1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 4 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Bobtail Squid 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 $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# 72# To put more focus on warnings, be less verbose as default 73# Use 'make V=1' to see the full commands 74 75ifeq ("$(origin V)", "command line") 76 KBUILD_VERBOSE = $(V) 77endif 78ifndef KBUILD_VERBOSE 79 KBUILD_VERBOSE = 0 80endif 81 82ifeq ($(KBUILD_VERBOSE),1) 83 quiet = 84 Q = 85else 86 quiet=quiet_ 87 Q = @ 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92 93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 quiet=silent_ 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# Kbuild will save output files in the current working directory. 100# This does not need to match to the root of the kernel source tree. 101# 102# For example, you can do this: 103# 104# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 105# 106# If you want to save output files in a different location, there are 107# two syntaxes to specify it. 108# 109# 1) O= 110# Use "make O=dir/to/store/output/files/" 111# 112# 2) Set KBUILD_OUTPUT 113# Set the environment variable KBUILD_OUTPUT to point to the output directory. 114# export KBUILD_OUTPUT=dir/to/store/output/files/; make 115# 116# The O= assignment takes precedence over the KBUILD_OUTPUT environment 117# variable. 118 119# Do we want to change the working directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124ifneq ($(KBUILD_OUTPUT),) 125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 126# expand a shell special character '~'. We use a somewhat tedious way here. 127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 128$(if $(abs_objtree),, \ 129 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 130 131# $(realpath ...) resolves symlinks 132abs_objtree := $(realpath $(abs_objtree)) 133else 134abs_objtree := $(CURDIR) 135endif # ifneq ($(KBUILD_OUTPUT),) 136 137ifeq ($(abs_objtree),$(CURDIR)) 138# Suppress "Entering directory ..." unless we are changing the work directory. 139MAKEFLAGS += --no-print-directory 140else 141need-sub-make := 1 142endif 143 144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 145 146ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 147$(error source directory cannot contain spaces or colons) 148endif 149 150ifneq ($(abs_srctree),$(abs_objtree)) 151# Look for make include files relative to root of kernel src 152# 153# This does not become effective immediately because MAKEFLAGS is re-parsed 154# once after the Makefile is read. We need to invoke sub-make. 155MAKEFLAGS += --include-dir=$(abs_srctree) 156need-sub-make := 1 157endif 158 159ifneq ($(filter 3.%,$(MAKE_VERSION)),) 160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 161# We need to invoke sub-make to avoid implicit rules in the top Makefile. 162need-sub-make := 1 163# Cancel implicit rules for this Makefile. 164$(lastword $(MAKEFILE_LIST)): ; 165endif 166 167export abs_srctree abs_objtree 168export sub_make_done := 1 169 170ifeq ($(need-sub-make),1) 171 172PHONY += $(MAKECMDGOALS) sub-make 173 174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 175 @: 176 177# Invoke a second make in the output directory, passing relevant variables 178sub-make: 179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 180 181endif # need-sub-make 182endif # sub_make_done 183 184# We process the rest of the Makefile if this is the final invocation of make 185ifeq ($(need-sub-make),) 186 187# Do not print "Entering directory ...", 188# but we want to display it when entering to the output directory 189# so that IDEs/editors are able to understand relative filenames. 190MAKEFLAGS += --no-print-directory 191 192# Call a source code checker (by default, "sparse") as part of the 193# C compilation. 194# 195# Use 'make C=1' to enable checking of only re-compiled files. 196# Use 'make C=2' to enable checking of *all* source files, regardless 197# of whether they are re-compiled or not. 198# 199# See the file "Documentation/dev-tools/sparse.rst" for more details, 200# including where to get the "sparse" utility. 201 202ifeq ("$(origin C)", "command line") 203 KBUILD_CHECKSRC = $(C) 204endif 205ifndef KBUILD_CHECKSRC 206 KBUILD_CHECKSRC = 0 207endif 208 209# Use make M=dir to specify directory of external module to build 210# Old syntax make ... SUBDIRS=$PWD is still supported 211# Setting the environment variable KBUILD_EXTMOD take precedence 212ifdef SUBDIRS 213 $(warning ================= WARNING ================) 214 $(warning 'SUBDIRS' will be removed after Linux 5.3) 215 $(warning ) 216 $(warning If you are building an individual subdirectory) 217 $(warning in the kernel tree, you can do like this:) 218 $(warning $$ make path/to/dir/you/want/to/build/) 219 $(warning (Do not forget the trailing slash)) 220 $(warning ) 221 $(warning If you are building an external module,) 222 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 223 $(warning ==========================================) 224 KBUILD_EXTMOD ?= $(SUBDIRS) 225endif 226 227ifeq ("$(origin M)", "command line") 228 KBUILD_EXTMOD := $(M) 229endif 230 231export KBUILD_CHECKSRC KBUILD_EXTMOD 232 233extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 234 235ifeq ($(abs_srctree),$(abs_objtree)) 236 # building in the source tree 237 srctree := . 238 building_out_of_srctree := 239else 240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 241 # building in a subdirectory of the source tree 242 srctree := .. 243 else 244 srctree := $(abs_srctree) 245 endif 246 building_out_of_srctree := 1 247endif 248 249ifneq ($(KBUILD_ABS_SRCTREE),) 250srctree := $(abs_srctree) 251endif 252 253objtree := . 254VPATH := $(srctree) 255 256export building_out_of_srctree srctree objtree VPATH 257 258# To make sure we do not include .config for any of the *config targets 259# catch them early, and hand them over to scripts/kconfig/Makefile 260# It is allowed to specify more targets when calling make, including 261# mixing *config targets and build targets. 262# For example 'make oldconfig all'. 263# Detect when mixed targets is specified, and make a second invocation 264# of make so .config is not included in this case either (for *config). 265 266version_h := include/generated/uapi/linux/version.h 267old_version_h := include/linux/version.h 268 269clean-targets := %clean mrproper cleandocs 270no-dot-config-targets := $(clean-targets) \ 271 cscope gtags TAGS tags help% %docs check% coccicheck \ 272 $(version_h) headers headers_% archheaders archscripts \ 273 %asm-generic kernelversion %src-pkg 274no-sync-config-targets := $(no-dot-config-targets) install %install \ 275 kernelrelease 276single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 277 278config-build := 279mixed-build := 280need-config := 1 281may-sync-config := 1 282single-build := 283 284ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 286 need-config := 287 endif 288endif 289 290ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 291 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 292 may-sync-config := 293 endif 294endif 295 296ifneq ($(KBUILD_EXTMOD),) 297 may-sync-config := 298endif 299 300ifeq ($(KBUILD_EXTMOD),) 301 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 302 config-build := 1 303 ifneq ($(words $(MAKECMDGOALS)),1) 304 mixed-build := 1 305 endif 306 endif 307endif 308 309# We cannot build single targets and the others at the same time 310ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 311 single-build := 1 312 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# For "make -j clean all", "make -j mrproper defconfig all", etc. 318ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 319 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324# install and modules_install need also be processed one by one 325ifneq ($(filter install,$(MAKECMDGOALS)),) 326 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 327 mixed-build := 1 328 endif 329endif 330 331ifdef mixed-build 332# =========================================================================== 333# We're called with mixed targets (*config and build targets). 334# Handle them one by one. 335 336PHONY += $(MAKECMDGOALS) __build_one_by_one 337 338$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 339 @: 340 341__build_one_by_one: 342 $(Q)set -e; \ 343 for i in $(MAKECMDGOALS); do \ 344 $(MAKE) -f $(srctree)/Makefile $$i; \ 345 done 346 347else # !mixed-build 348 349include scripts/Kbuild.include 350 351# Read KERNELRELEASE from include/config/kernel.release (if it exists) 352KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 353KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 354export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 355 356include scripts/subarch.include 357 358# Cross compiling and selecting different set of gcc/bin-utils 359# --------------------------------------------------------------------------- 360# 361# When performing cross compilation for other architectures ARCH shall be set 362# to the target architecture. (See arch/* for the possibilities). 363# ARCH can be set during invocation of make: 364# make ARCH=ia64 365# Another way is to have ARCH set in the environment. 366# The default ARCH is the host where make is executed. 367 368# CROSS_COMPILE specify the prefix used for all executables used 369# during compilation. Only gcc and related bin-utils executables 370# are prefixed with $(CROSS_COMPILE). 371# CROSS_COMPILE can be set on the command line 372# make CROSS_COMPILE=ia64-linux- 373# Alternatively CROSS_COMPILE can be set in the environment. 374# Default value for CROSS_COMPILE is not to prefix executables 375# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 376ARCH ?= $(SUBARCH) 377 378# Architecture as present in compile.h 379UTS_MACHINE := $(ARCH) 380SRCARCH := $(ARCH) 381 382# Additional ARCH settings for x86 383ifeq ($(ARCH),i386) 384 SRCARCH := x86 385endif 386ifeq ($(ARCH),x86_64) 387 SRCARCH := x86 388endif 389 390# Additional ARCH settings for sparc 391ifeq ($(ARCH),sparc32) 392 SRCARCH := sparc 393endif 394ifeq ($(ARCH),sparc64) 395 SRCARCH := sparc 396endif 397 398# Additional ARCH settings for sh 399ifeq ($(ARCH),sh64) 400 SRCARCH := sh 401endif 402 403KCONFIG_CONFIG ?= .config 404export KCONFIG_CONFIG 405 406# SHELL used by kbuild 407CONFIG_SHELL := sh 408 409HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 410HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 411HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 412 413HOSTCC = gcc 414HOSTCXX = g++ 415KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 416 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 417 $(HOSTCFLAGS) 418KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 419KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 420KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 421 422# Make variables (CC, etc...) 423AS = $(CROSS_COMPILE)as 424LD = $(CROSS_COMPILE)ld 425CC = $(CROSS_COMPILE)gcc 426CPP = $(CC) -E 427AR = $(CROSS_COMPILE)ar 428NM = $(CROSS_COMPILE)nm 429STRIP = $(CROSS_COMPILE)strip 430OBJCOPY = $(CROSS_COMPILE)objcopy 431OBJDUMP = $(CROSS_COMPILE)objdump 432OBJSIZE = $(CROSS_COMPILE)size 433PAHOLE = pahole 434LEX = flex 435YACC = bison 436AWK = awk 437INSTALLKERNEL := installkernel 438DEPMOD = /sbin/depmod 439PERL = perl 440PYTHON = python 441PYTHON2 = python2 442PYTHON3 = python3 443CHECK = sparse 444BASH = bash 445 446CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 447 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 448NOSTDINC_FLAGS := 449CFLAGS_MODULE = 450AFLAGS_MODULE = 451LDFLAGS_MODULE = 452CFLAGS_KERNEL = 453AFLAGS_KERNEL = 454LDFLAGS_vmlinux = 455 456# Use USERINCLUDE when you must reference the UAPI directories only. 457USERINCLUDE := \ 458 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 459 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 460 -I$(srctree)/include/uapi \ 461 -I$(objtree)/include/generated/uapi \ 462 -include $(srctree)/include/linux/kconfig.h 463 464# Use LINUXINCLUDE when you must reference the include/ directory. 465# Needed to be compatible with the O= option 466LINUXINCLUDE := \ 467 -I$(srctree)/arch/$(SRCARCH)/include \ 468 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 469 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 470 -I$(objtree)/include \ 471 $(USERINCLUDE) 472 473KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 474KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 475 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 476 -Werror=implicit-function-declaration -Werror=implicit-int \ 477 -Wno-format-security \ 478 -std=gnu89 479KBUILD_CPPFLAGS := -D__KERNEL__ 480KBUILD_AFLAGS_KERNEL := 481KBUILD_CFLAGS_KERNEL := 482KBUILD_AFLAGS_MODULE := -DMODULE 483KBUILD_CFLAGS_MODULE := -DMODULE 484KBUILD_LDFLAGS_MODULE := 485export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 486KBUILD_LDFLAGS := 487GCC_PLUGINS_CFLAGS := 488CLANG_FLAGS := 489 490export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 491export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL 492export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 493export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 494 495export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 496export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 497export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 498export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 499export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 500export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 501export KBUILD_ARFLAGS 502 503# Files to ignore in find ... statements 504 505export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 506 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 507 -prune -o 508export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 509 --exclude CVS --exclude .pc --exclude .hg --exclude .git 510 511# =========================================================================== 512# Rules shared between *config targets and build targets 513 514# Basic helpers built in scripts/basic/ 515PHONY += scripts_basic 516scripts_basic: 517 $(Q)$(MAKE) $(build)=scripts/basic 518 $(Q)rm -f .tmp_quiet_recordmcount 519 520PHONY += outputmakefile 521# Before starting out-of-tree build, make sure the source tree is clean. 522# outputmakefile generates a Makefile in the output directory, if using a 523# separate output directory. This allows convenient use of make in the 524# output directory. 525# At the same time when output Makefile generated, generate .gitignore to 526# ignore whole output directory 527outputmakefile: 528ifdef building_out_of_srctree 529 $(Q)if [ -f $(srctree)/.config -o \ 530 -d $(srctree)/include/config -o \ 531 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 532 echo >&2 "***"; \ 533 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 534 echo >&2 "*** in $(abs_srctree)";\ 535 echo >&2 "***"; \ 536 false; \ 537 fi 538 $(Q)ln -fsn $(srctree) source 539 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 540 $(Q)test -e .gitignore || \ 541 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 542endif 543 544ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 545ifneq ($(CROSS_COMPILE),) 546CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 547GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 548CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 549GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 550endif 551ifneq ($(GCC_TOOLCHAIN),) 552CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 553endif 554ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),) 555CLANG_FLAGS += -no-integrated-as 556endif 557CLANG_FLAGS += -Werror=unknown-warning-option 558KBUILD_CFLAGS += $(CLANG_FLAGS) 559KBUILD_AFLAGS += $(CLANG_FLAGS) 560export CLANG_FLAGS 561endif 562 563# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 564# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 565# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 566# and from include/config/auto.conf.cmd to detect the compiler upgrade. 567CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 568 569ifdef config-build 570# =========================================================================== 571# *config targets only - make sure prerequisites are updated, and descend 572# in scripts/kconfig to make the *config target 573 574# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 575# KBUILD_DEFCONFIG may point out an alternative default configuration 576# used for 'make defconfig' 577include arch/$(SRCARCH)/Makefile 578export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 579 580config: outputmakefile scripts_basic FORCE 581 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 582 583%config: outputmakefile scripts_basic FORCE 584 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 585 586else #!config-build 587# =========================================================================== 588# Build targets only - this includes vmlinux, arch specific targets, clean 589# targets and others. In general all targets except *config targets. 590 591# If building an external module we do not care about the all: rule 592# but instead _all depend on modules 593PHONY += all 594ifeq ($(KBUILD_EXTMOD),) 595_all: all 596else 597_all: modules 598endif 599 600# Decide whether to build built-in, modular, or both. 601# Normally, just do built-in. 602 603KBUILD_MODULES := 604KBUILD_BUILTIN := 1 605 606# If we have only "make modules", don't compile built-in objects. 607# When we're building modules with modversions, we need to consider 608# the built-in objects during the descend as well, in order to 609# make sure the checksums are up to date before we record them. 610 611ifeq ($(MAKECMDGOALS),modules) 612 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 613endif 614 615# If we have "make <whatever> modules", compile modules 616# in addition to whatever we do anyway. 617# Just "make" or "make all" shall build modules as well 618 619ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 620 KBUILD_MODULES := 1 621endif 622 623ifeq ($(MAKECMDGOALS),) 624 KBUILD_MODULES := 1 625endif 626 627export KBUILD_MODULES KBUILD_BUILTIN 628 629ifdef need-config 630include include/config/auto.conf 631endif 632 633ifeq ($(KBUILD_EXTMOD),) 634# Objects we will link into vmlinux / subdirs we need to visit 635init-y := init/ 636drivers-y := drivers/ sound/ 637drivers-$(CONFIG_SAMPLES) += samples/ 638drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/ 639net-y := net/ 640libs-y := lib/ 641core-y := usr/ 642virt-y := virt/ 643endif # KBUILD_EXTMOD 644 645# The all: target is the default when no target is given on the 646# command line. 647# This allow a user to issue only 'make' to build a kernel including modules 648# Defaults to vmlinux, but the arch makefile usually adds further targets 649all: vmlinux 650 651CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 652 $(call cc-option,-fno-tree-loop-im) \ 653 $(call cc-disable-warning,maybe-uninitialized,) 654export CFLAGS_GCOV 655 656# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 657ifdef CONFIG_FUNCTION_TRACER 658 CC_FLAGS_FTRACE := -pg 659endif 660 661RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 662RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 663RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 664RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 665RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 666RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 667export RETPOLINE_CFLAGS 668export RETPOLINE_VDSO_CFLAGS 669 670include arch/$(SRCARCH)/Makefile 671 672ifdef need-config 673ifdef may-sync-config 674# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 675# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 676# because some architectures define CROSS_COMPILE there. 677include include/config/auto.conf.cmd 678 679$(KCONFIG_CONFIG): 680 @echo >&2 '***' 681 @echo >&2 '*** Configuration file "$@" not found!' 682 @echo >&2 '***' 683 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 684 @echo >&2 '*** "make menuconfig" or "make xconfig").' 685 @echo >&2 '***' 686 @/bin/false 687 688# The actual configuration files used during the build are stored in 689# include/generated/ and include/config/. Update them if .config is newer than 690# include/config/auto.conf (which mirrors .config). 691# 692# This exploits the 'multi-target pattern rule' trick. 693# The syncconfig should be executed only once to make all the targets. 694%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 695 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 696else # !may-sync-config 697# External modules and some install targets need include/generated/autoconf.h 698# and include/config/auto.conf but do not care if they are up-to-date. 699# Use auto.conf to trigger the test 700PHONY += include/config/auto.conf 701 702include/config/auto.conf: 703 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 704 echo >&2; \ 705 echo >&2 " ERROR: Kernel configuration is invalid."; \ 706 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 707 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 708 echo >&2 ; \ 709 /bin/false) 710 711endif # may-sync-config 712endif # need-config 713 714KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 715KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 716KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 717KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 718KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 719 720ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 721KBUILD_CFLAGS += -O2 722else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 723KBUILD_CFLAGS += -O3 724else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 725KBUILD_CFLAGS += -Os 726endif 727 728ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 729KBUILD_CFLAGS += -Wno-maybe-uninitialized 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) 734 735include scripts/Makefile.kcov 736include scripts/Makefile.gcc-plugins 737 738ifdef CONFIG_READABLE_ASM 739# Disable optimizations that make assembler listings hard to read. 740# reorder blocks reorders the control in the function 741# ipa clone creates specialized cloned functions 742# partial inlining inlines only parts of functions 743KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 744 $(call cc-option,-fno-ipa-cp-clone,) \ 745 $(call cc-option,-fno-partial-inlining) 746endif 747 748ifneq ($(CONFIG_FRAME_WARN),0) 749KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 750endif 751 752stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 753stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 754stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 755 756KBUILD_CFLAGS += $(stackp-flags-y) 757 758ifdef CONFIG_CC_IS_CLANG 759KBUILD_CPPFLAGS += -Qunused-arguments 760KBUILD_CFLAGS += -Wno-format-invalid-specifier 761KBUILD_CFLAGS += -Wno-gnu 762# Quiet clang warning: comparison of unsigned expression < 0 is always false 763KBUILD_CFLAGS += -Wno-tautological-compare 764# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 765# source of a reference will be _MergedGlobals and not on of the whitelisted names. 766# See modpost pattern 2 767KBUILD_CFLAGS += -mno-global-merge 768else 769 770# These warnings generated too much noise in a regular build. 771# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 772KBUILD_CFLAGS += -Wno-unused-but-set-variable 773 774# Warn about unmarked fall-throughs in switch statement. 775# Disabled for clang while comment to attribute conversion happens and 776# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 777KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 778endif 779 780KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 781ifdef CONFIG_FRAME_POINTER 782KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 783else 784# Some targets (ARM with Thumb2, for example), can't be built with frame 785# pointers. For those, we don't have FUNCTION_TRACER automatically 786# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 787# incompatible with -fomit-frame-pointer with current GCC, so we don't use 788# -fomit-frame-pointer with FUNCTION_TRACER. 789ifndef CONFIG_FUNCTION_TRACER 790KBUILD_CFLAGS += -fomit-frame-pointer 791endif 792endif 793 794# Initialize all stack variables with a pattern, if desired. 795ifdef CONFIG_INIT_STACK_ALL 796KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 797endif 798 799DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 800 801ifdef CONFIG_DEBUG_INFO 802ifdef CONFIG_DEBUG_INFO_SPLIT 803DEBUG_CFLAGS += -gsplit-dwarf 804else 805DEBUG_CFLAGS += -g 806endif 807KBUILD_AFLAGS += -Wa,-gdwarf-2 808endif 809ifdef CONFIG_DEBUG_INFO_DWARF4 810DEBUG_CFLAGS += -gdwarf-4 811endif 812 813ifdef CONFIG_DEBUG_INFO_REDUCED 814DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 815 $(call cc-option,-fno-var-tracking) 816endif 817 818KBUILD_CFLAGS += $(DEBUG_CFLAGS) 819export DEBUG_CFLAGS 820 821ifdef CONFIG_FUNCTION_TRACER 822ifdef CONFIG_FTRACE_MCOUNT_RECORD 823 # gcc 5 supports generating the mcount tables directly 824 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 825 CC_FLAGS_FTRACE += -mrecord-mcount 826 export CC_USING_RECORD_MCOUNT := 1 827 endif 828 ifdef CONFIG_HAVE_NOP_MCOUNT 829 ifeq ($(call cc-option-yn, -mnop-mcount),y) 830 CC_FLAGS_FTRACE += -mnop-mcount 831 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 832 endif 833 endif 834endif 835ifdef CONFIG_HAVE_FENTRY 836 ifeq ($(call cc-option-yn, -mfentry),y) 837 CC_FLAGS_FTRACE += -mfentry 838 CC_FLAGS_USING += -DCC_USING_FENTRY 839 endif 840endif 841export CC_FLAGS_FTRACE 842KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 843KBUILD_AFLAGS += $(CC_FLAGS_USING) 844ifdef CONFIG_DYNAMIC_FTRACE 845 ifdef CONFIG_HAVE_C_RECORDMCOUNT 846 BUILD_C_RECORDMCOUNT := y 847 export BUILD_C_RECORDMCOUNT 848 endif 849endif 850endif 851 852# We trigger additional mismatches with less inlining 853ifdef CONFIG_DEBUG_SECTION_MISMATCH 854KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 855endif 856 857ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 858KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 859LDFLAGS_vmlinux += --gc-sections 860endif 861 862ifdef CONFIG_LIVEPATCH 863KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 864endif 865 866# arch Makefile may override CC so keep this after arch Makefile is included 867NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 868 869# warn about C99 declaration after statement 870KBUILD_CFLAGS += -Wdeclaration-after-statement 871 872# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 873KBUILD_CFLAGS += -Wvla 874 875# disable pointer signed / unsigned warnings in gcc 4.0 876KBUILD_CFLAGS += -Wno-pointer-sign 877 878# disable stringop warnings in gcc 8+ 879KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 880 881# disable invalid "can't wrap" optimizations for signed / pointers 882KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 883 884# clang sets -fmerge-all-constants by default as optimization, but this 885# is non-conforming behavior for C and in fact breaks the kernel, so we 886# need to disable it here generally. 887KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 888 889# for gcc -fno-merge-all-constants disables everything, but it is fine 890# to have actual conforming behavior enabled. 891KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 892 893# Make sure -fstack-check isn't enabled (like gentoo apparently did) 894KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 895 896# conserve stack if available 897KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 898 899# Prohibit date/time macros, which would make the build non-deterministic 900KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 901 902# enforce correct pointer usage 903KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 904 905# Require designated initializers for all marked structures 906KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 907 908# change __FILE__ to the relative path from the srctree 909KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 910 911# ensure -fcf-protection is disabled when using retpoline as it is 912# incompatible with -mindirect-branch=thunk-extern 913ifdef CONFIG_RETPOLINE 914KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 915endif 916 917# use the deterministic mode of AR if available 918KBUILD_ARFLAGS := $(call ar-option,D) 919 920include scripts/Makefile.kasan 921include scripts/Makefile.extrawarn 922include scripts/Makefile.ubsan 923 924# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 925KBUILD_CPPFLAGS += $(KCPPFLAGS) 926KBUILD_AFLAGS += $(KAFLAGS) 927KBUILD_CFLAGS += $(KCFLAGS) 928 929KBUILD_LDFLAGS_MODULE += --build-id 930LDFLAGS_vmlinux += --build-id 931 932ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 933LDFLAGS_vmlinux += $(call ld-option, -X,) 934endif 935 936ifeq ($(CONFIG_RELR),y) 937LDFLAGS_vmlinux += --pack-dyn-relocs=relr 938endif 939 940# insure the checker run with the right endianness 941CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 942 943# the checker needs the correct machine size 944CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 945 946# Default kernel image to build when no specific target is given. 947# KBUILD_IMAGE may be overruled on the command line or 948# set in the environment 949# Also any assignments in arch/$(ARCH)/Makefile take precedence over 950# this default value 951export KBUILD_IMAGE ?= vmlinux 952 953# 954# INSTALL_PATH specifies where to place the updated kernel and system map 955# images. Default is /boot, but you can set it to other values 956export INSTALL_PATH ?= /boot 957 958# 959# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 960# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 961# an argument if needed. Otherwise it defaults to the kernel install path 962# 963export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 964 965# 966# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 967# relocations required by build roots. This is not defined in the 968# makefile but the argument can be passed to make if needed. 969# 970 971MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 972export MODLIB 973 974# 975# INSTALL_MOD_STRIP, if defined, will cause modules to be 976# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 977# the default option --strip-debug will be used. Otherwise, 978# INSTALL_MOD_STRIP value will be used as the options to the strip command. 979 980ifdef INSTALL_MOD_STRIP 981ifeq ($(INSTALL_MOD_STRIP),1) 982mod_strip_cmd = $(STRIP) --strip-debug 983else 984mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 985endif # INSTALL_MOD_STRIP=1 986else 987mod_strip_cmd = true 988endif # INSTALL_MOD_STRIP 989export mod_strip_cmd 990 991# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 992# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 993# or CONFIG_MODULE_COMPRESS_XZ. 994 995mod_compress_cmd = true 996ifdef CONFIG_MODULE_COMPRESS 997 ifdef CONFIG_MODULE_COMPRESS_GZIP 998 mod_compress_cmd = gzip -n -f 999 endif # CONFIG_MODULE_COMPRESS_GZIP 1000 ifdef CONFIG_MODULE_COMPRESS_XZ 1001 mod_compress_cmd = xz -f 1002 endif # CONFIG_MODULE_COMPRESS_XZ 1003endif # CONFIG_MODULE_COMPRESS 1004export mod_compress_cmd 1005 1006ifdef CONFIG_MODULE_SIG_ALL 1007$(eval $(call config_filename,MODULE_SIG_KEY)) 1008 1009mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1010else 1011mod_sign_cmd = true 1012endif 1013export mod_sign_cmd 1014 1015HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1016 1017ifdef CONFIG_STACK_VALIDATION 1018 has_libelf := $(call try-run,\ 1019 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1020 ifeq ($(has_libelf),1) 1021 objtool_target := tools/objtool FORCE 1022 else 1023 SKIP_STACK_VALIDATION := 1 1024 export SKIP_STACK_VALIDATION 1025 endif 1026endif 1027 1028PHONY += prepare0 1029 1030export MODORDER := $(extmod-prefix)modules.order 1031 1032ifeq ($(KBUILD_EXTMOD),) 1033core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1034 1035vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1036 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1037 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1038 1039vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1040 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1041 $(drivers-) $(net-) $(libs-) $(virt-)))) 1042 1043build-dirs := $(vmlinux-dirs) 1044clean-dirs := $(vmlinux-alldirs) 1045 1046init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1047core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1048drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1049net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1050libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1051libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1052virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1053 1054# Externally visible symbols (used by link-vmlinux.sh) 1055export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1056 $(drivers-y) $(net-y) $(virt-y) 1057export KBUILD_VMLINUX_LIBS := $(libs-y1) 1058export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1059export LDFLAGS_vmlinux 1060# used by scripts/package/Makefile 1061export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1062 1063vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1064 1065# Recurse until adjust_autoksyms.sh is satisfied 1066PHONY += autoksyms_recursive 1067ifdef CONFIG_TRIM_UNUSED_KSYMS 1068autoksyms_recursive: descend modules.order 1069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1070 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1071endif 1072 1073# For the kernel to actually contain only the needed exported symbols, 1074# we have to build modules as well to determine what those symbols are. 1075# (this can be evaluated only once include/config/auto.conf has been included) 1076ifdef CONFIG_TRIM_UNUSED_KSYMS 1077 KBUILD_MODULES := 1 1078endif 1079 1080autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1081 1082$(autoksyms_h): 1083 $(Q)mkdir -p $(dir $@) 1084 $(Q)touch $@ 1085 1086ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1087 1088# Final link of vmlinux with optional arch pass after final link 1089cmd_link-vmlinux = \ 1090 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1091 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1092 1093vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1094 +$(call if_changed,link-vmlinux) 1095 1096targets := vmlinux 1097 1098# The actual objects are generated when descending, 1099# make sure no implicit rule kicks in 1100$(sort $(vmlinux-deps)): descend ; 1101 1102filechk_kernel.release = \ 1103 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1104 1105# Store (new) KERNELRELEASE string in include/config/kernel.release 1106include/config/kernel.release: FORCE 1107 $(call filechk,kernel.release) 1108 1109# Additional helpers built in scripts/ 1110# Carefully list dependencies so we do not try to build scripts twice 1111# in parallel 1112PHONY += scripts 1113scripts: scripts_basic scripts_dtc 1114 $(Q)$(MAKE) $(build)=$(@) 1115 1116# Things we need to do before we recursively start building the kernel 1117# or the modules are listed in "prepare". 1118# A multi level approach is used. prepareN is processed before prepareN-1. 1119# archprepare is used in arch Makefiles and when processed asm symlink, 1120# version.h and scripts_basic is processed / created. 1121 1122PHONY += prepare archprepare 1123 1124archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1125 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1126 1127prepare0: archprepare 1128 $(Q)$(MAKE) $(build)=scripts/mod 1129 $(Q)$(MAKE) $(build)=. 1130 1131# All the preparing.. 1132prepare: prepare0 prepare-objtool 1133 1134# Support for using generic headers in asm-generic 1135asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1136 1137PHONY += asm-generic uapi-asm-generic 1138asm-generic: uapi-asm-generic 1139 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1140 generic=include/asm-generic 1141uapi-asm-generic: 1142 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1143 generic=include/uapi/asm-generic 1144 1145PHONY += prepare-objtool 1146prepare-objtool: $(objtool_target) 1147ifeq ($(SKIP_STACK_VALIDATION),1) 1148ifdef CONFIG_UNWINDER_ORC 1149 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1150 @false 1151else 1152 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1153endif 1154endif 1155 1156# Generate some files 1157# --------------------------------------------------------------------------- 1158 1159# KERNELRELEASE can change from a few different places, meaning version.h 1160# needs to be updated, so this check is forced on all builds 1161 1162uts_len := 64 1163define filechk_utsrelease.h 1164 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1165 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1166 exit 1; \ 1167 fi; \ 1168 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1169endef 1170 1171define filechk_version.h 1172 echo \#define LINUX_VERSION_CODE $(shell \ 1173 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1174 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1175endef 1176 1177$(version_h): FORCE 1178 $(call filechk,version.h) 1179 $(Q)rm -f $(old_version_h) 1180 1181include/generated/utsrelease.h: include/config/kernel.release FORCE 1182 $(call filechk,utsrelease.h) 1183 1184PHONY += headerdep 1185headerdep: 1186 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1187 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1188 1189# --------------------------------------------------------------------------- 1190# Kernel headers 1191 1192#Default location for installed headers 1193export INSTALL_HDR_PATH = $(objtree)/usr 1194 1195quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1196 cmd_headers_install = \ 1197 mkdir -p $(INSTALL_HDR_PATH); \ 1198 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1199 usr/include $(INSTALL_HDR_PATH) 1200 1201PHONY += headers_install 1202headers_install: headers 1203 $(call cmd,headers_install) 1204 1205PHONY += archheaders archscripts 1206 1207hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1208 1209PHONY += headers 1210headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1211 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1212 $(error Headers not exportable for the $(SRCARCH) architecture)) 1213 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1214 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1215 1216PHONY += headers_check 1217headers_check: headers 1218 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1219 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1 1220 1221ifdef CONFIG_HEADERS_INSTALL 1222prepare: headers 1223endif 1224 1225ifdef CONFIG_HEADERS_CHECK 1226all: headers_check 1227endif 1228 1229PHONY += scripts_unifdef 1230scripts_unifdef: scripts_basic 1231 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1232 1233# --------------------------------------------------------------------------- 1234# Kernel selftest 1235 1236PHONY += kselftest 1237kselftest: 1238 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1239 1240PHONY += kselftest-clean 1241kselftest-clean: 1242 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1243 1244PHONY += kselftest-merge 1245kselftest-merge: 1246 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1247 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1248 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1249 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1250 1251# --------------------------------------------------------------------------- 1252# Devicetree files 1253 1254ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1255dtstree := arch/$(SRCARCH)/boot/dts 1256endif 1257 1258ifneq ($(dtstree),) 1259 1260%.dtb: include/config/kernel.release scripts_dtc 1261 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1262 1263PHONY += dtbs dtbs_install dt_binding_check 1264dtbs dtbs_check: include/config/kernel.release scripts_dtc 1265 $(Q)$(MAKE) $(build)=$(dtstree) 1266 1267dtbs_check: export CHECK_DTBS=1 1268dtbs_check: dt_binding_check 1269 1270dtbs_install: 1271 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1272 1273ifdef CONFIG_OF_EARLY_FLATTREE 1274all: dtbs 1275endif 1276 1277endif 1278 1279PHONY += scripts_dtc 1280scripts_dtc: scripts_basic 1281 $(Q)$(MAKE) $(build)=scripts/dtc 1282 1283dt_binding_check: scripts_dtc 1284 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1285 1286# --------------------------------------------------------------------------- 1287# Modules 1288 1289ifdef CONFIG_MODULES 1290 1291# By default, build modules as well 1292 1293all: modules 1294 1295# Build modules 1296# 1297# A module can be listed more than once in obj-m resulting in 1298# duplicate lines in modules.order files. Those are removed 1299# using awk while concatenating to the final file. 1300 1301PHONY += modules 1302modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin 1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1304 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1305 1306modules.order: descend 1307 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1308 1309modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs)) 1310 1311modules.builtin: $(modbuiltin-dirs) 1312 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1313 1314PHONY += $(modbuiltin-dirs) 1315# tristate.conf is not included from this Makefile. Add it as a prerequisite 1316# here to make it self-healing in case somebody accidentally removes it. 1317$(modbuiltin-dirs): include/config/tristate.conf 1318 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) 1319 1320# Target to prepare building external modules 1321PHONY += modules_prepare 1322modules_prepare: prepare 1323 1324# Target to install modules 1325PHONY += modules_install 1326modules_install: _modinst_ _modinst_post 1327 1328PHONY += _modinst_ 1329_modinst_: 1330 @rm -rf $(MODLIB)/kernel 1331 @rm -f $(MODLIB)/source 1332 @mkdir -p $(MODLIB)/kernel 1333 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1334 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1335 rm -f $(MODLIB)/build ; \ 1336 ln -s $(CURDIR) $(MODLIB)/build ; \ 1337 fi 1338 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1339 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin 1340 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1341 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1342 1343# This depmod is only for convenience to give the initial 1344# boot a modules.dep even before / is mounted read-write. However the 1345# boot script depmod is the master version. 1346PHONY += _modinst_post 1347_modinst_post: _modinst_ 1348 $(call cmd,depmod) 1349 1350ifeq ($(CONFIG_MODULE_SIG), y) 1351PHONY += modules_sign 1352modules_sign: 1353 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1354endif 1355 1356else # CONFIG_MODULES 1357 1358# Modules not configured 1359# --------------------------------------------------------------------------- 1360 1361PHONY += modules modules_install 1362modules modules_install: 1363 @echo >&2 1364 @echo >&2 "The present kernel configuration has modules disabled." 1365 @echo >&2 "Type 'make config' and enable loadable module support." 1366 @echo >&2 "Then build a kernel with module support enabled." 1367 @echo >&2 1368 @exit 1 1369 1370endif # CONFIG_MODULES 1371 1372### 1373# Cleaning is done on three levels. 1374# make clean Delete most generated files 1375# Leave enough to build external modules 1376# make mrproper Delete the current configuration, and all generated files 1377# make distclean Remove editor backup files, patch leftover files and the like 1378 1379# Directories & files removed with 'make clean' 1380CLEAN_DIRS += include/ksym 1381CLEAN_FILES += modules.builtin.modinfo 1382 1383# Directories & files removed with 'make mrproper' 1384MRPROPER_DIRS += include/config include/generated \ 1385 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1386 debian/ snap/ tar-install/ 1387MRPROPER_FILES += .config .config.old .version \ 1388 Module.symvers \ 1389 signing_key.pem signing_key.priv signing_key.x509 \ 1390 x509.genkey extra_certificates signing_key.x509.keyid \ 1391 signing_key.x509.signer vmlinux-gdb.py \ 1392 *.spec 1393 1394# Directories & files removed with 'make distclean' 1395DISTCLEAN_DIRS += 1396DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1397 1398# clean - Delete most, but leave enough to build external modules 1399# 1400clean: rm-dirs := $(CLEAN_DIRS) 1401clean: rm-files := $(CLEAN_FILES) 1402 1403PHONY += archclean vmlinuxclean 1404 1405vmlinuxclean: 1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1407 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1408 1409clean: archclean vmlinuxclean 1410 1411# mrproper - Delete all generated files, including .config 1412# 1413mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1414mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1415mrproper-dirs := $(addprefix _mrproper_,scripts) 1416 1417PHONY += $(mrproper-dirs) mrproper 1418$(mrproper-dirs): 1419 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1420 1421mrproper: clean $(mrproper-dirs) 1422 $(call cmd,rmdirs) 1423 $(call cmd,rmfiles) 1424 1425# distclean 1426# 1427distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1428distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1429 1430PHONY += distclean 1431 1432distclean: mrproper 1433 $(call cmd,rmdirs) 1434 $(call cmd,rmfiles) 1435 @find $(srctree) $(RCS_FIND_IGNORE) \ 1436 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1437 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1438 -o -name 'core' \) \ 1439 -type f -print | xargs rm -f 1440 1441 1442# Packaging of the kernel to various formats 1443# --------------------------------------------------------------------------- 1444 1445%src-pkg: FORCE 1446 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1447%pkg: include/config/kernel.release FORCE 1448 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1449 1450# Brief documentation of the typical targets used 1451# --------------------------------------------------------------------------- 1452 1453boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1454boards := $(sort $(notdir $(boards))) 1455board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1456board-dirs := $(sort $(notdir $(board-dirs:/=))) 1457 1458PHONY += help 1459help: 1460 @echo 'Cleaning targets:' 1461 @echo ' clean - Remove most generated files but keep the config and' 1462 @echo ' enough build support to build external modules' 1463 @echo ' mrproper - Remove all generated files + config + various backup files' 1464 @echo ' distclean - mrproper + remove editor backup and patch files' 1465 @echo '' 1466 @echo 'Configuration targets:' 1467 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1468 @echo '' 1469 @echo 'Other generic targets:' 1470 @echo ' all - Build all targets marked with [*]' 1471 @echo '* vmlinux - Build the bare kernel' 1472 @echo '* modules - Build all modules' 1473 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1474 @echo ' dir/ - Build all files in dir and below' 1475 @echo ' dir/file.[ois] - Build specified target only' 1476 @echo ' dir/file.ll - Build the LLVM assembly file' 1477 @echo ' (requires compiler support for LLVM assembly generation)' 1478 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1479 @echo ' (requires a recent binutils and recent build (System.map))' 1480 @echo ' dir/file.ko - Build module including final link' 1481 @echo ' modules_prepare - Set up for building external modules' 1482 @echo ' tags/TAGS - Generate tags file for editors' 1483 @echo ' cscope - Generate cscope index' 1484 @echo ' gtags - Generate GNU GLOBAL index' 1485 @echo ' kernelrelease - Output the release version string (use with make -s)' 1486 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1487 @echo ' image_name - Output the image name (use with make -s)' 1488 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1489 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1490 echo '' 1491 @echo 'Static analysers:' 1492 @echo ' checkstack - Generate a list of stack hogs' 1493 @echo ' namespacecheck - Name space analysis on compiled kernel' 1494 @echo ' versioncheck - Sanity check on version.h usage' 1495 @echo ' includecheck - Check for duplicate included header files' 1496 @echo ' export_report - List the usages of all exported symbols' 1497 @echo ' headers_check - Sanity check on exported headers' 1498 @echo ' headerdep - Detect inclusion cycles in headers' 1499 @echo ' coccicheck - Check with Coccinelle' 1500 @echo '' 1501 @echo 'Tools:' 1502 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1503 @echo '' 1504 @echo 'Kernel selftest:' 1505 @echo ' kselftest - Build and run kernel selftest (run as root)' 1506 @echo ' Build, install, and boot kernel before' 1507 @echo ' running kselftest on it' 1508 @echo ' kselftest-clean - Remove all generated kselftest files' 1509 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1510 @echo ' .config.' 1511 @echo '' 1512 @$(if $(dtstree), \ 1513 echo 'Devicetree:'; \ 1514 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1515 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1516 echo ' dt_binding_check - Validate device tree binding documents'; \ 1517 echo ' dtbs_check - Validate device tree source files';\ 1518 echo '') 1519 1520 @echo 'Userspace tools targets:' 1521 @echo ' use "make tools/help"' 1522 @echo ' or "cd tools; make help"' 1523 @echo '' 1524 @echo 'Kernel packaging:' 1525 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1526 @echo '' 1527 @echo 'Documentation targets:' 1528 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1529 @echo '' 1530 @echo 'Architecture specific targets ($(SRCARCH)):' 1531 @$(if $(archhelp),$(archhelp),\ 1532 echo ' No architecture specific help defined for $(SRCARCH)') 1533 @echo '' 1534 @$(if $(boards), \ 1535 $(foreach b, $(boards), \ 1536 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1537 echo '') 1538 @$(if $(board-dirs), \ 1539 $(foreach b, $(board-dirs), \ 1540 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1541 printf " %-16s - Show all of the above\\n" help-boards; \ 1542 echo '') 1543 1544 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1545 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1546 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1547 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1548 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1549 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1550 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1551 @echo ' 1: warnings which may be relevant and do not occur too often' 1552 @echo ' 2: warnings which occur quite often but may still be relevant' 1553 @echo ' 3: more obscure warnings, can most likely be ignored' 1554 @echo ' Multiple levels can be combined with W=12 or W=123' 1555 @echo '' 1556 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1557 @echo 'For further info see the ./README file' 1558 1559 1560help-board-dirs := $(addprefix help-,$(board-dirs)) 1561 1562help-boards: $(help-board-dirs) 1563 1564boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1565 1566$(help-board-dirs): help-%: 1567 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1568 @$(if $(boards-per-dir), \ 1569 $(foreach b, $(boards-per-dir), \ 1570 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1571 echo '') 1572 1573 1574# Documentation targets 1575# --------------------------------------------------------------------------- 1576DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1577 linkcheckdocs dochelp refcheckdocs 1578PHONY += $(DOC_TARGETS) 1579$(DOC_TARGETS): 1580 $(Q)$(MAKE) $(build)=Documentation $@ 1581 1582# Misc 1583# --------------------------------------------------------------------------- 1584 1585PHONY += scripts_gdb 1586scripts_gdb: prepare0 1587 $(Q)$(MAKE) $(build)=scripts/gdb 1588 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1589 1590ifdef CONFIG_GDB_SCRIPTS 1591all: scripts_gdb 1592endif 1593 1594else # KBUILD_EXTMOD 1595 1596### 1597# External module support. 1598# When building external modules the kernel used as basis is considered 1599# read-only, and no consistency checks are made and the make 1600# system is not used on the basis kernel. If updates are required 1601# in the basis kernel ordinary make commands (without M=...) must 1602# be used. 1603# 1604# The following are the only valid targets when building external 1605# modules. 1606# make M=dir clean Delete all automatically generated files 1607# make M=dir modules Make all modules in specified dir 1608# make M=dir Same as 'make M=dir modules' 1609# make M=dir modules_install 1610# Install the modules built in the module directory 1611# Assumes install directory is already created 1612 1613# We are always building modules 1614KBUILD_MODULES := 1 1615 1616PHONY += $(objtree)/Module.symvers 1617$(objtree)/Module.symvers: 1618 @test -e $(objtree)/Module.symvers || ( \ 1619 echo; \ 1620 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1621 echo " is missing; modules will have no dependencies and modversions."; \ 1622 echo ) 1623 1624build-dirs := $(KBUILD_EXTMOD) 1625PHONY += modules 1626modules: descend $(objtree)/Module.symvers 1627 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1628 1629PHONY += modules_install 1630modules_install: _emodinst_ _emodinst_post 1631 1632install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1633PHONY += _emodinst_ 1634_emodinst_: 1635 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1636 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1637 1638PHONY += _emodinst_post 1639_emodinst_post: _emodinst_ 1640 $(call cmd,depmod) 1641 1642clean-dirs := $(KBUILD_EXTMOD) 1643clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1644 1645PHONY += / 1646/: 1647 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.' 1648 1649PHONY += help 1650help: 1651 @echo ' Building external modules.' 1652 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1653 @echo '' 1654 @echo ' modules - default target, build the module(s)' 1655 @echo ' modules_install - install the module' 1656 @echo ' clean - remove generated files in module directory only' 1657 @echo '' 1658 1659PHONY += prepare 1660endif # KBUILD_EXTMOD 1661 1662# Handle descending into subdirectories listed in $(build-dirs) 1663# Preset locale variables to speed up the build process. Limit locale 1664# tweaks to this spot to avoid wrong language settings when running 1665# make menuconfig etc. 1666# Error messages still appears in the original language 1667PHONY += descend $(build-dirs) 1668descend: $(build-dirs) 1669$(build-dirs): prepare 1670 $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1 1671 1672clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1673PHONY += $(clean-dirs) clean 1674$(clean-dirs): 1675 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1676 1677clean: $(clean-dirs) 1678 $(call cmd,rmdirs) 1679 $(call cmd,rmfiles) 1680 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1681 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1682 -o -name '*.ko.*' \ 1683 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1684 -o -name '*.dwo' -o -name '*.lst' \ 1685 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \ 1686 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1687 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1688 -o -name '*.asn1.[ch]' \ 1689 -o -name '*.symtypes' -o -name 'modules.order' \ 1690 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1691 -o -name '*.c.[012]*.*' \ 1692 -o -name '*.ll' \ 1693 -o -name '*.gcno' \) -type f -print | xargs rm -f 1694 1695# Generate tags for editors 1696# --------------------------------------------------------------------------- 1697quiet_cmd_tags = GEN $@ 1698 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1699 1700tags TAGS cscope gtags: FORCE 1701 $(call cmd,tags) 1702 1703# Script to generate missing namespace dependencies 1704# --------------------------------------------------------------------------- 1705 1706PHONY += nsdeps 1707 1708nsdeps: modules 1709 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps 1710 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1711 1712# Scripts to check various things for consistency 1713# --------------------------------------------------------------------------- 1714 1715PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1716 1717includecheck: 1718 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1719 -name '*.[hcS]' -type f -print | sort \ 1720 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1721 1722versioncheck: 1723 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1724 -name '*.[hcS]' -type f -print | sort \ 1725 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1726 1727coccicheck: 1728 $(Q)$(BASH) $(srctree)/scripts/$@ 1729 1730namespacecheck: 1731 $(PERL) $(srctree)/scripts/namespace.pl 1732 1733export_report: 1734 $(PERL) $(srctree)/scripts/export_report.pl 1735 1736PHONY += checkstack kernelrelease kernelversion image_name 1737 1738# UML needs a little special treatment here. It wants to use the host 1739# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1740# else wants $(ARCH), including people doing cross-builds, which means 1741# that $(SUBARCH) doesn't work here. 1742ifeq ($(ARCH), um) 1743CHECKSTACK_ARCH := $(SUBARCH) 1744else 1745CHECKSTACK_ARCH := $(ARCH) 1746endif 1747checkstack: 1748 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1749 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1750 1751kernelrelease: 1752 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1753 1754kernelversion: 1755 @echo $(KERNELVERSION) 1756 1757image_name: 1758 @echo $(KBUILD_IMAGE) 1759 1760# Clear a bunch of variables before executing the submake 1761 1762ifeq ($(quiet),silent_) 1763tools_silent=s 1764endif 1765 1766tools/: FORCE 1767 $(Q)mkdir -p $(objtree)/tools 1768 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1769 1770tools/%: FORCE 1771 $(Q)mkdir -p $(objtree)/tools 1772 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1773 1774# Single targets 1775# --------------------------------------------------------------------------- 1776# To build individual files in subdirectories, you can do like this: 1777# 1778# make foo/bar/baz.s 1779# 1780# The supported suffixes for single-target are listed in 'single-targets' 1781# 1782# To build only under specific subdirectories, you can do like this: 1783# 1784# make foo/bar/baz/ 1785 1786ifdef single-build 1787 1788single-all := $(filter $(single-targets), $(MAKECMDGOALS)) 1789 1790# .ko is special because modpost is needed 1791single-ko := $(sort $(filter %.ko, $(single-all))) 1792single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all))) 1793 1794$(single-ko): single_modpost 1795 @: 1796$(single-no-ko): descend 1797 @: 1798 1799ifeq ($(KBUILD_EXTMOD),) 1800# For the single build of in-tree modules, use a temporary file to avoid 1801# the situation of modules_install installing an invalid modules.order. 1802MODORDER := .modules.tmp 1803endif 1804 1805PHONY += single_modpost 1806single_modpost: $(single-no-ko) 1807 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1808 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1809 1810KBUILD_MODULES := 1 1811 1812export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1813 1814single-build = $(if $(filter-out $@/, $(single-no-ko)),1) 1815 1816endif 1817 1818# FIXME Should go into a make.lib or something 1819# =========================================================================== 1820 1821quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1822 cmd_rmdirs = rm -rf $(rm-dirs) 1823 1824quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1825 cmd_rmfiles = rm -f $(rm-files) 1826 1827# Run depmod only if we have System.map and depmod is executable 1828quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1829 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1830 $(KERNELRELEASE) 1831 1832# read saved command lines for existing targets 1833existing-targets := $(wildcard $(sort $(targets))) 1834 1835-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1836 1837endif # config-targets 1838endif # mixed-build 1839endif # need-sub-make 1840 1841PHONY += FORCE 1842FORCE: 1843 1844# Declare the contents of the PHONY variable as phony. We keep that 1845# information in a variable so we can use it in if_changed and friends. 1846.PHONY: $(PHONY) 1847