1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 7 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Kleptomaniac Octopus 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 72# 73# To put more focus on warnings, be less verbose as default 74# Use 'make V=1' to see the full commands 75 76ifeq ("$(origin V)", "command line") 77 KBUILD_VERBOSE = $(V) 78endif 79ifndef KBUILD_VERBOSE 80 KBUILD_VERBOSE = 0 81endif 82 83ifeq ($(KBUILD_VERBOSE),1) 84 quiet = 85 Q = 86else 87 quiet=quiet_ 88 Q = @ 89endif 90 91# If the user is running make -s (silent mode), suppress echoing of 92# commands 93 94ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 95 quiet=silent_ 96endif 97 98export quiet Q KBUILD_VERBOSE 99 100# Kbuild will save output files in the current working directory. 101# This does not need to match to the root of the kernel source tree. 102# 103# For example, you can do this: 104# 105# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 106# 107# If you want to save output files in a different location, there are 108# two syntaxes to specify it. 109# 110# 1) O= 111# Use "make O=dir/to/store/output/files/" 112# 113# 2) Set KBUILD_OUTPUT 114# Set the environment variable KBUILD_OUTPUT to point to the output directory. 115# export KBUILD_OUTPUT=dir/to/store/output/files/; make 116# 117# The O= assignment takes precedence over the KBUILD_OUTPUT environment 118# variable. 119 120# Do we want to change the working directory? 121ifeq ("$(origin O)", "command line") 122 KBUILD_OUTPUT := $(O) 123endif 124 125ifneq ($(KBUILD_OUTPUT),) 126# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 127# expand a shell special character '~'. We use a somewhat tedious way here. 128abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 129$(if $(abs_objtree),, \ 130 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 131 132# $(realpath ...) resolves symlinks 133abs_objtree := $(realpath $(abs_objtree)) 134else 135abs_objtree := $(CURDIR) 136endif # ifneq ($(KBUILD_OUTPUT),) 137 138ifeq ($(abs_objtree),$(CURDIR)) 139# Suppress "Entering directory ..." unless we are changing the work directory. 140MAKEFLAGS += --no-print-directory 141else 142need-sub-make := 1 143endif 144 145abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 146 147ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 148$(error source directory cannot contain spaces or colons) 149endif 150 151ifneq ($(abs_srctree),$(abs_objtree)) 152# Look for make include files relative to root of kernel src 153# 154# This does not become effective immediately because MAKEFLAGS is re-parsed 155# once after the Makefile is read. We need to invoke sub-make. 156MAKEFLAGS += --include-dir=$(abs_srctree) 157need-sub-make := 1 158endif 159 160ifneq ($(filter 3.%,$(MAKE_VERSION)),) 161# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 162# We need to invoke sub-make to avoid implicit rules in the top Makefile. 163need-sub-make := 1 164# Cancel implicit rules for this Makefile. 165$(lastword $(MAKEFILE_LIST)): ; 166endif 167 168export abs_srctree abs_objtree 169export sub_make_done := 1 170 171ifeq ($(need-sub-make),1) 172 173PHONY += $(MAKECMDGOALS) sub-make 174 175$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 176 @: 177 178# Invoke a second make in the output directory, passing relevant variables 179sub-make: 180 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 181 182endif # need-sub-make 183endif # sub_make_done 184 185# We process the rest of the Makefile if this is the final invocation of make 186ifeq ($(need-sub-make),) 187 188# Do not print "Entering directory ...", 189# but we want to display it when entering to the output directory 190# so that IDEs/editors are able to understand relative filenames. 191MAKEFLAGS += --no-print-directory 192 193# Call a source code checker (by default, "sparse") as part of the 194# C compilation. 195# 196# Use 'make C=1' to enable checking of only re-compiled files. 197# Use 'make C=2' to enable checking of *all* source files, regardless 198# of whether they are re-compiled or not. 199# 200# See the file "Documentation/dev-tools/sparse.rst" for more details, 201# including where to get the "sparse" utility. 202 203ifeq ("$(origin C)", "command line") 204 KBUILD_CHECKSRC = $(C) 205endif 206ifndef KBUILD_CHECKSRC 207 KBUILD_CHECKSRC = 0 208endif 209 210# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 211# directory of external module to build. Setting M= takes precedence. 212ifeq ("$(origin M)", "command line") 213 KBUILD_EXTMOD := $(M) 214endif 215 216export KBUILD_CHECKSRC KBUILD_EXTMOD 217 218extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 219 220ifeq ($(abs_srctree),$(abs_objtree)) 221 # building in the source tree 222 srctree := . 223 building_out_of_srctree := 224else 225 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 226 # building in a subdirectory of the source tree 227 srctree := .. 228 else 229 srctree := $(abs_srctree) 230 endif 231 building_out_of_srctree := 1 232endif 233 234ifneq ($(KBUILD_ABS_SRCTREE),) 235srctree := $(abs_srctree) 236endif 237 238objtree := . 239VPATH := $(srctree) 240 241export building_out_of_srctree srctree objtree VPATH 242 243# To make sure we do not include .config for any of the *config targets 244# catch them early, and hand them over to scripts/kconfig/Makefile 245# It is allowed to specify more targets when calling make, including 246# mixing *config targets and build targets. 247# For example 'make oldconfig all'. 248# Detect when mixed targets is specified, and make a second invocation 249# of make so .config is not included in this case either (for *config). 250 251version_h := include/generated/uapi/linux/version.h 252old_version_h := include/linux/version.h 253 254clean-targets := %clean mrproper cleandocs 255no-dot-config-targets := $(clean-targets) \ 256 cscope gtags TAGS tags help% %docs check% coccicheck \ 257 $(version_h) headers headers_% archheaders archscripts \ 258 %asm-generic kernelversion %src-pkg dt_binding_check \ 259 outputmakefile 260no-sync-config-targets := $(no-dot-config-targets) install %install \ 261 kernelrelease 262single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 263 264config-build := 265mixed-build := 266need-config := 1 267may-sync-config := 1 268single-build := 269 270ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 271 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 272 need-config := 273 endif 274endif 275 276ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 277 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 278 may-sync-config := 279 endif 280endif 281 282ifneq ($(KBUILD_EXTMOD),) 283 may-sync-config := 284endif 285 286ifeq ($(KBUILD_EXTMOD),) 287 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 288 config-build := 1 289 ifneq ($(words $(MAKECMDGOALS)),1) 290 mixed-build := 1 291 endif 292 endif 293endif 294 295# We cannot build single targets and the others at the same time 296ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 297 single-build := 1 298 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 299 mixed-build := 1 300 endif 301endif 302 303# For "make -j clean all", "make -j mrproper defconfig all", etc. 304ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 305 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# install and modules_install need also be processed one by one 311ifneq ($(filter install,$(MAKECMDGOALS)),) 312 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317ifdef mixed-build 318# =========================================================================== 319# We're called with mixed targets (*config and build targets). 320# Handle them one by one. 321 322PHONY += $(MAKECMDGOALS) __build_one_by_one 323 324$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 325 @: 326 327__build_one_by_one: 328 $(Q)set -e; \ 329 for i in $(MAKECMDGOALS); do \ 330 $(MAKE) -f $(srctree)/Makefile $$i; \ 331 done 332 333else # !mixed-build 334 335include scripts/Kbuild.include 336 337# Read KERNELRELEASE from include/config/kernel.release (if it exists) 338KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 339KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 340export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 341 342include scripts/subarch.include 343 344# Cross compiling and selecting different set of gcc/bin-utils 345# --------------------------------------------------------------------------- 346# 347# When performing cross compilation for other architectures ARCH shall be set 348# to the target architecture. (See arch/* for the possibilities). 349# ARCH can be set during invocation of make: 350# make ARCH=ia64 351# Another way is to have ARCH set in the environment. 352# The default ARCH is the host where make is executed. 353 354# CROSS_COMPILE specify the prefix used for all executables used 355# during compilation. Only gcc and related bin-utils executables 356# are prefixed with $(CROSS_COMPILE). 357# CROSS_COMPILE can be set on the command line 358# make CROSS_COMPILE=ia64-linux- 359# Alternatively CROSS_COMPILE can be set in the environment. 360# Default value for CROSS_COMPILE is not to prefix executables 361# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 362ARCH ?= $(SUBARCH) 363 364# Architecture as present in compile.h 365UTS_MACHINE := $(ARCH) 366SRCARCH := $(ARCH) 367 368# Additional ARCH settings for x86 369ifeq ($(ARCH),i386) 370 SRCARCH := x86 371endif 372ifeq ($(ARCH),x86_64) 373 SRCARCH := x86 374endif 375 376# Additional ARCH settings for sparc 377ifeq ($(ARCH),sparc32) 378 SRCARCH := sparc 379endif 380ifeq ($(ARCH),sparc64) 381 SRCARCH := sparc 382endif 383 384# Additional ARCH settings for sh 385ifeq ($(ARCH),sh64) 386 SRCARCH := sh 387endif 388 389KCONFIG_CONFIG ?= .config 390export KCONFIG_CONFIG 391 392# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 393export KBUILD_DEFCONFIG := defconfig 394 395# SHELL used by kbuild 396CONFIG_SHELL := sh 397 398HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 399HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 400HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 401 402ifneq ($(LLVM),) 403HOSTCC = clang 404HOSTCXX = clang++ 405else 406HOSTCC = gcc 407HOSTCXX = g++ 408endif 409KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 410 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 411 $(HOSTCFLAGS) 412KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 413KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 414KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 415 416# Make variables (CC, etc...) 417CPP = $(CC) -E 418ifneq ($(LLVM),) 419CC = clang 420LD = ld.lld 421AR = llvm-ar 422NM = llvm-nm 423OBJCOPY = llvm-objcopy 424OBJDUMP = llvm-objdump 425READELF = llvm-readelf 426OBJSIZE = llvm-size 427STRIP = llvm-strip 428else 429CC = $(CROSS_COMPILE)gcc 430LD = $(CROSS_COMPILE)ld 431AR = $(CROSS_COMPILE)ar 432NM = $(CROSS_COMPILE)nm 433OBJCOPY = $(CROSS_COMPILE)objcopy 434OBJDUMP = $(CROSS_COMPILE)objdump 435READELF = $(CROSS_COMPILE)readelf 436OBJSIZE = $(CROSS_COMPILE)size 437STRIP = $(CROSS_COMPILE)strip 438endif 439PAHOLE = pahole 440LEX = flex 441YACC = bison 442AWK = awk 443INSTALLKERNEL := installkernel 444DEPMOD = /sbin/depmod 445PERL = perl 446PYTHON = python 447PYTHON3 = python3 448CHECK = sparse 449BASH = bash 450 451CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 452 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 453NOSTDINC_FLAGS := 454CFLAGS_MODULE = 455AFLAGS_MODULE = 456LDFLAGS_MODULE = 457CFLAGS_KERNEL = 458AFLAGS_KERNEL = 459LDFLAGS_vmlinux = 460 461# Use USERINCLUDE when you must reference the UAPI directories only. 462USERINCLUDE := \ 463 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 464 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 465 -I$(srctree)/include/uapi \ 466 -I$(objtree)/include/generated/uapi \ 467 -include $(srctree)/include/linux/kconfig.h 468 469# Use LINUXINCLUDE when you must reference the include/ directory. 470# Needed to be compatible with the O= option 471LINUXINCLUDE := \ 472 -I$(srctree)/arch/$(SRCARCH)/include \ 473 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 474 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 475 -I$(objtree)/include \ 476 $(USERINCLUDE) 477 478KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 479KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 480 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 481 -Werror=implicit-function-declaration -Werror=implicit-int \ 482 -Wno-format-security \ 483 -std=gnu89 484KBUILD_CPPFLAGS := -D__KERNEL__ 485KBUILD_AFLAGS_KERNEL := 486KBUILD_CFLAGS_KERNEL := 487KBUILD_AFLAGS_MODULE := -DMODULE 488KBUILD_CFLAGS_MODULE := -DMODULE 489KBUILD_LDFLAGS_MODULE := 490export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 491KBUILD_LDFLAGS := 492GCC_PLUGINS_CFLAGS := 493CLANG_FLAGS := 494 495export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 496export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 497export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 498export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 499 500export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 501export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 502export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 503export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 504export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 505export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 506 507# Files to ignore in find ... statements 508 509export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 510 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 511 -prune -o 512export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 513 --exclude CVS --exclude .pc --exclude .hg --exclude .git 514 515# =========================================================================== 516# Rules shared between *config targets and build targets 517 518# Basic helpers built in scripts/basic/ 519PHONY += scripts_basic 520scripts_basic: 521 $(Q)$(MAKE) $(build)=scripts/basic 522 $(Q)rm -f .tmp_quiet_recordmcount 523 524PHONY += outputmakefile 525# Before starting out-of-tree build, make sure the source tree is clean. 526# outputmakefile generates a Makefile in the output directory, if using a 527# separate output directory. This allows convenient use of make in the 528# output directory. 529# At the same time when output Makefile generated, generate .gitignore to 530# ignore whole output directory 531outputmakefile: 532ifdef building_out_of_srctree 533 $(Q)if [ -f $(srctree)/.config -o \ 534 -d $(srctree)/include/config -o \ 535 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 536 echo >&2 "***"; \ 537 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 538 echo >&2 "*** in $(abs_srctree)";\ 539 echo >&2 "***"; \ 540 false; \ 541 fi 542 $(Q)ln -fsn $(srctree) source 543 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 544 $(Q)test -e .gitignore || \ 545 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 546endif 547 548ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 549ifneq ($(CROSS_COMPILE),) 550CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 551GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 552CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 553GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 554endif 555ifneq ($(GCC_TOOLCHAIN),) 556CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 557endif 558ifneq ($(LLVM_IAS),1) 559CLANG_FLAGS += -no-integrated-as 560endif 561CLANG_FLAGS += -Werror=unknown-warning-option 562KBUILD_CFLAGS += $(CLANG_FLAGS) 563KBUILD_AFLAGS += $(CLANG_FLAGS) 564export CLANG_FLAGS 565endif 566 567# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 568# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 569# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 570# and from include/config/auto.conf.cmd to detect the compiler upgrade. 571CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 572 573ifdef config-build 574# =========================================================================== 575# *config targets only - make sure prerequisites are updated, and descend 576# in scripts/kconfig to make the *config target 577 578# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 579# KBUILD_DEFCONFIG may point out an alternative default configuration 580# used for 'make defconfig' 581include arch/$(SRCARCH)/Makefile 582export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 583 584config: outputmakefile scripts_basic FORCE 585 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 586 587%config: outputmakefile scripts_basic FORCE 588 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 589 590else #!config-build 591# =========================================================================== 592# Build targets only - this includes vmlinux, arch specific targets, clean 593# targets and others. In general all targets except *config targets. 594 595# If building an external module we do not care about the all: rule 596# but instead _all depend on modules 597PHONY += all 598ifeq ($(KBUILD_EXTMOD),) 599_all: all 600else 601_all: modules 602endif 603 604# Decide whether to build built-in, modular, or both. 605# Normally, just do built-in. 606 607KBUILD_MODULES := 608KBUILD_BUILTIN := 1 609 610# If we have only "make modules", don't compile built-in objects. 611# When we're building modules with modversions, we need to consider 612# the built-in objects during the descend as well, in order to 613# make sure the checksums are up to date before we record them. 614 615ifeq ($(MAKECMDGOALS),modules) 616 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 617endif 618 619# If we have "make <whatever> modules", compile modules 620# in addition to whatever we do anyway. 621# Just "make" or "make all" shall build modules as well 622 623ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),) 624 KBUILD_MODULES := 1 625endif 626 627ifeq ($(MAKECMDGOALS),) 628 KBUILD_MODULES := 1 629endif 630 631export KBUILD_MODULES KBUILD_BUILTIN 632 633ifdef need-config 634include include/config/auto.conf 635endif 636 637ifeq ($(KBUILD_EXTMOD),) 638# Objects we will link into vmlinux / subdirs we need to visit 639init-y := init/ 640drivers-y := drivers/ sound/ 641drivers-$(CONFIG_SAMPLES) += samples/ 642net-y := net/ 643libs-y := lib/ 644core-y := usr/ 645virt-y := virt/ 646endif # KBUILD_EXTMOD 647 648# The all: target is the default when no target is given on the 649# command line. 650# This allow a user to issue only 'make' to build a kernel including modules 651# Defaults to vmlinux, but the arch makefile usually adds further targets 652all: vmlinux 653 654CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 655 $(call cc-option,-fno-tree-loop-im) \ 656 $(call cc-disable-warning,maybe-uninitialized,) 657export CFLAGS_GCOV 658 659# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 660ifdef CONFIG_FUNCTION_TRACER 661 CC_FLAGS_FTRACE := -pg 662endif 663 664RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 665RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 666RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 667RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 668RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 669RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 670export RETPOLINE_CFLAGS 671export RETPOLINE_VDSO_CFLAGS 672 673include arch/$(SRCARCH)/Makefile 674 675ifdef need-config 676ifdef may-sync-config 677# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 678# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 679# because some architectures define CROSS_COMPILE there. 680include include/config/auto.conf.cmd 681 682$(KCONFIG_CONFIG): 683 @echo >&2 '***' 684 @echo >&2 '*** Configuration file "$@" not found!' 685 @echo >&2 '***' 686 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 687 @echo >&2 '*** "make menuconfig" or "make xconfig").' 688 @echo >&2 '***' 689 @/bin/false 690 691# The actual configuration files used during the build are stored in 692# include/generated/ and include/config/. Update them if .config is newer than 693# include/config/auto.conf (which mirrors .config). 694# 695# This exploits the 'multi-target pattern rule' trick. 696# The syncconfig should be executed only once to make all the targets. 697# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 698%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG) 699 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 700else # !may-sync-config 701# External modules and some install targets need include/generated/autoconf.h 702# and include/config/auto.conf but do not care if they are up-to-date. 703# Use auto.conf to trigger the test 704PHONY += include/config/auto.conf 705 706include/config/auto.conf: 707 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 708 echo >&2; \ 709 echo >&2 " ERROR: Kernel configuration is invalid."; \ 710 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 711 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 712 echo >&2 ; \ 713 /bin/false) 714 715endif # may-sync-config 716endif # need-config 717 718KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 719KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 720KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 721KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 722KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 723 724ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 725KBUILD_CFLAGS += -O2 726else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 727KBUILD_CFLAGS += -O3 728else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 729KBUILD_CFLAGS += -Os 730endif 731 732# Tell gcc to never replace conditional load with a non-conditional one 733KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 734KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 735 736include scripts/Makefile.kcov 737include scripts/Makefile.gcc-plugins 738 739ifdef CONFIG_READABLE_ASM 740# Disable optimizations that make assembler listings hard to read. 741# reorder blocks reorders the control in the function 742# ipa clone creates specialized cloned functions 743# partial inlining inlines only parts of functions 744KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 745 $(call cc-option,-fno-ipa-cp-clone,) \ 746 $(call cc-option,-fno-partial-inlining) 747endif 748 749ifneq ($(CONFIG_FRAME_WARN),0) 750KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 751endif 752 753stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 754stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 755stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 756 757KBUILD_CFLAGS += $(stackp-flags-y) 758 759ifdef CONFIG_CC_IS_CLANG 760KBUILD_CPPFLAGS += -Qunused-arguments 761KBUILD_CFLAGS += -Wno-format-invalid-specifier 762KBUILD_CFLAGS += -Wno-gnu 763# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 764# source of a reference will be _MergedGlobals and not on of the whitelisted names. 765# See modpost pattern 2 766KBUILD_CFLAGS += -mno-global-merge 767else 768 769# These warnings generated too much noise in a regular build. 770# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 771KBUILD_CFLAGS += -Wno-unused-but-set-variable 772 773# Warn about unmarked fall-throughs in switch statement. 774# Disabled for clang while comment to attribute conversion happens and 775# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 776KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 777endif 778 779KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 780ifdef CONFIG_FRAME_POINTER 781KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 782else 783# Some targets (ARM with Thumb2, for example), can't be built with frame 784# pointers. For those, we don't have FUNCTION_TRACER automatically 785# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 786# incompatible with -fomit-frame-pointer with current GCC, so we don't use 787# -fomit-frame-pointer with FUNCTION_TRACER. 788ifndef CONFIG_FUNCTION_TRACER 789KBUILD_CFLAGS += -fomit-frame-pointer 790endif 791endif 792 793# Initialize all stack variables with a pattern, if desired. 794ifdef CONFIG_INIT_STACK_ALL 795KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 796endif 797 798DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 799 800ifdef CONFIG_DEBUG_INFO 801ifdef CONFIG_DEBUG_INFO_SPLIT 802DEBUG_CFLAGS += -gsplit-dwarf 803else 804DEBUG_CFLAGS += -g 805endif 806KBUILD_AFLAGS += -Wa,-gdwarf-2 807endif 808ifdef CONFIG_DEBUG_INFO_DWARF4 809DEBUG_CFLAGS += -gdwarf-4 810endif 811 812ifdef CONFIG_DEBUG_INFO_REDUCED 813DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 814 $(call cc-option,-fno-var-tracking) 815endif 816 817KBUILD_CFLAGS += $(DEBUG_CFLAGS) 818export DEBUG_CFLAGS 819 820ifdef CONFIG_FUNCTION_TRACER 821ifdef CONFIG_FTRACE_MCOUNT_RECORD 822 # gcc 5 supports generating the mcount tables directly 823 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 824 CC_FLAGS_FTRACE += -mrecord-mcount 825 export CC_USING_RECORD_MCOUNT := 1 826 endif 827 ifdef CONFIG_HAVE_NOP_MCOUNT 828 ifeq ($(call cc-option-yn, -mnop-mcount),y) 829 CC_FLAGS_FTRACE += -mnop-mcount 830 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 831 endif 832 endif 833endif 834ifdef CONFIG_HAVE_FENTRY 835 ifeq ($(call cc-option-yn, -mfentry),y) 836 CC_FLAGS_FTRACE += -mfentry 837 CC_FLAGS_USING += -DCC_USING_FENTRY 838 endif 839endif 840export CC_FLAGS_FTRACE 841KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 842KBUILD_AFLAGS += $(CC_FLAGS_USING) 843ifdef CONFIG_DYNAMIC_FTRACE 844 ifdef CONFIG_HAVE_C_RECORDMCOUNT 845 BUILD_C_RECORDMCOUNT := y 846 export BUILD_C_RECORDMCOUNT 847 endif 848endif 849endif 850 851# We trigger additional mismatches with less inlining 852ifdef CONFIG_DEBUG_SECTION_MISMATCH 853KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 854endif 855 856ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 857KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 858LDFLAGS_vmlinux += --gc-sections 859endif 860 861ifdef CONFIG_LIVEPATCH 862KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 863endif 864 865ifdef CONFIG_SHADOW_CALL_STACK 866CC_FLAGS_SCS := -fsanitize=shadow-call-stack 867KBUILD_CFLAGS += $(CC_FLAGS_SCS) 868export CC_FLAGS_SCS 869endif 870 871# arch Makefile may override CC so keep this after arch Makefile is included 872NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 873 874# warn about C99 declaration after statement 875KBUILD_CFLAGS += -Wdeclaration-after-statement 876 877# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 878KBUILD_CFLAGS += -Wvla 879 880# disable pointer signed / unsigned warnings in gcc 4.0 881KBUILD_CFLAGS += -Wno-pointer-sign 882 883# disable stringop warnings in gcc 8+ 884KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 885 886# We'll want to enable this eventually, but it's not going away for 5.7 at least 887KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 888KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 889KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 890 891# Another good warning that we'll want to enable eventually 892KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 893 894# Enabled with W=2, disabled by default as noisy 895KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 896 897# disable invalid "can't wrap" optimizations for signed / pointers 898KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 899 900# clang sets -fmerge-all-constants by default as optimization, but this 901# is non-conforming behavior for C and in fact breaks the kernel, so we 902# need to disable it here generally. 903KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 904 905# for gcc -fno-merge-all-constants disables everything, but it is fine 906# to have actual conforming behavior enabled. 907KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 908 909# Make sure -fstack-check isn't enabled (like gentoo apparently did) 910KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 911 912# conserve stack if available 913KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 914 915# Prohibit date/time macros, which would make the build non-deterministic 916KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 917 918# enforce correct pointer usage 919KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 920 921# Require designated initializers for all marked structures 922KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 923 924# change __FILE__ to the relative path from the srctree 925KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 926 927# ensure -fcf-protection is disabled when using retpoline as it is 928# incompatible with -mindirect-branch=thunk-extern 929ifdef CONFIG_RETPOLINE 930KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 931endif 932 933include scripts/Makefile.kasan 934include scripts/Makefile.extrawarn 935include scripts/Makefile.ubsan 936 937# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 938KBUILD_CPPFLAGS += $(KCPPFLAGS) 939KBUILD_AFLAGS += $(KAFLAGS) 940KBUILD_CFLAGS += $(KCFLAGS) 941 942KBUILD_LDFLAGS_MODULE += --build-id 943LDFLAGS_vmlinux += --build-id 944 945ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 946LDFLAGS_vmlinux += $(call ld-option, -X,) 947endif 948 949ifeq ($(CONFIG_RELR),y) 950LDFLAGS_vmlinux += --pack-dyn-relocs=relr 951endif 952 953# make the checker run with the right architecture 954CHECKFLAGS += --arch=$(ARCH) 955 956# insure the checker run with the right endianness 957CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 958 959# the checker needs the correct machine size 960CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 961 962# Default kernel image to build when no specific target is given. 963# KBUILD_IMAGE may be overruled on the command line or 964# set in the environment 965# Also any assignments in arch/$(ARCH)/Makefile take precedence over 966# this default value 967export KBUILD_IMAGE ?= vmlinux 968 969# 970# INSTALL_PATH specifies where to place the updated kernel and system map 971# images. Default is /boot, but you can set it to other values 972export INSTALL_PATH ?= /boot 973 974# 975# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 976# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 977# an argument if needed. Otherwise it defaults to the kernel install path 978# 979export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 980 981# 982# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 983# relocations required by build roots. This is not defined in the 984# makefile but the argument can be passed to make if needed. 985# 986 987MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 988export MODLIB 989 990# 991# INSTALL_MOD_STRIP, if defined, will cause modules to be 992# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 993# the default option --strip-debug will be used. Otherwise, 994# INSTALL_MOD_STRIP value will be used as the options to the strip command. 995 996ifdef INSTALL_MOD_STRIP 997ifeq ($(INSTALL_MOD_STRIP),1) 998mod_strip_cmd = $(STRIP) --strip-debug 999else 1000mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1001endif # INSTALL_MOD_STRIP=1 1002else 1003mod_strip_cmd = true 1004endif # INSTALL_MOD_STRIP 1005export mod_strip_cmd 1006 1007# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1008# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1009# or CONFIG_MODULE_COMPRESS_XZ. 1010 1011mod_compress_cmd = true 1012ifdef CONFIG_MODULE_COMPRESS 1013 ifdef CONFIG_MODULE_COMPRESS_GZIP 1014 mod_compress_cmd = gzip -n -f 1015 endif # CONFIG_MODULE_COMPRESS_GZIP 1016 ifdef CONFIG_MODULE_COMPRESS_XZ 1017 mod_compress_cmd = xz -f 1018 endif # CONFIG_MODULE_COMPRESS_XZ 1019endif # CONFIG_MODULE_COMPRESS 1020export mod_compress_cmd 1021 1022ifdef CONFIG_MODULE_SIG_ALL 1023$(eval $(call config_filename,MODULE_SIG_KEY)) 1024 1025mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1026else 1027mod_sign_cmd = true 1028endif 1029export mod_sign_cmd 1030 1031HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1032 1033ifdef CONFIG_STACK_VALIDATION 1034 has_libelf := $(call try-run,\ 1035 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1036 ifeq ($(has_libelf),1) 1037 objtool_target := tools/objtool FORCE 1038 else 1039 SKIP_STACK_VALIDATION := 1 1040 export SKIP_STACK_VALIDATION 1041 endif 1042endif 1043 1044PHONY += prepare0 1045 1046export MODORDER := $(extmod-prefix)modules.order 1047export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1048 1049ifeq ($(KBUILD_EXTMOD),) 1050core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1051 1052vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1053 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1054 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1055 1056vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1057 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1058 $(drivers-) $(net-) $(libs-) $(virt-)))) 1059 1060build-dirs := $(vmlinux-dirs) 1061clean-dirs := $(vmlinux-alldirs) 1062 1063init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1064core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1065drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1066net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1067libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y))) 1068ifdef CONFIG_MODULES 1069libs-y1 := $(filter-out %/, $(libs-y)) 1070libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1071else 1072libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1073endif 1074virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1075 1076# Externally visible symbols (used by link-vmlinux.sh) 1077export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1078 $(drivers-y) $(net-y) $(virt-y) 1079export KBUILD_VMLINUX_LIBS := $(libs-y1) 1080export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1081export LDFLAGS_vmlinux 1082# used by scripts/Makefile.package 1083export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1084 1085vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1086 1087# Recurse until adjust_autoksyms.sh is satisfied 1088PHONY += autoksyms_recursive 1089ifdef CONFIG_TRIM_UNUSED_KSYMS 1090autoksyms_recursive: descend modules.order 1091 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1092 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1093endif 1094 1095# For the kernel to actually contain only the needed exported symbols, 1096# we have to build modules as well to determine what those symbols are. 1097# (this can be evaluated only once include/config/auto.conf has been included) 1098ifdef CONFIG_TRIM_UNUSED_KSYMS 1099 KBUILD_MODULES := 1 1100endif 1101 1102autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1103 1104quiet_cmd_autoksyms_h = GEN $@ 1105 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1106 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1107 1108$(autoksyms_h): 1109 $(call cmd,autoksyms_h) 1110 1111ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1112 1113# Final link of vmlinux with optional arch pass after final link 1114cmd_link-vmlinux = \ 1115 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1116 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1117 1118vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1119 +$(call if_changed,link-vmlinux) 1120 1121targets := vmlinux 1122 1123# The actual objects are generated when descending, 1124# make sure no implicit rule kicks in 1125$(sort $(vmlinux-deps)): descend ; 1126 1127filechk_kernel.release = \ 1128 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1129 1130# Store (new) KERNELRELEASE string in include/config/kernel.release 1131include/config/kernel.release: FORCE 1132 $(call filechk,kernel.release) 1133 1134# Additional helpers built in scripts/ 1135# Carefully list dependencies so we do not try to build scripts twice 1136# in parallel 1137PHONY += scripts 1138scripts: scripts_basic scripts_dtc 1139 $(Q)$(MAKE) $(build)=$(@) 1140 1141# Things we need to do before we recursively start building the kernel 1142# or the modules are listed in "prepare". 1143# A multi level approach is used. prepareN is processed before prepareN-1. 1144# archprepare is used in arch Makefiles and when processed asm symlink, 1145# version.h and scripts_basic is processed / created. 1146 1147PHONY += prepare archprepare 1148 1149archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1150 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1151 1152prepare0: archprepare 1153 $(Q)$(MAKE) $(build)=scripts/mod 1154 $(Q)$(MAKE) $(build)=. 1155 1156# All the preparing.. 1157prepare: prepare0 prepare-objtool 1158 1159# Support for using generic headers in asm-generic 1160asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1161 1162PHONY += asm-generic uapi-asm-generic 1163asm-generic: uapi-asm-generic 1164 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1165 generic=include/asm-generic 1166uapi-asm-generic: 1167 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1168 generic=include/uapi/asm-generic 1169 1170PHONY += prepare-objtool 1171prepare-objtool: $(objtool_target) 1172ifeq ($(SKIP_STACK_VALIDATION),1) 1173ifdef CONFIG_UNWINDER_ORC 1174 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1175 @false 1176else 1177 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1178endif 1179endif 1180 1181# Generate some files 1182# --------------------------------------------------------------------------- 1183 1184# KERNELRELEASE can change from a few different places, meaning version.h 1185# needs to be updated, so this check is forced on all builds 1186 1187uts_len := 64 1188define filechk_utsrelease.h 1189 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1190 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1191 exit 1; \ 1192 fi; \ 1193 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1194endef 1195 1196define filechk_version.h 1197 echo \#define LINUX_VERSION_CODE $(shell \ 1198 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1199 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1200endef 1201 1202$(version_h): FORCE 1203 $(call filechk,version.h) 1204 $(Q)rm -f $(old_version_h) 1205 1206include/generated/utsrelease.h: include/config/kernel.release FORCE 1207 $(call filechk,utsrelease.h) 1208 1209PHONY += headerdep 1210headerdep: 1211 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1212 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1213 1214# --------------------------------------------------------------------------- 1215# Kernel headers 1216 1217#Default location for installed headers 1218export INSTALL_HDR_PATH = $(objtree)/usr 1219 1220quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1221 cmd_headers_install = \ 1222 mkdir -p $(INSTALL_HDR_PATH); \ 1223 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1224 usr/include $(INSTALL_HDR_PATH) 1225 1226PHONY += headers_install 1227headers_install: headers 1228 $(call cmd,headers_install) 1229 1230PHONY += archheaders archscripts 1231 1232hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1233 1234PHONY += headers 1235headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1236 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1237 $(error Headers not exportable for the $(SRCARCH) architecture)) 1238 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1239 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1240 1241# Deprecated. It is no-op now. 1242PHONY += headers_check 1243headers_check: 1244 @: 1245 1246ifdef CONFIG_HEADERS_INSTALL 1247prepare: headers 1248endif 1249 1250PHONY += scripts_unifdef 1251scripts_unifdef: scripts_basic 1252 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1253 1254# --------------------------------------------------------------------------- 1255# Kernel selftest 1256 1257PHONY += kselftest 1258kselftest: 1259 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1260 1261kselftest-%: FORCE 1262 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1263 1264PHONY += kselftest-merge 1265kselftest-merge: 1266 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1267 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1268 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1269 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1270 1271# --------------------------------------------------------------------------- 1272# Devicetree files 1273 1274ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1275dtstree := arch/$(SRCARCH)/boot/dts 1276endif 1277 1278ifneq ($(dtstree),) 1279 1280%.dtb: include/config/kernel.release scripts_dtc 1281 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1282 1283PHONY += dtbs dtbs_install dtbs_check 1284dtbs: include/config/kernel.release scripts_dtc 1285 $(Q)$(MAKE) $(build)=$(dtstree) 1286 1287ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1288export CHECK_DTBS=y 1289dtbs: dt_binding_check 1290endif 1291 1292dtbs_check: dtbs 1293 1294dtbs_install: 1295 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1296 1297ifdef CONFIG_OF_EARLY_FLATTREE 1298all: dtbs 1299endif 1300 1301endif 1302 1303PHONY += scripts_dtc 1304scripts_dtc: scripts_basic 1305 $(Q)$(MAKE) $(build)=scripts/dtc 1306 1307ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1308export CHECK_DT_BINDING=y 1309endif 1310 1311PHONY += dt_binding_check 1312dt_binding_check: scripts_dtc 1313 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1314 1315# --------------------------------------------------------------------------- 1316# Modules 1317 1318ifdef CONFIG_MODULES 1319 1320# By default, build modules as well 1321 1322all: modules 1323 1324# Build modules 1325# 1326# A module can be listed more than once in obj-m resulting in 1327# duplicate lines in modules.order files. Those are removed 1328# using awk while concatenating to the final file. 1329 1330PHONY += modules 1331modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order 1332 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1333 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1334 1335modules.order: descend 1336 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1337 1338# Target to prepare building external modules 1339PHONY += modules_prepare 1340modules_prepare: prepare 1341 1342# Target to install modules 1343PHONY += modules_install 1344modules_install: _modinst_ _modinst_post 1345 1346PHONY += _modinst_ 1347_modinst_: 1348 @rm -rf $(MODLIB)/kernel 1349 @rm -f $(MODLIB)/source 1350 @mkdir -p $(MODLIB)/kernel 1351 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1352 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1353 rm -f $(MODLIB)/build ; \ 1354 ln -s $(CURDIR) $(MODLIB)/build ; \ 1355 fi 1356 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1357 @cp -f modules.builtin $(MODLIB)/ 1358 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1359 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1360 1361# This depmod is only for convenience to give the initial 1362# boot a modules.dep even before / is mounted read-write. However the 1363# boot script depmod is the master version. 1364PHONY += _modinst_post 1365_modinst_post: _modinst_ 1366 $(call cmd,depmod) 1367 1368ifeq ($(CONFIG_MODULE_SIG), y) 1369PHONY += modules_sign 1370modules_sign: 1371 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1372endif 1373 1374else # CONFIG_MODULES 1375 1376# Modules not configured 1377# --------------------------------------------------------------------------- 1378 1379PHONY += modules modules_install 1380modules modules_install: 1381 @echo >&2 1382 @echo >&2 "The present kernel configuration has modules disabled." 1383 @echo >&2 "Type 'make config' and enable loadable module support." 1384 @echo >&2 "Then build a kernel with module support enabled." 1385 @echo >&2 1386 @exit 1 1387 1388endif # CONFIG_MODULES 1389 1390### 1391# Cleaning is done on three levels. 1392# make clean Delete most generated files 1393# Leave enough to build external modules 1394# make mrproper Delete the current configuration, and all generated files 1395# make distclean Remove editor backup files, patch leftover files and the like 1396 1397# Directories & files removed with 'make clean' 1398CLEAN_DIRS += include/ksym 1399CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps 1400 1401# Directories & files removed with 'make mrproper' 1402MRPROPER_DIRS += include/config include/generated \ 1403 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1404 debian/ snap/ tar-install/ 1405MRPROPER_FILES += .config .config.old .version \ 1406 Module.symvers \ 1407 signing_key.pem signing_key.priv signing_key.x509 \ 1408 x509.genkey extra_certificates signing_key.x509.keyid \ 1409 signing_key.x509.signer vmlinux-gdb.py \ 1410 *.spec 1411 1412# Directories & files removed with 'make distclean' 1413DISTCLEAN_DIRS += 1414DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1415 1416# clean - Delete most, but leave enough to build external modules 1417# 1418clean: rm-dirs := $(CLEAN_DIRS) 1419clean: rm-files := $(CLEAN_FILES) 1420 1421PHONY += archclean vmlinuxclean 1422 1423vmlinuxclean: 1424 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1425 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1426 1427clean: archclean vmlinuxclean 1428 1429# mrproper - Delete all generated files, including .config 1430# 1431mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1432mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1433mrproper-dirs := $(addprefix _mrproper_,scripts) 1434 1435PHONY += $(mrproper-dirs) mrproper 1436$(mrproper-dirs): 1437 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1438 1439mrproper: clean $(mrproper-dirs) 1440 $(call cmd,rmdirs) 1441 $(call cmd,rmfiles) 1442 1443# distclean 1444# 1445distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1446distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1447 1448PHONY += distclean 1449 1450distclean: mrproper 1451 $(call cmd,rmdirs) 1452 $(call cmd,rmfiles) 1453 @find $(srctree) $(RCS_FIND_IGNORE) \ 1454 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1455 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1456 -o -name 'core' \) \ 1457 -type f -print | xargs rm -f 1458 1459 1460# Packaging of the kernel to various formats 1461# --------------------------------------------------------------------------- 1462 1463%src-pkg: FORCE 1464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1465%pkg: include/config/kernel.release FORCE 1466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1467 1468# Brief documentation of the typical targets used 1469# --------------------------------------------------------------------------- 1470 1471boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1472boards := $(sort $(notdir $(boards))) 1473board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1474board-dirs := $(sort $(notdir $(board-dirs:/=))) 1475 1476PHONY += help 1477help: 1478 @echo 'Cleaning targets:' 1479 @echo ' clean - Remove most generated files but keep the config and' 1480 @echo ' enough build support to build external modules' 1481 @echo ' mrproper - Remove all generated files + config + various backup files' 1482 @echo ' distclean - mrproper + remove editor backup and patch files' 1483 @echo '' 1484 @echo 'Configuration targets:' 1485 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1486 @echo '' 1487 @echo 'Other generic targets:' 1488 @echo ' all - Build all targets marked with [*]' 1489 @echo '* vmlinux - Build the bare kernel' 1490 @echo '* modules - Build all modules' 1491 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1492 @echo ' dir/ - Build all files in dir and below' 1493 @echo ' dir/file.[ois] - Build specified target only' 1494 @echo ' dir/file.ll - Build the LLVM assembly file' 1495 @echo ' (requires compiler support for LLVM assembly generation)' 1496 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1497 @echo ' (requires a recent binutils and recent build (System.map))' 1498 @echo ' dir/file.ko - Build module including final link' 1499 @echo ' modules_prepare - Set up for building external modules' 1500 @echo ' tags/TAGS - Generate tags file for editors' 1501 @echo ' cscope - Generate cscope index' 1502 @echo ' gtags - Generate GNU GLOBAL index' 1503 @echo ' kernelrelease - Output the release version string (use with make -s)' 1504 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1505 @echo ' image_name - Output the image name (use with make -s)' 1506 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1507 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1508 echo '' 1509 @echo 'Static analysers:' 1510 @echo ' checkstack - Generate a list of stack hogs' 1511 @echo ' namespacecheck - Name space analysis on compiled kernel' 1512 @echo ' versioncheck - Sanity check on version.h usage' 1513 @echo ' includecheck - Check for duplicate included header files' 1514 @echo ' export_report - List the usages of all exported symbols' 1515 @echo ' headerdep - Detect inclusion cycles in headers' 1516 @echo ' coccicheck - Check with Coccinelle' 1517 @echo '' 1518 @echo 'Tools:' 1519 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1520 @echo '' 1521 @echo 'Kernel selftest:' 1522 @echo ' kselftest - Build and run kernel selftest' 1523 @echo ' Build, install, and boot kernel before' 1524 @echo ' running kselftest on it' 1525 @echo ' Run as root for full coverage' 1526 @echo ' kselftest-all - Build kernel selftest' 1527 @echo ' kselftest-install - Build and install kernel selftest' 1528 @echo ' kselftest-clean - Remove all generated kselftest files' 1529 @echo ' kselftest-merge - Merge all the config dependencies of' 1530 @echo ' kselftest to existing .config.' 1531 @echo '' 1532 @$(if $(dtstree), \ 1533 echo 'Devicetree:'; \ 1534 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1535 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1536 echo ' dt_binding_check - Validate device tree binding documents'; \ 1537 echo ' dtbs_check - Validate device tree source files';\ 1538 echo '') 1539 1540 @echo 'Userspace tools targets:' 1541 @echo ' use "make tools/help"' 1542 @echo ' or "cd tools; make help"' 1543 @echo '' 1544 @echo 'Kernel packaging:' 1545 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1546 @echo '' 1547 @echo 'Documentation targets:' 1548 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1549 @echo '' 1550 @echo 'Architecture specific targets ($(SRCARCH)):' 1551 @$(if $(archhelp),$(archhelp),\ 1552 echo ' No architecture specific help defined for $(SRCARCH)') 1553 @echo '' 1554 @$(if $(boards), \ 1555 $(foreach b, $(boards), \ 1556 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1557 echo '') 1558 @$(if $(board-dirs), \ 1559 $(foreach b, $(board-dirs), \ 1560 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1561 printf " %-16s - Show all of the above\\n" help-boards; \ 1562 echo '') 1563 1564 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1565 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1566 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1567 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1568 @echo ' (sparse by default)' 1569 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1570 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1571 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1572 @echo ' 1: warnings which may be relevant and do not occur too often' 1573 @echo ' 2: warnings which occur quite often but may still be relevant' 1574 @echo ' 3: more obscure warnings, can most likely be ignored' 1575 @echo ' Multiple levels can be combined with W=12 or W=123' 1576 @echo '' 1577 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1578 @echo 'For further info see the ./README file' 1579 1580 1581help-board-dirs := $(addprefix help-,$(board-dirs)) 1582 1583help-boards: $(help-board-dirs) 1584 1585boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1586 1587$(help-board-dirs): help-%: 1588 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1589 @$(if $(boards-per-dir), \ 1590 $(foreach b, $(boards-per-dir), \ 1591 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1592 echo '') 1593 1594 1595# Documentation targets 1596# --------------------------------------------------------------------------- 1597DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1598 linkcheckdocs dochelp refcheckdocs 1599PHONY += $(DOC_TARGETS) 1600$(DOC_TARGETS): 1601 $(Q)$(MAKE) $(build)=Documentation $@ 1602 1603# Misc 1604# --------------------------------------------------------------------------- 1605 1606PHONY += scripts_gdb 1607scripts_gdb: prepare0 1608 $(Q)$(MAKE) $(build)=scripts/gdb 1609 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1610 1611ifdef CONFIG_GDB_SCRIPTS 1612all: scripts_gdb 1613endif 1614 1615else # KBUILD_EXTMOD 1616 1617### 1618# External module support. 1619# When building external modules the kernel used as basis is considered 1620# read-only, and no consistency checks are made and the make 1621# system is not used on the basis kernel. If updates are required 1622# in the basis kernel ordinary make commands (without M=...) must 1623# be used. 1624# 1625# The following are the only valid targets when building external 1626# modules. 1627# make M=dir clean Delete all automatically generated files 1628# make M=dir modules Make all modules in specified dir 1629# make M=dir Same as 'make M=dir modules' 1630# make M=dir modules_install 1631# Install the modules built in the module directory 1632# Assumes install directory is already created 1633 1634# We are always building modules 1635KBUILD_MODULES := 1 1636 1637PHONY += $(objtree)/Module.symvers 1638$(objtree)/Module.symvers: 1639 @test -e $(objtree)/Module.symvers || ( \ 1640 echo; \ 1641 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1642 echo " is missing; modules will have no dependencies and modversions."; \ 1643 echo ) 1644 1645build-dirs := $(KBUILD_EXTMOD) 1646PHONY += modules 1647modules: descend $(objtree)/Module.symvers 1648 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1649 1650PHONY += modules_install 1651modules_install: _emodinst_ _emodinst_post 1652 1653install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1654PHONY += _emodinst_ 1655_emodinst_: 1656 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1657 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1658 1659PHONY += _emodinst_post 1660_emodinst_post: _emodinst_ 1661 $(call cmd,depmod) 1662 1663clean-dirs := $(KBUILD_EXTMOD) 1664clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1665 1666PHONY += / 1667/: 1668 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.' 1669 1670PHONY += help 1671help: 1672 @echo ' Building external modules.' 1673 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1674 @echo '' 1675 @echo ' modules - default target, build the module(s)' 1676 @echo ' modules_install - install the module' 1677 @echo ' clean - remove generated files in module directory only' 1678 @echo '' 1679 1680PHONY += prepare 1681endif # KBUILD_EXTMOD 1682 1683# Single targets 1684# --------------------------------------------------------------------------- 1685# To build individual files in subdirectories, you can do like this: 1686# 1687# make foo/bar/baz.s 1688# 1689# The supported suffixes for single-target are listed in 'single-targets' 1690# 1691# To build only under specific subdirectories, you can do like this: 1692# 1693# make foo/bar/baz/ 1694 1695ifdef single-build 1696 1697# .ko is special because modpost is needed 1698single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1699single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1700 1701$(single-ko): single_modpost 1702 @: 1703$(single-no-ko): descend 1704 @: 1705 1706ifeq ($(KBUILD_EXTMOD),) 1707# For the single build of in-tree modules, use a temporary file to avoid 1708# the situation of modules_install installing an invalid modules.order. 1709MODORDER := .modules.tmp 1710endif 1711 1712PHONY += single_modpost 1713single_modpost: $(single-no-ko) 1714 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1715 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1716 1717KBUILD_MODULES := 1 1718 1719export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1720 1721# trim unrelated directories 1722build-dirs := $(foreach d, $(build-dirs), \ 1723 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1724 1725endif 1726 1727# Handle descending into subdirectories listed in $(build-dirs) 1728# Preset locale variables to speed up the build process. Limit locale 1729# tweaks to this spot to avoid wrong language settings when running 1730# make menuconfig etc. 1731# Error messages still appears in the original language 1732PHONY += descend $(build-dirs) 1733descend: $(build-dirs) 1734$(build-dirs): prepare 1735 $(Q)$(MAKE) $(build)=$@ \ 1736 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \ 1737 need-builtin=1 need-modorder=1 1738 1739clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1740PHONY += $(clean-dirs) clean 1741$(clean-dirs): 1742 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1743 1744clean: $(clean-dirs) 1745 $(call cmd,rmdirs) 1746 $(call cmd,rmfiles) 1747 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1748 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1749 -o -name '*.ko.*' \ 1750 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1751 -o -name '*.dwo' -o -name '*.lst' \ 1752 -o -name '*.su' -o -name '*.mod' \ 1753 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1754 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1755 -o -name '*.asn1.[ch]' \ 1756 -o -name '*.symtypes' -o -name 'modules.order' \ 1757 -o -name '.tmp_*.o.*' \ 1758 -o -name '*.c.[012]*.*' \ 1759 -o -name '*.ll' \ 1760 -o -name '*.gcno' \) -type f -print | xargs rm -f 1761 1762# Generate tags for editors 1763# --------------------------------------------------------------------------- 1764quiet_cmd_tags = GEN $@ 1765 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1766 1767tags TAGS cscope gtags: FORCE 1768 $(call cmd,tags) 1769 1770# Script to generate missing namespace dependencies 1771# --------------------------------------------------------------------------- 1772 1773PHONY += nsdeps 1774nsdeps: export KBUILD_NSDEPS=1 1775nsdeps: modules 1776 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1777 1778# Scripts to check various things for consistency 1779# --------------------------------------------------------------------------- 1780 1781PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1782 1783includecheck: 1784 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1785 -name '*.[hcS]' -type f -print | sort \ 1786 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1787 1788versioncheck: 1789 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1790 -name '*.[hcS]' -type f -print | sort \ 1791 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1792 1793coccicheck: 1794 $(Q)$(BASH) $(srctree)/scripts/$@ 1795 1796namespacecheck: 1797 $(PERL) $(srctree)/scripts/namespace.pl 1798 1799export_report: 1800 $(PERL) $(srctree)/scripts/export_report.pl 1801 1802PHONY += checkstack kernelrelease kernelversion image_name 1803 1804# UML needs a little special treatment here. It wants to use the host 1805# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1806# else wants $(ARCH), including people doing cross-builds, which means 1807# that $(SUBARCH) doesn't work here. 1808ifeq ($(ARCH), um) 1809CHECKSTACK_ARCH := $(SUBARCH) 1810else 1811CHECKSTACK_ARCH := $(ARCH) 1812endif 1813checkstack: 1814 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1815 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1816 1817kernelrelease: 1818 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1819 1820kernelversion: 1821 @echo $(KERNELVERSION) 1822 1823image_name: 1824 @echo $(KBUILD_IMAGE) 1825 1826# Clear a bunch of variables before executing the submake 1827 1828ifeq ($(quiet),silent_) 1829tools_silent=s 1830endif 1831 1832tools/: FORCE 1833 $(Q)mkdir -p $(objtree)/tools 1834 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1835 1836tools/%: FORCE 1837 $(Q)mkdir -p $(objtree)/tools 1838 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1839 1840# FIXME Should go into a make.lib or something 1841# =========================================================================== 1842 1843quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1844 cmd_rmdirs = rm -rf $(rm-dirs) 1845 1846quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1847 cmd_rmfiles = rm -f $(rm-files) 1848 1849# Run depmod only if we have System.map and depmod is executable 1850quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1851 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1852 $(KERNELRELEASE) 1853 1854# read saved command lines for existing targets 1855existing-targets := $(wildcard $(sort $(targets))) 1856 1857-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1858 1859endif # config-build 1860endif # mixed-build 1861endif # need-sub-make 1862 1863PHONY += FORCE 1864FORCE: 1865 1866# Declare the contents of the PHONY variable as phony. We keep that 1867# information in a variable so we can use it in if_changed and friends. 1868.PHONY: $(PHONY) 1869