1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Superb Owl 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 434KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 435 -O2 -fomit-frame-pointer -std=gnu89 436KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 437KBUILD_USERLDFLAGS := $(USERLDFLAGS) 438 439KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 440KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 441KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 442KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 443 444# Make variables (CC, etc...) 445CPP = $(CC) -E 446ifneq ($(LLVM),) 447CC = clang 448LD = ld.lld 449AR = llvm-ar 450NM = llvm-nm 451OBJCOPY = llvm-objcopy 452OBJDUMP = llvm-objdump 453READELF = llvm-readelf 454STRIP = llvm-strip 455else 456CC = $(CROSS_COMPILE)gcc 457LD = $(CROSS_COMPILE)ld 458AR = $(CROSS_COMPILE)ar 459NM = $(CROSS_COMPILE)nm 460OBJCOPY = $(CROSS_COMPILE)objcopy 461OBJDUMP = $(CROSS_COMPILE)objdump 462READELF = $(CROSS_COMPILE)readelf 463STRIP = $(CROSS_COMPILE)strip 464endif 465PAHOLE = pahole 466RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 467LEX = flex 468YACC = bison 469AWK = awk 470INSTALLKERNEL := installkernel 471DEPMOD = depmod 472PERL = perl 473PYTHON3 = python3 474CHECK = sparse 475BASH = bash 476KGZIP = gzip 477KBZIP2 = bzip2 478KLZOP = lzop 479LZMA = lzma 480LZ4 = lz4c 481XZ = xz 482ZSTD = zstd 483 484PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 485 486CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 487 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 488NOSTDINC_FLAGS := 489CFLAGS_MODULE = 490AFLAGS_MODULE = 491LDFLAGS_MODULE = 492CFLAGS_KERNEL = 493AFLAGS_KERNEL = 494LDFLAGS_vmlinux = 495 496# Use USERINCLUDE when you must reference the UAPI directories only. 497USERINCLUDE := \ 498 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 499 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 500 -I$(srctree)/include/uapi \ 501 -I$(objtree)/include/generated/uapi \ 502 -include $(srctree)/include/linux/compiler-version.h \ 503 -include $(srctree)/include/linux/kconfig.h 504 505# Use LINUXINCLUDE when you must reference the include/ directory. 506# Needed to be compatible with the O= option 507LINUXINCLUDE := \ 508 -I$(srctree)/arch/$(SRCARCH)/include \ 509 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 510 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 511 -I$(objtree)/include \ 512 $(USERINCLUDE) 513 514KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 515KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 516 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 517 -Werror=implicit-function-declaration -Werror=implicit-int \ 518 -Werror=return-type -Wno-format-security \ 519 -std=gnu89 520KBUILD_CPPFLAGS := -D__KERNEL__ 521KBUILD_AFLAGS_KERNEL := 522KBUILD_CFLAGS_KERNEL := 523KBUILD_AFLAGS_MODULE := -DMODULE 524KBUILD_CFLAGS_MODULE := -DMODULE 525KBUILD_LDFLAGS_MODULE := 526KBUILD_LDFLAGS := 527CLANG_FLAGS := 528 529export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 530export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 531export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 532export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 533export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 534export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 535 536export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 537export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 538export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 539export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 540export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 541export PAHOLE_FLAGS 542 543# Files to ignore in find ... statements 544 545export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 546 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 547 -prune -o 548export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 549 --exclude CVS --exclude .pc --exclude .hg --exclude .git 550 551# =========================================================================== 552# Rules shared between *config targets and build targets 553 554# Basic helpers built in scripts/basic/ 555PHONY += scripts_basic 556scripts_basic: 557 $(Q)$(MAKE) $(build)=scripts/basic 558 559PHONY += outputmakefile 560ifdef building_out_of_srctree 561# Before starting out-of-tree build, make sure the source tree is clean. 562# outputmakefile generates a Makefile in the output directory, if using a 563# separate output directory. This allows convenient use of make in the 564# output directory. 565# At the same time when output Makefile generated, generate .gitignore to 566# ignore whole output directory 567 568quiet_cmd_makefile = GEN Makefile 569 cmd_makefile = { \ 570 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 571 echo "include $(srctree)/Makefile"; \ 572 } > Makefile 573 574outputmakefile: 575 $(Q)if [ -f $(srctree)/.config -o \ 576 -d $(srctree)/include/config -o \ 577 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 578 echo >&2 "***"; \ 579 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 580 echo >&2 "*** in $(abs_srctree)";\ 581 echo >&2 "***"; \ 582 false; \ 583 fi 584 $(Q)ln -fsn $(srctree) source 585 $(call cmd,makefile) 586 $(Q)test -e .gitignore || \ 587 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 588endif 589 590# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 591# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 592# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 593# and from include/config/auto.conf.cmd to detect the compiler upgrade. 594CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 595 596ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 597include $(srctree)/scripts/Makefile.clang 598endif 599 600# Include this also for config targets because some architectures need 601# cc-cross-prefix to determine CROSS_COMPILE. 602ifdef need-compiler 603include $(srctree)/scripts/Makefile.compiler 604endif 605 606ifdef config-build 607# =========================================================================== 608# *config targets only - make sure prerequisites are updated, and descend 609# in scripts/kconfig to make the *config target 610 611# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 612# KBUILD_DEFCONFIG may point out an alternative default configuration 613# used for 'make defconfig' 614include $(srctree)/arch/$(SRCARCH)/Makefile 615export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 616 617config: outputmakefile scripts_basic FORCE 618 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 619 620%config: outputmakefile scripts_basic FORCE 621 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 622 623else #!config-build 624# =========================================================================== 625# Build targets only - this includes vmlinux, arch specific targets, clean 626# targets and others. In general all targets except *config targets. 627 628# If building an external module we do not care about the all: rule 629# but instead __all depend on modules 630PHONY += all 631ifeq ($(KBUILD_EXTMOD),) 632__all: all 633else 634__all: modules 635endif 636 637# Decide whether to build built-in, modular, or both. 638# Normally, just do built-in. 639 640KBUILD_MODULES := 641KBUILD_BUILTIN := 1 642 643# If we have only "make modules", don't compile built-in objects. 644ifeq ($(MAKECMDGOALS),modules) 645 KBUILD_BUILTIN := 646endif 647 648# If we have "make <whatever> modules", compile modules 649# in addition to whatever we do anyway. 650# Just "make" or "make all" shall build modules as well 651 652ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 653 KBUILD_MODULES := 1 654endif 655 656ifeq ($(MAKECMDGOALS),) 657 KBUILD_MODULES := 1 658endif 659 660export KBUILD_MODULES KBUILD_BUILTIN 661 662ifdef need-config 663include include/config/auto.conf 664endif 665 666ifeq ($(KBUILD_EXTMOD),) 667# Objects we will link into vmlinux / subdirs we need to visit 668core-y := init/ usr/ arch/$(SRCARCH)/ 669drivers-y := drivers/ sound/ 670drivers-$(CONFIG_SAMPLES) += samples/ 671drivers-$(CONFIG_NET) += net/ 672drivers-y += virt/ 673libs-y := lib/ 674endif # KBUILD_EXTMOD 675 676# The all: target is the default when no target is given on the 677# command line. 678# This allow a user to issue only 'make' to build a kernel including modules 679# Defaults to vmlinux, but the arch makefile usually adds further targets 680all: vmlinux 681 682CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 683ifdef CONFIG_CC_IS_GCC 684CFLAGS_GCOV += -fno-tree-loop-im 685endif 686export CFLAGS_GCOV 687 688# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 689ifdef CONFIG_FUNCTION_TRACER 690 CC_FLAGS_FTRACE := -pg 691endif 692 693include $(srctree)/arch/$(SRCARCH)/Makefile 694 695ifdef need-config 696ifdef may-sync-config 697# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 698# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 699# because some architectures define CROSS_COMPILE there. 700include include/config/auto.conf.cmd 701 702$(KCONFIG_CONFIG): 703 @echo >&2 '***' 704 @echo >&2 '*** Configuration file "$@" not found!' 705 @echo >&2 '***' 706 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 707 @echo >&2 '*** "make menuconfig" or "make xconfig").' 708 @echo >&2 '***' 709 @/bin/false 710 711# The actual configuration files used during the build are stored in 712# include/generated/ and include/config/. Update them if .config is newer than 713# include/config/auto.conf (which mirrors .config). 714# 715# This exploits the 'multi-target pattern rule' trick. 716# The syncconfig should be executed only once to make all the targets. 717# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 718# 719# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 720# so you cannot notice that Kconfig is waiting for the user input. 721%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 722 $(Q)$(kecho) " SYNC $@" 723 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 724else # !may-sync-config 725# External modules and some install targets need include/generated/autoconf.h 726# and include/config/auto.conf but do not care if they are up-to-date. 727# Use auto.conf to trigger the test 728PHONY += include/config/auto.conf 729 730include/config/auto.conf: 731 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 732 echo >&2; \ 733 echo >&2 " ERROR: Kernel configuration is invalid."; \ 734 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 735 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 736 echo >&2 ; \ 737 /bin/false) 738 739endif # may-sync-config 740endif # need-config 741 742KBUILD_CFLAGS += -fno-delete-null-pointer-checks 743KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 744KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 745KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 746KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 747 748ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 749KBUILD_CFLAGS += -O2 750else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 751KBUILD_CFLAGS += -O3 752else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 753KBUILD_CFLAGS += -Os 754endif 755 756# Tell gcc to never replace conditional load with a non-conditional one 757ifdef CONFIG_CC_IS_GCC 758# gcc-10 renamed --param=allow-store-data-races=0 to 759# -fno-allow-store-data-races. 760KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 761KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 762endif 763 764ifdef CONFIG_READABLE_ASM 765# Disable optimizations that make assembler listings hard to read. 766# reorder blocks reorders the control in the function 767# ipa clone creates specialized cloned functions 768# partial inlining inlines only parts of functions 769KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 770endif 771 772ifneq ($(CONFIG_FRAME_WARN),0) 773KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 774endif 775 776stackp-flags-y := -fno-stack-protector 777stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 778stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 779 780KBUILD_CFLAGS += $(stackp-flags-y) 781 782KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 783KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 784 785ifdef CONFIG_CC_IS_CLANG 786KBUILD_CPPFLAGS += -Qunused-arguments 787# The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 788KBUILD_CFLAGS += -Wno-gnu 789# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 790# source of a reference will be _MergedGlobals and not on of the whitelisted names. 791# See modpost pattern 2 792KBUILD_CFLAGS += -mno-global-merge 793else 794 795# gcc inanely warns about local variables called 'main' 796KBUILD_CFLAGS += -Wno-main 797endif 798 799# These warnings generated too much noise in a regular build. 800# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 801KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 802KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 803 804ifdef CONFIG_FRAME_POINTER 805KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 806else 807# Some targets (ARM with Thumb2, for example), can't be built with frame 808# pointers. For those, we don't have FUNCTION_TRACER automatically 809# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 810# incompatible with -fomit-frame-pointer with current GCC, so we don't use 811# -fomit-frame-pointer with FUNCTION_TRACER. 812ifndef CONFIG_FUNCTION_TRACER 813KBUILD_CFLAGS += -fomit-frame-pointer 814endif 815endif 816 817# Initialize all stack variables with a 0xAA pattern. 818ifdef CONFIG_INIT_STACK_ALL_PATTERN 819KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 820endif 821 822# Initialize all stack variables with a zero value. 823ifdef CONFIG_INIT_STACK_ALL_ZERO 824KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 825ifdef CONFIG_CC_IS_CLANG 826# https://bugs.llvm.org/show_bug.cgi?id=45497 827KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 828endif 829endif 830 831# While VLAs have been removed, GCC produces unreachable stack probes 832# for the randomize_kstack_offset feature. Disable it for all compilers. 833KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 834 835# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 836ifdef CONFIG_ZERO_CALL_USED_REGS 837KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 838endif 839 840ifdef CONFIG_FUNCTION_TRACER 841ifdef CONFIG_FTRACE_MCOUNT_USE_CC 842 CC_FLAGS_FTRACE += -mrecord-mcount 843 ifdef CONFIG_HAVE_NOP_MCOUNT 844 ifeq ($(call cc-option-yn, -mnop-mcount),y) 845 CC_FLAGS_FTRACE += -mnop-mcount 846 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 847 endif 848 endif 849endif 850ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 851 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 852endif 853ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 854 ifdef CONFIG_HAVE_C_RECORDMCOUNT 855 BUILD_C_RECORDMCOUNT := y 856 export BUILD_C_RECORDMCOUNT 857 endif 858endif 859ifdef CONFIG_HAVE_FENTRY 860 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 861 ifeq ($(call cc-option-yn, -mfentry),y) 862 CC_FLAGS_FTRACE += -mfentry 863 CC_FLAGS_USING += -DCC_USING_FENTRY 864 endif 865endif 866export CC_FLAGS_FTRACE 867KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 868KBUILD_AFLAGS += $(CC_FLAGS_USING) 869endif 870 871# We trigger additional mismatches with less inlining 872ifdef CONFIG_DEBUG_SECTION_MISMATCH 873KBUILD_CFLAGS += -fno-inline-functions-called-once 874endif 875 876ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 877KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 878LDFLAGS_vmlinux += --gc-sections 879endif 880 881ifdef CONFIG_SHADOW_CALL_STACK 882CC_FLAGS_SCS := -fsanitize=shadow-call-stack 883KBUILD_CFLAGS += $(CC_FLAGS_SCS) 884export CC_FLAGS_SCS 885endif 886 887ifdef CONFIG_LTO_CLANG 888ifdef CONFIG_LTO_CLANG_THIN 889CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 890KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 891else 892CC_FLAGS_LTO := -flto 893endif 894CC_FLAGS_LTO += -fvisibility=hidden 895 896# Limit inlining across translation units to reduce binary size 897KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 898 899# Check for frame size exceeding threshold during prolog/epilog insertion 900# when using lld < 13.0.0. 901ifneq ($(CONFIG_FRAME_WARN),0) 902ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 903KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 904endif 905endif 906endif 907 908ifdef CONFIG_LTO 909KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 910KBUILD_AFLAGS += -fno-lto 911export CC_FLAGS_LTO 912endif 913 914ifdef CONFIG_CFI_CLANG 915CC_FLAGS_CFI := -fsanitize=cfi \ 916 -fsanitize-cfi-cross-dso \ 917 -fno-sanitize-cfi-canonical-jump-tables \ 918 -fno-sanitize-trap=cfi \ 919 -fno-sanitize-blacklist 920 921ifdef CONFIG_CFI_PERMISSIVE 922CC_FLAGS_CFI += -fsanitize-recover=cfi 923endif 924 925# If LTO flags are filtered out, we must also filter out CFI. 926CC_FLAGS_LTO += $(CC_FLAGS_CFI) 927KBUILD_CFLAGS += $(CC_FLAGS_CFI) 928export CC_FLAGS_CFI 929endif 930 931ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 932KBUILD_CFLAGS += -falign-functions=64 933endif 934 935# arch Makefile may override CC so keep this after arch Makefile is included 936NOSTDINC_FLAGS += -nostdinc 937 938# warn about C99 declaration after statement 939KBUILD_CFLAGS += -Wdeclaration-after-statement 940 941# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 942KBUILD_CFLAGS += -Wvla 943 944# disable pointer signed / unsigned warnings in gcc 4.0 945KBUILD_CFLAGS += -Wno-pointer-sign 946 947# In order to make sure new function cast mismatches are not introduced 948# in the kernel (to avoid tripping CFI checking), the kernel should be 949# globally built with -Wcast-function-type. 950KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 951 952# disable stringop warnings in gcc 8+ 953KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 954 955# We'll want to enable this eventually, but it's not going away for 5.7 at least 956KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 957KBUILD_CFLAGS += -Wno-array-bounds 958KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 959 960# Another good warning that we'll want to enable eventually 961KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 962 963# Enabled with W=2, disabled by default as noisy 964ifdef CONFIG_CC_IS_GCC 965KBUILD_CFLAGS += -Wno-maybe-uninitialized 966endif 967 968ifdef CONFIG_CC_IS_GCC 969# The allocators already balk at large sizes, so silence the compiler 970# warnings for bounds checks involving those possible values. While 971# -Wno-alloc-size-larger-than would normally be used here, earlier versions 972# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 973# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 974# doesn't work (as it is documented to), silently resolving to "0" prior to 975# version 9.1 (and producing an error more recently). Numeric values larger 976# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 977# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 978# choice, we must perform a versioned check to disable this warning. 979# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 980KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 981endif 982 983# disable invalid "can't wrap" optimizations for signed / pointers 984KBUILD_CFLAGS += -fno-strict-overflow 985 986# Make sure -fstack-check isn't enabled (like gentoo apparently did) 987KBUILD_CFLAGS += -fno-stack-check 988 989# conserve stack if available 990ifdef CONFIG_CC_IS_GCC 991KBUILD_CFLAGS += -fconserve-stack 992endif 993 994# Prohibit date/time macros, which would make the build non-deterministic 995KBUILD_CFLAGS += -Werror=date-time 996 997# enforce correct pointer usage 998KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 999 1000# Require designated initializers for all marked structures 1001KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1002 1003# change __FILE__ to the relative path from the srctree 1004KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1005 1006# include additional Makefiles when needed 1007include-y := scripts/Makefile.extrawarn 1008include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1009include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1010include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1011include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1012include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1013include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1014 1015include $(addprefix $(srctree)/, $(include-y)) 1016 1017# scripts/Makefile.gcc-plugins is intentionally included last. 1018# Do not add $(call cc-option,...) below this line. When you build the kernel 1019# from the clean source tree, the GCC plugins do not exist at this point. 1020 1021# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1022KBUILD_CPPFLAGS += $(KCPPFLAGS) 1023KBUILD_AFLAGS += $(KAFLAGS) 1024KBUILD_CFLAGS += $(KCFLAGS) 1025 1026KBUILD_LDFLAGS_MODULE += --build-id=sha1 1027LDFLAGS_vmlinux += --build-id=sha1 1028 1029ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1030LDFLAGS_vmlinux += $(call ld-option, -X,) 1031endif 1032 1033ifeq ($(CONFIG_RELR),y) 1034LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1035endif 1036 1037# We never want expected sections to be placed heuristically by the 1038# linker. All sections should be explicitly named in the linker script. 1039ifdef CONFIG_LD_ORPHAN_WARN 1040LDFLAGS_vmlinux += --orphan-handling=warn 1041endif 1042 1043# Align the bit size of userspace programs with the kernel 1044KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1045KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1046 1047# make the checker run with the right architecture 1048CHECKFLAGS += --arch=$(ARCH) 1049 1050# insure the checker run with the right endianness 1051CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1052 1053# the checker needs the correct machine size 1054CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1055 1056# Default kernel image to build when no specific target is given. 1057# KBUILD_IMAGE may be overruled on the command line or 1058# set in the environment 1059# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1060# this default value 1061export KBUILD_IMAGE ?= vmlinux 1062 1063# 1064# INSTALL_PATH specifies where to place the updated kernel and system map 1065# images. Default is /boot, but you can set it to other values 1066export INSTALL_PATH ?= /boot 1067 1068# 1069# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1070# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1071# an argument if needed. Otherwise it defaults to the kernel install path 1072# 1073export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1074 1075# 1076# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1077# relocations required by build roots. This is not defined in the 1078# makefile but the argument can be passed to make if needed. 1079# 1080 1081MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1082export MODLIB 1083 1084PHONY += prepare0 1085 1086export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1087export MODORDER := $(extmod_prefix)modules.order 1088export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1089 1090ifeq ($(KBUILD_EXTMOD),) 1091core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1092core-$(CONFIG_BLOCK) += block/ 1093 1094vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1095 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1096 $(libs-y) $(libs-m))) 1097 1098vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1099 $(patsubst %/,%,$(filter %/, $(core-) \ 1100 $(drivers-) $(libs-)))) 1101 1102subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1103 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1104 $(drivers-y) $(drivers-m))) 1105 1106build-dirs := $(vmlinux-dirs) 1107clean-dirs := $(vmlinux-alldirs) 1108 1109# Externally visible symbols (used by link-vmlinux.sh) 1110KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1111KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1112ifdef CONFIG_MODULES 1113KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1114KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1115else 1116KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1117endif 1118KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1119 1120export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1121export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1122# used by scripts/Makefile.package 1123export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1124 1125vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1126 1127# Recurse until adjust_autoksyms.sh is satisfied 1128PHONY += autoksyms_recursive 1129ifdef CONFIG_TRIM_UNUSED_KSYMS 1130# For the kernel to actually contain only the needed exported symbols, 1131# we have to build modules as well to determine what those symbols are. 1132# (this can be evaluated only once include/config/auto.conf has been included) 1133KBUILD_MODULES := 1 1134 1135autoksyms_recursive: descend modules.order 1136 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1137 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1138endif 1139 1140autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1141 1142quiet_cmd_autoksyms_h = GEN $@ 1143 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1144 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1145 1146$(autoksyms_h): 1147 $(call cmd,autoksyms_h) 1148 1149ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1150 1151# Final link of vmlinux with optional arch pass after final link 1152cmd_link-vmlinux = \ 1153 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1154 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1155 1156vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1157 +$(call if_changed_dep,link-vmlinux) 1158 1159targets := vmlinux 1160 1161# The actual objects are generated when descending, 1162# make sure no implicit rule kicks in 1163$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1164 1165filechk_kernel.release = \ 1166 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1167 1168# Store (new) KERNELRELEASE string in include/config/kernel.release 1169include/config/kernel.release: FORCE 1170 $(call filechk,kernel.release) 1171 1172# Additional helpers built in scripts/ 1173# Carefully list dependencies so we do not try to build scripts twice 1174# in parallel 1175PHONY += scripts 1176scripts: scripts_basic scripts_dtc 1177 $(Q)$(MAKE) $(build)=$(@) 1178 1179# Things we need to do before we recursively start building the kernel 1180# or the modules are listed in "prepare". 1181# A multi level approach is used. prepareN is processed before prepareN-1. 1182# archprepare is used in arch Makefiles and when processed asm symlink, 1183# version.h and scripts_basic is processed / created. 1184 1185PHONY += prepare archprepare 1186 1187archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1188 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1189 include/generated/autoconf.h remove-stale-files 1190 1191prepare0: archprepare 1192 $(Q)$(MAKE) $(build)=scripts/mod 1193 $(Q)$(MAKE) $(build)=. 1194 1195# All the preparing.. 1196prepare: prepare0 1197 1198PHONY += remove-stale-files 1199remove-stale-files: 1200 $(Q)$(srctree)/scripts/remove-stale-files 1201 1202# Support for using generic headers in asm-generic 1203asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1204 1205PHONY += asm-generic uapi-asm-generic 1206asm-generic: uapi-asm-generic 1207 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1208 generic=include/asm-generic 1209uapi-asm-generic: 1210 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1211 generic=include/uapi/asm-generic 1212 1213# Generate some files 1214# --------------------------------------------------------------------------- 1215 1216# KERNELRELEASE can change from a few different places, meaning version.h 1217# needs to be updated, so this check is forced on all builds 1218 1219uts_len := 64 1220define filechk_utsrelease.h 1221 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1222 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1223 exit 1; \ 1224 fi; \ 1225 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1226endef 1227 1228define filechk_version.h 1229 if [ $(SUBLEVEL) -gt 255 ]; then \ 1230 echo \#define LINUX_VERSION_CODE $(shell \ 1231 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1232 else \ 1233 echo \#define LINUX_VERSION_CODE $(shell \ 1234 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1235 fi; \ 1236 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1237 ((c) > 255 ? 255 : (c)))'; \ 1238 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1239 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1240 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1241endef 1242 1243$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1244$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1245$(version_h): FORCE 1246 $(call filechk,version.h) 1247 1248include/generated/utsrelease.h: include/config/kernel.release FORCE 1249 $(call filechk,utsrelease.h) 1250 1251PHONY += headerdep 1252headerdep: 1253 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1254 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1255 1256# --------------------------------------------------------------------------- 1257# Kernel headers 1258 1259#Default location for installed headers 1260export INSTALL_HDR_PATH = $(objtree)/usr 1261 1262quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1263 cmd_headers_install = \ 1264 mkdir -p $(INSTALL_HDR_PATH); \ 1265 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1266 usr/include $(INSTALL_HDR_PATH) 1267 1268PHONY += headers_install 1269headers_install: headers 1270 $(call cmd,headers_install) 1271 1272PHONY += archheaders archscripts 1273 1274hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1275 1276PHONY += headers 1277headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1278 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1279 $(error Headers not exportable for the $(SRCARCH) architecture)) 1280 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1281 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1282 1283ifdef CONFIG_HEADERS_INSTALL 1284prepare: headers 1285endif 1286 1287PHONY += scripts_unifdef 1288scripts_unifdef: scripts_basic 1289 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1290 1291# --------------------------------------------------------------------------- 1292# Install 1293 1294# Many distributions have the custom install script, /sbin/installkernel. 1295# If DKMS is installed, 'make install' will eventually recuses back 1296# to the this Makefile to build and install external modules. 1297# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1298 1299install: sub_make_done := 1300 1301# --------------------------------------------------------------------------- 1302# Tools 1303 1304ifdef CONFIG_STACK_VALIDATION 1305prepare: tools/objtool 1306endif 1307 1308ifdef CONFIG_BPF 1309ifdef CONFIG_DEBUG_INFO_BTF 1310prepare: tools/bpf/resolve_btfids 1311endif 1312endif 1313 1314PHONY += resolve_btfids_clean 1315 1316resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1317 1318# tools/bpf/resolve_btfids directory might not exist 1319# in output directory, skip its clean in that case 1320resolve_btfids_clean: 1321ifneq ($(wildcard $(resolve_btfids_O)),) 1322 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1323endif 1324 1325# Clear a bunch of variables before executing the submake 1326ifeq ($(quiet),silent_) 1327tools_silent=s 1328endif 1329 1330tools/: FORCE 1331 $(Q)mkdir -p $(objtree)/tools 1332 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1333 1334tools/%: FORCE 1335 $(Q)mkdir -p $(objtree)/tools 1336 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1337 1338# --------------------------------------------------------------------------- 1339# Kernel selftest 1340 1341PHONY += kselftest 1342kselftest: 1343 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1344 1345kselftest-%: FORCE 1346 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1347 1348PHONY += kselftest-merge 1349kselftest-merge: 1350 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1351 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1352 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1353 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1354 1355# --------------------------------------------------------------------------- 1356# Devicetree files 1357 1358ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1359dtstree := arch/$(SRCARCH)/boot/dts 1360endif 1361 1362ifneq ($(dtstree),) 1363 1364%.dtb: include/config/kernel.release scripts_dtc 1365 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1366 1367%.dtbo: include/config/kernel.release scripts_dtc 1368 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1369 1370PHONY += dtbs dtbs_install dtbs_check 1371dtbs: include/config/kernel.release scripts_dtc 1372 $(Q)$(MAKE) $(build)=$(dtstree) 1373 1374ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1375export CHECK_DTBS=y 1376dtbs: dt_binding_check 1377endif 1378 1379dtbs_check: dtbs 1380 1381dtbs_install: 1382 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1383 1384ifdef CONFIG_OF_EARLY_FLATTREE 1385all: dtbs 1386endif 1387 1388endif 1389 1390PHONY += scripts_dtc 1391scripts_dtc: scripts_basic 1392 $(Q)$(MAKE) $(build)=scripts/dtc 1393 1394ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1395export CHECK_DT_BINDING=y 1396endif 1397 1398PHONY += dt_binding_check 1399dt_binding_check: scripts_dtc 1400 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1401 1402# --------------------------------------------------------------------------- 1403# Modules 1404 1405ifdef CONFIG_MODULES 1406 1407# By default, build modules as well 1408 1409all: modules 1410 1411# When we're building modules with modversions, we need to consider 1412# the built-in objects during the descend as well, in order to 1413# make sure the checksums are up to date before we record them. 1414ifdef CONFIG_MODVERSIONS 1415 KBUILD_BUILTIN := 1 1416endif 1417 1418# Build modules 1419# 1420# A module can be listed more than once in obj-m resulting in 1421# duplicate lines in modules.order files. Those are removed 1422# using awk while concatenating to the final file. 1423 1424PHONY += modules 1425modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1426 1427cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1428 1429modules.order: $(subdir-modorder) FORCE 1430 $(call if_changed,modules_order) 1431 1432targets += modules.order 1433 1434# Target to prepare building external modules 1435PHONY += modules_prepare 1436modules_prepare: prepare 1437 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1438 1439export modules_sign_only := 1440 1441ifeq ($(CONFIG_MODULE_SIG),y) 1442PHONY += modules_sign 1443modules_sign: modules_install 1444 @: 1445 1446# modules_sign is a subset of modules_install. 1447# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1448ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1449modules_sign_only := y 1450endif 1451endif 1452 1453modinst_pre := 1454ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1455modinst_pre := __modinst_pre 1456endif 1457 1458modules_install: $(modinst_pre) 1459PHONY += __modinst_pre 1460__modinst_pre: 1461 @rm -rf $(MODLIB)/kernel 1462 @rm -f $(MODLIB)/source 1463 @mkdir -p $(MODLIB)/kernel 1464 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1465 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1466 rm -f $(MODLIB)/build ; \ 1467 ln -s $(CURDIR) $(MODLIB)/build ; \ 1468 fi 1469 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1470 @cp -f modules.builtin $(MODLIB)/ 1471 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1472 1473endif # CONFIG_MODULES 1474 1475### 1476# Cleaning is done on three levels. 1477# make clean Delete most generated files 1478# Leave enough to build external modules 1479# make mrproper Delete the current configuration, and all generated files 1480# make distclean Remove editor backup files, patch leftover files and the like 1481 1482# Directories & files removed with 'make clean' 1483CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1484 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1485 compile_commands.json .thinlto-cache 1486 1487# Directories & files removed with 'make mrproper' 1488MRPROPER_FILES += include/config include/generated \ 1489 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1490 debian snap tar-install \ 1491 .config .config.old .version \ 1492 Module.symvers \ 1493 certs/signing_key.pem \ 1494 certs/x509.genkey \ 1495 vmlinux-gdb.py \ 1496 *.spec 1497 1498# clean - Delete most, but leave enough to build external modules 1499# 1500clean: rm-files := $(CLEAN_FILES) 1501 1502PHONY += archclean vmlinuxclean 1503 1504vmlinuxclean: 1505 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1506 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1507 1508clean: archclean vmlinuxclean resolve_btfids_clean 1509 1510# mrproper - Delete all generated files, including .config 1511# 1512mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1513mrproper-dirs := $(addprefix _mrproper_,scripts) 1514 1515PHONY += $(mrproper-dirs) mrproper 1516$(mrproper-dirs): 1517 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1518 1519mrproper: clean $(mrproper-dirs) 1520 $(call cmd,rmfiles) 1521 1522# distclean 1523# 1524PHONY += distclean 1525 1526distclean: mrproper 1527 @find . $(RCS_FIND_IGNORE) \ 1528 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1529 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1530 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1531 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1532 -type f -print | xargs rm -f 1533 1534 1535# Packaging of the kernel to various formats 1536# --------------------------------------------------------------------------- 1537 1538%src-pkg: FORCE 1539 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1540%pkg: include/config/kernel.release FORCE 1541 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1542 1543# Brief documentation of the typical targets used 1544# --------------------------------------------------------------------------- 1545 1546boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1547boards := $(sort $(notdir $(boards))) 1548board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1549board-dirs := $(sort $(notdir $(board-dirs:/=))) 1550 1551PHONY += help 1552help: 1553 @echo 'Cleaning targets:' 1554 @echo ' clean - Remove most generated files but keep the config and' 1555 @echo ' enough build support to build external modules' 1556 @echo ' mrproper - Remove all generated files + config + various backup files' 1557 @echo ' distclean - mrproper + remove editor backup and patch files' 1558 @echo '' 1559 @echo 'Configuration targets:' 1560 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1561 @echo '' 1562 @echo 'Other generic targets:' 1563 @echo ' all - Build all targets marked with [*]' 1564 @echo '* vmlinux - Build the bare kernel' 1565 @echo '* modules - Build all modules' 1566 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1567 @echo ' dir/ - Build all files in dir and below' 1568 @echo ' dir/file.[ois] - Build specified target only' 1569 @echo ' dir/file.ll - Build the LLVM assembly file' 1570 @echo ' (requires compiler support for LLVM assembly generation)' 1571 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1572 @echo ' (requires a recent binutils and recent build (System.map))' 1573 @echo ' dir/file.ko - Build module including final link' 1574 @echo ' modules_prepare - Set up for building external modules' 1575 @echo ' tags/TAGS - Generate tags file for editors' 1576 @echo ' cscope - Generate cscope index' 1577 @echo ' gtags - Generate GNU GLOBAL index' 1578 @echo ' kernelrelease - Output the release version string (use with make -s)' 1579 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1580 @echo ' image_name - Output the image name (use with make -s)' 1581 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1582 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1583 echo '' 1584 @echo 'Static analysers:' 1585 @echo ' checkstack - Generate a list of stack hogs' 1586 @echo ' versioncheck - Sanity check on version.h usage' 1587 @echo ' includecheck - Check for duplicate included header files' 1588 @echo ' export_report - List the usages of all exported symbols' 1589 @echo ' headerdep - Detect inclusion cycles in headers' 1590 @echo ' coccicheck - Check with Coccinelle' 1591 @echo ' clang-analyzer - Check with clang static analyzer' 1592 @echo ' clang-tidy - Check with clang-tidy' 1593 @echo '' 1594 @echo 'Tools:' 1595 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1596 @echo '' 1597 @echo 'Kernel selftest:' 1598 @echo ' kselftest - Build and run kernel selftest' 1599 @echo ' Build, install, and boot kernel before' 1600 @echo ' running kselftest on it' 1601 @echo ' Run as root for full coverage' 1602 @echo ' kselftest-all - Build kernel selftest' 1603 @echo ' kselftest-install - Build and install kernel selftest' 1604 @echo ' kselftest-clean - Remove all generated kselftest files' 1605 @echo ' kselftest-merge - Merge all the config dependencies of' 1606 @echo ' kselftest to existing .config.' 1607 @echo '' 1608 @$(if $(dtstree), \ 1609 echo 'Devicetree:'; \ 1610 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1611 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1612 echo ' dt_binding_check - Validate device tree binding documents'; \ 1613 echo ' dtbs_check - Validate device tree source files';\ 1614 echo '') 1615 1616 @echo 'Userspace tools targets:' 1617 @echo ' use "make tools/help"' 1618 @echo ' or "cd tools; make help"' 1619 @echo '' 1620 @echo 'Kernel packaging:' 1621 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1622 @echo '' 1623 @echo 'Documentation targets:' 1624 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1625 @echo '' 1626 @echo 'Architecture specific targets ($(SRCARCH)):' 1627 @$(or $(archhelp),\ 1628 echo ' No architecture specific help defined for $(SRCARCH)') 1629 @echo '' 1630 @$(if $(boards), \ 1631 $(foreach b, $(boards), \ 1632 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1633 echo '') 1634 @$(if $(board-dirs), \ 1635 $(foreach b, $(board-dirs), \ 1636 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1637 printf " %-16s - Show all of the above\\n" help-boards; \ 1638 echo '') 1639 1640 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1641 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1642 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1643 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1644 @echo ' (sparse by default)' 1645 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1646 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1647 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1648 @echo ' 1: warnings which may be relevant and do not occur too often' 1649 @echo ' 2: warnings which occur quite often but may still be relevant' 1650 @echo ' 3: more obscure warnings, can most likely be ignored' 1651 @echo ' Multiple levels can be combined with W=12 or W=123' 1652 @echo '' 1653 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1654 @echo 'For further info see the ./README file' 1655 1656 1657help-board-dirs := $(addprefix help-,$(board-dirs)) 1658 1659help-boards: $(help-board-dirs) 1660 1661boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1662 1663$(help-board-dirs): help-%: 1664 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1665 @$(if $(boards-per-dir), \ 1666 $(foreach b, $(boards-per-dir), \ 1667 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1668 echo '') 1669 1670 1671# Documentation targets 1672# --------------------------------------------------------------------------- 1673DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1674 linkcheckdocs dochelp refcheckdocs 1675PHONY += $(DOC_TARGETS) 1676$(DOC_TARGETS): 1677 $(Q)$(MAKE) $(build)=Documentation $@ 1678 1679# Misc 1680# --------------------------------------------------------------------------- 1681 1682PHONY += scripts_gdb 1683scripts_gdb: prepare0 1684 $(Q)$(MAKE) $(build)=scripts/gdb 1685 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1686 1687ifdef CONFIG_GDB_SCRIPTS 1688all: scripts_gdb 1689endif 1690 1691else # KBUILD_EXTMOD 1692 1693### 1694# External module support. 1695# When building external modules the kernel used as basis is considered 1696# read-only, and no consistency checks are made and the make 1697# system is not used on the basis kernel. If updates are required 1698# in the basis kernel ordinary make commands (without M=...) must be used. 1699 1700# We are always building only modules. 1701KBUILD_BUILTIN := 1702KBUILD_MODULES := 1 1703 1704build-dirs := $(KBUILD_EXTMOD) 1705$(MODORDER): descend 1706 @: 1707 1708compile_commands.json: $(extmod_prefix)compile_commands.json 1709PHONY += compile_commands.json 1710 1711clean-dirs := $(KBUILD_EXTMOD) 1712clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1713 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1714 1715PHONY += prepare 1716# now expand this into a simple variable to reduce the cost of shell evaluations 1717prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1718prepare: 1719 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1720 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1721 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1722 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1723 fi 1724 1725PHONY += help 1726help: 1727 @echo ' Building external modules.' 1728 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1729 @echo '' 1730 @echo ' modules - default target, build the module(s)' 1731 @echo ' modules_install - install the module' 1732 @echo ' clean - remove generated files in module directory only' 1733 @echo '' 1734 1735# no-op for external module builds 1736PHONY += modules_prepare 1737 1738endif # KBUILD_EXTMOD 1739 1740# --------------------------------------------------------------------------- 1741# Modules 1742 1743PHONY += modules modules_install 1744 1745ifdef CONFIG_MODULES 1746 1747modules: modules_check 1748 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1749 1750PHONY += modules_check 1751modules_check: $(MODORDER) 1752 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1753 1754quiet_cmd_depmod = DEPMOD $(MODLIB) 1755 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1756 $(KERNELRELEASE) 1757 1758modules_install: 1759 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1760 $(call cmd,depmod) 1761 1762else # CONFIG_MODULES 1763 1764# Modules not configured 1765# --------------------------------------------------------------------------- 1766 1767modules modules_install: 1768 @echo >&2 '***' 1769 @echo >&2 '*** The present kernel configuration has modules disabled.' 1770 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1771 @echo >&2 '*** to enable CONFIG_MODULES.' 1772 @echo >&2 '***' 1773 @exit 1 1774 1775endif # CONFIG_MODULES 1776 1777# Single targets 1778# --------------------------------------------------------------------------- 1779# To build individual files in subdirectories, you can do like this: 1780# 1781# make foo/bar/baz.s 1782# 1783# The supported suffixes for single-target are listed in 'single-targets' 1784# 1785# To build only under specific subdirectories, you can do like this: 1786# 1787# make foo/bar/baz/ 1788 1789ifdef single-build 1790 1791# .ko is special because modpost is needed 1792single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1793single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1794 1795$(single-ko): single_modpost 1796 @: 1797$(single-no-ko): descend 1798 @: 1799 1800ifeq ($(KBUILD_EXTMOD),) 1801# For the single build of in-tree modules, use a temporary file to avoid 1802# the situation of modules_install installing an invalid modules.order. 1803MODORDER := .modules.tmp 1804endif 1805 1806PHONY += single_modpost 1807single_modpost: $(single-no-ko) modules_prepare 1808 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1809 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1810 1811KBUILD_MODULES := 1 1812 1813export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1814 1815# trim unrelated directories 1816build-dirs := $(foreach d, $(build-dirs), \ 1817 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1818 1819endif 1820 1821ifndef CONFIG_MODULES 1822KBUILD_MODULES := 1823endif 1824 1825# Handle descending into subdirectories listed in $(build-dirs) 1826# Preset locale variables to speed up the build process. Limit locale 1827# tweaks to this spot to avoid wrong language settings when running 1828# make menuconfig etc. 1829# Error messages still appears in the original language 1830PHONY += descend $(build-dirs) 1831descend: $(build-dirs) 1832$(build-dirs): prepare 1833 $(Q)$(MAKE) $(build)=$@ \ 1834 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1835 need-builtin=1 need-modorder=1 1836 1837clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1838PHONY += $(clean-dirs) clean 1839$(clean-dirs): 1840 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1841 1842clean: $(clean-dirs) 1843 $(call cmd,rmfiles) 1844 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1845 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1846 -o -name '*.ko.*' \ 1847 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1848 -o -name '*.dwo' -o -name '*.lst' \ 1849 -o -name '*.su' -o -name '*.mod' \ 1850 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1851 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1852 -o -name '*.asn1.[ch]' \ 1853 -o -name '*.symtypes' -o -name 'modules.order' \ 1854 -o -name '.tmp_*.o.*' \ 1855 -o -name '*.c.[012]*.*' \ 1856 -o -name '*.ll' \ 1857 -o -name '*.gcno' \ 1858 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1859 1860# Generate tags for editors 1861# --------------------------------------------------------------------------- 1862quiet_cmd_tags = GEN $@ 1863 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1864 1865tags TAGS cscope gtags: FORCE 1866 $(call cmd,tags) 1867 1868# Script to generate missing namespace dependencies 1869# --------------------------------------------------------------------------- 1870 1871PHONY += nsdeps 1872nsdeps: export KBUILD_NSDEPS=1 1873nsdeps: modules 1874 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1875 1876# Clang Tooling 1877# --------------------------------------------------------------------------- 1878 1879quiet_cmd_gen_compile_commands = GEN $@ 1880 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1881 1882$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1883 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1884 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1885 $(call if_changed,gen_compile_commands) 1886 1887targets += $(extmod_prefix)compile_commands.json 1888 1889PHONY += clang-tidy clang-analyzer 1890 1891ifdef CONFIG_CC_IS_CLANG 1892quiet_cmd_clang_tools = CHECK $< 1893 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1894 1895clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1896 $(call cmd,clang_tools) 1897else 1898clang-tidy clang-analyzer: 1899 @echo "$@ requires CC=clang" >&2 1900 @false 1901endif 1902 1903# Scripts to check various things for consistency 1904# --------------------------------------------------------------------------- 1905 1906PHONY += includecheck versioncheck coccicheck export_report 1907 1908includecheck: 1909 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1910 -name '*.[hcS]' -type f -print | sort \ 1911 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1912 1913versioncheck: 1914 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1915 -name '*.[hcS]' -type f -print | sort \ 1916 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1917 1918coccicheck: 1919 $(Q)$(BASH) $(srctree)/scripts/$@ 1920 1921export_report: 1922 $(PERL) $(srctree)/scripts/export_report.pl 1923 1924PHONY += checkstack kernelrelease kernelversion image_name 1925 1926# UML needs a little special treatment here. It wants to use the host 1927# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1928# else wants $(ARCH), including people doing cross-builds, which means 1929# that $(SUBARCH) doesn't work here. 1930ifeq ($(ARCH), um) 1931CHECKSTACK_ARCH := $(SUBARCH) 1932else 1933CHECKSTACK_ARCH := $(ARCH) 1934endif 1935checkstack: 1936 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1937 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1938 1939kernelrelease: 1940 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1941 1942kernelversion: 1943 @echo $(KERNELVERSION) 1944 1945image_name: 1946 @echo $(KBUILD_IMAGE) 1947 1948quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1949 cmd_rmfiles = rm -rf $(rm-files) 1950 1951# read saved command lines for existing targets 1952existing-targets := $(wildcard $(sort $(targets))) 1953 1954-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1955 1956endif # config-build 1957endif # mixed-build 1958endif # need-sub-make 1959 1960PHONY += FORCE 1961FORCE: 1962 1963# Declare the contents of the PHONY variable as phony. We keep that 1964# information in a variable so we can use it in if_changed and friends. 1965.PHONY: $(PHONY) 1966