rule' trick. 656# The syncconfig should be executed only once to make all the targets. 657%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 658 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 659else 660# External modules and some install targets need include/generated/autoconf.h 661# and include/config/auto.conf but do not care if they are up-to-date. 662# Use auto.conf to trigger the test 663PHONY += include/config/auto.conf 664 665include/config/auto.conf: 666 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 667 echo >&2; \ 668 echo >&2 " ERROR: Kernel configuration is invalid."; \ 669 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 670 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 671 echo >&2 ; \ 672 /bin/false) 673 674endif # may-sync-config 675endif # $(dot-config) 676 677KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 678KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 679KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 680KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 681KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 682 683ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 684KBUILD_CFLAGS += -Os 685else 686KBUILD_CFLAGS += -O2 687endif 688 689ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 690KBUILD_CFLAGS += -Wno-maybe-uninitialized 691endif 692 693# Tell gcc to never replace conditional load with a non-conditional one 694KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 695 696include scripts/Makefile.kcov 697include scripts/Makefile.gcc-plugins 698 699ifdef CONFIG_READABLE_ASM 700# Disable optimizations that make assembler listings hard to read. 701# reorder blocks reorders the control in the function 702# ipa clone creates specialized cloned functions 703# partial inlining inlines only parts of functions 704KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 705 $(call cc-option,-fno-ipa-cp-clone,) \ 706 $(call cc-option,-fno-partial-inlining) 707endif 708 709ifneq ($(CONFIG_FRAME_WARN),0) 710KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 711endif 712 713stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 714stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 715stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 716 717KBUILD_CFLAGS += $(stackp-flags-y) 718 719ifdef CONFIG_CC_IS_CLANG 720KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 721KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 722KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 723KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 724# Quiet clang warning: comparison of unsigned expression < 0 is always false 725KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 726# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 727# source of a reference will be _MergedGlobals and not on of the whitelisted names. 728# See modpost pattern 2 729KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 730KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 731else 732 733# These warnings generated too much noise in a regular build. 734# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 735KBUILD_CFLAGS += -Wno-unused-but-set-variable 736endif 737 738KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 739ifdef CONFIG_FRAME_POINTER 740KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 741else 742# Some targets (ARM with Thumb2, for example), can't be built with frame 743# pointers. For those, we don't have FUNCTION_TRACER automatically 744# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 745# incompatible with -fomit-frame-pointer with current GCC, so we don't use 746# -fomit-frame-pointer with FUNCTION_TRACER. 747ifndef CONFIG_FUNCTION_TRACER 748KBUILD_CFLAGS += -fomit-frame-pointer 749endif 750endif 751 752DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 753 754ifdef CONFIG_DEBUG_INFO 755ifdef CONFIG_DEBUG_INFO_SPLIT 756DEBUG_CFLAGS += -gsplit-dwarf 757else 758DEBUG_CFLAGS += -g 759endif 760KBUILD_AFLAGS += -Wa,-gdwarf-2 761endif 762ifdef CONFIG_DEBUG_INFO_DWARF4 763DEBUG_CFLAGS += -gdwarf-4 764endif 765 766ifdef CONFIG_DEBUG_INFO_REDUCED 767DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 768 $(call cc-option,-fno-var-tracking) 769endif 770 771KBUILD_CFLAGS += $(DEBUG_CFLAGS) 772export DEBUG_CFLAGS 773 774ifdef CONFIG_FUNCTION_TRACER 775ifdef CONFIG_FTRACE_MCOUNT_RECORD 776 # gcc 5 supports generating the mcount tables directly 777 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 778 CC_FLAGS_FTRACE += -mrecord-mcount 779 export CC_USING_RECORD_MCOUNT := 1 780 endif 781 ifdef CONFIG_HAVE_NOP_MCOUNT 782 ifeq ($(call cc-option-yn, -mnop-mcount),y) 783 CC_FLAGS_FTRACE += -mnop-mcount 784 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 785 endif 786 endif 787endif 788ifdef CONFIG_HAVE_FENTRY 789 ifeq ($(call cc-option-yn, -mfentry),y) 790 CC_FLAGS_FTRACE += -mfentry 791 CC_FLAGS_USING += -DCC_USING_FENTRY 792 endif 793endif 794export CC_FLAGS_FTRACE 795KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 796KBUILD_AFLAGS += $(CC_FLAGS_USING) 797ifdef CONFIG_DYNAMIC_FTRACE 798 ifdef CONFIG_HAVE_C_RECORDMCOUNT 799 BUILD_C_RECORDMCOUNT := y 800 export BUILD_C_RECORDMCOUNT 801 endif 802endif 803endif 804 805# We trigger additional mismatches with less inlining 806ifdef CONFIG_DEBUG_SECTION_MISMATCH 807KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 808endif 809 810ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 811KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 812LDFLAGS_vmlinux += --gc-sections 813endif 814 815# arch Makefile may override CC so keep this after arch Makefile is included 816NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 817 818# warn about C99 declaration after statement 819KBUILD_CFLAGS += -Wdeclaration-after-statement 820 821# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 822KBUILD_CFLAGS += $(call cc-option,-Wvla) 823 824# disable pointer signed / unsigned warnings in gcc 4.0 825KBUILD_CFLAGS += -Wno-pointer-sign 826 827# disable stringop warnings in gcc 8+ 828KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 829 830# disable invalid "can't wrap" optimizations for signed / pointers 831KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 832 833# clang sets -fmerge-all-constants by default as optimization, but this 834# is non-conforming behavior for C and in fact breaks the kernel, so we 835# need to disable it here generally. 836KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 837 838# for gcc -fno-merge-all-constants disables everything, but it is fine 839# to have actual conforming behavior enabled. 840KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 841 842# Make sure -fstack-check isn't enabled (like gentoo apparently did) 843KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 844 845# conserve stack if available 846KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 847 848# Prohibit date/time macros, which would make the build non-deterministic 849KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 850 851# enforce correct pointer usage 852KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 853 854# Require designated initializers for all marked structures 855KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 856 857# change __FILE__ to the relative path from the srctree 858KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 859 860# use the deterministic mode of AR if available 861KBUILD_ARFLAGS := $(call ar-option,D) 862 863include scripts/Makefile.kasan 864include scripts/Makefile.extrawarn 865include scripts/Makefile.ubsan 866 867# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 868# last assignments 869KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 870KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 871KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 872 873# Use --build-id when available. 874LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 875KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 876LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 877 878ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 879LDFLAGS_vmlinux += $(call ld-option, -X,) 880endif 881 882# insure the checker run with the right endianness 883CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 884 885# the checker needs the correct machine size 886CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 887 888# Default kernel image to build when no specific target is given. 889# KBUILD_IMAGE may be overruled on the command line or 890# set in the environment 891# Also any assignments in arch/$(ARCH)/Makefile take precedence over 892# this default value 893export KBUILD_IMAGE ?= vmlinux 894 895# 896# INSTALL_PATH specifies where to place the updated kernel and system map 897# images. Default is /boot, but you can set it to other values 898export INSTALL_PATH ?= /boot 899 900# 901# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 902# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 903# an argument if needed. Otherwise it defaults to the kernel install path 904# 905export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 906 907# 908# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 909# relocations required by build roots. This is not defined in the 910# makefile but the argument can be passed to make if needed. 911# 912 913MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 914export MODLIB 915 916# 917# INSTALL_MOD_STRIP, if defined, will cause modules to be 918# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 919# the default option --strip-debug will be used. Otherwise, 920# INSTALL_MOD_STRIP value will be used as the options to the strip command. 921 922ifdef INSTALL_MOD_STRIP 923ifeq ($(INSTALL_MOD_STRIP),1) 924mod_strip_cmd = $(STRIP) --strip-debug 925else 926mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 927endif # INSTALL_MOD_STRIP=1 928else 929mod_strip_cmd = true 930endif # INSTALL_MOD_STRIP 931export mod_strip_cmd 932 933# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 934# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 935# or CONFIG_MODULE_COMPRESS_XZ. 936 937mod_compress_cmd = true 938ifdef CONFIG_MODULE_COMPRESS 939 ifdef CONFIG_MODULE_COMPRESS_GZIP 940 mod_compress_cmd = gzip -n -f 941 endif # CONFIG_MODULE_COMPRESS_GZIP 942 ifdef CONFIG_MODULE_COMPRESS_XZ 943 mod_compress_cmd = xz -f 944 endif # CONFIG_MODULE_COMPRESS_XZ 945endif # CONFIG_MODULE_COMPRESS 946export mod_compress_cmd 947 948ifdef CONFIG_MODULE_SIG_ALL 949$(eval $(call config_filename,MODULE_SIG_KEY)) 950 951mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 952else 953mod_sign_cmd = true 954endif 955export mod_sign_cmd 956 957HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 958 959ifdef CONFIG_STACK_VALIDATION 960 has_libelf := $(call try-run,\ 961 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 962 ifeq ($(has_libelf),1) 963 objtool_target := tools/objtool FORCE 964 else 965 SKIP_STACK_VALIDATION := 1 966 export SKIP_STACK_VALIDATION 967 endif 968endif 969 970PHONY += prepare0 971 972ifeq ($(KBUILD_EXTMOD),) 973core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 974 975vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 976 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 977 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 978 979vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 980 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 981 982init-y := $(patsubst %/, %/built-in.a, $(init-y)) 983core-y := $(patsubst %/, %/built-in.a, $(core-y)) 984drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 985net-y := $(patsubst %/, %/built-in.a, $(net-y)) 986libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 987libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 988virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 989 990# Externally visible symbols (used by link-vmlinux.sh) 991export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 992 $(drivers-y) $(net-y) $(virt-y) 993export KBUILD_VMLINUX_LIBS := $(libs-y1) 994export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 995export LDFLAGS_vmlinux 996# used by scripts/package/Makefile 997export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 998 999vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1000 1001# Recurse until adjust_autoksyms.sh is satisfied 1002PHONY += autoksyms_recursive 1003autoksyms_recursive: $(vmlinux-deps) 1004ifdef CONFIG_TRIM_UNUSED_KSYMS 1005 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1006 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1007endif 1008 1009# For the kernel to actually contain only the needed exported symbols, 1010# we have to build modules as well to determine what those symbols are. 1011# (this can be evaluated only once include/config/auto.conf has been included) 1012ifdef CONFIG_TRIM_UNUSED_KSYMS 1013 KBUILD_MODULES := 1 1014endif 1015 1016autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1017 1018$(autoksyms_h): 1019 $(Q)mkdir -p $(dir $@) 1020 $(Q)touch $@ 1021 1022ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1023 1024# Final link of vmlinux with optional arch pass after final link 1025cmd_link-vmlinux = \ 1026 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1027 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1028 1029vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1030 +$(call if_changed,link-vmlinux) 1031 1032targets := vmlinux 1033 1034# Build samples along the rest of the kernel. This needs headers_install. 1035ifdef CONFIG_SAMPLES 1036vmlinux-dirs += samples 1037samples: headers_install 1038endif 1039 1040# The actual objects are generated when descending, 1041# make sure no implicit rule kicks in 1042$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1043 1044# Handle descending into subdirectories listed in $(vmlinux-dirs) 1045# Preset locale variables to speed up the build process. Limit locale 1046# tweaks to this spot to avoid wrong language settings when running 1047# make menuconfig etc. 1048# Error messages still appears in the original language 1049 1050PHONY += $(vmlinux-dirs) 1051$(vmlinux-dirs): prepare 1052 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1053 1054filechk_kernel.release = \ 1055 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1056 1057# Store (new) KERNELRELEASE string in include/config/kernel.release 1058include/config/kernel.release: $(srctree)/Makefile FORCE 1059 $(call filechk,kernel.release) 1060 1061# Additional helpers built in scripts/ 1062# Carefully list dependencies so we do not try to build scripts twice 1063# in parallel 1064PHONY += scripts 1065scripts: scripts_basic scripts_dtc 1066 $(Q)$(MAKE) $(build)=$(@) 1067 1068# Things we need to do before we recursively start building the kernel 1069# or the modules are listed in "prepare". 1070# A multi level approach is used. prepareN is processed before prepareN-1. 1071# archprepare is used in arch Makefiles and when processed asm symlink, 1072# version.h and scripts_basic is processed / created. 1073 1074PHONY += prepare archprepare prepare1 prepare3 1075 1076# prepare3 is used to check if we are building in a separate output directory, 1077# and if so do: 1078# 1) Check that make has not been executed in the kernel src $(srctree) 1079prepare3: include/config/kernel.release 1080ifneq ($(KBUILD_SRC),) 1081 @$(kecho) ' Using $(srctree) as source for kernel' 1082 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1083 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1084 echo >&2 " in the '$(srctree)' directory.";\ 1085 /bin/false; \ 1086 fi; 1087endif 1088 1089prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \ 1090 include/generated/utsrelease.h 1091 $(cmd_crmodverdir) 1092 1093archprepare: archheaders archscripts prepare1 scripts 1094 1095prepare0: archprepare 1096 $(Q)$(MAKE) $(build)=scripts/mod 1097 $(Q)$(MAKE) $(build)=. 1098 1099# All the preparing.. 1100prepare: prepare0 prepare-objtool 1101 1102# Support for using generic headers in asm-generic 1103asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1104 1105PHONY += asm-generic uapi-asm-generic 1106asm-generic: uapi-asm-generic 1107 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1108 generic=include/asm-generic 1109uapi-asm-generic: 1110 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1111 generic=include/uapi/asm-generic 1112 1113PHONY += prepare-objtool 1114prepare-objtool: $(objtool_target) 1115ifeq ($(SKIP_STACK_VALIDATION),1) 1116ifdef CONFIG_UNWINDER_ORC 1117 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1118 @false 1119else 1120 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1121endif 1122endif 1123 1124# Generate some files 1125# --------------------------------------------------------------------------- 1126 1127# KERNELRELEASE can change from a few different places, meaning version.h 1128# needs to be updated, so this check is forced on all builds 1129 1130uts_len := 64 1131define filechk_utsrelease.h 1132 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1133 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1134 exit 1; \ 1135 fi; \ 1136 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1137endef 1138 1139define filechk_version.h 1140 echo \#define LINUX_VERSION_CODE $(shell \ 1141 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1142 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1143endef 1144 1145$(version_h): FORCE 1146 $(call filechk,version.h) 1147 $(Q)rm -f $(old_version_h) 1148 1149include/generated/utsrelease.h: include/config/kernel.release FORCE 1150 $(call filechk,utsrelease.h) 1151 1152PHONY += headerdep 1153headerdep: 1154 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1155 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1156 1157# --------------------------------------------------------------------------- 1158# Kernel headers 1159 1160#Default location for installed headers 1161export INSTALL_HDR_PATH = $(objtree)/usr 1162 1163# If we do an all arch process set dst to include/arch-$(SRCARCH) 1164hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1165 1166PHONY += archheaders archscripts 1167 1168PHONY += __headers 1169__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1170 $(Q)$(MAKE) $(build)=scripts build_unifdef 1171 1172PHONY += headers_install_all 1173headers_install_all: 1174 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1175 1176PHONY += headers_install 1177headers_install: __headers 1178 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1179 $(error Headers not exportable for the $(SRCARCH) architecture)) 1180 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1181 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1182 1183PHONY += headers_check_all 1184headers_check_all: headers_install_all 1185 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1186 1187PHONY += headers_check 1188headers_check: headers_install 1189 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1190 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1191 1192ifdef CONFIG_HEADERS_CHECK 1193all: headers_check 1194endif 1195 1196# --------------------------------------------------------------------------- 1197# Kernel selftest 1198 1199PHONY += kselftest 1200kselftest: 1201 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1202 1203PHONY += kselftest-clean 1204kselftest-clean: 1205 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1206 1207PHONY += kselftest-merge 1208kselftest-merge: 1209 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1210 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1211 -m $(objtree)/.config \ 1212 $(srctree)/tools/testing/selftests/*/config 1213 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1214 1215# --------------------------------------------------------------------------- 1216# Devicetree files 1217 1218ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1219dtstree := arch/$(SRCARCH)/boot/dts 1220endif 1221 1222ifneq ($(dtstree),) 1223 1224%.dtb: prepare3 scripts_dtc 1225 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1226 1227PHONY += dtbs dtbs_install dt_binding_check 1228dtbs dtbs_check: prepare3 scripts_dtc 1229 $(Q)$(MAKE) $(build)=$(dtstree) 1230 1231dtbs_check: export CHECK_DTBS=1 1232dtbs_check: dt_binding_check 1233 1234dtbs_install: 1235 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1236 1237ifdef CONFIG_OF_EARLY_FLATTREE 1238all: dtbs 1239endif 1240 1241endif 1242 1243PHONY += scripts_dtc 1244scripts_dtc: scripts_basic 1245 $(Q)$(MAKE) $(build)=scripts/dtc 1246 1247dt_binding_check: scripts_dtc 1248 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1249 1250# --------------------------------------------------------------------------- 1251# Modules 1252 1253ifdef CONFIG_MODULES 1254 1255# By default, build modules as well 1256 1257all: modules 1258 1259# Build modules 1260# 1261# A module can be listed more than once in obj-m resulting in 1262# duplicate lines in modules.order files. Those are removed 1263# using awk while concatenating to the final file. 1264 1265PHONY += modules 1266modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1267 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1268 @$(kecho) ' Building modules, stage 2.'; 1269 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1270 1271modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1272 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1273 1274%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1275 $(Q)$(MAKE) $(modbuiltin)=$* 1276 1277 1278# Target to prepare building external modules 1279PHONY += modules_prepare 1280modules_prepare: prepare 1281 1282# Target to install modules 1283PHONY += modules_install 1284modules_install: _modinst_ _modinst_post 1285 1286PHONY += _modinst_ 1287_modinst_: 1288 @rm -rf $(MODLIB)/kernel 1289 @rm -f $(MODLIB)/source 1290 @mkdir -p $(MODLIB)/kernel 1291 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1292 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1293 rm -f $(MODLIB)/build ; \ 1294 ln -s $(CURDIR) $(MODLIB)/build ; \ 1295 fi 1296 @cp -f $(objtree)/modules.order $(MODLIB)/ 1297 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1298 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1299 1300# This depmod is only for convenience to give the initial 1301# boot a modules.dep even before / is mounted read-write. However the 1302# boot script depmod is the master version. 1303PHONY += _modinst_post 1304_modinst_post: _modinst_ 1305 $(call cmd,depmod) 1306 1307ifeq ($(CONFIG_MODULE_SIG), y) 1308PHONY += modules_sign 1309modules_sign: 1310 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1311endif 1312 1313else # CONFIG_MODULES 1314 1315# Modules not configured 1316# --------------------------------------------------------------------------- 1317 1318PHONY += modules modules_install 1319modules modules_install: 1320 @echo >&2 1321 @echo >&2 "The present kernel configuration has modules disabled." 1322 @echo >&2 "Type 'make config' and enable loadable module support." 1323 @echo >&2 "Then build a kernel with module support enabled." 1324 @echo >&2 1325 @exit 1 1326 1327endif # CONFIG_MODULES 1328 1329### 1330# Cleaning is done on three levels. 1331# make clean Delete most generated files 1332# Leave enough to build external modules 1333# make mrproper Delete the current configuration, and all generated files 1334# make distclean Remove editor backup files, patch leftover files and the like 1335 1336# Directories & files removed with 'make clean' 1337CLEAN_DIRS += $(MODVERDIR) include/ksym 1338 1339# Directories & files removed with 'make mrproper' 1340MRPROPER_DIRS += include/config usr/include include/generated \ 1341 arch/*/include/generated .tmp_objdiff 1342MRPROPER_FILES += .config .config.old .version \ 1343 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1344 signing_key.pem signing_key.priv signing_key.x509 \ 1345 x509.genkey extra_certificates signing_key.x509.keyid \ 1346 signing_key.x509.signer vmlinux-gdb.py 1347 1348# clean - Delete most, but leave enough to build external modules 1349# 1350clean: rm-dirs := $(CLEAN_DIRS) 1351clean: rm-files := $(CLEAN_FILES) 1352clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1353 1354PHONY += $(clean-dirs) clean archclean vmlinuxclean 1355$(clean-dirs): 1356 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1357 1358vmlinuxclean: 1359 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1360 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1361 1362clean: archclean vmlinuxclean 1363 1364# mrproper - Delete all generated files, including .config 1365# 1366mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1367mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1368mrproper-dirs := $(addprefix _mrproper_,scripts) 1369 1370PHONY += $(mrproper-dirs) mrproper 1371$(mrproper-dirs): 1372 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1373 1374mrproper: clean $(mrproper-dirs) 1375 $(call cmd,rmdirs) 1376 $(call cmd,rmfiles) 1377 1378# distclean 1379# 1380PHONY += distclean 1381 1382distclean: mrproper 1383 @find $(srctree) $(RCS_FIND_IGNORE) \ 1384 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1385 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1386 -o -name 'core' \) \ 1387 -type f -print | xargs rm -f 1388 1389 1390# Packaging of the kernel to various formats 1391# --------------------------------------------------------------------------- 1392package-dir := scripts/package 1393 1394%src-pkg: FORCE 1395 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1396%pkg: include/config/kernel.release FORCE 1397 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1398 1399 1400# Brief documentation of the typical targets used 1401# --------------------------------------------------------------------------- 1402 1403boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1404boards := $(sort $(notdir $(boards))) 1405board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1406board-dirs := $(sort $(notdir $(board-dirs:/=))) 1407 1408PHONY += help 1409help: 1410 @echo 'Cleaning targets:' 1411 @echo ' clean - Remove most generated files but keep the config and' 1412 @echo ' enough build support to build external modules' 1413 @echo ' mrproper - Remove all generated files + config + various backup files' 1414 @echo ' distclean - mrproper + remove editor backup and patch files' 1415 @echo '' 1416 @echo 'Configuration targets:' 1417 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1418 @echo '' 1419 @echo 'Other generic targets:' 1420 @echo ' all - Build all targets marked with [*]' 1421 @echo '* vmlinux - Build the bare kernel' 1422 @echo '* modules - Build all modules' 1423 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1424 @echo ' dir/ - Build all files in dir and below' 1425 @echo ' dir/file.[ois] - Build specified target only' 1426 @echo ' dir/file.ll - Build the LLVM assembly file' 1427 @echo ' (requires compiler support for LLVM assembly generation)' 1428 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1429 @echo ' (requires a recent binutils and recent build (System.map))' 1430 @echo ' dir/file.ko - Build module including final link' 1431 @echo ' modules_prepare - Set up for building external modules' 1432 @echo ' tags/TAGS - Generate tags file for editors' 1433 @echo ' cscope - Generate cscope index' 1434 @echo ' gtags - Generate GNU GLOBAL index' 1435 @echo ' kernelrelease - Output the release version string (use with make -s)' 1436 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1437 @echo ' image_name - Output the image name (use with make -s)' 1438 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1439 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1440 echo '' 1441 @echo 'Static analysers:' 1442 @echo ' checkstack - Generate a list of stack hogs' 1443 @echo ' namespacecheck - Name space analysis on compiled kernel' 1444 @echo ' versioncheck - Sanity check on version.h usage' 1445 @echo ' includecheck - Check for duplicate included header files' 1446 @echo ' export_report - List the usages of all exported symbols' 1447 @echo ' headers_check - Sanity check on exported headers' 1448 @echo ' headerdep - Detect inclusion cycles in headers' 1449 @echo ' coccicheck - Check with Coccinelle' 1450 @echo '' 1451 @echo 'Kernel selftest:' 1452 @echo ' kselftest - Build and run kernel selftest (run as root)' 1453 @echo ' Build, install, and boot kernel before' 1454 @echo ' running kselftest on it' 1455 @echo ' kselftest-clean - Remove all generated kselftest files' 1456 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1457 @echo ' .config.' 1458 @echo '' 1459 @$(if $(dtstree), \ 1460 echo 'Devicetree:'; \ 1461 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1462 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1463 echo '') 1464 1465 @echo 'Userspace tools targets:' 1466 @echo ' use "make tools/help"' 1467 @echo ' or "cd tools; make help"' 1468 @echo '' 1469 @echo 'Kernel packaging:' 1470 @$(MAKE) $(build)=$(package-dir) help 1471 @echo '' 1472 @echo 'Documentation targets:' 1473 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1474 @echo '' 1475 @echo 'Architecture specific targets ($(SRCARCH)):' 1476 @$(if $(archhelp),$(archhelp),\ 1477 echo ' No architecture specific help defined for $(SRCARCH)') 1478 @echo '' 1479 @$(if $(boards), \ 1480 $(foreach b, $(boards), \ 1481 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1482 echo '') 1483 @$(if $(board-dirs), \ 1484 $(foreach b, $(board-dirs), \ 1485 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1486 printf " %-16s - Show all of the above\\n" help-boards; \ 1487 echo '') 1488 1489 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1490 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1491 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1492 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1493 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1494 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1495 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1496 @echo ' 1: warnings which may be relevant and do not occur too often' 1497 @echo ' 2: warnings which occur quite often but may still be relevant' 1498 @echo ' 3: more obscure warnings, can most likely be ignored' 1499 @echo ' Multiple levels can be combined with W=12 or W=123' 1500 @echo '' 1501 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1502 @echo 'For further info see the ./README file' 1503 1504 1505help-board-dirs := $(addprefix help-,$(board-dirs)) 1506 1507help-boards: $(help-board-dirs) 1508 1509boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1510 1511$(help-board-dirs): help-%: 1512 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1513 @$(if $(boards-per-dir), \ 1514 $(foreach b, $(boards-per-dir), \ 1515 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1516 echo '') 1517 1518 1519# Documentation targets 1520# --------------------------------------------------------------------------- 1521DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1522 linkcheckdocs dochelp refcheckdocs 1523PHONY += $(DOC_TARGETS) 1524$(DOC_TARGETS): scripts_basic FORCE 1525 $(Q)$(MAKE) $(build)=Documentation $@ 1526 1527# Misc 1528# --------------------------------------------------------------------------- 1529 1530PHONY += scripts_gdb 1531scripts_gdb: prepare 1532 $(Q)$(MAKE) $(build)=scripts/gdb 1533 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1534 1535ifdef CONFIG_GDB_SCRIPTS 1536all: scripts_gdb 1537endif 1538 1539else # KBUILD_EXTMOD 1540 1541### 1542# External module support. 1543# When building external modules the kernel used as basis is considered 1544# read-only, and no consistency checks are made and the make 1545# system is not used on the basis kernel. If updates are required 1546# in the basis kernel ordinary make commands (without M=...) must 1547# be used. 1548# 1549# The following are the only valid targets when building external 1550# modules. 1551# make M=dir clean Delete all automatically generated files 1552# make M=dir modules Make all modules in specified dir 1553# make M=dir Same as 'make M=dir modules' 1554# make M=dir modules_install 1555# Install the modules built in the module directory 1556# Assumes install directory is already created 1557 1558# We are always building modules 1559KBUILD_MODULES := 1 1560 1561PHONY += $(objtree)/Module.symvers 1562$(objtree)/Module.symvers: 1563 @test -e $(objtree)/Module.symvers || ( \ 1564 echo; \ 1565 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1566 echo " is missing; modules will have no dependencies and modversions."; \ 1567 echo ) 1568 1569module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1570PHONY += $(module-dirs) modules 1571$(module-dirs): prepare $(objtree)/Module.symvers 1572 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1573 1574modules: $(module-dirs) 1575 @$(kecho) ' Building modules, stage 2.'; 1576 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1577 1578PHONY += modules_install 1579modules_install: _emodinst_ _emodinst_post 1580 1581install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1582PHONY += _emodinst_ 1583_emodinst_: 1584 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1585 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1586 1587PHONY += _emodinst_post 1588_emodinst_post: _emodinst_ 1589 $(call cmd,depmod) 1590 1591clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1592 1593PHONY += $(clean-dirs) clean 1594$(clean-dirs): 1595 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1596 1597clean: rm-dirs := $(MODVERDIR) 1598clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1599 1600PHONY += help 1601help: 1602 @echo ' Building external modules.' 1603 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1604 @echo '' 1605 @echo ' modules - default target, build the module(s)' 1606 @echo ' modules_install - install the module' 1607 @echo ' clean - remove generated files in module directory only' 1608 @echo '' 1609 1610PHONY += prepare 1611prepare: 1612 $(cmd_crmodverdir) 1613endif # KBUILD_EXTMOD 1614 1615clean: $(clean-dirs) 1616 $(call cmd,rmdirs) 1617 $(call cmd,rmfiles) 1618 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1619 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1620 -o -name '*.ko.*' \ 1621 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1622 -o -name '*.dwo' -o -name '*.lst' \ 1623 -o -name '*.su' \ 1624 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1625 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1626 -o -name '*.asn1.[ch]' \ 1627 -o -name '*.symtypes' -o -name 'modules.order' \ 1628 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1629 -o -name '*.c.[012]*.*' \ 1630 -o -name '*.ll' \ 1631 -o -name '*.gcno' \) -type f -print | xargs rm -f 1632 1633# Generate tags for editors 1634# --------------------------------------------------------------------------- 1635quiet_cmd_tags = GEN $@ 1636 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1637 1638tags TAGS cscope gtags: FORCE 1639 $(call cmd,tags) 1640 1641# Scripts to check various things for consistency 1642# --------------------------------------------------------------------------- 1643 1644PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1645 1646includecheck: 1647 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1648 -name '*.[hcS]' -type f -print | sort \ 1649 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1650 1651versioncheck: 1652 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1653 -name '*.[hcS]' -type f -print | sort \ 1654 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1655 1656coccicheck: 1657 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1658 1659namespacecheck: 1660 $(PERL) $(srctree)/scripts/namespace.pl 1661 1662export_report: 1663 $(PERL) $(srctree)/scripts/export_report.pl 1664 1665PHONY += checkstack kernelrelease kernelversion image_name 1666 1667# UML needs a little special treatment here. It wants to use the host 1668# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1669# else wants $(ARCH), including people doing cross-builds, which means 1670# that $(SUBARCH) doesn't work here. 1671ifeq ($(ARCH), um) 1672CHECKSTACK_ARCH := $(SUBARCH) 1673else 1674CHECKSTACK_ARCH := $(ARCH) 1675endif 1676checkstack: 1677 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1678 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1679 1680kernelrelease: 1681 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1682 1683kernelversion: 1684 @echo $(KERNELVERSION) 1685 1686image_name: 1687 @echo $(KBUILD_IMAGE) 1688 1689# Clear a bunch of variables before executing the submake 1690 1691ifeq ($(quiet),silent_) 1692tools_silent=s 1693endif 1694 1695tools/: FORCE 1696 $(Q)mkdir -p $(objtree)/tools 1697 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1698 1699tools/%: FORCE 1700 $(Q)mkdir -p $(objtree)/tools 1701 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1702 1703# Single targets 1704# --------------------------------------------------------------------------- 1705# Single targets are compatible with: 1706# - build with mixed source and output 1707# - build with separate output dir 'make O=...' 1708# - external modules 1709# 1710# target-dir => where to store outputfile 1711# build-dir => directory in kernel source tree to use 1712 1713build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ 1714build-dir = $(patsubst %/,%,$(dir $(build-target))) 1715 1716%.i: prepare FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1718%.ll: prepare FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1720%.lst: prepare FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1722%.o: prepare FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1724%.s: prepare FORCE 1725 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1726%.symtypes: prepare FORCE 1727 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1728%.ko: %.o 1729 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1730 1731# Modules 1732PHONY += / 1733/: ./ 1734 1735# Make sure the latest headers are built for Documentation 1736Documentation/ samples/: headers_install 1737%/: prepare FORCE 1738 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) 1739 1740# FIXME Should go into a make.lib or something 1741# =========================================================================== 1742 1743quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1744 cmd_rmdirs = rm -rf $(rm-dirs) 1745 1746quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1747 cmd_rmfiles = rm -f $(rm-files) 1748 1749# Run depmod only if we have System.map and depmod is executable 1750quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1751 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1752 $(KERNELRELEASE) 1753 1754# Create temporary dir for module support files 1755# clean it up only when building all modules 1756cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1757 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1758 1759# read saved command lines for existing targets 1760existing-targets := $(wildcard $(sort $(targets))) 1761 1762-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1763 1764endif # ifeq ($(config-targets),1) 1765endif # ifeq ($(mixed-targets),1) 1766endif # need-sub-make 1767 1768PHONY += FORCE 1769FORCE: 1770 1771# Declare the contents of the PHONY variable as phony. We keep that 1772# information in a variable so we can use it in if_changed and friends. 1773.PHONY: $(PHONY) 1774