1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 15 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Trick or Treat 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$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# --included-dir is added for backward compatibility, but you should not rely on 195# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197endif 198 199ifneq ($(filter 3.%,$(MAKE_VERSION)),) 200# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 201# We need to invoke sub-make to avoid implicit rules in the top Makefile. 202need-sub-make := 1 203# Cancel implicit rules for this Makefile. 204$(this-makefile): ; 205endif 206 207export abs_srctree abs_objtree 208export sub_make_done := 1 209 210ifeq ($(need-sub-make),1) 211 212PHONY += $(MAKECMDGOALS) __sub-make 213 214$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 215 @: 216 217# Invoke a second make in the output directory, passing relevant variables 218__sub-make: 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 220 221endif # need-sub-make 222endif # sub_make_done 223 224# We process the rest of the Makefile if this is the final invocation of make 225ifeq ($(need-sub-make),) 226 227# Do not print "Entering directory ...", 228# but we want to display it when entering to the output directory 229# so that IDEs/editors are able to understand relative filenames. 230MAKEFLAGS += --no-print-directory 231 232ifeq ($(abs_srctree),$(abs_objtree)) 233 # building in the source tree 234 srctree := . 235 building_out_of_srctree := 236else 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 238 # building in a subdirectory of the source tree 239 srctree := .. 240 else 241 srctree := $(abs_srctree) 242 endif 243 building_out_of_srctree := 1 244endif 245 246ifneq ($(KBUILD_ABS_SRCTREE),) 247srctree := $(abs_srctree) 248endif 249 250objtree := . 251VPATH := $(srctree) 252 253export building_out_of_srctree srctree objtree VPATH 254 255# To make sure we do not include .config for any of the *config targets 256# catch them early, and hand them over to scripts/kconfig/Makefile 257# It is allowed to specify more targets when calling make, including 258# mixing *config targets and build targets. 259# For example 'make oldconfig all'. 260# Detect when mixed targets is specified, and make a second invocation 261# of make so .config is not included in this case either (for *config). 262 263version_h := include/generated/uapi/linux/version.h 264 265clean-targets := %clean mrproper cleandocs 266no-dot-config-targets := $(clean-targets) \ 267 cscope gtags TAGS tags help% %docs check% coccicheck \ 268 $(version_h) headers headers_% archheaders archscripts \ 269 %asm-generic kernelversion %src-pkg dt_binding_check \ 270 outputmakefile 271# Installation targets should not require compiler. Unfortunately, vdso_install 272# is an exception where build artifacts may be updated. This must be fixed. 273no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 274 headers_install modules_install kernelrelease image_name 275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279config-build := 280mixed-build := 281need-config := 1 282need-compiler := 1 283may-sync-config := 1 284single-build := 285 286ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 need-config := 289 endif 290endif 291 292ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 294 need-compiler := 295 endif 296endif 297 298ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 may-sync-config := 301 endif 302endif 303 304ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306endif 307 308ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315endif 316 317# We cannot build single targets and the others at the same time 318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# For "make -j clean all", "make -j mrproper defconfig all", etc. 326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# install and modules_install need also be processed one by one 333ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339ifdef mixed-build 340# =========================================================================== 341# We're called with mixed targets (*config and build targets). 342# Handle them one by one. 343 344PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346$(MAKECMDGOALS): __build_one_by_one 347 @: 348 349__build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355else # !mixed-build 356 357include $(srctree)/scripts/Kbuild.include 358 359# Read KERNELRELEASE from include/config/kernel.release (if it exists) 360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364include $(srctree)/scripts/subarch.include 365 366# Cross compiling and selecting different set of gcc/bin-utils 367# --------------------------------------------------------------------------- 368# 369# When performing cross compilation for other architectures ARCH shall be set 370# to the target architecture. (See arch/* for the possibilities). 371# ARCH can be set during invocation of make: 372# make ARCH=ia64 373# Another way is to have ARCH set in the environment. 374# The default ARCH is the host where make is executed. 375 376# CROSS_COMPILE specify the prefix used for all executables used 377# during compilation. Only gcc and related bin-utils executables 378# are prefixed with $(CROSS_COMPILE). 379# CROSS_COMPILE can be set on the command line 380# make CROSS_COMPILE=ia64-linux- 381# Alternatively CROSS_COMPILE can be set in the environment. 382# Default value for CROSS_COMPILE is not to prefix executables 383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384ARCH ?= $(SUBARCH) 385 386# Architecture as present in compile.h 387UTS_MACHINE := $(ARCH) 388SRCARCH := $(ARCH) 389 390# Additional ARCH settings for x86 391ifeq ($(ARCH),i386) 392 SRCARCH := x86 393endif 394ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396endif 397 398# Additional ARCH settings for sparc 399ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401endif 402ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404endif 405 406# Additional ARCH settings for parisc 407ifeq ($(ARCH),parisc64) 408 SRCARCH := parisc 409endif 410 411export cross_compiling := 412ifneq ($(SRCARCH),$(SUBARCH)) 413cross_compiling := 1 414endif 415 416KCONFIG_CONFIG ?= .config 417export KCONFIG_CONFIG 418 419# SHELL used by kbuild 420CONFIG_SHELL := sh 421 422HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 423HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 424HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 425 426ifneq ($(LLVM),) 427HOSTCC = clang 428HOSTCXX = clang++ 429else 430HOSTCC = gcc 431HOSTCXX = g++ 432endif 433 434export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 435 -O2 -fomit-frame-pointer -std=gnu89 436export KBUILD_USERLDFLAGS := 437 438KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 439KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 440KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 441KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 442 443# Make variables (CC, etc...) 444CPP = $(CC) -E 445ifneq ($(LLVM),) 446CC = clang 447LD = ld.lld 448AR = llvm-ar 449NM = llvm-nm 450OBJCOPY = llvm-objcopy 451OBJDUMP = llvm-objdump 452READELF = llvm-readelf 453STRIP = llvm-strip 454else 455CC = $(CROSS_COMPILE)gcc 456LD = $(CROSS_COMPILE)ld 457AR = $(CROSS_COMPILE)ar 458NM = $(CROSS_COMPILE)nm 459OBJCOPY = $(CROSS_COMPILE)objcopy 460OBJDUMP = $(CROSS_COMPILE)objdump 461READELF = $(CROSS_COMPILE)readelf 462STRIP = $(CROSS_COMPILE)strip 463endif 464PAHOLE = pahole 465RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 466LEX = flex 467YACC = bison 468AWK = awk 469INSTALLKERNEL := installkernel 470DEPMOD = depmod 471PERL = perl 472PYTHON3 = python3 473CHECK = sparse 474BASH = bash 475KGZIP = gzip 476KBZIP2 = bzip2 477KLZOP = lzop 478LZMA = lzma 479LZ4 = lz4c 480XZ = xz 481ZSTD = zstd 482 483CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 484 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 485NOSTDINC_FLAGS := 486CFLAGS_MODULE = 487AFLAGS_MODULE = 488LDFLAGS_MODULE = 489CFLAGS_KERNEL = 490AFLAGS_KERNEL = 491LDFLAGS_vmlinux = 492 493# Use USERINCLUDE when you must reference the UAPI directories only. 494USERINCLUDE := \ 495 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 496 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 497 -I$(srctree)/include/uapi \ 498 -I$(objtree)/include/generated/uapi \ 499 -include $(srctree)/include/linux/compiler-version.h \ 500 -include $(srctree)/include/linux/kconfig.h 501 502# Use LINUXINCLUDE when you must reference the include/ directory. 503# Needed to be compatible with the O= option 504LINUXINCLUDE := \ 505 -I$(srctree)/arch/$(SRCARCH)/include \ 506 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 507 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 508 -I$(objtree)/include \ 509 $(USERINCLUDE) 510 511KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 512KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 513 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 514 -Werror=implicit-function-declaration -Werror=implicit-int \ 515 -Werror=return-type -Wno-format-security \ 516 -std=gnu89 517KBUILD_CPPFLAGS := -D__KERNEL__ 518KBUILD_AFLAGS_KERNEL := 519KBUILD_CFLAGS_KERNEL := 520KBUILD_AFLAGS_MODULE := -DMODULE 521KBUILD_CFLAGS_MODULE := -DMODULE 522KBUILD_LDFLAGS_MODULE := 523KBUILD_LDFLAGS := 524CLANG_FLAGS := 525 526export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 527export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 528export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 529export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 530export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 531 532export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 533export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 534export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 535export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 536export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 537 538# Files to ignore in find ... statements 539 540export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 541 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 542 -prune -o 543export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 544 --exclude CVS --exclude .pc --exclude .hg --exclude .git 545 546# =========================================================================== 547# Rules shared between *config targets and build targets 548 549# Basic helpers built in scripts/basic/ 550PHONY += scripts_basic 551scripts_basic: 552 $(Q)$(MAKE) $(build)=scripts/basic 553 554PHONY += outputmakefile 555ifdef building_out_of_srctree 556# Before starting out-of-tree build, make sure the source tree is clean. 557# outputmakefile generates a Makefile in the output directory, if using a 558# separate output directory. This allows convenient use of make in the 559# output directory. 560# At the same time when output Makefile generated, generate .gitignore to 561# ignore whole output directory 562 563quiet_cmd_makefile = GEN Makefile 564 cmd_makefile = { \ 565 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 566 echo "include $(srctree)/Makefile"; \ 567 } > Makefile 568 569outputmakefile: 570 $(Q)if [ -f $(srctree)/.config -o \ 571 -d $(srctree)/include/config -o \ 572 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 573 echo >&2 "***"; \ 574 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 575 echo >&2 "*** in $(abs_srctree)";\ 576 echo >&2 "***"; \ 577 false; \ 578 fi 579 $(Q)ln -fsn $(srctree) source 580 $(call cmd,makefile) 581 $(Q)test -e .gitignore || \ 582 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 583endif 584 585# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 586# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 587# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 588# and from include/config/auto.conf.cmd to detect the compiler upgrade. 589CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 590 591ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 592include $(srctree)/scripts/Makefile.clang 593endif 594 595# Include this also for config targets because some architectures need 596# cc-cross-prefix to determine CROSS_COMPILE. 597ifdef need-compiler 598include $(srctree)/scripts/Makefile.compiler 599endif 600 601ifdef config-build 602# =========================================================================== 603# *config targets only - make sure prerequisites are updated, and descend 604# in scripts/kconfig to make the *config target 605 606# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 607# KBUILD_DEFCONFIG may point out an alternative default configuration 608# used for 'make defconfig' 609include $(srctree)/arch/$(SRCARCH)/Makefile 610export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 611 612config: outputmakefile scripts_basic FORCE 613 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 614 615%config: outputmakefile scripts_basic FORCE 616 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 617 618else #!config-build 619# =========================================================================== 620# Build targets only - this includes vmlinux, arch specific targets, clean 621# targets and others. In general all targets except *config targets. 622 623# If building an external module we do not care about the all: rule 624# but instead __all depend on modules 625PHONY += all 626ifeq ($(KBUILD_EXTMOD),) 627__all: all 628else 629__all: modules 630endif 631 632# Decide whether to build built-in, modular, or both. 633# Normally, just do built-in. 634 635KBUILD_MODULES := 636KBUILD_BUILTIN := 1 637 638# If we have only "make modules", don't compile built-in objects. 639ifeq ($(MAKECMDGOALS),modules) 640 KBUILD_BUILTIN := 641endif 642 643# If we have "make <whatever> modules", compile modules 644# in addition to whatever we do anyway. 645# Just "make" or "make all" shall build modules as well 646 647ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 648 KBUILD_MODULES := 1 649endif 650 651ifeq ($(MAKECMDGOALS),) 652 KBUILD_MODULES := 1 653endif 654 655export KBUILD_MODULES KBUILD_BUILTIN 656 657ifdef need-config 658include include/config/auto.conf 659endif 660 661ifeq ($(KBUILD_EXTMOD),) 662# Objects we will link into vmlinux / subdirs we need to visit 663core-y := init/ usr/ arch/$(SRCARCH)/ 664drivers-y := drivers/ sound/ 665drivers-$(CONFIG_SAMPLES) += samples/ 666drivers-$(CONFIG_NET) += net/ 667drivers-y += virt/ 668libs-y := lib/ 669endif # KBUILD_EXTMOD 670 671# The all: target is the default when no target is given on the 672# command line. 673# This allow a user to issue only 'make' to build a kernel including modules 674# Defaults to vmlinux, but the arch makefile usually adds further targets 675all: vmlinux 676 677CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 678ifdef CONFIG_CC_IS_GCC 679CFLAGS_GCOV += -fno-tree-loop-im 680endif 681export CFLAGS_GCOV 682 683# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 684ifdef CONFIG_FUNCTION_TRACER 685 CC_FLAGS_FTRACE := -pg 686endif 687 688ifdef CONFIG_CC_IS_GCC 689RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 690RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 691endif 692ifdef CONFIG_CC_IS_CLANG 693RETPOLINE_CFLAGS := -mretpoline-external-thunk 694RETPOLINE_VDSO_CFLAGS := -mretpoline 695endif 696export RETPOLINE_CFLAGS 697export RETPOLINE_VDSO_CFLAGS 698 699include $(srctree)/arch/$(SRCARCH)/Makefile 700 701ifdef need-config 702ifdef may-sync-config 703# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 704# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 705# because some architectures define CROSS_COMPILE there. 706include include/config/auto.conf.cmd 707 708$(KCONFIG_CONFIG): 709 @echo >&2 '***' 710 @echo >&2 '*** Configuration file "$@" not found!' 711 @echo >&2 '***' 712 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 713 @echo >&2 '*** "make menuconfig" or "make xconfig").' 714 @echo >&2 '***' 715 @/bin/false 716 717# The actual configuration files used during the build are stored in 718# include/generated/ and include/config/. Update them if .config is newer than 719# include/config/auto.conf (which mirrors .config). 720# 721# This exploits the 'multi-target pattern rule' trick. 722# The syncconfig should be executed only once to make all the targets. 723# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 724# 725# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 726# so you cannot notice that Kconfig is waiting for the user input. 727%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 728 $(Q)$(kecho) " SYNC $@" 729 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 730else # !may-sync-config 731# External modules and some install targets need include/generated/autoconf.h 732# and include/config/auto.conf but do not care if they are up-to-date. 733# Use auto.conf to trigger the test 734PHONY += include/config/auto.conf 735 736include/config/auto.conf: 737 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 738 echo >&2; \ 739 echo >&2 " ERROR: Kernel configuration is invalid."; \ 740 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 741 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 742 echo >&2 ; \ 743 /bin/false) 744 745endif # may-sync-config 746endif # need-config 747 748KBUILD_CFLAGS += -fno-delete-null-pointer-checks 749KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 750KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 751KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 752KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 753 754ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 755KBUILD_CFLAGS += -O2 756else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 757KBUILD_CFLAGS += -O3 758else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 759KBUILD_CFLAGS += -Os 760endif 761 762# Tell gcc to never replace conditional load with a non-conditional one 763ifdef CONFIG_CC_IS_GCC 764# gcc-10 renamed --param=allow-store-data-races=0 to 765# -fno-allow-store-data-races. 766KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 767KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 768endif 769 770ifdef CONFIG_READABLE_ASM 771# Disable optimizations that make assembler listings hard to read. 772# reorder blocks reorders the control in the function 773# ipa clone creates specialized cloned functions 774# partial inlining inlines only parts of functions 775KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 776endif 777 778ifneq ($(CONFIG_FRAME_WARN),0) 779KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 780endif 781 782stackp-flags-y := -fno-stack-protector 783stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 784stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 785 786KBUILD_CFLAGS += $(stackp-flags-y) 787 788KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 789KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) 790 791ifdef CONFIG_CC_IS_CLANG 792KBUILD_CPPFLAGS += -Qunused-arguments 793# The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 794KBUILD_CFLAGS += -Wno-gnu 795# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 796# source of a reference will be _MergedGlobals and not on of the whitelisted names. 797# See modpost pattern 2 798KBUILD_CFLAGS += -mno-global-merge 799else 800 801# Warn about unmarked fall-throughs in switch statement. 802# Disabled for clang while comment to attribute conversion happens and 803# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 804KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,) 805# gcc inanely warns about local variables called 'main' 806KBUILD_CFLAGS += -Wno-main 807endif 808 809# These warnings generated too much noise in a regular build. 810# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 811KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 812KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 813 814ifdef CONFIG_FRAME_POINTER 815KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 816else 817# Some targets (ARM with Thumb2, for example), can't be built with frame 818# pointers. For those, we don't have FUNCTION_TRACER automatically 819# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 820# incompatible with -fomit-frame-pointer with current GCC, so we don't use 821# -fomit-frame-pointer with FUNCTION_TRACER. 822ifndef CONFIG_FUNCTION_TRACER 823KBUILD_CFLAGS += -fomit-frame-pointer 824endif 825endif 826 827# Initialize all stack variables with a 0xAA pattern. 828ifdef CONFIG_INIT_STACK_ALL_PATTERN 829KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 830endif 831 832# Initialize all stack variables with a zero value. 833ifdef CONFIG_INIT_STACK_ALL_ZERO 834# Future support for zero initialization is still being debated, see 835# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 836# renamed or dropped. 837KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 838KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 839endif 840 841# While VLAs have been removed, GCC produces unreachable stack probes 842# for the randomize_kstack_offset feature. Disable it for all compilers. 843KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 844 845# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 846ifdef CONFIG_ZERO_CALL_USED_REGS 847KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 848endif 849 850DEBUG_CFLAGS := 851 852ifdef CONFIG_DEBUG_INFO 853 854ifdef CONFIG_DEBUG_INFO_SPLIT 855DEBUG_CFLAGS += -gsplit-dwarf 856else 857DEBUG_CFLAGS += -g 858endif 859 860ifndef CONFIG_AS_IS_LLVM 861KBUILD_AFLAGS += -Wa,-gdwarf-2 862endif 863 864ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 865dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 866dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 867DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 868endif 869 870ifdef CONFIG_DEBUG_INFO_REDUCED 871DEBUG_CFLAGS += -fno-var-tracking 872ifdef CONFIG_CC_IS_GCC 873DEBUG_CFLAGS += -femit-struct-debug-baseonly 874endif 875endif 876 877ifdef CONFIG_DEBUG_INFO_COMPRESSED 878DEBUG_CFLAGS += -gz=zlib 879KBUILD_AFLAGS += -gz=zlib 880KBUILD_LDFLAGS += --compress-debug-sections=zlib 881endif 882 883endif # CONFIG_DEBUG_INFO 884 885KBUILD_CFLAGS += $(DEBUG_CFLAGS) 886export DEBUG_CFLAGS 887 888ifdef CONFIG_FUNCTION_TRACER 889ifdef CONFIG_FTRACE_MCOUNT_USE_CC 890 CC_FLAGS_FTRACE += -mrecord-mcount 891 ifdef CONFIG_HAVE_NOP_MCOUNT 892 ifeq ($(call cc-option-yn, -mnop-mcount),y) 893 CC_FLAGS_FTRACE += -mnop-mcount 894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 895 endif 896 endif 897endif 898ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 899 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 900endif 901ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 902 ifdef CONFIG_HAVE_C_RECORDMCOUNT 903 BUILD_C_RECORDMCOUNT := y 904 export BUILD_C_RECORDMCOUNT 905 endif 906endif 907ifdef CONFIG_HAVE_FENTRY 908 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 909 ifeq ($(call cc-option-yn, -mfentry),y) 910 CC_FLAGS_FTRACE += -mfentry 911 CC_FLAGS_USING += -DCC_USING_FENTRY 912 endif 913endif 914export CC_FLAGS_FTRACE 915KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 916KBUILD_AFLAGS += $(CC_FLAGS_USING) 917endif 918 919# We trigger additional mismatches with less inlining 920ifdef CONFIG_DEBUG_SECTION_MISMATCH 921KBUILD_CFLAGS += -fno-inline-functions-called-once 922endif 923 924ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 925KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 926LDFLAGS_vmlinux += --gc-sections 927endif 928 929ifdef CONFIG_SHADOW_CALL_STACK 930CC_FLAGS_SCS := -fsanitize=shadow-call-stack 931KBUILD_CFLAGS += $(CC_FLAGS_SCS) 932export CC_FLAGS_SCS 933endif 934 935ifdef CONFIG_LTO_CLANG 936ifdef CONFIG_LTO_CLANG_THIN 937CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 938KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 939else 940CC_FLAGS_LTO := -flto 941endif 942CC_FLAGS_LTO += -fvisibility=hidden 943 944# Limit inlining across translation units to reduce binary size 945KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 946 947# Check for frame size exceeding threshold during prolog/epilog insertion 948# when using lld < 13.0.0. 949ifneq ($(CONFIG_FRAME_WARN),0) 950ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 951KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 952endif 953endif 954endif 955 956ifdef CONFIG_LTO 957KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 958KBUILD_AFLAGS += -fno-lto 959export CC_FLAGS_LTO 960endif 961 962ifdef CONFIG_CFI_CLANG 963CC_FLAGS_CFI := -fsanitize=cfi \ 964 -fsanitize-cfi-cross-dso \ 965 -fno-sanitize-cfi-canonical-jump-tables \ 966 -fno-sanitize-trap=cfi \ 967 -fno-sanitize-blacklist 968 969ifdef CONFIG_CFI_PERMISSIVE 970CC_FLAGS_CFI += -fsanitize-recover=cfi 971endif 972 973# If LTO flags are filtered out, we must also filter out CFI. 974CC_FLAGS_LTO += $(CC_FLAGS_CFI) 975KBUILD_CFLAGS += $(CC_FLAGS_CFI) 976export CC_FLAGS_CFI 977endif 978 979ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 980KBUILD_CFLAGS += -falign-functions=64 981endif 982 983# arch Makefile may override CC so keep this after arch Makefile is included 984NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 985 986# warn about C99 declaration after statement 987KBUILD_CFLAGS += -Wdeclaration-after-statement 988 989# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 990KBUILD_CFLAGS += -Wvla 991 992# disable pointer signed / unsigned warnings in gcc 4.0 993KBUILD_CFLAGS += -Wno-pointer-sign 994 995# disable stringop warnings in gcc 8+ 996KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 997 998# We'll want to enable this eventually, but it's not going away for 5.7 at least 999KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 1000KBUILD_CFLAGS += -Wno-array-bounds 1001KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1002 1003# Another good warning that we'll want to enable eventually 1004KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1005 1006# Enabled with W=2, disabled by default as noisy 1007ifdef CONFIG_CC_IS_GCC 1008KBUILD_CFLAGS += -Wno-maybe-uninitialized 1009endif 1010 1011# disable invalid "can't wrap" optimizations for signed / pointers 1012KBUILD_CFLAGS += -fno-strict-overflow 1013 1014# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1015KBUILD_CFLAGS += -fno-stack-check 1016 1017# conserve stack if available 1018ifdef CONFIG_CC_IS_GCC 1019KBUILD_CFLAGS += -fconserve-stack 1020endif 1021 1022# Prohibit date/time macros, which would make the build non-deterministic 1023KBUILD_CFLAGS += -Werror=date-time 1024 1025# enforce correct pointer usage 1026KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1027 1028# Require designated initializers for all marked structures 1029KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1030 1031# change __FILE__ to the relative path from the srctree 1032KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1033 1034# include additional Makefiles when needed 1035include-y := scripts/Makefile.extrawarn 1036include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1037include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1038include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1039include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1040include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1041 1042include $(addprefix $(srctree)/, $(include-y)) 1043 1044# scripts/Makefile.gcc-plugins is intentionally included last. 1045# Do not add $(call cc-option,...) below this line. When you build the kernel 1046# from the clean source tree, the GCC plugins do not exist at this point. 1047 1048# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1049KBUILD_CPPFLAGS += $(KCPPFLAGS) 1050KBUILD_AFLAGS += $(KAFLAGS) 1051KBUILD_CFLAGS += $(KCFLAGS) 1052 1053KBUILD_LDFLAGS_MODULE += --build-id=sha1 1054LDFLAGS_vmlinux += --build-id=sha1 1055 1056ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1057LDFLAGS_vmlinux += $(call ld-option, -X,) 1058endif 1059 1060ifeq ($(CONFIG_RELR),y) 1061LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1062endif 1063 1064# We never want expected sections to be placed heuristically by the 1065# linker. All sections should be explicitly named in the linker script. 1066ifdef CONFIG_LD_ORPHAN_WARN 1067LDFLAGS_vmlinux += --orphan-handling=warn 1068endif 1069 1070# Align the bit size of userspace programs with the kernel 1071KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1072KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1073 1074# make the checker run with the right architecture 1075CHECKFLAGS += --arch=$(ARCH) 1076 1077# insure the checker run with the right endianness 1078CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1079 1080# the checker needs the correct machine size 1081CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1082 1083# Default kernel image to build when no specific target is given. 1084# KBUILD_IMAGE may be overruled on the command line or 1085# set in the environment 1086# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1087# this default value 1088export KBUILD_IMAGE ?= vmlinux 1089 1090# 1091# INSTALL_PATH specifies where to place the updated kernel and system map 1092# images. Default is /boot, but you can set it to other values 1093export INSTALL_PATH ?= /boot 1094 1095# 1096# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1097# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1098# an argument if needed. Otherwise it defaults to the kernel install path 1099# 1100export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1101 1102# 1103# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1104# relocations required by build roots. This is not defined in the 1105# makefile but the argument can be passed to make if needed. 1106# 1107 1108MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1109export MODLIB 1110 1111PHONY += prepare0 1112 1113export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1114export MODORDER := $(extmod_prefix)modules.order 1115export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1116 1117ifeq ($(KBUILD_EXTMOD),) 1118core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1119 1120vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1121 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1122 $(libs-y) $(libs-m))) 1123 1124vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1125 $(patsubst %/,%,$(filter %/, $(core-) \ 1126 $(drivers-) $(libs-)))) 1127 1128subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1129 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1130 $(drivers-y) $(drivers-m))) 1131 1132build-dirs := $(vmlinux-dirs) 1133clean-dirs := $(vmlinux-alldirs) 1134 1135# Externally visible symbols (used by link-vmlinux.sh) 1136KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1137KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1138ifdef CONFIG_MODULES 1139KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1140KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1141else 1142KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1143endif 1144KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1145 1146export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1147export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1148# used by scripts/Makefile.package 1149export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1150 1151vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1152 1153# Recurse until adjust_autoksyms.sh is satisfied 1154PHONY += autoksyms_recursive 1155ifdef CONFIG_TRIM_UNUSED_KSYMS 1156# For the kernel to actually contain only the needed exported symbols, 1157# we have to build modules as well to determine what those symbols are. 1158# (this can be evaluated only once include/config/auto.conf has been included) 1159KBUILD_MODULES := 1 1160 1161autoksyms_recursive: descend modules.order 1162 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1163 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1164endif 1165 1166autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1167 1168quiet_cmd_autoksyms_h = GEN $@ 1169 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1170 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1171 1172$(autoksyms_h): 1173 $(call cmd,autoksyms_h) 1174 1175ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1176 1177# Final link of vmlinux with optional arch pass after final link 1178cmd_link-vmlinux = \ 1179 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1180 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1181 1182vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1183 +$(call if_changed_dep,link-vmlinux) 1184 1185targets := vmlinux 1186 1187# The actual objects are generated when descending, 1188# make sure no implicit rule kicks in 1189$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1190 1191filechk_kernel.release = \ 1192 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1193 1194# Store (new) KERNELRELEASE string in include/config/kernel.release 1195include/config/kernel.release: FORCE 1196 $(call filechk,kernel.release) 1197 1198# Additional helpers built in scripts/ 1199# Carefully list dependencies so we do not try to build scripts twice 1200# in parallel 1201PHONY += scripts 1202scripts: scripts_basic scripts_dtc 1203 $(Q)$(MAKE) $(build)=$(@) 1204 1205# Things we need to do before we recursively start building the kernel 1206# or the modules are listed in "prepare". 1207# A multi level approach is used. prepareN is processed before prepareN-1. 1208# archprepare is used in arch Makefiles and when processed asm symlink, 1209# version.h and scripts_basic is processed / created. 1210 1211PHONY += prepare archprepare 1212 1213archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1214 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1215 include/generated/autoconf.h remove-stale-files 1216 1217prepare0: archprepare 1218 $(Q)$(MAKE) $(build)=scripts/mod 1219 $(Q)$(MAKE) $(build)=. 1220 1221# All the preparing.. 1222prepare: prepare0 1223 1224PHONY += remove-stale-files 1225remove-stale-files: 1226 $(Q)$(srctree)/scripts/remove-stale-files 1227 1228# Support for using generic headers in asm-generic 1229asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1230 1231PHONY += asm-generic uapi-asm-generic 1232asm-generic: uapi-asm-generic 1233 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1234 generic=include/asm-generic 1235uapi-asm-generic: 1236 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1237 generic=include/uapi/asm-generic 1238 1239# Generate some files 1240# --------------------------------------------------------------------------- 1241 1242# KERNELRELEASE can change from a few different places, meaning version.h 1243# needs to be updated, so this check is forced on all builds 1244 1245uts_len := 64 1246define filechk_utsrelease.h 1247 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1248 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1249 exit 1; \ 1250 fi; \ 1251 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1252endef 1253 1254define filechk_version.h 1255 if [ $(SUBLEVEL) -gt 255 ]; then \ 1256 echo \#define LINUX_VERSION_CODE $(shell \ 1257 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1258 else \ 1259 echo \#define LINUX_VERSION_CODE $(shell \ 1260 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1261 fi; \ 1262 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1263 ((c) > 255 ? 255 : (c)))'; \ 1264 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1265 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1266 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1267endef 1268 1269$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1270$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1271$(version_h): FORCE 1272 $(call filechk,version.h) 1273 1274include/generated/utsrelease.h: include/config/kernel.release FORCE 1275 $(call filechk,utsrelease.h) 1276 1277PHONY += headerdep 1278headerdep: 1279 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1280 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1281 1282# --------------------------------------------------------------------------- 1283# Kernel headers 1284 1285#Default location for installed headers 1286export INSTALL_HDR_PATH = $(objtree)/usr 1287 1288quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1289 cmd_headers_install = \ 1290 mkdir -p $(INSTALL_HDR_PATH); \ 1291 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1292 usr/include $(INSTALL_HDR_PATH) 1293 1294PHONY += headers_install 1295headers_install: headers 1296 $(call cmd,headers_install) 1297 1298PHONY += archheaders archscripts 1299 1300hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1301 1302PHONY += headers 1303headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1304 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1305 $(error Headers not exportable for the $(SRCARCH) architecture)) 1306 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1307 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1308 1309# Deprecated. It is no-op now. 1310PHONY += headers_check 1311headers_check: 1312 @echo >&2 "=================== WARNING ===================" 1313 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1314 @echo >&2 "and will be removed after Linux 5.15 release." 1315 @echo >&2 "Please remove headers_check from your scripts." 1316 @echo >&2 "===============================================" 1317 1318ifdef CONFIG_HEADERS_INSTALL 1319prepare: headers 1320endif 1321 1322PHONY += scripts_unifdef 1323scripts_unifdef: scripts_basic 1324 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1325 1326# --------------------------------------------------------------------------- 1327# Install 1328 1329# Many distributions have the custom install script, /sbin/installkernel. 1330# If DKMS is installed, 'make install' will eventually recuses back 1331# to the this Makefile to build and install external modules. 1332# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1333 1334install: sub_make_done := 1335 1336# --------------------------------------------------------------------------- 1337# Tools 1338 1339ifdef CONFIG_STACK_VALIDATION 1340prepare: tools/objtool 1341endif 1342 1343ifdef CONFIG_BPF 1344ifdef CONFIG_DEBUG_INFO_BTF 1345prepare: tools/bpf/resolve_btfids 1346endif 1347endif 1348 1349PHONY += resolve_btfids_clean 1350 1351resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1352 1353# tools/bpf/resolve_btfids directory might not exist 1354# in output directory, skip its clean in that case 1355resolve_btfids_clean: 1356ifneq ($(wildcard $(resolve_btfids_O)),) 1357 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1358endif 1359 1360# Clear a bunch of variables before executing the submake 1361ifeq ($(quiet),silent_) 1362tools_silent=s 1363endif 1364 1365tools/: FORCE 1366 $(Q)mkdir -p $(objtree)/tools 1367 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1368 1369tools/%: FORCE 1370 $(Q)mkdir -p $(objtree)/tools 1371 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1372 1373# --------------------------------------------------------------------------- 1374# Kernel selftest 1375 1376PHONY += kselftest 1377kselftest: 1378 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1379 1380kselftest-%: FORCE 1381 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1382 1383PHONY += kselftest-merge 1384kselftest-merge: 1385 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1386 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1387 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1388 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1389 1390# --------------------------------------------------------------------------- 1391# Devicetree files 1392 1393ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1394dtstree := arch/$(SRCARCH)/boot/dts 1395endif 1396 1397ifneq ($(dtstree),) 1398 1399%.dtb: include/config/kernel.release scripts_dtc 1400 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1401 1402%.dtbo: include/config/kernel.release scripts_dtc 1403 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1404 1405PHONY += dtbs dtbs_install dtbs_check 1406dtbs: include/config/kernel.release scripts_dtc 1407 $(Q)$(MAKE) $(build)=$(dtstree) 1408 1409ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1410export CHECK_DTBS=y 1411dtbs: dt_binding_check 1412endif 1413 1414dtbs_check: dtbs 1415 1416dtbs_install: 1417 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1418 1419ifdef CONFIG_OF_EARLY_FLATTREE 1420all: dtbs 1421endif 1422 1423endif 1424 1425PHONY += scripts_dtc 1426scripts_dtc: scripts_basic 1427 $(Q)$(MAKE) $(build)=scripts/dtc 1428 1429ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1430export CHECK_DT_BINDING=y 1431endif 1432 1433PHONY += dt_binding_check 1434dt_binding_check: scripts_dtc 1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1436 1437# --------------------------------------------------------------------------- 1438# Modules 1439 1440ifdef CONFIG_MODULES 1441 1442# By default, build modules as well 1443 1444all: modules 1445 1446# When we're building modules with modversions, we need to consider 1447# the built-in objects during the descend as well, in order to 1448# make sure the checksums are up to date before we record them. 1449ifdef CONFIG_MODVERSIONS 1450 KBUILD_BUILTIN := 1 1451endif 1452 1453# Build modules 1454# 1455# A module can be listed more than once in obj-m resulting in 1456# duplicate lines in modules.order files. Those are removed 1457# using awk while concatenating to the final file. 1458 1459PHONY += modules 1460modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1461 1462cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1463 1464modules.order: $(subdir-modorder) FORCE 1465 $(call if_changed,modules_order) 1466 1467targets += modules.order 1468 1469# Target to prepare building external modules 1470PHONY += modules_prepare 1471modules_prepare: prepare 1472 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1473 1474export modules_sign_only := 1475 1476ifeq ($(CONFIG_MODULE_SIG),y) 1477PHONY += modules_sign 1478modules_sign: modules_install 1479 @: 1480 1481# modules_sign is a subset of modules_install. 1482# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1483ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1484modules_sign_only := y 1485endif 1486endif 1487 1488modinst_pre := 1489ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1490modinst_pre := __modinst_pre 1491endif 1492 1493modules_install: $(modinst_pre) 1494PHONY += __modinst_pre 1495__modinst_pre: 1496 @rm -rf $(MODLIB)/kernel 1497 @rm -f $(MODLIB)/source 1498 @mkdir -p $(MODLIB)/kernel 1499 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1500 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1501 rm -f $(MODLIB)/build ; \ 1502 ln -s $(CURDIR) $(MODLIB)/build ; \ 1503 fi 1504 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1505 @cp -f modules.builtin $(MODLIB)/ 1506 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1507 1508endif # CONFIG_MODULES 1509 1510### 1511# Cleaning is done on three levels. 1512# make clean Delete most generated files 1513# Leave enough to build external modules 1514# make mrproper Delete the current configuration, and all generated files 1515# make distclean Remove editor backup files, patch leftover files and the like 1516 1517# Directories & files removed with 'make clean' 1518CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1519 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1520 compile_commands.json .thinlto-cache 1521 1522# Directories & files removed with 'make mrproper' 1523MRPROPER_FILES += include/config include/generated \ 1524 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1525 debian snap tar-install \ 1526 .config .config.old .version \ 1527 Module.symvers \ 1528 certs/signing_key.pem certs/signing_key.x509 \ 1529 certs/x509.genkey \ 1530 vmlinux-gdb.py \ 1531 *.spec 1532 1533# clean - Delete most, but leave enough to build external modules 1534# 1535clean: rm-files := $(CLEAN_FILES) 1536 1537PHONY += archclean vmlinuxclean 1538 1539vmlinuxclean: 1540 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1541 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1542 1543clean: archclean vmlinuxclean resolve_btfids_clean 1544 1545# mrproper - Delete all generated files, including .config 1546# 1547mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1548mrproper-dirs := $(addprefix _mrproper_,scripts) 1549 1550PHONY += $(mrproper-dirs) mrproper 1551$(mrproper-dirs): 1552 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1553 1554mrproper: clean $(mrproper-dirs) 1555 $(call cmd,rmfiles) 1556 1557# distclean 1558# 1559PHONY += distclean 1560 1561distclean: mrproper 1562 @find . $(RCS_FIND_IGNORE) \ 1563 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1564 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1565 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1566 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1567 -type f -print | xargs rm -f 1568 1569 1570# Packaging of the kernel to various formats 1571# --------------------------------------------------------------------------- 1572 1573%src-pkg: FORCE 1574 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1575%pkg: include/config/kernel.release FORCE 1576 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1577 1578# Brief documentation of the typical targets used 1579# --------------------------------------------------------------------------- 1580 1581boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1582boards := $(sort $(notdir $(boards))) 1583board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1584board-dirs := $(sort $(notdir $(board-dirs:/=))) 1585 1586PHONY += help 1587help: 1588 @echo 'Cleaning targets:' 1589 @echo ' clean - Remove most generated files but keep the config and' 1590 @echo ' enough build support to build external modules' 1591 @echo ' mrproper - Remove all generated files + config + various backup files' 1592 @echo ' distclean - mrproper + remove editor backup and patch files' 1593 @echo '' 1594 @echo 'Configuration targets:' 1595 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1596 @echo '' 1597 @echo 'Other generic targets:' 1598 @echo ' all - Build all targets marked with [*]' 1599 @echo '* vmlinux - Build the bare kernel' 1600 @echo '* modules - Build all modules' 1601 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1602 @echo ' dir/ - Build all files in dir and below' 1603 @echo ' dir/file.[ois] - Build specified target only' 1604 @echo ' dir/file.ll - Build the LLVM assembly file' 1605 @echo ' (requires compiler support for LLVM assembly generation)' 1606 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1607 @echo ' (requires a recent binutils and recent build (System.map))' 1608 @echo ' dir/file.ko - Build module including final link' 1609 @echo ' modules_prepare - Set up for building external modules' 1610 @echo ' tags/TAGS - Generate tags file for editors' 1611 @echo ' cscope - Generate cscope index' 1612 @echo ' gtags - Generate GNU GLOBAL index' 1613 @echo ' kernelrelease - Output the release version string (use with make -s)' 1614 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1615 @echo ' image_name - Output the image name (use with make -s)' 1616 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1617 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1618 echo '' 1619 @echo 'Static analysers:' 1620 @echo ' checkstack - Generate a list of stack hogs' 1621 @echo ' versioncheck - Sanity check on version.h usage' 1622 @echo ' includecheck - Check for duplicate included header files' 1623 @echo ' export_report - List the usages of all exported symbols' 1624 @echo ' headerdep - Detect inclusion cycles in headers' 1625 @echo ' coccicheck - Check with Coccinelle' 1626 @echo ' clang-analyzer - Check with clang static analyzer' 1627 @echo ' clang-tidy - Check with clang-tidy' 1628 @echo '' 1629 @echo 'Tools:' 1630 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1631 @echo '' 1632 @echo 'Kernel selftest:' 1633 @echo ' kselftest - Build and run kernel selftest' 1634 @echo ' Build, install, and boot kernel before' 1635 @echo ' running kselftest on it' 1636 @echo ' Run as root for full coverage' 1637 @echo ' kselftest-all - Build kernel selftest' 1638 @echo ' kselftest-install - Build and install kernel selftest' 1639 @echo ' kselftest-clean - Remove all generated kselftest files' 1640 @echo ' kselftest-merge - Merge all the config dependencies of' 1641 @echo ' kselftest to existing .config.' 1642 @echo '' 1643 @$(if $(dtstree), \ 1644 echo 'Devicetree:'; \ 1645 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1646 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1647 echo ' dt_binding_check - Validate device tree binding documents'; \ 1648 echo ' dtbs_check - Validate device tree source files';\ 1649 echo '') 1650 1651 @echo 'Userspace tools targets:' 1652 @echo ' use "make tools/help"' 1653 @echo ' or "cd tools; make help"' 1654 @echo '' 1655 @echo 'Kernel packaging:' 1656 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1657 @echo '' 1658 @echo 'Documentation targets:' 1659 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1660 @echo '' 1661 @echo 'Architecture specific targets ($(SRCARCH)):' 1662 @$(if $(archhelp),$(archhelp),\ 1663 echo ' No architecture specific help defined for $(SRCARCH)') 1664 @echo '' 1665 @$(if $(boards), \ 1666 $(foreach b, $(boards), \ 1667 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1668 echo '') 1669 @$(if $(board-dirs), \ 1670 $(foreach b, $(board-dirs), \ 1671 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1672 printf " %-16s - Show all of the above\\n" help-boards; \ 1673 echo '') 1674 1675 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1676 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1677 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1678 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1679 @echo ' (sparse by default)' 1680 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1681 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1682 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1683 @echo ' 1: warnings which may be relevant and do not occur too often' 1684 @echo ' 2: warnings which occur quite often but may still be relevant' 1685 @echo ' 3: more obscure warnings, can most likely be ignored' 1686 @echo ' Multiple levels can be combined with W=12 or W=123' 1687 @echo '' 1688 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1689 @echo 'For further info see the ./README file' 1690 1691 1692help-board-dirs := $(addprefix help-,$(board-dirs)) 1693 1694help-boards: $(help-board-dirs) 1695 1696boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1697 1698$(help-board-dirs): help-%: 1699 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1700 @$(if $(boards-per-dir), \ 1701 $(foreach b, $(boards-per-dir), \ 1702 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1703 echo '') 1704 1705 1706# Documentation targets 1707# --------------------------------------------------------------------------- 1708DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1709 linkcheckdocs dochelp refcheckdocs 1710PHONY += $(DOC_TARGETS) 1711$(DOC_TARGETS): 1712 $(Q)$(MAKE) $(build)=Documentation $@ 1713 1714# Misc 1715# --------------------------------------------------------------------------- 1716 1717PHONY += scripts_gdb 1718scripts_gdb: prepare0 1719 $(Q)$(MAKE) $(build)=scripts/gdb 1720 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1721 1722ifdef CONFIG_GDB_SCRIPTS 1723all: scripts_gdb 1724endif 1725 1726else # KBUILD_EXTMOD 1727 1728### 1729# External module support. 1730# When building external modules the kernel used as basis is considered 1731# read-only, and no consistency checks are made and the make 1732# system is not used on the basis kernel. If updates are required 1733# in the basis kernel ordinary make commands (without M=...) must be used. 1734 1735# We are always building only modules. 1736KBUILD_BUILTIN := 1737KBUILD_MODULES := 1 1738 1739build-dirs := $(KBUILD_EXTMOD) 1740$(MODORDER): descend 1741 @: 1742 1743compile_commands.json: $(extmod_prefix)compile_commands.json 1744PHONY += compile_commands.json 1745 1746clean-dirs := $(KBUILD_EXTMOD) 1747clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1748 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1749 1750PHONY += prepare 1751# now expand this into a simple variable to reduce the cost of shell evaluations 1752prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1753prepare: 1754 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \ 1755 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1756 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \ 1757 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1758 fi 1759 1760PHONY += help 1761help: 1762 @echo ' Building external modules.' 1763 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1764 @echo '' 1765 @echo ' modules - default target, build the module(s)' 1766 @echo ' modules_install - install the module' 1767 @echo ' clean - remove generated files in module directory only' 1768 @echo '' 1769 1770# no-op for external module builds 1771PHONY += modules_prepare 1772 1773endif # KBUILD_EXTMOD 1774 1775# --------------------------------------------------------------------------- 1776# Modules 1777 1778PHONY += modules modules_install 1779 1780ifdef CONFIG_MODULES 1781 1782modules: modules_check 1783 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1784 1785PHONY += modules_check 1786modules_check: $(MODORDER) 1787 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1788 1789quiet_cmd_depmod = DEPMOD $(MODLIB) 1790 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1791 $(KERNELRELEASE) 1792 1793modules_install: 1794 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1795 $(call cmd,depmod) 1796 1797else # CONFIG_MODULES 1798 1799# Modules not configured 1800# --------------------------------------------------------------------------- 1801 1802modules modules_install: 1803 @echo >&2 '***' 1804 @echo >&2 '*** The present kernel configuration has modules disabled.' 1805 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1806 @echo >&2 '*** to enable CONFIG_MODULES.' 1807 @echo >&2 '***' 1808 @exit 1 1809 1810endif # CONFIG_MODULES 1811 1812# Single targets 1813# --------------------------------------------------------------------------- 1814# To build individual files in subdirectories, you can do like this: 1815# 1816# make foo/bar/baz.s 1817# 1818# The supported suffixes for single-target are listed in 'single-targets' 1819# 1820# To build only under specific subdirectories, you can do like this: 1821# 1822# make foo/bar/baz/ 1823 1824ifdef single-build 1825 1826# .ko is special because modpost is needed 1827single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1828single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1829 1830$(single-ko): single_modpost 1831 @: 1832$(single-no-ko): descend 1833 @: 1834 1835ifeq ($(KBUILD_EXTMOD),) 1836# For the single build of in-tree modules, use a temporary file to avoid 1837# the situation of modules_install installing an invalid modules.order. 1838MODORDER := .modules.tmp 1839endif 1840 1841PHONY += single_modpost 1842single_modpost: $(single-no-ko) modules_prepare 1843 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1844 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1845 1846KBUILD_MODULES := 1 1847 1848export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1849 1850# trim unrelated directories 1851build-dirs := $(foreach d, $(build-dirs), \ 1852 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1853 1854endif 1855 1856ifndef CONFIG_MODULES 1857KBUILD_MODULES := 1858endif 1859 1860# Handle descending into subdirectories listed in $(build-dirs) 1861# Preset locale variables to speed up the build process. Limit locale 1862# tweaks to this spot to avoid wrong language settings when running 1863# make menuconfig etc. 1864# Error messages still appears in the original language 1865PHONY += descend $(build-dirs) 1866descend: $(build-dirs) 1867$(build-dirs): prepare 1868 $(Q)$(MAKE) $(build)=$@ \ 1869 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1870 need-builtin=1 need-modorder=1 1871 1872clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1873PHONY += $(clean-dirs) clean 1874$(clean-dirs): 1875 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1876 1877clean: $(clean-dirs) 1878 $(call cmd,rmfiles) 1879 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1880 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1881 -o -name '*.ko.*' \ 1882 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1883 -o -name '*.dwo' -o -name '*.lst' \ 1884 -o -name '*.su' -o -name '*.mod' \ 1885 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1886 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1887 -o -name '*.asn1.[ch]' \ 1888 -o -name '*.symtypes' -o -name 'modules.order' \ 1889 -o -name '.tmp_*.o.*' \ 1890 -o -name '*.c.[012]*.*' \ 1891 -o -name '*.ll' \ 1892 -o -name '*.gcno' \ 1893 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1894 1895# Generate tags for editors 1896# --------------------------------------------------------------------------- 1897quiet_cmd_tags = GEN $@ 1898 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1899 1900tags TAGS cscope gtags: FORCE 1901 $(call cmd,tags) 1902 1903# Script to generate missing namespace dependencies 1904# --------------------------------------------------------------------------- 1905 1906PHONY += nsdeps 1907nsdeps: export KBUILD_NSDEPS=1 1908nsdeps: modules 1909 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1910 1911# Clang Tooling 1912# --------------------------------------------------------------------------- 1913 1914quiet_cmd_gen_compile_commands = GEN $@ 1915 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1916 1917$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1918 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1919 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1920 $(call if_changed,gen_compile_commands) 1921 1922targets += $(extmod_prefix)compile_commands.json 1923 1924PHONY += clang-tidy clang-analyzer 1925 1926ifdef CONFIG_CC_IS_CLANG 1927quiet_cmd_clang_tools = CHECK $< 1928 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1929 1930clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1931 $(call cmd,clang_tools) 1932else 1933clang-tidy clang-analyzer: 1934 @echo "$@ requires CC=clang" >&2 1935 @false 1936endif 1937 1938# Scripts to check various things for consistency 1939# --------------------------------------------------------------------------- 1940 1941PHONY += includecheck versioncheck coccicheck export_report 1942 1943includecheck: 1944 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1945 -name '*.[hcS]' -type f -print | sort \ 1946 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1947 1948versioncheck: 1949 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1950 -name '*.[hcS]' -type f -print | sort \ 1951 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1952 1953coccicheck: 1954 $(Q)$(BASH) $(srctree)/scripts/$@ 1955 1956export_report: 1957 $(PERL) $(srctree)/scripts/export_report.pl 1958 1959PHONY += checkstack kernelrelease kernelversion image_name 1960 1961# UML needs a little special treatment here. It wants to use the host 1962# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1963# else wants $(ARCH), including people doing cross-builds, which means 1964# that $(SUBARCH) doesn't work here. 1965ifeq ($(ARCH), um) 1966CHECKSTACK_ARCH := $(SUBARCH) 1967else 1968CHECKSTACK_ARCH := $(ARCH) 1969endif 1970checkstack: 1971 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1972 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1973 1974kernelrelease: 1975 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1976 1977kernelversion: 1978 @echo $(KERNELVERSION) 1979 1980image_name: 1981 @echo $(KBUILD_IMAGE) 1982 1983quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1984 cmd_rmfiles = rm -rf $(rm-files) 1985 1986# read saved command lines for existing targets 1987existing-targets := $(wildcard $(sort $(targets))) 1988 1989-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1990 1991endif # config-build 1992endif # mixed-build 1993endif # need-sub-make 1994 1995PHONY += FORCE 1996FORCE: 1997 1998# Declare the contents of the PHONY variable as phony. We keep that 1999# information in a variable so we can use it in if_changed and friends. 2000.PHONY: $(PHONY) 2001
