1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = 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 434export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 435 -O2 -fomit-frame-pointer -std=gnu11 \ 436 -Wdeclaration-after-statement 437export KBUILD_USERLDFLAGS := 438 439KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(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=gnu11 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 534 535export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 536export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 537export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 538export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 539export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 540export PAHOLE_FLAGS 541 542# Files to ignore in find ... statements 543 544export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 545 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 546 -prune -o 547export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 548 --exclude CVS --exclude .pc --exclude .hg --exclude .git 549 550# =========================================================================== 551# Rules shared between *config targets and build targets 552 553# Basic helpers built in scripts/basic/ 554PHONY += scripts_basic 555scripts_basic: 556 $(Q)$(MAKE) $(build)=scripts/basic 557 558PHONY += outputmakefile 559ifdef building_out_of_srctree 560# Before starting out-of-tree build, make sure the source tree is clean. 561# outputmakefile generates a Makefile in the output directory, if using a 562# separate output directory. This allows convenient use of make in the 563# output directory. 564# At the same time when output Makefile generated, generate .gitignore to 565# ignore whole output directory 566 567quiet_cmd_makefile = GEN Makefile 568 cmd_makefile = { \ 569 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 570 echo "include $(srctree)/Makefile"; \ 571 } > Makefile 572 573outputmakefile: 574 $(Q)if [ -f $(srctree)/.config -o \ 575 -d $(srctree)/include/config -o \ 576 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 577 echo >&2 "***"; \ 578 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 579 echo >&2 "*** in $(abs_srctree)";\ 580 echo >&2 "***"; \ 581 false; \ 582 fi 583 $(Q)ln -fsn $(srctree) source 584 $(call cmd,makefile) 585 $(Q)test -e .gitignore || \ 586 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 587endif 588 589# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 590# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 591# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 592# and from include/config/auto.conf.cmd to detect the compiler upgrade. 593CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 594 595ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 596include $(srctree)/scripts/Makefile.clang 597endif 598 599# Include this also for config targets because some architectures need 600# cc-cross-prefix to determine CROSS_COMPILE. 601ifdef need-compiler 602include $(srctree)/scripts/Makefile.compiler 603endif 604 605ifdef config-build 606# =========================================================================== 607# *config targets only - make sure prerequisites are updated, and descend 608# in scripts/kconfig to make the *config target 609 610# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 611# KBUILD_DEFCONFIG may point out an alternative default configuration 612# used for 'make defconfig' 613include $(srctree)/arch/$(SRCARCH)/Makefile 614export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 615 616config: outputmakefile scripts_basic FORCE 617 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 618 619%config: outputmakefile scripts_basic FORCE 620 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 621 622else #!config-build 623# =========================================================================== 624# Build targets only - this includes vmlinux, arch specific targets, clean 625# targets and others. In general all targets except *config targets. 626 627# If building an external module we do not care about the all: rule 628# but instead __all depend on modules 629PHONY += all 630ifeq ($(KBUILD_EXTMOD),) 631__all: all 632else 633__all: modules 634endif 635 636# Decide whether to build built-in, modular, or both. 637# Normally, just do built-in. 638 639KBUILD_MODULES := 640KBUILD_BUILTIN := 1 641 642# If we have only "make modules", don't compile built-in objects. 643ifeq ($(MAKECMDGOALS),modules) 644 KBUILD_BUILTIN := 645endif 646 647# If we have "make <whatever> modules", compile modules 648# in addition to whatever we do anyway. 649# Just "make" or "make all" shall build modules as well 650 651ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 652 KBUILD_MODULES := 1 653endif 654 655ifeq ($(MAKECMDGOALS),) 656 KBUILD_MODULES := 1 657endif 658 659export KBUILD_MODULES KBUILD_BUILTIN 660 661ifdef need-config 662include include/config/auto.conf 663endif 664 665ifeq ($(KBUILD_EXTMOD),) 666# Objects we will link into vmlinux / subdirs we need to visit 667core-y := init/ usr/ arch/$(SRCARCH)/ 668drivers-y := drivers/ sound/ 669drivers-$(CONFIG_SAMPLES) += samples/ 670drivers-$(CONFIG_NET) += net/ 671drivers-y += virt/ 672libs-y := lib/ 673endif # KBUILD_EXTMOD 674 675# The all: target is the default when no target is given on the 676# command line. 677# This allow a user to issue only 'make' to build a kernel including modules 678# Defaults to vmlinux, but the arch makefile usually adds further targets 679all: vmlinux 680 681CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 682ifdef CONFIG_CC_IS_GCC 683CFLAGS_GCOV += -fno-tree-loop-im 684endif 685export CFLAGS_GCOV 686 687# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 688ifdef CONFIG_FUNCTION_TRACER 689 CC_FLAGS_FTRACE := -pg 690endif 691 692include $(srctree)/arch/$(SRCARCH)/Makefile 693 694ifdef need-config 695ifdef may-sync-config 696# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 697# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 698# because some architectures define CROSS_COMPILE there. 699include include/config/auto.conf.cmd 700 701$(KCONFIG_CONFIG): 702 @echo >&2 '***' 703 @echo >&2 '*** Configuration file "$@" not found!' 704 @echo >&2 '***' 705 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 706 @echo >&2 '*** "make menuconfig" or "make xconfig").' 707 @echo >&2 '***' 708 @/bin/false 709 710# The actual configuration files used during the build are stored in 711# include/generated/ and include/config/. Update them if .config is newer than 712# include/config/auto.conf (which mirrors .config). 713# 714# This exploits the 'multi-target pattern rule' trick. 715# The syncconfig should be executed only once to make all the targets. 716# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 717# 718# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 719# so you cannot notice that Kconfig is waiting for the user input. 720%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 721 $(Q)$(kecho) " SYNC $@" 722 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 723else # !may-sync-config 724# External modules and some install targets need include/generated/autoconf.h 725# and include/config/auto.conf but do not care if they are up-to-date. 726# Use auto.conf to trigger the test 727PHONY += include/config/auto.conf 728 729include/config/auto.conf: 730 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 731 echo >&2; \ 732 echo >&2 " ERROR: Kernel configuration is invalid."; \ 733 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 734 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 735 echo >&2 ; \ 736 /bin/false) 737 738endif # may-sync-config 739endif # need-config 740 741KBUILD_CFLAGS += -fno-delete-null-pointer-checks 742KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 743KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 744KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 745KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 746 747ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 748KBUILD_CFLAGS += -O2 749else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 750KBUILD_CFLAGS += -O3 751else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 752KBUILD_CFLAGS += -Os 753endif 754 755# Tell gcc to never replace conditional load with a non-conditional one 756ifdef CONFIG_CC_IS_GCC 757# gcc-10 renamed --param=allow-store-data-races=0 to 758# -fno-allow-store-data-races. 759KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 760KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 761endif 762 763ifdef CONFIG_READABLE_ASM 764# Disable optimizations that make assembler listings hard to read. 765# reorder blocks reorders the control in the function 766# ipa clone creates specialized cloned functions 767# partial inlining inlines only parts of functions 768KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 769endif 770 771ifneq ($(CONFIG_FRAME_WARN),0) 772KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 773endif 774 775stackp-flags-y := -fno-stack-protector 776stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 777stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 778 779KBUILD_CFLAGS += $(stackp-flags-y) 780 781KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 782KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 783 784ifdef CONFIG_CC_IS_CLANG 785KBUILD_CPPFLAGS += -Qunused-arguments 786# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 787KBUILD_CFLAGS += -Wno-gnu 788# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 789# source of a reference will be _MergedGlobals and not on of the whitelisted names. 790# See modpost pattern 2 791KBUILD_CFLAGS += -mno-global-merge 792else 793 794# gcc inanely warns about local variables called 'main' 795KBUILD_CFLAGS += -Wno-main 796endif 797 798# These warnings generated too much noise in a regular build. 799# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 800KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 801KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 802 803ifdef CONFIG_FRAME_POINTER 804KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 805else 806# Some targets (ARM with Thumb2, for example), can't be built with frame 807# pointers. For those, we don't have FUNCTION_TRACER automatically 808# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 809# incompatible with -fomit-frame-pointer with current GCC, so we don't use 810# -fomit-frame-pointer with FUNCTION_TRACER. 811ifndef CONFIG_FUNCTION_TRACER 812KBUILD_CFLAGS += -fomit-frame-pointer 813endif 814endif 815 816# Initialize all stack variables with a 0xAA pattern. 817ifdef CONFIG_INIT_STACK_ALL_PATTERN 818KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 819endif 820 821# Initialize all stack variables with a zero value. 822ifdef CONFIG_INIT_STACK_ALL_ZERO 823KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 824ifdef CONFIG_CC_IS_CLANG 825# https://bugs.llvm.org/show_bug.cgi?id=45497 826KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 827endif 828endif 829 830# While VLAs have been removed, GCC produces unreachable stack probes 831# for the randomize_kstack_offset feature. Disable it for all compilers. 832KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 833 834# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 835ifdef CONFIG_ZERO_CALL_USED_REGS 836KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 837endif 838 839ifdef CONFIG_FUNCTION_TRACER 840ifdef CONFIG_FTRACE_MCOUNT_USE_CC 841 CC_FLAGS_FTRACE += -mrecord-mcount 842 ifdef CONFIG_HAVE_NOP_MCOUNT 843 ifeq ($(call cc-option-yn, -mnop-mcount),y) 844 CC_FLAGS_FTRACE += -mnop-mcount 845 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 846 endif 847 endif 848endif 849ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 850 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 851endif 852ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 853 ifdef CONFIG_HAVE_C_RECORDMCOUNT 854 BUILD_C_RECORDMCOUNT := y 855 export BUILD_C_RECORDMCOUNT 856 endif 857endif 858ifdef CONFIG_HAVE_FENTRY 859 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 860 ifeq ($(call cc-option-yn, -mfentry),y) 861 CC_FLAGS_FTRACE += -mfentry 862 CC_FLAGS_USING += -DCC_USING_FENTRY 863 endif 864endif 865export CC_FLAGS_FTRACE 866KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 867KBUILD_AFLAGS += $(CC_FLAGS_USING) 868endif 869 870# We trigger additional mismatches with less inlining 871ifdef CONFIG_DEBUG_SECTION_MISMATCH 872KBUILD_CFLAGS += -fno-inline-functions-called-once 873endif 874 875ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 876KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 877LDFLAGS_vmlinux += --gc-sections 878endif 879 880ifdef CONFIG_SHADOW_CALL_STACK 881CC_FLAGS_SCS := -fsanitize=shadow-call-stack 882KBUILD_CFLAGS += $(CC_FLAGS_SCS) 883export CC_FLAGS_SCS 884endif 885 886ifdef CONFIG_LTO_CLANG 887ifdef CONFIG_LTO_CLANG_THIN 888CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 889KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 890else 891CC_FLAGS_LTO := -flto 892endif 893CC_FLAGS_LTO += -fvisibility=hidden 894 895# Limit inlining across translation units to reduce binary size 896KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 897 898# Check for frame size exceeding threshold during prolog/epilog insertion 899# when using lld < 13.0.0. 900ifneq ($(CONFIG_FRAME_WARN),0) 901ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 902KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 903endif 904endif 905endif 906 907ifdef CONFIG_LTO 908KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 909KBUILD_AFLAGS += -fno-lto 910export CC_FLAGS_LTO 911endif 912 913ifdef CONFIG_CFI_CLANG 914CC_FLAGS_CFI := -fsanitize=cfi \ 915 -fsanitize-cfi-cross-dso \ 916 -fno-sanitize-cfi-canonical-jump-tables \ 917 -fno-sanitize-trap=cfi \ 918 -fno-sanitize-blacklist 919 920ifdef CONFIG_CFI_PERMISSIVE 921CC_FLAGS_CFI += -fsanitize-recover=cfi 922endif 923 924# If LTO flags are filtered out, we must also filter out CFI. 925CC_FLAGS_LTO += $(CC_FLAGS_CFI) 926KBUILD_CFLAGS += $(CC_FLAGS_CFI) 927export CC_FLAGS_CFI 928endif 929 930ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 931KBUILD_CFLAGS += -falign-functions=64 932endif 933 934# arch Makefile may override CC so keep this after arch Makefile is included 935NOSTDINC_FLAGS += -nostdinc 936 937# warn about C99 declaration after statement 938KBUILD_CFLAGS += -Wdeclaration-after-statement 939 940# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 941KBUILD_CFLAGS += -Wvla 942 943# disable pointer signed / unsigned warnings in gcc 4.0 944KBUILD_CFLAGS += -Wno-pointer-sign 945 946# In order to make sure new function cast mismatches are not introduced 947# in the kernel (to avoid tripping CFI checking), the kernel should be 948# globally built with -Wcast-function-type. 949KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 950 951# disable stringop warnings in gcc 8+ 952KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 953 954# We'll want to enable this eventually, but it's not going away for 5.7 at least 955KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 956 957# Another good warning that we'll want to enable eventually 958KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 959 960# Enabled with W=2, disabled by default as noisy 961ifdef CONFIG_CC_IS_GCC 962KBUILD_CFLAGS += -Wno-maybe-uninitialized 963endif 964 965ifdef CONFIG_CC_IS_GCC 966# The allocators already balk at large sizes, so silence the compiler 967# warnings for bounds checks involving those possible values. While 968# -Wno-alloc-size-larger-than would normally be used here, earlier versions 969# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 970# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 971# doesn't work (as it is documented to), silently resolving to "0" prior to 972# version 9.1 (and producing an error more recently). Numeric values larger 973# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 974# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 975# choice, we must perform a versioned check to disable this warning. 976# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 977KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 978endif 979 980# disable invalid "can't wrap" optimizations for signed / pointers 981KBUILD_CFLAGS += -fno-strict-overflow 982 983# Make sure -fstack-check isn't enabled (like gentoo apparently did) 984KBUILD_CFLAGS += -fno-stack-check 985 986# conserve stack if available 987ifdef CONFIG_CC_IS_GCC 988KBUILD_CFLAGS += -fconserve-stack 989endif 990 991# Prohibit date/time macros, which would make the build non-deterministic 992KBUILD_CFLAGS += -Werror=date-time 993 994# enforce correct pointer usage 995KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 996 997# Require designated initializers for all marked structures 998KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 999 1000# change __FILE__ to the relative path from the srctree 1001KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1002 1003# include additional Makefiles when needed 1004include-y := scripts/Makefile.extrawarn 1005include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1006include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1007include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1008include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1009include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1010include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1011 1012include $(addprefix $(srctree)/, $(include-y)) 1013 1014# scripts/Makefile.gcc-plugins is intentionally included last. 1015# Do not add $(call cc-option,...) below this line. When you build the kernel 1016# from the clean source tree, the GCC plugins do not exist at this point. 1017 1018# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1019KBUILD_CPPFLAGS += $(KCPPFLAGS) 1020KBUILD_AFLAGS += $(KAFLAGS) 1021KBUILD_CFLAGS += $(KCFLAGS) 1022 1023KBUILD_LDFLAGS_MODULE += --build-id=sha1 1024LDFLAGS_vmlinux += --build-id=sha1 1025 1026ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1027LDFLAGS_vmlinux += $(call ld-option, -X,) 1028endif 1029 1030ifeq ($(CONFIG_RELR),y) 1031LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1032endif 1033 1034# We never want expected sections to be placed heuristically by the 1035# linker. All sections should be explicitly named in the linker script. 1036ifdef CONFIG_LD_ORPHAN_WARN 1037LDFLAGS_vmlinux += --orphan-handling=warn 1038endif 1039 1040# Align the bit size of userspace programs with the kernel 1041KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1042KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1043 1044# make the checker run with the right architecture 1045CHECKFLAGS += --arch=$(ARCH) 1046 1047# insure the checker run with the right endianness 1048CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1049 1050# the checker needs the correct machine size 1051CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1052 1053# Default kernel image to build when no specific target is given. 1054# KBUILD_IMAGE may be overruled on the command line or 1055# set in the environment 1056# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1057# this default value 1058export KBUILD_IMAGE ?= vmlinux 1059 1060# 1061# INSTALL_PATH specifies where to place the updated kernel and system map 1062# images. Default is /boot, but you can set it to other values 1063export INSTALL_PATH ?= /boot 1064 1065# 1066# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1067# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1068# an argument if needed. Otherwise it defaults to the kernel install path 1069# 1070export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1071 1072# 1073# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1074# relocations required by build roots. This is not defined in the 1075# makefile but the argument can be passed to make if needed. 1076# 1077 1078MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1079export MODLIB 1080 1081PHONY += prepare0 1082 1083export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1084export MODORDER := $(extmod_prefix)modules.order 1085export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1086 1087ifeq ($(KBUILD_EXTMOD),) 1088core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1089core-$(CONFIG_BLOCK) += block/ 1090 1091vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1092 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1093 $(libs-y) $(libs-m))) 1094 1095vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1096 $(patsubst %/,%,$(filter %/, $(core-) \ 1097 $(drivers-) $(libs-)))) 1098 1099subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1100 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1101 $(drivers-y) $(drivers-m))) 1102 1103build-dirs := $(vmlinux-dirs) 1104clean-dirs := $(vmlinux-alldirs) 1105 1106# Externally visible symbols (used by link-vmlinux.sh) 1107KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1108KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1109ifdef CONFIG_MODULES 1110KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1111KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1112else 1113KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1114endif 1115KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1116 1117export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1118export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1119# used by scripts/Makefile.package 1120export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1121 1122vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1123 1124# Recurse until adjust_autoksyms.sh is satisfied 1125PHONY += autoksyms_recursive 1126ifdef CONFIG_TRIM_UNUSED_KSYMS 1127# For the kernel to actually contain only the needed exported symbols, 1128# we have to build modules as well to determine what those symbols are. 1129# (this can be evaluated only once include/config/auto.conf has been included) 1130KBUILD_MODULES := 1 1131 1132autoksyms_recursive: descend modules.order 1133 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1134 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1135endif 1136 1137autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1138 1139quiet_cmd_autoksyms_h = GEN $@ 1140 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1141 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1142 1143$(autoksyms_h): 1144 $(call cmd,autoksyms_h) 1145 1146ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1147 1148# Final link of vmlinux with optional arch pass after final link 1149cmd_link-vmlinux = \ 1150 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1151 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1152 1153vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1154 +$(call if_changed_dep,link-vmlinux) 1155 1156targets := vmlinux 1157 1158# The actual objects are generated when descending, 1159# make sure no implicit rule kicks in 1160$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1161 1162filechk_kernel.release = \ 1163 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1164 1165# Store (new) KERNELRELEASE string in include/config/kernel.release 1166include/config/kernel.release: FORCE 1167 $(call filechk,kernel.release) 1168 1169# Additional helpers built in scripts/ 1170# Carefully list dependencies so we do not try to build scripts twice 1171# in parallel 1172PHONY += scripts 1173scripts: scripts_basic scripts_dtc 1174 $(Q)$(MAKE) $(build)=$(@) 1175 1176# Things we need to do before we recursively start building the kernel 1177# or the modules are listed in "prepare". 1178# A multi level approach is used. prepareN is processed before prepareN-1. 1179# archprepare is used in arch Makefiles and when processed asm symlink, 1180# version.h and scripts_basic is processed / created. 1181 1182PHONY += prepare archprepare 1183 1184archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1185 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1186 include/generated/autoconf.h remove-stale-files 1187 1188prepare0: archprepare 1189 $(Q)$(MAKE) $(build)=scripts/mod 1190 $(Q)$(MAKE) $(build)=. 1191 1192# All the preparing.. 1193prepare: prepare0 1194 1195PHONY += remove-stale-files 1196remove-stale-files: 1197 $(Q)$(srctree)/scripts/remove-stale-files 1198 1199# Support for using generic headers in asm-generic 1200asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1201 1202PHONY += asm-generic uapi-asm-generic 1203asm-generic: uapi-asm-generic 1204 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1205 generic=include/asm-generic 1206uapi-asm-generic: 1207 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1208 generic=include/uapi/asm-generic 1209 1210# Generate some files 1211# --------------------------------------------------------------------------- 1212 1213# KERNELRELEASE can change from a few different places, meaning version.h 1214# needs to be updated, so this check is forced on all builds 1215 1216uts_len := 64 1217define filechk_utsrelease.h 1218 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1219 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1220 exit 1; \ 1221 fi; \ 1222 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1223endef 1224 1225define filechk_version.h 1226 if [ $(SUBLEVEL) -gt 255 ]; then \ 1227 echo \#define LINUX_VERSION_CODE $(shell \ 1228 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1229 else \ 1230 echo \#define LINUX_VERSION_CODE $(shell \ 1231 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1232 fi; \ 1233 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1234 ((c) > 255 ? 255 : (c)))'; \ 1235 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1236 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1237 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1238endef 1239 1240$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1241$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1242$(version_h): FORCE 1243 $(call filechk,version.h) 1244 1245include/generated/utsrelease.h: include/config/kernel.release FORCE 1246 $(call filechk,utsrelease.h) 1247 1248PHONY += headerdep 1249headerdep: 1250 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1251 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1252 1253# --------------------------------------------------------------------------- 1254# Kernel headers 1255 1256#Default location for installed headers 1257export INSTALL_HDR_PATH = $(objtree)/usr 1258 1259quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1260 cmd_headers_install = \ 1261 mkdir -p $(INSTALL_HDR_PATH); \ 1262 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1263 usr/include $(INSTALL_HDR_PATH) 1264 1265PHONY += headers_install 1266headers_install: headers 1267 $(call cmd,headers_install) 1268 1269PHONY += archheaders archscripts 1270 1271hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1272 1273PHONY += headers 1274headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1275 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1276 $(error Headers not exportable for the $(SRCARCH) architecture)) 1277 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1278 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1279 1280ifdef CONFIG_HEADERS_INSTALL 1281prepare: headers 1282endif 1283 1284PHONY += scripts_unifdef 1285scripts_unifdef: scripts_basic 1286 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1287 1288# --------------------------------------------------------------------------- 1289# Install 1290 1291# Many distributions have the custom install script, /sbin/installkernel. 1292# If DKMS is installed, 'make install' will eventually recuses back 1293# to the this Makefile to build and install external modules. 1294# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1295 1296install: sub_make_done := 1297 1298# --------------------------------------------------------------------------- 1299# Tools 1300 1301ifdef CONFIG_STACK_VALIDATION 1302prepare: tools/objtool 1303endif 1304 1305ifdef CONFIG_BPF 1306ifdef CONFIG_DEBUG_INFO_BTF 1307prepare: tools/bpf/resolve_btfids 1308endif 1309endif 1310 1311PHONY += resolve_btfids_clean 1312 1313resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1314 1315# tools/bpf/resolve_btfids directory might not exist 1316# in output directory, skip its clean in that case 1317resolve_btfids_clean: 1318ifneq ($(wildcard $(resolve_btfids_O)),) 1319 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1320endif 1321 1322# Clear a bunch of variables before executing the submake 1323ifeq ($(quiet),silent_) 1324tools_silent=s 1325endif 1326 1327tools/: FORCE 1328 $(Q)mkdir -p $(objtree)/tools 1329 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1330 1331tools/%: FORCE 1332 $(Q)mkdir -p $(objtree)/tools 1333 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1334 1335# --------------------------------------------------------------------------- 1336# Kernel selftest 1337 1338PHONY += kselftest 1339kselftest: 1340 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1341 1342kselftest-%: FORCE 1343 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1344 1345PHONY += kselftest-merge 1346kselftest-merge: 1347 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1348 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1349 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1350 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1351 1352# --------------------------------------------------------------------------- 1353# Devicetree files 1354 1355ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1356dtstree := arch/$(SRCARCH)/boot/dts 1357endif 1358 1359ifneq ($(dtstree),) 1360 1361%.dtb: include/config/kernel.release scripts_dtc 1362 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1363 1364%.dtbo: include/config/kernel.release scripts_dtc 1365 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1366 1367PHONY += dtbs dtbs_install dtbs_check 1368dtbs: include/config/kernel.release scripts_dtc 1369 $(Q)$(MAKE) $(build)=$(dtstree) 1370 1371ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1372export CHECK_DTBS=y 1373dtbs: dt_binding_check 1374endif 1375 1376dtbs_check: dtbs 1377 1378dtbs_install: 1379 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1380 1381ifdef CONFIG_OF_EARLY_FLATTREE 1382all: dtbs 1383endif 1384 1385endif 1386 1387PHONY += scripts_dtc 1388scripts_dtc: scripts_basic 1389 $(Q)$(MAKE) $(build)=scripts/dtc 1390 1391ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1392export CHECK_DT_BINDING=y 1393endif 1394 1395PHONY += dt_binding_check 1396dt_binding_check: scripts_dtc 1397 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1398 1399# --------------------------------------------------------------------------- 1400# Modules 1401 1402ifdef CONFIG_MODULES 1403 1404# By default, build modules as well 1405 1406all: modules 1407 1408# When we're building modules with modversions, we need to consider 1409# the built-in objects during the descend as well, in order to 1410# make sure the checksums are up to date before we record them. 1411ifdef CONFIG_MODVERSIONS 1412 KBUILD_BUILTIN := 1 1413endif 1414 1415# Build modules 1416# 1417# A module can be listed more than once in obj-m resulting in 1418# duplicate lines in modules.order files. Those are removed 1419# using awk while concatenating to the final file. 1420 1421PHONY += modules 1422modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1423 1424cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1425 1426modules.order: $(subdir-modorder) FORCE 1427 $(call if_changed,modules_order) 1428 1429targets += modules.order 1430 1431# Target to prepare building external modules 1432PHONY += modules_prepare 1433modules_prepare: prepare 1434 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1435 1436export modules_sign_only := 1437 1438ifeq ($(CONFIG_MODULE_SIG),y) 1439PHONY += modules_sign 1440modules_sign: modules_install 1441 @: 1442 1443# modules_sign is a subset of modules_install. 1444# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1445ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1446modules_sign_only := y 1447endif 1448endif 1449 1450modinst_pre := 1451ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1452modinst_pre := __modinst_pre 1453endif 1454 1455modules_install: $(modinst_pre) 1456PHONY += __modinst_pre 1457__modinst_pre: 1458 @rm -rf $(MODLIB)/kernel 1459 @rm -f $(MODLIB)/source 1460 @mkdir -p $(MODLIB)/kernel 1461 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1462 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1463 rm -f $(MODLIB)/build ; \ 1464 ln -s $(CURDIR) $(MODLIB)/build ; \ 1465 fi 1466 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1467 @cp -f modules.builtin $(MODLIB)/ 1468 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1469 1470endif # CONFIG_MODULES 1471 1472### 1473# Cleaning is done on three levels. 1474# make clean Delete most generated files 1475# Leave enough to build external modules 1476# make mrproper Delete the current configuration, and all generated files 1477# make distclean Remove editor backup files, patch leftover files and the like 1478 1479# Directories & files removed with 'make clean' 1480CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1481 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1482 compile_commands.json .thinlto-cache 1483 1484# Directories & files removed with 'make mrproper' 1485MRPROPER_FILES += include/config include/generated \ 1486 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1487 debian snap tar-install \ 1488 .config .config.old .version \ 1489 Module.symvers \ 1490 certs/signing_key.pem \ 1491 certs/x509.genkey \ 1492 vmlinux-gdb.py \ 1493 *.spec 1494 1495# clean - Delete most, but leave enough to build external modules 1496# 1497clean: rm-files := $(CLEAN_FILES) 1498 1499PHONY += archclean vmlinuxclean 1500 1501vmlinuxclean: 1502 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1503 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1504 1505clean: archclean vmlinuxclean resolve_btfids_clean 1506 1507# mrproper - Delete all generated files, including .config 1508# 1509mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1510mrproper-dirs := $(addprefix _mrproper_,scripts) 1511 1512PHONY += $(mrproper-dirs) mrproper 1513$(mrproper-dirs): 1514 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1515 1516mrproper: clean $(mrproper-dirs) 1517 $(call cmd,rmfiles) 1518 1519# distclean 1520# 1521PHONY += distclean 1522 1523distclean: mrproper 1524 @find . $(RCS_FIND_IGNORE) \ 1525 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1526 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1527 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1528 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1529 -type f -print | xargs rm -f 1530 1531 1532# Packaging of the kernel to various formats 1533# --------------------------------------------------------------------------- 1534 1535%src-pkg: FORCE 1536 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1537%pkg: include/config/kernel.release FORCE 1538 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1539 1540# Brief documentation of the typical targets used 1541# --------------------------------------------------------------------------- 1542 1543boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1544boards := $(sort $(notdir $(boards))) 1545board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1546board-dirs := $(sort $(notdir $(board-dirs:/=))) 1547 1548PHONY += help 1549help: 1550 @echo 'Cleaning targets:' 1551 @echo ' clean - Remove most generated files but keep the config and' 1552 @echo ' enough build support to build external modules' 1553 @echo ' mrproper - Remove all generated files + config + various backup files' 1554 @echo ' distclean - mrproper + remove editor backup and patch files' 1555 @echo '' 1556 @echo 'Configuration targets:' 1557 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1558 @echo '' 1559 @echo 'Other generic targets:' 1560 @echo ' all - Build all targets marked with [*]' 1561 @echo '* vmlinux - Build the bare kernel' 1562 @echo '* modules - Build all modules' 1563 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1564 @echo ' dir/ - Build all files in dir and below' 1565 @echo ' dir/file.[ois] - Build specified target only' 1566 @echo ' dir/file.ll - Build the LLVM assembly file' 1567 @echo ' (requires compiler support for LLVM assembly generation)' 1568 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1569 @echo ' (requires a recent binutils and recent build (System.map))' 1570 @echo ' dir/file.ko - Build module including final link' 1571 @echo ' modules_prepare - Set up for building external modules' 1572 @echo ' tags/TAGS - Generate tags file for editors' 1573 @echo ' cscope - Generate cscope index' 1574 @echo ' gtags - Generate GNU GLOBAL index' 1575 @echo ' kernelrelease - Output the release version string (use with make -s)' 1576 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1577 @echo ' image_name - Output the image name (use with make -s)' 1578 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1579 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1580 echo '' 1581 @echo 'Static analysers:' 1582 @echo ' checkstack - Generate a list of stack hogs' 1583 @echo ' versioncheck - Sanity check on version.h usage' 1584 @echo ' includecheck - Check for duplicate included header files' 1585 @echo ' export_report - List the usages of all exported symbols' 1586 @echo ' headerdep - Detect inclusion cycles in headers' 1587 @echo ' coccicheck - Check with Coccinelle' 1588 @echo ' clang-analyzer - Check with clang static analyzer' 1589 @echo ' clang-tidy - Check with clang-tidy' 1590 @echo '' 1591 @echo 'Tools:' 1592 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1593 @echo '' 1594 @echo 'Kernel selftest:' 1595 @echo ' kselftest - Build and run kernel selftest' 1596 @echo ' Build, install, and boot kernel before' 1597 @echo ' running kselftest on it' 1598 @echo ' Run as root for full coverage' 1599 @echo ' kselftest-all - Build kernel selftest' 1600 @echo ' kselftest-install - Build and install kernel selftest' 1601 @echo ' kselftest-clean - Remove all generated kselftest files' 1602 @echo ' kselftest-merge - Merge all the config dependencies of' 1603 @echo ' kselftest to existing .config.' 1604 @echo '' 1605 @$(if $(dtstree), \ 1606 echo 'Devicetree:'; \ 1607 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1608 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1609 echo ' dt_binding_check - Validate device tree binding documents'; \ 1610 echo ' dtbs_check - Validate device tree source files';\ 1611 echo '') 1612 1613 @echo 'Userspace tools targets:' 1614 @echo ' use "make tools/help"' 1615 @echo ' or "cd tools; make help"' 1616 @echo '' 1617 @echo 'Kernel packaging:' 1618 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1619 @echo '' 1620 @echo 'Documentation targets:' 1621 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1622 @echo '' 1623 @echo 'Architecture specific targets ($(SRCARCH)):' 1624 @$(if $(archhelp),$(archhelp),\ 1625 echo ' No architecture specific help defined for $(SRCARCH)') 1626 @echo '' 1627 @$(if $(boards), \ 1628 $(foreach b, $(boards), \ 1629 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1630 echo '') 1631 @$(if $(board-dirs), \ 1632 $(foreach b, $(board-dirs), \ 1633 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1634 printf " %-16s - Show all of the above\\n" help-boards; \ 1635 echo '') 1636 1637 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1638 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1639 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1640 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1641 @echo ' (sparse by default)' 1642 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1643 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1644 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1645 @echo ' 1: warnings which may be relevant and do not occur too often' 1646 @echo ' 2: warnings which occur quite often but may still be relevant' 1647 @echo ' 3: more obscure warnings, can most likely be ignored' 1648 @echo ' Multiple levels can be combined with W=12 or W=123' 1649 @echo '' 1650 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1651 @echo 'For further info see the ./README file' 1652 1653 1654help-board-dirs := $(addprefix help-,$(board-dirs)) 1655 1656help-boards: $(help-board-dirs) 1657 1658boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1659 1660$(help-board-dirs): help-%: 1661 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1662 @$(if $(boards-per-dir), \ 1663 $(foreach b, $(boards-per-dir), \ 1664 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1665 echo '') 1666 1667 1668# Documentation targets 1669# --------------------------------------------------------------------------- 1670DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1671 linkcheckdocs dochelp refcheckdocs 1672PHONY += $(DOC_TARGETS) 1673$(DOC_TARGETS): 1674 $(Q)$(MAKE) $(build)=Documentation $@ 1675 1676# Misc 1677# --------------------------------------------------------------------------- 1678 1679PHONY += scripts_gdb 1680scripts_gdb: prepare0 1681 $(Q)$(MAKE) $(build)=scripts/gdb 1682 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1683 1684ifdef CONFIG_GDB_SCRIPTS 1685all: scripts_gdb 1686endif 1687 1688else # KBUILD_EXTMOD 1689 1690### 1691# External module support. 1692# When building external modules the kernel used as basis is considered 1693# read-only, and no consistency checks are made and the make 1694# system is not used on the basis kernel. If updates are required 1695# in the basis kernel ordinary make commands (without M=...) must be used. 1696 1697# We are always building only modules. 1698KBUILD_BUILTIN := 1699KBUILD_MODULES := 1 1700 1701build-dirs := $(KBUILD_EXTMOD) 1702$(MODORDER): descend 1703 @: 1704 1705compile_commands.json: $(extmod_prefix)compile_commands.json 1706PHONY += compile_commands.json 1707 1708clean-dirs := $(KBUILD_EXTMOD) 1709clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1710 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1711 1712PHONY += prepare 1713# now expand this into a simple variable to reduce the cost of shell evaluations 1714prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1715prepare: 1716 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1717 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1718 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1719 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1720 fi 1721 1722PHONY += help 1723help: 1724 @echo ' Building external modules.' 1725 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1726 @echo '' 1727 @echo ' modules - default target, build the module(s)' 1728 @echo ' modules_install - install the module' 1729 @echo ' clean - remove generated files in module directory only' 1730 @echo '' 1731 1732# no-op for external module builds 1733PHONY += modules_prepare 1734 1735endif # KBUILD_EXTMOD 1736 1737# --------------------------------------------------------------------------- 1738# Modules 1739 1740PHONY += modules modules_install 1741 1742ifdef CONFIG_MODULES 1743 1744modules: modules_check 1745 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1746 1747PHONY += modules_check 1748modules_check: $(MODORDER) 1749 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1750 1751quiet_cmd_depmod = DEPMOD $(MODLIB) 1752 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1753 $(KERNELRELEASE) 1754 1755modules_install: 1756 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1757 $(call cmd,depmod) 1758 1759else # CONFIG_MODULES 1760 1761# Modules not configured 1762# --------------------------------------------------------------------------- 1763 1764modules modules_install: 1765 @echo >&2 '***' 1766 @echo >&2 '*** The present kernel configuration has modules disabled.' 1767 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1768 @echo >&2 '*** to enable CONFIG_MODULES.' 1769 @echo >&2 '***' 1770 @exit 1 1771 1772endif # CONFIG_MODULES 1773 1774# Single targets 1775# --------------------------------------------------------------------------- 1776# To build individual files in subdirectories, you can do like this: 1777# 1778# make foo/bar/baz.s 1779# 1780# The supported suffixes for single-target are listed in 'single-targets' 1781# 1782# To build only under specific subdirectories, you can do like this: 1783# 1784# make foo/bar/baz/ 1785 1786ifdef single-build 1787 1788# .ko is special because modpost is needed 1789single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1790single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1791 1792$(single-ko): single_modpost 1793 @: 1794$(single-no-ko): descend 1795 @: 1796 1797ifeq ($(KBUILD_EXTMOD),) 1798# For the single build of in-tree modules, use a temporary file to avoid 1799# the situation of modules_install installing an invalid modules.order. 1800MODORDER := .modules.tmp 1801endif 1802 1803PHONY += single_modpost 1804single_modpost: $(single-no-ko) modules_prepare 1805 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1806 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1807 1808KBUILD_MODULES := 1 1809 1810export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1811 1812# trim unrelated directories 1813build-dirs := $(foreach d, $(build-dirs), \ 1814 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1815 1816endif 1817 1818ifndef CONFIG_MODULES 1819KBUILD_MODULES := 1820endif 1821 1822# Handle descending into subdirectories listed in $(build-dirs) 1823# Preset locale variables to speed up the build process. Limit locale 1824# tweaks to this spot to avoid wrong language settings when running 1825# make menuconfig etc. 1826# Error messages still appears in the original language 1827PHONY += descend $(build-dirs) 1828descend: $(build-dirs) 1829$(build-dirs): prepare 1830 $(Q)$(MAKE) $(build)=$@ \ 1831 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1832 need-builtin=1 need-modorder=1 1833 1834clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1835PHONY += $(clean-dirs) clean 1836$(clean-dirs): 1837 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1838 1839clean: $(clean-dirs) 1840 $(call cmd,rmfiles) 1841 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1842 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1843 -o -name '*.ko.*' \ 1844 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1845 -o -name '*.dwo' -o -name '*.lst' \ 1846 -o -name '*.su' -o -name '*.mod' \ 1847 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1848 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1849 -o -name '*.asn1.[ch]' \ 1850 -o -name '*.symtypes' -o -name 'modules.order' \ 1851 -o -name '.tmp_*.o.*' \ 1852 -o -name '*.c.[012]*.*' \ 1853 -o -name '*.ll' \ 1854 -o -name '*.gcno' \ 1855 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1856 1857# Generate tags for editors 1858# --------------------------------------------------------------------------- 1859quiet_cmd_tags = GEN $@ 1860 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1861 1862tags TAGS cscope gtags: FORCE 1863 $(call cmd,tags) 1864 1865# Script to generate missing namespace dependencies 1866# --------------------------------------------------------------------------- 1867 1868PHONY += nsdeps 1869nsdeps: export KBUILD_NSDEPS=1 1870nsdeps: modules 1871 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1872 1873# Clang Tooling 1874# --------------------------------------------------------------------------- 1875 1876quiet_cmd_gen_compile_commands = GEN $@ 1877 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1878 1879$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1880 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1881 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1882 $(call if_changed,gen_compile_commands) 1883 1884targets += $(extmod_prefix)compile_commands.json 1885 1886PHONY += clang-tidy clang-analyzer 1887 1888ifdef CONFIG_CC_IS_CLANG 1889quiet_cmd_clang_tools = CHECK $< 1890 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1891 1892clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1893 $(call cmd,clang_tools) 1894else 1895clang-tidy clang-analyzer: 1896 @echo "$@ requires CC=clang" >&2 1897 @false 1898endif 1899 1900# Scripts to check various things for consistency 1901# --------------------------------------------------------------------------- 1902 1903PHONY += includecheck versioncheck coccicheck export_report 1904 1905includecheck: 1906 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1907 -name '*.[hcS]' -type f -print | sort \ 1908 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1909 1910versioncheck: 1911 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1912 -name '*.[hcS]' -type f -print | sort \ 1913 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1914 1915coccicheck: 1916 $(Q)$(BASH) $(srctree)/scripts/$@ 1917 1918export_report: 1919 $(PERL) $(srctree)/scripts/export_report.pl 1920 1921PHONY += checkstack kernelrelease kernelversion image_name 1922 1923# UML needs a little special treatment here. It wants to use the host 1924# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1925# else wants $(ARCH), including people doing cross-builds, which means 1926# that $(SUBARCH) doesn't work here. 1927ifeq ($(ARCH), um) 1928CHECKSTACK_ARCH := $(SUBARCH) 1929else 1930CHECKSTACK_ARCH := $(ARCH) 1931endif 1932checkstack: 1933 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1934 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1935 1936kernelrelease: 1937 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1938 1939kernelversion: 1940 @echo $(KERNELVERSION) 1941 1942image_name: 1943 @echo $(KBUILD_IMAGE) 1944 1945quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1946 cmd_rmfiles = rm -rf $(rm-files) 1947 1948# read saved command lines for existing targets 1949existing-targets := $(wildcard $(sort $(targets))) 1950 1951-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1952 1953endif # config-build 1954endif # mixed-build 1955endif # need-sub-make 1956 1957PHONY += FORCE 1958FORCE: 1959 1960# Declare the contents of the PHONY variable as phony. We keep that 1961# information in a variable so we can use it in if_changed and friends. 1962.PHONY: $(PHONY) 1963