1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 6NAME = Frozen Wasteland 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 $(error building multiple external modules is not supported)) 131 132export KBUILD_EXTMOD 133 134# Kbuild will save output files in the current working directory. 135# This does not need to match to the root of the kernel source tree. 136# 137# For example, you can do this: 138# 139# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 140# 141# If you want to save output files in a different location, there are 142# two syntaxes to specify it. 143# 144# 1) O= 145# Use "make O=dir/to/store/output/files/" 146# 147# 2) Set KBUILD_OUTPUT 148# Set the environment variable KBUILD_OUTPUT to point to the output directory. 149# export KBUILD_OUTPUT=dir/to/store/output/files/; make 150# 151# The O= assignment takes precedence over the KBUILD_OUTPUT environment 152# variable. 153 154# Do we want to change the working directory? 155ifeq ("$(origin O)", "command line") 156 KBUILD_OUTPUT := $(O) 157endif 158 159ifneq ($(KBUILD_OUTPUT),) 160# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 161# expand a shell special character '~'. We use a somewhat tedious way here. 162abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 163$(if $(abs_objtree),, \ 164 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 165 166# $(realpath ...) resolves symlinks 167abs_objtree := $(realpath $(abs_objtree)) 168else 169abs_objtree := $(CURDIR) 170endif # ifneq ($(KBUILD_OUTPUT),) 171 172ifeq ($(abs_objtree),$(CURDIR)) 173# Suppress "Entering directory ..." unless we are changing the work directory. 174MAKEFLAGS += --no-print-directory 175else 176need-sub-make := 1 177endif 178 179this-makefile := $(lastword $(MAKEFILE_LIST)) 180abs_srctree := $(realpath $(dir $(this-makefile))) 181 182ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 183$(error source directory cannot contain spaces or colons) 184endif 185 186ifneq ($(abs_srctree),$(abs_objtree)) 187# Look for make include files relative to root of kernel src 188# 189# This does not become effective immediately because MAKEFLAGS is re-parsed 190# once after the Makefile is read. We need to invoke sub-make. 191MAKEFLAGS += --include-dir=$(abs_srctree) 192need-sub-make := 1 193endif 194 195ifneq ($(filter 3.%,$(MAKE_VERSION)),) 196# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 197# We need to invoke sub-make to avoid implicit rules in the top Makefile. 198need-sub-make := 1 199# Cancel implicit rules for this Makefile. 200$(this-makefile): ; 201endif 202 203export abs_srctree abs_objtree 204export sub_make_done := 1 205 206ifeq ($(need-sub-make),1) 207 208PHONY += $(MAKECMDGOALS) __sub-make 209 210$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 211 @: 212 213# Invoke a second make in the output directory, passing relevant variables 214__sub-make: 215 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 216 217endif # need-sub-make 218endif # sub_make_done 219 220# We process the rest of the Makefile if this is the final invocation of make 221ifeq ($(need-sub-make),) 222 223# Do not print "Entering directory ...", 224# but we want to display it when entering to the output directory 225# so that IDEs/editors are able to understand relative filenames. 226MAKEFLAGS += --no-print-directory 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260 261clean-targets := %clean mrproper cleandocs 262no-dot-config-targets := $(clean-targets) \ 263 cscope gtags TAGS tags help% %docs check% coccicheck \ 264 $(version_h) headers headers_% archheaders archscripts \ 265 %asm-generic kernelversion %src-pkg dt_binding_check \ 266 outputmakefile 267no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 268 image_name 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# SHELL used by kbuild 400CONFIG_SHELL := sh 401 402HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 403HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 404HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 405 406ifneq ($(LLVM),) 407HOSTCC = clang 408HOSTCXX = clang++ 409else 410HOSTCC = gcc 411HOSTCXX = g++ 412endif 413 414export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 415 -O2 -fomit-frame-pointer -std=gnu89 416export KBUILD_USERLDFLAGS := 417 418KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 419KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 420KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 421KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 422 423# Make variables (CC, etc...) 424CPP = $(CC) -E 425ifneq ($(LLVM),) 426CC = clang 427LD = ld.lld 428AR = llvm-ar 429NM = llvm-nm 430OBJCOPY = llvm-objcopy 431OBJDUMP = llvm-objdump 432READELF = llvm-readelf 433STRIP = llvm-strip 434else 435CC = $(CROSS_COMPILE)gcc 436LD = $(CROSS_COMPILE)ld 437AR = $(CROSS_COMPILE)ar 438NM = $(CROSS_COMPILE)nm 439OBJCOPY = $(CROSS_COMPILE)objcopy 440OBJDUMP = $(CROSS_COMPILE)objdump 441READELF = $(CROSS_COMPILE)readelf 442STRIP = $(CROSS_COMPILE)strip 443endif 444PAHOLE = pahole 445RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 446LEX = flex 447YACC = bison 448AWK = awk 449INSTALLKERNEL := installkernel 450DEPMOD = depmod 451PERL = perl 452PYTHON3 = python3 453CHECK = sparse 454BASH = bash 455KGZIP = gzip 456KBZIP2 = bzip2 457KLZOP = lzop 458LZMA = lzma 459LZ4 = lz4c 460XZ = xz 461ZSTD = zstd 462 463CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 464 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 465NOSTDINC_FLAGS := 466CFLAGS_MODULE = 467AFLAGS_MODULE = 468LDFLAGS_MODULE = 469CFLAGS_KERNEL = 470AFLAGS_KERNEL = 471LDFLAGS_vmlinux = 472 473# Use USERINCLUDE when you must reference the UAPI directories only. 474USERINCLUDE := \ 475 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 476 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 477 -I$(srctree)/include/uapi \ 478 -I$(objtree)/include/generated/uapi \ 479 -include $(srctree)/include/linux/compiler-version.h \ 480 -include $(srctree)/include/linux/kconfig.h 481 482# Use LINUXINCLUDE when you must reference the include/ directory. 483# Needed to be compatible with the O= option 484LINUXINCLUDE := \ 485 -I$(srctree)/arch/$(SRCARCH)/include \ 486 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 487 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 488 -I$(objtree)/include \ 489 $(USERINCLUDE) 490 491KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 492KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 493 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 494 -Werror=implicit-function-declaration -Werror=implicit-int \ 495 -Werror=return-type -Wno-format-security \ 496 -std=gnu89 497KBUILD_CPPFLAGS := -D__KERNEL__ 498KBUILD_AFLAGS_KERNEL := 499KBUILD_CFLAGS_KERNEL := 500KBUILD_AFLAGS_MODULE := -DMODULE 501KBUILD_CFLAGS_MODULE := -DMODULE 502KBUILD_LDFLAGS_MODULE := 503KBUILD_LDFLAGS := 504CLANG_FLAGS := 505 506export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 507export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 508export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 509export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 510export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 511 512export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 513export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 514export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 515export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 516export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 517 518# Files to ignore in find ... statements 519 520export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 521 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 522 -prune -o 523export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 524 --exclude CVS --exclude .pc --exclude .hg --exclude .git 525 526# =========================================================================== 527# Rules shared between *config targets and build targets 528 529# Basic helpers built in scripts/basic/ 530PHONY += scripts_basic 531scripts_basic: 532 $(Q)$(MAKE) $(build)=scripts/basic 533 $(Q)rm -f .tmp_quiet_recordmcount 534 535PHONY += outputmakefile 536# Before starting out-of-tree build, make sure the source tree is clean. 537# outputmakefile generates a Makefile in the output directory, if using a 538# separate output directory. This allows convenient use of make in the 539# output directory. 540# At the same time when output Makefile generated, generate .gitignore to 541# ignore whole output directory 542outputmakefile: 543ifdef building_out_of_srctree 544 $(Q)if [ -f $(srctree)/.config -o \ 545 -d $(srctree)/include/config -o \ 546 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 547 echo >&2 "***"; \ 548 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 549 echo >&2 "*** in $(abs_srctree)";\ 550 echo >&2 "***"; \ 551 false; \ 552 fi 553 $(Q)ln -fsn $(srctree) source 554 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 555 $(Q)test -e .gitignore || \ 556 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 557endif 558 559# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 560# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 561# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 562# and from include/config/auto.conf.cmd to detect the compiler upgrade. 563CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1 | sed 's/\#//g') 564 565ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 566ifneq ($(CROSS_COMPILE),) 567CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 568GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 569CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 570GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 571endif 572ifneq ($(GCC_TOOLCHAIN),) 573CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 574endif 575ifneq ($(LLVM_IAS),1) 576CLANG_FLAGS += -no-integrated-as 577endif 578CLANG_FLAGS += -Werror=unknown-warning-option 579KBUILD_CFLAGS += $(CLANG_FLAGS) 580KBUILD_AFLAGS += $(CLANG_FLAGS) 581export CLANG_FLAGS 582endif 583 584ifdef config-build 585# =========================================================================== 586# *config targets only - make sure prerequisites are updated, and descend 587# in scripts/kconfig to make the *config target 588 589# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 590# KBUILD_DEFCONFIG may point out an alternative default configuration 591# used for 'make defconfig' 592include arch/$(SRCARCH)/Makefile 593export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 594 595config: outputmakefile scripts_basic FORCE 596 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 597 598%config: outputmakefile scripts_basic FORCE 599 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 600 601else #!config-build 602# =========================================================================== 603# Build targets only - this includes vmlinux, arch specific targets, clean 604# targets and others. In general all targets except *config targets. 605 606# If building an external module we do not care about the all: rule 607# but instead __all depend on modules 608PHONY += all 609ifeq ($(KBUILD_EXTMOD),) 610__all: all 611else 612__all: modules 613endif 614 615# Decide whether to build built-in, modular, or both. 616# Normally, just do built-in. 617 618KBUILD_MODULES := 619KBUILD_BUILTIN := 1 620 621# If we have only "make modules", don't compile built-in objects. 622ifeq ($(MAKECMDGOALS),modules) 623 KBUILD_BUILTIN := 624endif 625 626# If we have "make <whatever> modules", compile modules 627# in addition to whatever we do anyway. 628# Just "make" or "make all" shall build modules as well 629 630ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 631 KBUILD_MODULES := 1 632endif 633 634ifeq ($(MAKECMDGOALS),) 635 KBUILD_MODULES := 1 636endif 637 638export KBUILD_MODULES KBUILD_BUILTIN 639 640ifdef need-config 641include include/config/auto.conf 642endif 643 644ifeq ($(KBUILD_EXTMOD),) 645# Objects we will link into vmlinux / subdirs we need to visit 646core-y := init/ usr/ 647drivers-y := drivers/ sound/ 648drivers-$(CONFIG_SAMPLES) += samples/ 649drivers-$(CONFIG_NET) += net/ 650drivers-y += virt/ 651libs-y := lib/ 652endif # KBUILD_EXTMOD 653 654# The all: target is the default when no target is given on the 655# command line. 656# This allow a user to issue only 'make' to build a kernel including modules 657# Defaults to vmlinux, but the arch makefile usually adds further targets 658all: vmlinux 659 660CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 661 $(call cc-option,-fno-tree-loop-im) \ 662 $(call cc-disable-warning,maybe-uninitialized,) 663export CFLAGS_GCOV 664 665# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 666ifdef CONFIG_FUNCTION_TRACER 667 CC_FLAGS_FTRACE := -pg 668endif 669 670RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 671RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 672RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 673RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 674RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 675RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 676export RETPOLINE_CFLAGS 677export RETPOLINE_VDSO_CFLAGS 678 679include arch/$(SRCARCH)/Makefile 680 681ifdef need-config 682ifdef may-sync-config 683# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 684# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 685# because some architectures define CROSS_COMPILE there. 686include include/config/auto.conf.cmd 687 688$(KCONFIG_CONFIG): 689 @echo >&2 '***' 690 @echo >&2 '*** Configuration file "$@" not found!' 691 @echo >&2 '***' 692 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 693 @echo >&2 '*** "make menuconfig" or "make xconfig").' 694 @echo >&2 '***' 695 @/bin/false 696 697# The actual configuration files used during the build are stored in 698# include/generated/ and include/config/. Update them if .config is newer than 699# include/config/auto.conf (which mirrors .config). 700# 701# This exploits the 'multi-target pattern rule' trick. 702# The syncconfig should be executed only once to make all the targets. 703# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 704quiet_cmd_syncconfig = SYNC $@ 705 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 706 707%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 708 +$(call cmd,syncconfig) 709else # !may-sync-config 710# External modules and some install targets need include/generated/autoconf.h 711# and include/config/auto.conf but do not care if they are up-to-date. 712# Use auto.conf to trigger the test 713PHONY += include/config/auto.conf 714 715include/config/auto.conf: 716 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 717 echo >&2; \ 718 echo >&2 " ERROR: Kernel configuration is invalid."; \ 719 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 720 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 721 echo >&2 ; \ 722 /bin/false) 723 724endif # may-sync-config 725endif # need-config 726 727KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 728KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 729KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 730KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 731KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 732 733ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 734KBUILD_CFLAGS += -O2 735else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 736KBUILD_CFLAGS += -O3 737else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 738KBUILD_CFLAGS += -Os 739endif 740 741# Tell gcc to never replace conditional load with a non-conditional one 742KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 743KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 744 745ifdef CONFIG_READABLE_ASM 746# Disable optimizations that make assembler listings hard to read. 747# reorder blocks reorders the control in the function 748# ipa clone creates specialized cloned functions 749# partial inlining inlines only parts of functions 750KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 751 $(call cc-option,-fno-ipa-cp-clone,) \ 752 $(call cc-option,-fno-partial-inlining) 753endif 754 755ifneq ($(CONFIG_FRAME_WARN),0) 756KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 757endif 758 759stackp-flags-y := -fno-stack-protector 760stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 761stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 762 763KBUILD_CFLAGS += $(stackp-flags-y) 764 765ifdef CONFIG_CC_IS_CLANG 766KBUILD_CPPFLAGS += -Qunused-arguments 767KBUILD_CFLAGS += -Wno-format-invalid-specifier 768KBUILD_CFLAGS += -Wno-gnu 769# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 770# source of a reference will be _MergedGlobals and not on of the whitelisted names. 771# See modpost pattern 2 772KBUILD_CFLAGS += -mno-global-merge 773else 774 775# These warnings generated too much noise in a regular build. 776# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 777KBUILD_CFLAGS += -Wno-unused-but-set-variable 778 779# Warn about unmarked fall-throughs in switch statement. 780# Disabled for clang while comment to attribute conversion happens and 781# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 782KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 783endif 784 785KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 786ifdef CONFIG_FRAME_POINTER 787KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 788else 789# Some targets (ARM with Thumb2, for example), can't be built with frame 790# pointers. For those, we don't have FUNCTION_TRACER automatically 791# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 792# incompatible with -fomit-frame-pointer with current GCC, so we don't use 793# -fomit-frame-pointer with FUNCTION_TRACER. 794ifndef CONFIG_FUNCTION_TRACER 795KBUILD_CFLAGS += -fomit-frame-pointer 796endif 797endif 798 799# Initialize all stack variables with a 0xAA pattern. 800ifdef CONFIG_INIT_STACK_ALL_PATTERN 801KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 802endif 803 804# Initialize all stack variables with a zero value. 805ifdef CONFIG_INIT_STACK_ALL_ZERO 806# Future support for zero initialization is still being debated, see 807# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 808# renamed or dropped. 809KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 810KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 811endif 812 813DEBUG_CFLAGS := 814 815# Workaround for GCC versions < 5.0 816# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 817ifdef CONFIG_CC_IS_GCC 818DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 819endif 820 821ifdef CONFIG_DEBUG_INFO 822 823ifdef CONFIG_DEBUG_INFO_SPLIT 824DEBUG_CFLAGS += -gsplit-dwarf 825else 826DEBUG_CFLAGS += -g 827endif 828 829ifneq ($(LLVM_IAS),1) 830KBUILD_AFLAGS += -Wa,-gdwarf-2 831endif 832 833ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 834dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 835dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 836DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 837endif 838 839ifdef CONFIG_DEBUG_INFO_REDUCED 840DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 841 $(call cc-option,-fno-var-tracking) 842endif 843 844ifdef CONFIG_DEBUG_INFO_COMPRESSED 845DEBUG_CFLAGS += -gz=zlib 846KBUILD_AFLAGS += -gz=zlib 847KBUILD_LDFLAGS += --compress-debug-sections=zlib 848endif 849 850endif # CONFIG_DEBUG_INFO 851 852KBUILD_CFLAGS += $(DEBUG_CFLAGS) 853export DEBUG_CFLAGS 854 855ifdef CONFIG_FUNCTION_TRACER 856ifdef CONFIG_FTRACE_MCOUNT_USE_CC 857 CC_FLAGS_FTRACE += -mrecord-mcount 858 ifdef CONFIG_HAVE_NOP_MCOUNT 859 ifeq ($(call cc-option-yn, -mnop-mcount),y) 860 CC_FLAGS_FTRACE += -mnop-mcount 861 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 862 endif 863 endif 864endif 865ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 866 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 867endif 868ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 869 ifdef CONFIG_HAVE_C_RECORDMCOUNT 870 BUILD_C_RECORDMCOUNT := y 871 export BUILD_C_RECORDMCOUNT 872 endif 873endif 874ifdef CONFIG_HAVE_FENTRY 875 ifeq ($(call cc-option-yn, -mfentry),y) 876 CC_FLAGS_FTRACE += -mfentry 877 CC_FLAGS_USING += -DCC_USING_FENTRY 878 endif 879endif 880export CC_FLAGS_FTRACE 881KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 882KBUILD_AFLAGS += $(CC_FLAGS_USING) 883endif 884 885# We trigger additional mismatches with less inlining 886ifdef CONFIG_DEBUG_SECTION_MISMATCH 887KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 888endif 889 890ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 891KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 892LDFLAGS_vmlinux += --gc-sections 893endif 894 895ifdef CONFIG_SHADOW_CALL_STACK 896CC_FLAGS_SCS := -fsanitize=shadow-call-stack 897KBUILD_CFLAGS += $(CC_FLAGS_SCS) 898export CC_FLAGS_SCS 899endif 900 901ifdef CONFIG_LTO_CLANG 902ifdef CONFIG_LTO_CLANG_THIN 903CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 904KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 905else 906CC_FLAGS_LTO := -flto 907endif 908CC_FLAGS_LTO += -fvisibility=hidden 909 910# Limit inlining across translation units to reduce binary size 911KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 912endif 913 914ifdef CONFIG_LTO 915KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 916KBUILD_AFLAGS += -fno-lto 917export CC_FLAGS_LTO 918endif 919 920ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 921KBUILD_CFLAGS += -falign-functions=32 922endif 923 924# arch Makefile may override CC so keep this after arch Makefile is included 925NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 926 927# warn about C99 declaration after statement 928KBUILD_CFLAGS += -Wdeclaration-after-statement 929 930# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 931KBUILD_CFLAGS += -Wvla 932 933# disable pointer signed / unsigned warnings in gcc 4.0 934KBUILD_CFLAGS += -Wno-pointer-sign 935 936# disable stringop warnings in gcc 8+ 937KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 938 939# We'll want to enable this eventually, but it's not going away for 5.7 at least 940KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 941KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 942KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 943 944# Another good warning that we'll want to enable eventually 945KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 946 947# Enabled with W=2, disabled by default as noisy 948KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 949 950# disable invalid "can't wrap" optimizations for signed / pointers 951KBUILD_CFLAGS += -fno-strict-overflow 952 953# Make sure -fstack-check isn't enabled (like gentoo apparently did) 954KBUILD_CFLAGS += -fno-stack-check 955 956# conserve stack if available 957KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 958 959# Prohibit date/time macros, which would make the build non-deterministic 960KBUILD_CFLAGS += -Werror=date-time 961 962# enforce correct pointer usage 963KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 964 965# Require designated initializers for all marked structures 966KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 967 968# change __FILE__ to the relative path from the srctree 969KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 970 971# include additional Makefiles when needed 972include-y := scripts/Makefile.extrawarn 973include-$(CONFIG_KASAN) += scripts/Makefile.kasan 974include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 975include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 976include-$(CONFIG_KCOV) += scripts/Makefile.kcov 977include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 978 979include $(addprefix $(srctree)/, $(include-y)) 980 981# scripts/Makefile.gcc-plugins is intentionally included last. 982# Do not add $(call cc-option,...) below this line. When you build the kernel 983# from the clean source tree, the GCC plugins do not exist at this point. 984 985# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 986KBUILD_CPPFLAGS += $(KCPPFLAGS) 987KBUILD_AFLAGS += $(KAFLAGS) 988KBUILD_CFLAGS += $(KCFLAGS) 989 990KBUILD_LDFLAGS_MODULE += --build-id=sha1 991LDFLAGS_vmlinux += --build-id=sha1 992 993ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 994LDFLAGS_vmlinux += $(call ld-option, -X,) 995endif 996 997ifeq ($(CONFIG_RELR),y) 998LDFLAGS_vmlinux += --pack-dyn-relocs=relr 999endif 1000 1001# We never want expected sections to be placed heuristically by the 1002# linker. All sections should be explicitly named in the linker script. 1003ifdef CONFIG_LD_ORPHAN_WARN 1004LDFLAGS_vmlinux += --orphan-handling=warn 1005endif 1006 1007# Align the bit size of userspace programs with the kernel 1008KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1009KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1010 1011# make the checker run with the right architecture 1012CHECKFLAGS += --arch=$(ARCH) 1013 1014# insure the checker run with the right endianness 1015CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1016 1017# the checker needs the correct machine size 1018CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1019 1020# Default kernel image to build when no specific target is given. 1021# KBUILD_IMAGE may be overruled on the command line or 1022# set in the environment 1023# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1024# this default value 1025export KBUILD_IMAGE ?= vmlinux 1026 1027# 1028# INSTALL_PATH specifies where to place the updated kernel and system map 1029# images. Default is /boot, but you can set it to other values 1030export INSTALL_PATH ?= /boot 1031 1032# 1033# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1034# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1035# an argument if needed. Otherwise it defaults to the kernel install path 1036# 1037export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1038 1039# 1040# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1041# relocations required by build roots. This is not defined in the 1042# makefile but the argument can be passed to make if needed. 1043# 1044 1045MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1046export MODLIB 1047 1048# 1049# INSTALL_MOD_STRIP, if defined, will cause modules to be 1050# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1051# the default option --strip-debug will be used. Otherwise, 1052# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1053 1054ifdef INSTALL_MOD_STRIP 1055ifeq ($(INSTALL_MOD_STRIP),1) 1056mod_strip_cmd = $(STRIP) --strip-debug 1057else 1058mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1059endif # INSTALL_MOD_STRIP=1 1060else 1061mod_strip_cmd = true 1062endif # INSTALL_MOD_STRIP 1063export mod_strip_cmd 1064 1065# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1066# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1067# or CONFIG_MODULE_COMPRESS_XZ. 1068 1069mod_compress_cmd = true 1070ifdef CONFIG_MODULE_COMPRESS 1071 ifdef CONFIG_MODULE_COMPRESS_GZIP 1072 mod_compress_cmd = $(KGZIP) -n -f 1073 endif # CONFIG_MODULE_COMPRESS_GZIP 1074 ifdef CONFIG_MODULE_COMPRESS_XZ 1075 mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f 1076 endif # CONFIG_MODULE_COMPRESS_XZ 1077endif # CONFIG_MODULE_COMPRESS 1078export mod_compress_cmd 1079 1080ifdef CONFIG_MODULE_SIG_ALL 1081$(eval $(call config_filename,MODULE_SIG_KEY)) 1082 1083mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1084else 1085mod_sign_cmd = true 1086endif 1087export mod_sign_cmd 1088 1089HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1090 1091has_libelf = $(call try-run,\ 1092 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1093 1094ifdef CONFIG_STACK_VALIDATION 1095 ifeq ($(has_libelf),1) 1096 objtool_target := tools/objtool FORCE 1097 else 1098 SKIP_STACK_VALIDATION := 1 1099 export SKIP_STACK_VALIDATION 1100 endif 1101endif 1102 1103PHONY += resolve_btfids_clean 1104 1105resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1106 1107# tools/bpf/resolve_btfids directory might not exist 1108# in output directory, skip its clean in that case 1109resolve_btfids_clean: 1110ifneq ($(wildcard $(resolve_btfids_O)),) 1111 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1112endif 1113 1114ifdef CONFIG_BPF 1115ifdef CONFIG_DEBUG_INFO_BTF 1116 ifeq ($(has_libelf),1) 1117 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1118 else 1119 ERROR_RESOLVE_BTFIDS := 1 1120 endif 1121endif # CONFIG_DEBUG_INFO_BTF 1122endif # CONFIG_BPF 1123 1124PHONY += prepare0 1125 1126extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1127export MODORDER := $(extmod-prefix)modules.order 1128export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1129 1130ifeq ($(KBUILD_EXTMOD),) 1131core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1132 1133vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1134 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1135 $(libs-y) $(libs-m))) 1136 1137vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1138 $(patsubst %/,%,$(filter %/, $(core-) \ 1139 $(drivers-) $(libs-)))) 1140 1141subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1142 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1143 $(drivers-y) $(drivers-m))) 1144 1145build-dirs := $(vmlinux-dirs) 1146clean-dirs := $(vmlinux-alldirs) 1147 1148# Externally visible symbols (used by link-vmlinux.sh) 1149KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1150KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1151ifdef CONFIG_MODULES 1152KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1153KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1154else 1155KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1156endif 1157KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1158 1159export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1160export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1161# used by scripts/Makefile.package 1162export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1163 1164vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1165 1166# Recurse until adjust_autoksyms.sh is satisfied 1167PHONY += autoksyms_recursive 1168ifdef CONFIG_TRIM_UNUSED_KSYMS 1169# For the kernel to actually contain only the needed exported symbols, 1170# we have to build modules as well to determine what those symbols are. 1171# (this can be evaluated only once include/config/auto.conf has been included) 1172KBUILD_MODULES := 1 1173 1174autoksyms_recursive: descend modules.order 1175 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1176 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1177endif 1178 1179autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1180 1181quiet_cmd_autoksyms_h = GEN $@ 1182 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1183 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1184 1185$(autoksyms_h): 1186 $(call cmd,autoksyms_h) 1187 1188ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1189 1190# Final link of vmlinux with optional arch pass after final link 1191cmd_link-vmlinux = \ 1192 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1193 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1194 1195vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1196 +$(call if_changed,link-vmlinux) 1197 1198targets := vmlinux 1199 1200# The actual objects are generated when descending, 1201# make sure no implicit rule kicks in 1202$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1203 1204filechk_kernel.release = \ 1205 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1206 1207# Store (new) KERNELRELEASE string in include/config/kernel.release 1208include/config/kernel.release: FORCE 1209 $(call filechk,kernel.release) 1210 1211# Additional helpers built in scripts/ 1212# Carefully list dependencies so we do not try to build scripts twice 1213# in parallel 1214PHONY += scripts 1215scripts: scripts_basic scripts_dtc 1216 $(Q)$(MAKE) $(build)=$(@) 1217 1218# Things we need to do before we recursively start building the kernel 1219# or the modules are listed in "prepare". 1220# A multi level approach is used. prepareN is processed before prepareN-1. 1221# archprepare is used in arch Makefiles and when processed asm symlink, 1222# version.h and scripts_basic is processed / created. 1223 1224PHONY += prepare archprepare 1225 1226archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1227 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1228 include/generated/autoconf.h 1229 1230prepare0: archprepare 1231 $(Q)$(MAKE) $(build)=scripts/mod 1232 $(Q)$(MAKE) $(build)=. 1233 1234# All the preparing.. 1235prepare: prepare0 prepare-objtool prepare-resolve_btfids 1236 1237# Support for using generic headers in asm-generic 1238asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1239 1240PHONY += asm-generic uapi-asm-generic 1241asm-generic: uapi-asm-generic 1242 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1243 generic=include/asm-generic 1244uapi-asm-generic: 1245 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1246 generic=include/uapi/asm-generic 1247 1248PHONY += prepare-objtool prepare-resolve_btfids 1249prepare-objtool: $(objtool_target) 1250ifeq ($(SKIP_STACK_VALIDATION),1) 1251ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1252 @echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1253 @false 1254endif 1255ifdef CONFIG_UNWINDER_ORC 1256 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1257 @false 1258else 1259 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1260endif 1261endif 1262 1263prepare-resolve_btfids: $(resolve_btfids_target) 1264ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1265 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1266 @false 1267endif 1268# Generate some files 1269# --------------------------------------------------------------------------- 1270 1271# KERNELRELEASE can change from a few different places, meaning version.h 1272# needs to be updated, so this check is forced on all builds 1273 1274uts_len := 64 1275define filechk_utsrelease.h 1276 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1277 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1278 exit 1; \ 1279 fi; \ 1280 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1281endef 1282 1283define filechk_version.h 1284 if [ $(SUBLEVEL) -gt 255 ]; then \ 1285 echo \#define LINUX_VERSION_CODE $(shell \ 1286 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1287 else \ 1288 echo \#define LINUX_VERSION_CODE $(shell \ 1289 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1290 fi; \ 1291 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1292 ((c) > 255 ? 255 : (c)))'; \ 1293 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1294 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1295 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1296endef 1297 1298$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1299$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1300$(version_h): FORCE 1301 $(call filechk,version.h) 1302 1303include/generated/utsrelease.h: include/config/kernel.release FORCE 1304 $(call filechk,utsrelease.h) 1305 1306PHONY += headerdep 1307headerdep: 1308 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1309 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1310 1311# --------------------------------------------------------------------------- 1312# Kernel headers 1313 1314#Default location for installed headers 1315export INSTALL_HDR_PATH = $(objtree)/usr 1316 1317quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1318 cmd_headers_install = \ 1319 mkdir -p $(INSTALL_HDR_PATH); \ 1320 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1321 usr/include $(INSTALL_HDR_PATH) 1322 1323PHONY += headers_install 1324headers_install: headers 1325 $(call cmd,headers_install) 1326 1327PHONY += archheaders archscripts 1328 1329hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1330 1331PHONY += headers 1332headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1333 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1334 $(error Headers not exportable for the $(SRCARCH) architecture)) 1335 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1336 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1337 1338# Deprecated. It is no-op now. 1339PHONY += headers_check 1340headers_check: 1341 @: 1342 1343ifdef CONFIG_HEADERS_INSTALL 1344prepare: headers 1345endif 1346 1347PHONY += scripts_unifdef 1348scripts_unifdef: scripts_basic 1349 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1350 1351# --------------------------------------------------------------------------- 1352# Kernel selftest 1353 1354PHONY += kselftest 1355kselftest: 1356 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1357 1358kselftest-%: FORCE 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1360 1361PHONY += kselftest-merge 1362kselftest-merge: 1363 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1364 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1365 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1366 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1367 1368# --------------------------------------------------------------------------- 1369# Devicetree files 1370 1371ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1372dtstree := arch/$(SRCARCH)/boot/dts 1373endif 1374 1375ifneq ($(dtstree),) 1376 1377%.dtb: include/config/kernel.release scripts_dtc 1378 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1379 1380%.dtbo: include/config/kernel.release scripts_dtc 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1382 1383PHONY += dtbs dtbs_install dtbs_check 1384dtbs: include/config/kernel.release scripts_dtc 1385 $(Q)$(MAKE) $(build)=$(dtstree) 1386 1387ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1388export CHECK_DTBS=y 1389dtbs: dt_binding_check 1390endif 1391 1392dtbs_check: dtbs 1393 1394dtbs_install: 1395 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1396 1397ifdef CONFIG_OF_EARLY_FLATTREE 1398all: dtbs 1399endif 1400 1401endif 1402 1403PHONY += scripts_dtc 1404scripts_dtc: scripts_basic 1405 $(Q)$(MAKE) $(build)=scripts/dtc 1406 1407ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1408export CHECK_DT_BINDING=y 1409endif 1410 1411PHONY += dt_binding_check 1412dt_binding_check: scripts_dtc 1413 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1414 1415# --------------------------------------------------------------------------- 1416# Modules 1417 1418ifdef CONFIG_MODULES 1419 1420# By default, build modules as well 1421 1422all: modules 1423 1424# When we're building modules with modversions, we need to consider 1425# the built-in objects during the descend as well, in order to 1426# make sure the checksums are up to date before we record them. 1427ifdef CONFIG_MODVERSIONS 1428 KBUILD_BUILTIN := 1 1429endif 1430 1431# Build modules 1432# 1433# A module can be listed more than once in obj-m resulting in 1434# duplicate lines in modules.order files. Those are removed 1435# using awk while concatenating to the final file. 1436 1437PHONY += modules 1438modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1439 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1440 1441PHONY += modules_check 1442modules_check: modules.order 1443 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1444 1445cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1446 1447modules.order: $(subdir-modorder) FORCE 1448 $(call if_changed,modules_order) 1449 1450targets += modules.order 1451 1452# Target to prepare building external modules 1453PHONY += modules_prepare 1454modules_prepare: prepare 1455 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1456 1457# Target to install modules 1458PHONY += modules_install 1459modules_install: _modinst_ _modinst_post 1460 1461PHONY += _modinst_ 1462_modinst_: 1463 @rm -rf $(MODLIB)/kernel 1464 @rm -f $(MODLIB)/source 1465 @mkdir -p $(MODLIB)/kernel 1466 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1467 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1468 rm -f $(MODLIB)/build ; \ 1469 ln -s $(CURDIR) $(MODLIB)/build ; \ 1470 fi 1471 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1472 @cp -f modules.builtin $(MODLIB)/ 1473 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1474 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1475 1476# This depmod is only for convenience to give the initial 1477# boot a modules.dep even before / is mounted read-write. However the 1478# boot script depmod is the master version. 1479PHONY += _modinst_post 1480_modinst_post: _modinst_ 1481 $(call cmd,depmod) 1482 1483ifeq ($(CONFIG_MODULE_SIG), y) 1484PHONY += modules_sign 1485modules_sign: 1486 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1487endif 1488 1489else # CONFIG_MODULES 1490 1491# Modules not configured 1492# --------------------------------------------------------------------------- 1493 1494PHONY += modules modules_install 1495modules modules_install: 1496 @echo >&2 1497 @echo >&2 "The present kernel configuration has modules disabled." 1498 @echo >&2 "Type 'make config' and enable loadable module support." 1499 @echo >&2 "Then build a kernel with module support enabled." 1500 @echo >&2 1501 @exit 1 1502 1503endif # CONFIG_MODULES 1504 1505### 1506# Cleaning is done on three levels. 1507# make clean Delete most generated files 1508# Leave enough to build external modules 1509# make mrproper Delete the current configuration, and all generated files 1510# make distclean Remove editor backup files, patch leftover files and the like 1511 1512# Directories & files removed with 'make clean' 1513CLEAN_FILES += include/ksym vmlinux.symvers \ 1514 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1515 compile_commands.json .thinlto-cache 1516 1517# Directories & files removed with 'make mrproper' 1518MRPROPER_FILES += include/config include/generated \ 1519 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1520 debian snap tar-install \ 1521 .config .config.old .version \ 1522 Module.symvers \ 1523 signing_key.pem signing_key.priv signing_key.x509 \ 1524 x509.genkey extra_certificates signing_key.x509.keyid \ 1525 signing_key.x509.signer vmlinux-gdb.py \ 1526 *.spec 1527 1528# Directories & files removed with 'make distclean' 1529DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1530 1531# clean - Delete most, but leave enough to build external modules 1532# 1533clean: rm-files := $(CLEAN_FILES) 1534 1535PHONY += archclean vmlinuxclean 1536 1537vmlinuxclean: 1538 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1539 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1540 1541clean: archclean vmlinuxclean resolve_btfids_clean 1542 1543# mrproper - Delete all generated files, including .config 1544# 1545mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1546mrproper-dirs := $(addprefix _mrproper_,scripts) 1547 1548PHONY += $(mrproper-dirs) mrproper 1549$(mrproper-dirs): 1550 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1551 1552mrproper: clean $(mrproper-dirs) 1553 $(call cmd,rmfiles) 1554 1555# distclean 1556# 1557distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1558 1559PHONY += distclean 1560 1561distclean: mrproper 1562 $(call cmd,rmfiles) 1563 @find $(srctree) $(RCS_FIND_IGNORE) \ 1564 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1565 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1566 -o -name 'core' \) \ 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 1734# be used. 1735# 1736# The following are the only valid targets when building external 1737# modules. 1738# make M=dir clean Delete all automatically generated files 1739# make M=dir modules Make all modules in specified dir 1740# make M=dir Same as 'make M=dir modules' 1741# make M=dir modules_install 1742# Install the modules built in the module directory 1743# Assumes install directory is already created 1744 1745# We are always building only modules. 1746KBUILD_BUILTIN := 1747KBUILD_MODULES := 1 1748 1749build-dirs := $(KBUILD_EXTMOD) 1750PHONY += modules 1751modules: $(MODORDER) 1752 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1753 1754$(MODORDER): descend 1755 @: 1756 1757PHONY += modules_install 1758modules_install: _emodinst_ _emodinst_post 1759 1760install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1761PHONY += _emodinst_ 1762_emodinst_: 1763 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1764 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1765 1766PHONY += _emodinst_post 1767_emodinst_post: _emodinst_ 1768 $(call cmd,depmod) 1769 1770compile_commands.json: $(extmod-prefix)compile_commands.json 1771PHONY += compile_commands.json 1772 1773clean-dirs := $(KBUILD_EXTMOD) 1774clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1775 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1776 1777PHONY += help 1778help: 1779 @echo ' Building external modules.' 1780 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1781 @echo '' 1782 @echo ' modules - default target, build the module(s)' 1783 @echo ' modules_install - install the module' 1784 @echo ' clean - remove generated files in module directory only' 1785 @echo '' 1786 1787# no-op for external module builds 1788PHONY += prepare modules_prepare 1789 1790endif # KBUILD_EXTMOD 1791 1792# Single targets 1793# --------------------------------------------------------------------------- 1794# To build individual files in subdirectories, you can do like this: 1795# 1796# make foo/bar/baz.s 1797# 1798# The supported suffixes for single-target are listed in 'single-targets' 1799# 1800# To build only under specific subdirectories, you can do like this: 1801# 1802# make foo/bar/baz/ 1803 1804ifdef single-build 1805 1806# .ko is special because modpost is needed 1807single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1808single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1809 1810$(single-ko): single_modpost 1811 @: 1812$(single-no-ko): descend 1813 @: 1814 1815ifeq ($(KBUILD_EXTMOD),) 1816# For the single build of in-tree modules, use a temporary file to avoid 1817# the situation of modules_install installing an invalid modules.order. 1818MODORDER := .modules.tmp 1819endif 1820 1821PHONY += single_modpost 1822single_modpost: $(single-no-ko) modules_prepare 1823 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1824 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1825 1826KBUILD_MODULES := 1 1827 1828export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1829 1830# trim unrelated directories 1831build-dirs := $(foreach d, $(build-dirs), \ 1832 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1833 1834endif 1835 1836ifndef CONFIG_MODULES 1837KBUILD_MODULES := 1838endif 1839 1840# Handle descending into subdirectories listed in $(build-dirs) 1841# Preset locale variables to speed up the build process. Limit locale 1842# tweaks to this spot to avoid wrong language settings when running 1843# make menuconfig etc. 1844# Error messages still appears in the original language 1845PHONY += descend $(build-dirs) 1846descend: $(build-dirs) 1847$(build-dirs): prepare 1848 $(Q)$(MAKE) $(build)=$@ \ 1849 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1850 need-builtin=1 need-modorder=1 1851 1852clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1853PHONY += $(clean-dirs) clean 1854$(clean-dirs): 1855 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1856 1857clean: $(clean-dirs) 1858 $(call cmd,rmfiles) 1859 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1860 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1861 -o -name '*.ko.*' \ 1862 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1863 -o -name '*.dwo' -o -name '*.lst' \ 1864 -o -name '*.su' -o -name '*.mod' \ 1865 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1866 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1867 -o -name '*.asn1.[ch]' \ 1868 -o -name '*.symtypes' -o -name 'modules.order' \ 1869 -o -name '.tmp_*.o.*' \ 1870 -o -name '*.c.[012]*.*' \ 1871 -o -name '*.ll' \ 1872 -o -name '*.gcno' \ 1873 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1874 1875# Generate tags for editors 1876# --------------------------------------------------------------------------- 1877quiet_cmd_tags = GEN $@ 1878 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1879 1880tags TAGS cscope gtags: FORCE 1881 $(call cmd,tags) 1882 1883# Script to generate missing namespace dependencies 1884# --------------------------------------------------------------------------- 1885 1886PHONY += nsdeps 1887nsdeps: export KBUILD_NSDEPS=1 1888nsdeps: modules 1889 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1890 1891# Clang Tooling 1892# --------------------------------------------------------------------------- 1893 1894quiet_cmd_gen_compile_commands = GEN $@ 1895 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1896 1897$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1898 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1899 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1900 $(call if_changed,gen_compile_commands) 1901 1902targets += $(extmod-prefix)compile_commands.json 1903 1904PHONY += clang-tidy clang-analyzer 1905 1906ifdef CONFIG_CC_IS_CLANG 1907quiet_cmd_clang_tools = CHECK $< 1908 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1909 1910clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1911 $(call cmd,clang_tools) 1912else 1913clang-tidy clang-analyzer: 1914 @echo "$@ requires CC=clang" >&2 1915 @false 1916endif 1917 1918# Scripts to check various things for consistency 1919# --------------------------------------------------------------------------- 1920 1921PHONY += includecheck versioncheck coccicheck export_report 1922 1923includecheck: 1924 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1925 -name '*.[hcS]' -type f -print | sort \ 1926 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1927 1928versioncheck: 1929 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1930 -name '*.[hcS]' -type f -print | sort \ 1931 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1932 1933coccicheck: 1934 $(Q)$(BASH) $(srctree)/scripts/$@ 1935 1936export_report: 1937 $(PERL) $(srctree)/scripts/export_report.pl 1938 1939PHONY += checkstack kernelrelease kernelversion image_name 1940 1941# UML needs a little special treatment here. It wants to use the host 1942# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1943# else wants $(ARCH), including people doing cross-builds, which means 1944# that $(SUBARCH) doesn't work here. 1945ifeq ($(ARCH), um) 1946CHECKSTACK_ARCH := $(SUBARCH) 1947else 1948CHECKSTACK_ARCH := $(ARCH) 1949endif 1950checkstack: 1951 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1952 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1953 1954kernelrelease: 1955 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1956 1957kernelversion: 1958 @echo $(KERNELVERSION) 1959 1960image_name: 1961 @echo $(KBUILD_IMAGE) 1962 1963# Clear a bunch of variables before executing the submake 1964 1965ifeq ($(quiet),silent_) 1966tools_silent=s 1967endif 1968 1969tools/: FORCE 1970 $(Q)mkdir -p $(objtree)/tools 1971 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1972 1973tools/%: FORCE 1974 $(Q)mkdir -p $(objtree)/tools 1975 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1976 1977quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1978 cmd_rmfiles = rm -rf $(rm-files) 1979 1980# Run depmod only if we have System.map and depmod is executable 1981quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1982 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1983 $(KERNELRELEASE) 1984 1985# read saved command lines for existing targets 1986existing-targets := $(wildcard $(sort $(targets))) 1987 1988-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1989 1990endif # config-build 1991endif # mixed-build 1992endif # need-sub-make 1993 1994PHONY += FORCE 1995FORCE: 1996 1997# Declare the contents of the PHONY variable as phony. We keep that 1998# information in a variable so we can use it in if_changed and friends. 1999.PHONY: $(PHONY) 2000