1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 7 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 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 409 410export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 411 -O2 -fomit-frame-pointer -std=gnu89 412export KBUILD_USERLDFLAGS := 413 414KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 415KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 416KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 417KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 418 419# Make variables (CC, etc...) 420CPP = $(CC) -E 421ifneq ($(LLVM),) 422CC = clang 423LD = ld.lld 424AR = llvm-ar 425NM = llvm-nm 426OBJCOPY = llvm-objcopy 427OBJDUMP = llvm-objdump 428READELF = llvm-readelf 429OBJSIZE = llvm-size 430STRIP = llvm-strip 431else 432CC = $(CROSS_COMPILE)gcc 433LD = $(CROSS_COMPILE)ld 434AR = $(CROSS_COMPILE)ar 435NM = $(CROSS_COMPILE)nm 436OBJCOPY = $(CROSS_COMPILE)objcopy 437OBJDUMP = $(CROSS_COMPILE)objdump 438READELF = $(CROSS_COMPILE)readelf 439OBJSIZE = $(CROSS_COMPILE)size 440STRIP = $(CROSS_COMPILE)strip 441endif 442PAHOLE = pahole 443LEX = flex 444YACC = bison 445AWK = awk 446INSTALLKERNEL := installkernel 447DEPMOD = /sbin/depmod 448PERL = perl 449PYTHON = python 450PYTHON3 = python3 451CHECK = sparse 452BASH = bash 453 454CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 455 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 456NOSTDINC_FLAGS := 457CFLAGS_MODULE = 458AFLAGS_MODULE = 459LDFLAGS_MODULE = 460CFLAGS_KERNEL = 461AFLAGS_KERNEL = 462LDFLAGS_vmlinux = 463 464# Use USERINCLUDE when you must reference the UAPI directories only. 465USERINCLUDE := \ 466 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 467 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 468 -I$(srctree)/include/uapi \ 469 -I$(objtree)/include/generated/uapi \ 470 -include $(srctree)/include/linux/kconfig.h 471 472# Use LINUXINCLUDE when you must reference the include/ directory. 473# Needed to be compatible with the O= option 474LINUXINCLUDE := \ 475 -I$(srctree)/arch/$(SRCARCH)/include \ 476 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 477 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 478 -I$(objtree)/include \ 479 $(USERINCLUDE) 480 481KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 482KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 483 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 484 -Werror=implicit-function-declaration -Werror=implicit-int \ 485 -Wno-format-security \ 486 -std=gnu89 487KBUILD_CPPFLAGS := -D__KERNEL__ 488KBUILD_AFLAGS_KERNEL := 489KBUILD_CFLAGS_KERNEL := 490KBUILD_AFLAGS_MODULE := -DMODULE 491KBUILD_CFLAGS_MODULE := -DMODULE 492KBUILD_LDFLAGS_MODULE := 493export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 494KBUILD_LDFLAGS := 495GCC_PLUGINS_CFLAGS := 496CLANG_FLAGS := 497 498export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 499export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL 500export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 501export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 502 503export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 504export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 505export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 506export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 507export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 508export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 509 510# Files to ignore in find ... statements 511 512export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 513 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 514 -prune -o 515export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 516 --exclude CVS --exclude .pc --exclude .hg --exclude .git 517 518# =========================================================================== 519# Rules shared between *config targets and build targets 520 521# Basic helpers built in scripts/basic/ 522PHONY += scripts_basic 523scripts_basic: 524 $(Q)$(MAKE) $(build)=scripts/basic 525 $(Q)rm -f .tmp_quiet_recordmcount 526 527PHONY += outputmakefile 528# Before starting out-of-tree build, make sure the source tree is clean. 529# outputmakefile generates a Makefile in the output directory, if using a 530# separate output directory. This allows convenient use of make in the 531# output directory. 532# At the same time when output Makefile generated, generate .gitignore to 533# ignore whole output directory 534outputmakefile: 535ifdef building_out_of_srctree 536 $(Q)if [ -f $(srctree)/.config -o \ 537 -d $(srctree)/include/config -o \ 538 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 539 echo >&2 "***"; \ 540 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 541 echo >&2 "*** in $(abs_srctree)";\ 542 echo >&2 "***"; \ 543 false; \ 544 fi 545 $(Q)ln -fsn $(srctree) source 546 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 547 $(Q)test -e .gitignore || \ 548 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 549endif 550 551ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 552ifneq ($(CROSS_COMPILE),) 553CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 554GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 555CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 556GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 557endif 558ifneq ($(GCC_TOOLCHAIN),) 559CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 560endif 561ifneq ($(LLVM_IAS),1) 562CLANG_FLAGS += -no-integrated-as 563endif 564CLANG_FLAGS += -Werror=unknown-warning-option 565KBUILD_CFLAGS += $(CLANG_FLAGS) 566KBUILD_AFLAGS += $(CLANG_FLAGS) 567export CLANG_FLAGS 568endif 569 570# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 571# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 572# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 573# and from include/config/auto.conf.cmd to detect the compiler upgrade. 574CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 575 576ifdef config-build 577# =========================================================================== 578# *config targets only - make sure prerequisites are updated, and descend 579# in scripts/kconfig to make the *config target 580 581# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 582# KBUILD_DEFCONFIG may point out an alternative default configuration 583# used for 'make defconfig' 584include arch/$(SRCARCH)/Makefile 585export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 586 587config: outputmakefile scripts_basic FORCE 588 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 589 590%config: outputmakefile scripts_basic FORCE 591 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 592 593else #!config-build 594# =========================================================================== 595# Build targets only - this includes vmlinux, arch specific targets, clean 596# targets and others. In general all targets except *config targets. 597 598# If building an external module we do not care about the all: rule 599# but instead _all depend on modules 600PHONY += all 601ifeq ($(KBUILD_EXTMOD),) 602_all: all 603else 604_all: modules 605endif 606 607# Decide whether to build built-in, modular, or both. 608# Normally, just do built-in. 609 610KBUILD_MODULES := 611KBUILD_BUILTIN := 1 612 613# If we have only "make modules", don't compile built-in objects. 614# When we're building modules with modversions, we need to consider 615# the built-in objects during the descend as well, in order to 616# make sure the checksums are up to date before we record them. 617 618ifeq ($(MAKECMDGOALS),modules) 619 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 620endif 621 622# If we have "make <whatever> modules", compile modules 623# in addition to whatever we do anyway. 624# Just "make" or "make all" shall build modules as well 625 626ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),) 627 KBUILD_MODULES := 1 628endif 629 630ifeq ($(MAKECMDGOALS),) 631 KBUILD_MODULES := 1 632endif 633 634export KBUILD_MODULES KBUILD_BUILTIN 635 636ifdef need-config 637include include/config/auto.conf 638endif 639 640ifeq ($(KBUILD_EXTMOD),) 641# Objects we will link into vmlinux / subdirs we need to visit 642init-y := init/ 643drivers-y := drivers/ sound/ 644drivers-$(CONFIG_SAMPLES) += samples/ 645net-y := net/ 646libs-y := lib/ 647core-y := usr/ 648virt-y := virt/ 649endif # KBUILD_EXTMOD 650 651# The all: target is the default when no target is given on the 652# command line. 653# This allow a user to issue only 'make' to build a kernel including modules 654# Defaults to vmlinux, but the arch makefile usually adds further targets 655all: vmlinux 656 657CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 658 $(call cc-option,-fno-tree-loop-im) \ 659 $(call cc-disable-warning,maybe-uninitialized,) 660export CFLAGS_GCOV 661 662# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 663ifdef CONFIG_FUNCTION_TRACER 664 CC_FLAGS_FTRACE := -pg 665endif 666 667RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 668RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 669RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 670RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 671RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 672RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 673export RETPOLINE_CFLAGS 674export RETPOLINE_VDSO_CFLAGS 675 676include arch/$(SRCARCH)/Makefile 677 678ifdef need-config 679ifdef may-sync-config 680# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 681# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 682# because some architectures define CROSS_COMPILE there. 683include include/config/auto.conf.cmd 684 685$(KCONFIG_CONFIG): 686 @echo >&2 '***' 687 @echo >&2 '*** Configuration file "$@" not found!' 688 @echo >&2 '***' 689 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 690 @echo >&2 '*** "make menuconfig" or "make xconfig").' 691 @echo >&2 '***' 692 @/bin/false 693 694# The actual configuration files used during the build are stored in 695# include/generated/ and include/config/. Update them if .config is newer than 696# include/config/auto.conf (which mirrors .config). 697# 698# This exploits the 'multi-target pattern rule' trick. 699# The syncconfig should be executed only once to make all the targets. 700# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 701%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG) 702 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 703else # !may-sync-config 704# External modules and some install targets need include/generated/autoconf.h 705# and include/config/auto.conf but do not care if they are up-to-date. 706# Use auto.conf to trigger the test 707PHONY += include/config/auto.conf 708 709include/config/auto.conf: 710 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 711 echo >&2; \ 712 echo >&2 " ERROR: Kernel configuration is invalid."; \ 713 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 714 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 715 echo >&2 ; \ 716 /bin/false) 717 718endif # may-sync-config 719endif # need-config 720 721KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 722KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 723KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 724KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 725KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 726 727ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 728KBUILD_CFLAGS += -O2 729else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 730KBUILD_CFLAGS += -O3 731else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 732KBUILD_CFLAGS += -Os 733endif 734 735# Tell gcc to never replace conditional load with a non-conditional one 736KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 737KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 738 739include scripts/Makefile.kcov 740include scripts/Makefile.gcc-plugins 741 742ifdef CONFIG_READABLE_ASM 743# Disable optimizations that make assembler listings hard to read. 744# reorder blocks reorders the control in the function 745# ipa clone creates specialized cloned functions 746# partial inlining inlines only parts of functions 747KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 748 $(call cc-option,-fno-ipa-cp-clone,) \ 749 $(call cc-option,-fno-partial-inlining) 750endif 751 752ifneq ($(CONFIG_FRAME_WARN),0) 753KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 754endif 755 756stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 757stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 758stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 759 760KBUILD_CFLAGS += $(stackp-flags-y) 761 762ifdef CONFIG_CC_IS_CLANG 763KBUILD_CPPFLAGS += -Qunused-arguments 764KBUILD_CFLAGS += -Wno-format-invalid-specifier 765KBUILD_CFLAGS += -Wno-gnu 766# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 767# source of a reference will be _MergedGlobals and not on of the whitelisted names. 768# See modpost pattern 2 769KBUILD_CFLAGS += -mno-global-merge 770else 771 772# These warnings generated too much noise in a regular build. 773# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 774KBUILD_CFLAGS += -Wno-unused-but-set-variable 775 776# Warn about unmarked fall-throughs in switch statement. 777# Disabled for clang while comment to attribute conversion happens and 778# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 779KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 780endif 781 782KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 783ifdef CONFIG_FRAME_POINTER 784KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 785else 786# Some targets (ARM with Thumb2, for example), can't be built with frame 787# pointers. For those, we don't have FUNCTION_TRACER automatically 788# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 789# incompatible with -fomit-frame-pointer with current GCC, so we don't use 790# -fomit-frame-pointer with FUNCTION_TRACER. 791ifndef CONFIG_FUNCTION_TRACER 792KBUILD_CFLAGS += -fomit-frame-pointer 793endif 794endif 795 796# Initialize all stack variables with a pattern, if desired. 797ifdef CONFIG_INIT_STACK_ALL 798KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 799endif 800 801DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 802 803ifdef CONFIG_DEBUG_INFO 804ifdef CONFIG_DEBUG_INFO_SPLIT 805DEBUG_CFLAGS += -gsplit-dwarf 806else 807DEBUG_CFLAGS += -g 808endif 809KBUILD_AFLAGS += -Wa,-gdwarf-2 810endif 811ifdef CONFIG_DEBUG_INFO_DWARF4 812DEBUG_CFLAGS += -gdwarf-4 813endif 814 815ifdef CONFIG_DEBUG_INFO_REDUCED 816DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 817 $(call cc-option,-fno-var-tracking) 818endif 819 820KBUILD_CFLAGS += $(DEBUG_CFLAGS) 821export DEBUG_CFLAGS 822 823ifdef CONFIG_FUNCTION_TRACER 824ifdef CONFIG_FTRACE_MCOUNT_RECORD 825 # gcc 5 supports generating the mcount tables directly 826 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 827 CC_FLAGS_FTRACE += -mrecord-mcount 828 export CC_USING_RECORD_MCOUNT := 1 829 endif 830 ifdef CONFIG_HAVE_NOP_MCOUNT 831 ifeq ($(call cc-option-yn, -mnop-mcount),y) 832 CC_FLAGS_FTRACE += -mnop-mcount 833 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 834 endif 835 endif 836endif 837ifdef CONFIG_HAVE_FENTRY 838 ifeq ($(call cc-option-yn, -mfentry),y) 839 CC_FLAGS_FTRACE += -mfentry 840 CC_FLAGS_USING += -DCC_USING_FENTRY 841 endif 842endif 843export CC_FLAGS_FTRACE 844KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 845KBUILD_AFLAGS += $(CC_FLAGS_USING) 846ifdef CONFIG_DYNAMIC_FTRACE 847 ifdef CONFIG_HAVE_C_RECORDMCOUNT 848 BUILD_C_RECORDMCOUNT := y 849 export BUILD_C_RECORDMCOUNT 850 endif 851endif 852endif 853 854# We trigger additional mismatches with less inlining 855ifdef CONFIG_DEBUG_SECTION_MISMATCH 856KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 857endif 858 859ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 860KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 861LDFLAGS_vmlinux += --gc-sections 862endif 863 864ifdef CONFIG_LIVEPATCH 865KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 866endif 867 868# arch Makefile may override CC so keep this after arch Makefile is included 869NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 870 871# warn about C99 declaration after statement 872KBUILD_CFLAGS += -Wdeclaration-after-statement 873 874# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 875KBUILD_CFLAGS += -Wvla 876 877# disable pointer signed / unsigned warnings in gcc 4.0 878KBUILD_CFLAGS += -Wno-pointer-sign 879 880# disable stringop warnings in gcc 8+ 881KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 882 883# We'll want to enable this eventually, but it's not going away for 5.7 at least 884KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 885KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 886KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 887 888# Another good warning that we'll want to enable eventually 889KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 890 891# Enabled with W=2, disabled by default as noisy 892KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 893 894# disable invalid "can't wrap" optimizations for signed / pointers 895KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 896 897# clang sets -fmerge-all-constants by default as optimization, but this 898# is non-conforming behavior for C and in fact breaks the kernel, so we 899# need to disable it here generally. 900KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 901 902# for gcc -fno-merge-all-constants disables everything, but it is fine 903# to have actual conforming behavior enabled. 904KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 905 906# Make sure -fstack-check isn't enabled (like gentoo apparently did) 907KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 908 909# conserve stack if available 910KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 911 912# Prohibit date/time macros, which would make the build non-deterministic 913KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 914 915# enforce correct pointer usage 916KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 917 918# Require designated initializers for all marked structures 919KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 920 921# change __FILE__ to the relative path from the srctree 922KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 923 924# ensure -fcf-protection is disabled when using retpoline as it is 925# incompatible with -mindirect-branch=thunk-extern 926ifdef CONFIG_RETPOLINE 927KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 928endif 929 930include scripts/Makefile.kasan 931include scripts/Makefile.extrawarn 932include scripts/Makefile.ubsan 933 934# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 935KBUILD_CPPFLAGS += $(KCPPFLAGS) 936KBUILD_AFLAGS += $(KAFLAGS) 937KBUILD_CFLAGS += $(KCFLAGS) 938 939KBUILD_LDFLAGS_MODULE += --build-id 940LDFLAGS_vmlinux += --build-id 941 942ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 943LDFLAGS_vmlinux += $(call ld-option, -X,) 944endif 945 946ifeq ($(CONFIG_RELR),y) 947LDFLAGS_vmlinux += --pack-dyn-relocs=relr 948endif 949 950# Align the bit size of userspace programs with the kernel 951KBUILD_USERCFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS)) 952KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS)) 953 954# make the checker run with the right architecture 955CHECKFLAGS += --arch=$(ARCH) 956 957# insure the checker run with the right endianness 958CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 959 960# the checker needs the correct machine size 961CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 962 963# Default kernel image to build when no specific target is given. 964# KBUILD_IMAGE may be overruled on the command line or 965# set in the environment 966# Also any assignments in arch/$(ARCH)/Makefile take precedence over 967# this default value 968export KBUILD_IMAGE ?= vmlinux 969 970# 971# INSTALL_PATH specifies where to place the updated kernel and system map 972# images. Default is /boot, but you can set it to other values 973export INSTALL_PATH ?= /boot 974 975# 976# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 977# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 978# an argument if needed. Otherwise it defaults to the kernel install path 979# 980export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 981 982# 983# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 984# relocations required by build roots. This is not defined in the 985# makefile but the argument can be passed to make if needed. 986# 987 988MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 989export MODLIB 990 991# 992# INSTALL_MOD_STRIP, if defined, will cause modules to be 993# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 994# the default option --strip-debug will be used. Otherwise, 995# INSTALL_MOD_STRIP value will be used as the options to the strip command. 996 997ifdef INSTALL_MOD_STRIP 998ifeq ($(INSTALL_MOD_STRIP),1) 999mod_strip_cmd = $(STRIP) --strip-debug 1000else 1001mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1002endif # INSTALL_MOD_STRIP=1 1003else 1004mod_strip_cmd = true 1005endif # INSTALL_MOD_STRIP 1006export mod_strip_cmd 1007 1008# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1009# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1010# or CONFIG_MODULE_COMPRESS_XZ. 1011 1012mod_compress_cmd = true 1013ifdef CONFIG_MODULE_COMPRESS 1014 ifdef CONFIG_MODULE_COMPRESS_GZIP 1015 mod_compress_cmd = gzip -n -f 1016 endif # CONFIG_MODULE_COMPRESS_GZIP 1017 ifdef CONFIG_MODULE_COMPRESS_XZ 1018 mod_compress_cmd = xz -f 1019 endif # CONFIG_MODULE_COMPRESS_XZ 1020endif # CONFIG_MODULE_COMPRESS 1021export mod_compress_cmd 1022 1023ifdef CONFIG_MODULE_SIG_ALL 1024$(eval $(call config_filename,MODULE_SIG_KEY)) 1025 1026mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1027else 1028mod_sign_cmd = true 1029endif 1030export mod_sign_cmd 1031 1032HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1033 1034ifdef CONFIG_STACK_VALIDATION 1035 has_libelf := $(call try-run,\ 1036 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1037 ifeq ($(has_libelf),1) 1038 objtool_target := tools/objtool FORCE 1039 else 1040 SKIP_STACK_VALIDATION := 1 1041 export SKIP_STACK_VALIDATION 1042 endif 1043endif 1044 1045PHONY += prepare0 1046 1047export MODORDER := $(extmod-prefix)modules.order 1048export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1049 1050ifeq ($(KBUILD_EXTMOD),) 1051core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1052 1053vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1054 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1055 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1056 1057vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1058 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1059 $(drivers-) $(net-) $(libs-) $(virt-)))) 1060 1061build-dirs := $(vmlinux-dirs) 1062clean-dirs := $(vmlinux-alldirs) 1063 1064init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1065core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1066drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1067net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1068libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y))) 1069ifdef CONFIG_MODULES 1070libs-y1 := $(filter-out %/, $(libs-y)) 1071libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1072else 1073libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1074endif 1075virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1076 1077# Externally visible symbols (used by link-vmlinux.sh) 1078export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1079 $(drivers-y) $(net-y) $(virt-y) 1080export KBUILD_VMLINUX_LIBS := $(libs-y1) 1081export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1082export LDFLAGS_vmlinux 1083# used by scripts/Makefile.package 1084export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1085 1086vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1087 1088# Recurse until adjust_autoksyms.sh is satisfied 1089PHONY += autoksyms_recursive 1090ifdef CONFIG_TRIM_UNUSED_KSYMS 1091autoksyms_recursive: descend modules.order 1092 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1093 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1094endif 1095 1096# For the kernel to actually contain only the needed exported symbols, 1097# we have to build modules as well to determine what those symbols are. 1098# (this can be evaluated only once include/config/auto.conf has been included) 1099ifdef CONFIG_TRIM_UNUSED_KSYMS 1100 KBUILD_MODULES := 1 1101endif 1102 1103autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1104 1105quiet_cmd_autoksyms_h = GEN $@ 1106 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1107 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1108 1109$(autoksyms_h): 1110 $(call cmd,autoksyms_h) 1111 1112ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1113 1114# Final link of vmlinux with optional arch pass after final link 1115cmd_link-vmlinux = \ 1116 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1117 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1118 1119vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1120 +$(call if_changed,link-vmlinux) 1121 1122targets := vmlinux 1123 1124# The actual objects are generated when descending, 1125# make sure no implicit rule kicks in 1126$(sort $(vmlinux-deps)): descend ; 1127 1128filechk_kernel.release = \ 1129 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1130 1131# Store (new) KERNELRELEASE string in include/config/kernel.release 1132include/config/kernel.release: FORCE 1133 $(call filechk,kernel.release) 1134 1135# Additional helpers built in scripts/ 1136# Carefully list dependencies so we do not try to build scripts twice 1137# in parallel 1138PHONY += scripts 1139scripts: scripts_basic scripts_dtc 1140 $(Q)$(MAKE) $(build)=$(@) 1141 1142# Things we need to do before we recursively start building the kernel 1143# or the modules are listed in "prepare". 1144# A multi level approach is used. prepareN is processed before prepareN-1. 1145# archprepare is used in arch Makefiles and when processed asm symlink, 1146# version.h and scripts_basic is processed / created. 1147 1148PHONY += prepare archprepare 1149 1150archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1151 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1152 1153prepare0: archprepare 1154 $(Q)$(MAKE) $(build)=scripts/mod 1155 $(Q)$(MAKE) $(build)=. 1156 1157# All the preparing.. 1158prepare: prepare0 prepare-objtool 1159 1160# Support for using generic headers in asm-generic 1161asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1162 1163PHONY += asm-generic uapi-asm-generic 1164asm-generic: uapi-asm-generic 1165 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1166 generic=include/asm-generic 1167uapi-asm-generic: 1168 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1169 generic=include/uapi/asm-generic 1170 1171PHONY += prepare-objtool 1172prepare-objtool: $(objtool_target) 1173ifeq ($(SKIP_STACK_VALIDATION),1) 1174ifdef CONFIG_UNWINDER_ORC 1175 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1176 @false 1177else 1178 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1179endif 1180endif 1181 1182# Generate some files 1183# --------------------------------------------------------------------------- 1184 1185# KERNELRELEASE can change from a few different places, meaning version.h 1186# needs to be updated, so this check is forced on all builds 1187 1188uts_len := 64 1189define filechk_utsrelease.h 1190 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1191 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1192 exit 1; \ 1193 fi; \ 1194 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1195endef 1196 1197define filechk_version.h 1198 echo \#define LINUX_VERSION_CODE $(shell \ 1199 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1200 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1201endef 1202 1203$(version_h): FORCE 1204 $(call filechk,version.h) 1205 $(Q)rm -f $(old_version_h) 1206 1207include/generated/utsrelease.h: include/config/kernel.release FORCE 1208 $(call filechk,utsrelease.h) 1209 1210PHONY += headerdep 1211headerdep: 1212 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1213 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1214 1215# --------------------------------------------------------------------------- 1216# Kernel headers 1217 1218#Default location for installed headers 1219export INSTALL_HDR_PATH = $(objtree)/usr 1220 1221quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1222 cmd_headers_install = \ 1223 mkdir -p $(INSTALL_HDR_PATH); \ 1224 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1225 usr/include $(INSTALL_HDR_PATH) 1226 1227PHONY += headers_install 1228headers_install: headers 1229 $(call cmd,headers_install) 1230 1231PHONY += archheaders archscripts 1232 1233hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1234 1235PHONY += headers 1236headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1237 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1238 $(error Headers not exportable for the $(SRCARCH) architecture)) 1239 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1240 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1241 1242# Deprecated. It is no-op now. 1243PHONY += headers_check 1244headers_check: 1245 @: 1246 1247ifdef CONFIG_HEADERS_INSTALL 1248prepare: headers 1249endif 1250 1251PHONY += scripts_unifdef 1252scripts_unifdef: scripts_basic 1253 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1254 1255# --------------------------------------------------------------------------- 1256# Kernel selftest 1257 1258PHONY += kselftest 1259kselftest: 1260 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1261 1262kselftest-%: FORCE 1263 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1264 1265PHONY += kselftest-merge 1266kselftest-merge: 1267 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1268 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1269 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1270 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1271 1272# --------------------------------------------------------------------------- 1273# Devicetree files 1274 1275ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1276dtstree := arch/$(SRCARCH)/boot/dts 1277endif 1278 1279ifneq ($(dtstree),) 1280 1281%.dtb: include/config/kernel.release scripts_dtc 1282 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1283 1284PHONY += dtbs dtbs_install dtbs_check 1285dtbs: include/config/kernel.release scripts_dtc 1286 $(Q)$(MAKE) $(build)=$(dtstree) 1287 1288ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1289export CHECK_DTBS=y 1290dtbs: dt_binding_check 1291endif 1292 1293dtbs_check: dtbs 1294 1295dtbs_install: 1296 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1297 1298ifdef CONFIG_OF_EARLY_FLATTREE 1299all: dtbs 1300endif 1301 1302endif 1303 1304PHONY += scripts_dtc 1305scripts_dtc: scripts_basic 1306 $(Q)$(MAKE) $(build)=scripts/dtc 1307 1308ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1309export CHECK_DT_BINDING=y 1310endif 1311 1312PHONY += dt_binding_check 1313dt_binding_check: scripts_dtc 1314 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1315 1316# --------------------------------------------------------------------------- 1317# Modules 1318 1319ifdef CONFIG_MODULES 1320 1321# By default, build modules as well 1322 1323all: modules 1324 1325# Build modules 1326# 1327# A module can be listed more than once in obj-m resulting in 1328# duplicate lines in modules.order files. Those are removed 1329# using awk while concatenating to the final file. 1330 1331PHONY += modules 1332modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1334 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1335 1336modules.order: descend 1337 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1338 1339# Target to prepare building external modules 1340PHONY += modules_prepare 1341modules_prepare: prepare 1342 1343# Target to install modules 1344PHONY += modules_install 1345modules_install: _modinst_ _modinst_post 1346 1347PHONY += _modinst_ 1348_modinst_: 1349 @rm -rf $(MODLIB)/kernel 1350 @rm -f $(MODLIB)/source 1351 @mkdir -p $(MODLIB)/kernel 1352 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1353 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1354 rm -f $(MODLIB)/build ; \ 1355 ln -s $(CURDIR) $(MODLIB)/build ; \ 1356 fi 1357 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1358 @cp -f modules.builtin $(MODLIB)/ 1359 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1360 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1361 1362# This depmod is only for convenience to give the initial 1363# boot a modules.dep even before / is mounted read-write. However the 1364# boot script depmod is the master version. 1365PHONY += _modinst_post 1366_modinst_post: _modinst_ 1367 $(call cmd,depmod) 1368 1369ifeq ($(CONFIG_MODULE_SIG), y) 1370PHONY += modules_sign 1371modules_sign: 1372 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1373endif 1374 1375else # CONFIG_MODULES 1376 1377# Modules not configured 1378# --------------------------------------------------------------------------- 1379 1380PHONY += modules modules_install 1381modules modules_install: 1382 @echo >&2 1383 @echo >&2 "The present kernel configuration has modules disabled." 1384 @echo >&2 "Type 'make config' and enable loadable module support." 1385 @echo >&2 "Then build a kernel with module support enabled." 1386 @echo >&2 1387 @exit 1 1388 1389endif # CONFIG_MODULES 1390 1391### 1392# Cleaning is done on three levels. 1393# make clean Delete most generated files 1394# Leave enough to build external modules 1395# make mrproper Delete the current configuration, and all generated files 1396# make distclean Remove editor backup files, patch leftover files and the like 1397 1398# Directories & files removed with 'make clean' 1399CLEAN_DIRS += include/ksym 1400CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps 1401 1402# Directories & files removed with 'make mrproper' 1403MRPROPER_DIRS += include/config include/generated \ 1404 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1405 debian/ snap/ tar-install/ 1406MRPROPER_FILES += .config .config.old .version \ 1407 Module.symvers \ 1408 signing_key.pem signing_key.priv signing_key.x509 \ 1409 x509.genkey extra_certificates signing_key.x509.keyid \ 1410 signing_key.x509.signer vmlinux-gdb.py \ 1411 *.spec 1412 1413# Directories & files removed with 'make distclean' 1414DISTCLEAN_DIRS += 1415DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1416 1417# clean - Delete most, but leave enough to build external modules 1418# 1419clean: rm-dirs := $(CLEAN_DIRS) 1420clean: rm-files := $(CLEAN_FILES) 1421 1422PHONY += archclean vmlinuxclean 1423 1424vmlinuxclean: 1425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1426 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1427 1428clean: archclean vmlinuxclean 1429 1430# mrproper - Delete all generated files, including .config 1431# 1432mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1433mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1434mrproper-dirs := $(addprefix _mrproper_,scripts) 1435 1436PHONY += $(mrproper-dirs) mrproper 1437$(mrproper-dirs): 1438 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1439 1440mrproper: clean $(mrproper-dirs) 1441 $(call cmd,rmdirs) 1442 $(call cmd,rmfiles) 1443 1444# distclean 1445# 1446distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1447distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1448 1449PHONY += distclean 1450 1451distclean: mrproper 1452 $(call cmd,rmdirs) 1453 $(call cmd,rmfiles) 1454 @find $(srctree) $(RCS_FIND_IGNORE) \ 1455 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1456 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1457 -o -name 'core' \) \ 1458 -type f -print | xargs rm -f 1459 1460 1461# Packaging of the kernel to various formats 1462# --------------------------------------------------------------------------- 1463 1464%src-pkg: FORCE 1465 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1466%pkg: include/config/kernel.release FORCE 1467 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1468 1469# Brief documentation of the typical targets used 1470# --------------------------------------------------------------------------- 1471 1472boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1473boards := $(sort $(notdir $(boards))) 1474board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1475board-dirs := $(sort $(notdir $(board-dirs:/=))) 1476 1477PHONY += help 1478help: 1479 @echo 'Cleaning targets:' 1480 @echo ' clean - Remove most generated files but keep the config and' 1481 @echo ' enough build support to build external modules' 1482 @echo ' mrproper - Remove all generated files + config + various backup files' 1483 @echo ' distclean - mrproper + remove editor backup and patch files' 1484 @echo '' 1485 @echo 'Configuration targets:' 1486 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1487 @echo '' 1488 @echo 'Other generic targets:' 1489 @echo ' all - Build all targets marked with [*]' 1490 @echo '* vmlinux - Build the bare kernel' 1491 @echo '* modules - Build all modules' 1492 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1493 @echo ' dir/ - Build all files in dir and below' 1494 @echo ' dir/file.[ois] - Build specified target only' 1495 @echo ' dir/file.ll - Build the LLVM assembly file' 1496 @echo ' (requires compiler support for LLVM assembly generation)' 1497 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1498 @echo ' (requires a recent binutils and recent build (System.map))' 1499 @echo ' dir/file.ko - Build module including final link' 1500 @echo ' modules_prepare - Set up for building external modules' 1501 @echo ' tags/TAGS - Generate tags file for editors' 1502 @echo ' cscope - Generate cscope index' 1503 @echo ' gtags - Generate GNU GLOBAL index' 1504 @echo ' kernelrelease - Output the release version string (use with make -s)' 1505 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1506 @echo ' image_name - Output the image name (use with make -s)' 1507 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1508 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1509 echo '' 1510 @echo 'Static analysers:' 1511 @echo ' checkstack - Generate a list of stack hogs' 1512 @echo ' namespacecheck - Name space analysis on compiled kernel' 1513 @echo ' versioncheck - Sanity check on version.h usage' 1514 @echo ' includecheck - Check for duplicate included header files' 1515 @echo ' export_report - List the usages of all exported symbols' 1516 @echo ' headerdep - Detect inclusion cycles in headers' 1517 @echo ' coccicheck - Check with Coccinelle' 1518 @echo '' 1519 @echo 'Tools:' 1520 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1521 @echo '' 1522 @echo 'Kernel selftest:' 1523 @echo ' kselftest - Build and run kernel selftest' 1524 @echo ' Build, install, and boot kernel before' 1525 @echo ' running kselftest on it' 1526 @echo ' Run as root for full coverage' 1527 @echo ' kselftest-all - Build kernel selftest' 1528 @echo ' kselftest-install - Build and install kernel selftest' 1529 @echo ' kselftest-clean - Remove all generated kselftest files' 1530 @echo ' kselftest-merge - Merge all the config dependencies of' 1531 @echo ' kselftest to existing .config.' 1532 @echo '' 1533 @$(if $(dtstree), \ 1534 echo 'Devicetree:'; \ 1535 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1536 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1537 echo ' dt_binding_check - Validate device tree binding documents'; \ 1538 echo ' dtbs_check - Validate device tree source files';\ 1539 echo '') 1540 1541 @echo 'Userspace tools targets:' 1542 @echo ' use "make tools/help"' 1543 @echo ' or "cd tools; make help"' 1544 @echo '' 1545 @echo 'Kernel packaging:' 1546 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1547 @echo '' 1548 @echo 'Documentation targets:' 1549 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1550 @echo '' 1551 @echo 'Architecture specific targets ($(SRCARCH)):' 1552 @$(if $(archhelp),$(archhelp),\ 1553 echo ' No architecture specific help defined for $(SRCARCH)') 1554 @echo '' 1555 @$(if $(boards), \ 1556 $(foreach b, $(boards), \ 1557 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1558 echo '') 1559 @$(if $(board-dirs), \ 1560 $(foreach b, $(board-dirs), \ 1561 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1562 printf " %-16s - Show all of the above\\n" help-boards; \ 1563 echo '') 1564 1565 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1566 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1567 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1568 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1569 @echo ' (sparse by default)' 1570 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1571 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1572 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1573 @echo ' 1: warnings which may be relevant and do not occur too often' 1574 @echo ' 2: warnings which occur quite often but may still be relevant' 1575 @echo ' 3: more obscure warnings, can most likely be ignored' 1576 @echo ' Multiple levels can be combined with W=12 or W=123' 1577 @echo '' 1578 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1579 @echo 'For further info see the ./README file' 1580 1581 1582help-board-dirs := $(addprefix help-,$(board-dirs)) 1583 1584help-boards: $(help-board-dirs) 1585 1586boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1587 1588$(help-board-dirs): help-%: 1589 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1590 @$(if $(boards-per-dir), \ 1591 $(foreach b, $(boards-per-dir), \ 1592 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1593 echo '') 1594 1595 1596# Documentation targets 1597# --------------------------------------------------------------------------- 1598DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1599 linkcheckdocs dochelp refcheckdocs 1600PHONY += $(DOC_TARGETS) 1601$(DOC_TARGETS): 1602 $(Q)$(MAKE) $(build)=Documentation $@ 1603 1604# Misc 1605# --------------------------------------------------------------------------- 1606 1607PHONY += scripts_gdb 1608scripts_gdb: prepare0 1609 $(Q)$(MAKE) $(build)=scripts/gdb 1610 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1611 1612ifdef CONFIG_GDB_SCRIPTS 1613all: scripts_gdb 1614endif 1615 1616else # KBUILD_EXTMOD 1617 1618### 1619# External module support. 1620# When building external modules the kernel used as basis is considered 1621# read-only, and no consistency checks are made and the make 1622# system is not used on the basis kernel. If updates are required 1623# in the basis kernel ordinary make commands (without M=...) must 1624# be used. 1625# 1626# The following are the only valid targets when building external 1627# modules. 1628# make M=dir clean Delete all automatically generated files 1629# make M=dir modules Make all modules in specified dir 1630# make M=dir Same as 'make M=dir modules' 1631# make M=dir modules_install 1632# Install the modules built in the module directory 1633# Assumes install directory is already created 1634 1635# We are always building modules 1636KBUILD_MODULES := 1 1637 1638PHONY += $(objtree)/Module.symvers 1639$(objtree)/Module.symvers: 1640 @test -e $(objtree)/Module.symvers || ( \ 1641 echo; \ 1642 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1643 echo " is missing; modules will have no dependencies and modversions."; \ 1644 echo ) 1645 1646build-dirs := $(KBUILD_EXTMOD) 1647PHONY += modules 1648modules: descend $(objtree)/Module.symvers 1649 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1650 1651PHONY += modules_install 1652modules_install: _emodinst_ _emodinst_post 1653 1654install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1655PHONY += _emodinst_ 1656_emodinst_: 1657 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1658 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1659 1660PHONY += _emodinst_post 1661_emodinst_post: _emodinst_ 1662 $(call cmd,depmod) 1663 1664clean-dirs := $(KBUILD_EXTMOD) 1665clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1666 1667PHONY += help 1668help: 1669 @echo ' Building external modules.' 1670 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1671 @echo '' 1672 @echo ' modules - default target, build the module(s)' 1673 @echo ' modules_install - install the module' 1674 @echo ' clean - remove generated files in module directory only' 1675 @echo '' 1676 1677PHONY += prepare 1678endif # KBUILD_EXTMOD 1679 1680# Single targets 1681# --------------------------------------------------------------------------- 1682# To build individual files in subdirectories, you can do like this: 1683# 1684# make foo/bar/baz.s 1685# 1686# The supported suffixes for single-target are listed in 'single-targets' 1687# 1688# To build only under specific subdirectories, you can do like this: 1689# 1690# make foo/bar/baz/ 1691 1692ifdef single-build 1693 1694# .ko is special because modpost is needed 1695single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1696single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1697 1698$(single-ko): single_modpost 1699 @: 1700$(single-no-ko): descend 1701 @: 1702 1703ifeq ($(KBUILD_EXTMOD),) 1704# For the single build of in-tree modules, use a temporary file to avoid 1705# the situation of modules_install installing an invalid modules.order. 1706MODORDER := .modules.tmp 1707endif 1708 1709PHONY += single_modpost 1710single_modpost: $(single-no-ko) 1711 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1712 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1713 1714KBUILD_MODULES := 1 1715 1716export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1717 1718# trim unrelated directories 1719build-dirs := $(foreach d, $(build-dirs), \ 1720 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1721 1722endif 1723 1724# Handle descending into subdirectories listed in $(build-dirs) 1725# Preset locale variables to speed up the build process. Limit locale 1726# tweaks to this spot to avoid wrong language settings when running 1727# make menuconfig etc. 1728# Error messages still appears in the original language 1729PHONY += descend $(build-dirs) 1730descend: $(build-dirs) 1731$(build-dirs): prepare 1732 $(Q)$(MAKE) $(build)=$@ \ 1733 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \ 1734 need-builtin=1 need-modorder=1 1735 1736clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1737PHONY += $(clean-dirs) clean 1738$(clean-dirs): 1739 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1740 1741clean: $(clean-dirs) 1742 $(call cmd,rmdirs) 1743 $(call cmd,rmfiles) 1744 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1745 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1746 -o -name '*.ko.*' \ 1747 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1748 -o -name '*.dwo' -o -name '*.lst' \ 1749 -o -name '*.su' -o -name '*.mod' \ 1750 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1751 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1752 -o -name '*.asn1.[ch]' \ 1753 -o -name '*.symtypes' -o -name 'modules.order' \ 1754 -o -name '.tmp_*.o.*' \ 1755 -o -name '*.c.[012]*.*' \ 1756 -o -name '*.ll' \ 1757 -o -name '*.gcno' \) -type f -print | xargs rm -f 1758 1759# Generate tags for editors 1760# --------------------------------------------------------------------------- 1761quiet_cmd_tags = GEN $@ 1762 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1763 1764tags TAGS cscope gtags: FORCE 1765 $(call cmd,tags) 1766 1767# Script to generate missing namespace dependencies 1768# --------------------------------------------------------------------------- 1769 1770PHONY += nsdeps 1771nsdeps: export KBUILD_NSDEPS=1 1772nsdeps: modules 1773 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1774 1775# Scripts to check various things for consistency 1776# --------------------------------------------------------------------------- 1777 1778PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1779 1780includecheck: 1781 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1782 -name '*.[hcS]' -type f -print | sort \ 1783 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1784 1785versioncheck: 1786 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1787 -name '*.[hcS]' -type f -print | sort \ 1788 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1789 1790coccicheck: 1791 $(Q)$(BASH) $(srctree)/scripts/$@ 1792 1793namespacecheck: 1794 $(PERL) $(srctree)/scripts/namespace.pl 1795 1796export_report: 1797 $(PERL) $(srctree)/scripts/export_report.pl 1798 1799PHONY += checkstack kernelrelease kernelversion image_name 1800 1801# UML needs a little special treatment here. It wants to use the host 1802# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1803# else wants $(ARCH), including people doing cross-builds, which means 1804# that $(SUBARCH) doesn't work here. 1805ifeq ($(ARCH), um) 1806CHECKSTACK_ARCH := $(SUBARCH) 1807else 1808CHECKSTACK_ARCH := $(ARCH) 1809endif 1810checkstack: 1811 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1812 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1813 1814kernelrelease: 1815 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1816 1817kernelversion: 1818 @echo $(KERNELVERSION) 1819 1820image_name: 1821 @echo $(KBUILD_IMAGE) 1822 1823# Clear a bunch of variables before executing the submake 1824 1825ifeq ($(quiet),silent_) 1826tools_silent=s 1827endif 1828 1829tools/: FORCE 1830 $(Q)mkdir -p $(objtree)/tools 1831 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1832 1833tools/%: FORCE 1834 $(Q)mkdir -p $(objtree)/tools 1835 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1836 1837# FIXME Should go into a make.lib or something 1838# =========================================================================== 1839 1840quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1841 cmd_rmdirs = rm -rf $(rm-dirs) 1842 1843quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1844 cmd_rmfiles = rm -f $(rm-files) 1845 1846# Run depmod only if we have System.map and depmod is executable 1847quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1848 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1849 $(KERNELRELEASE) 1850 1851# read saved command lines for existing targets 1852existing-targets := $(wildcard $(sort $(targets))) 1853 1854-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1855 1856endif # config-build 1857endif # mixed-build 1858endif # need-sub-make 1859 1860PHONY += FORCE 1861FORCE: 1862 1863# Declare the contents of the PHONY variable as phony. We keep that 1864# information in a variable so we can use it in if_changed and friends. 1865.PHONY: $(PHONY) 1866