1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 20 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Shy Crocodile 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# Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour) 20MAKEFLAGS += -rR 21 22# Avoid funny character set dependencies 23unexport LC_ALL 24LC_COLLATE=C 25LC_NUMERIC=C 26export LC_COLLATE LC_NUMERIC 27 28# Avoid interference with shell env settings 29unexport GREP_OPTIONS 30 31# We are using a recursive build, so we need to do a little thinking 32# to get the ordering right. 33# 34# Most importantly: sub-Makefiles should only ever modify files in 35# their own directory. If in some directory we have a dependency on 36# a file in another dir (which doesn't happen often, but it's often 37# unavoidable when linking the built-in.a targets which finally 38# turn into vmlinux), we will call a sub make in that other dir, and 39# after that we are sure that everything which is in that other dir 40# is now up to date. 41# 42# The only cases where we need to modify files which have global 43# effects are thus separated out and done before the recursive 44# descending is started. They are now explicitly listed as the 45# prepare rule. 46 47# Beautify output 48# --------------------------------------------------------------------------- 49# 50# Normally, we echo the whole command before executing it. By making 51# that echo $($(quiet)$(cmd)), we now have the possibility to set 52# $(quiet) to choose other forms of output instead, e.g. 53# 54# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 55# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 56# 57# If $(quiet) is empty, the whole command will be printed. 58# If it is set to "quiet_", only the short version will be printed. 59# If it is set to "silent_", nothing will be printed at all, since 60# the variable $(silent_cmd_cc_o_c) doesn't exist. 61# 62# A simple variant is to prefix commands with $(Q) - that's useful 63# for commands that shall be hidden in non-verbose mode. 64# 65# $(Q)ln $@ :< 66# 67# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 68# If KBUILD_VERBOSE equals 1 then the above command is displayed. 69# 70# To put more focus on warnings, be less verbose as default 71# Use 'make V=1' to see the full commands 72 73ifeq ("$(origin V)", "command line") 74 KBUILD_VERBOSE = $(V) 75endif 76ifndef KBUILD_VERBOSE 77 KBUILD_VERBOSE = 0 78endif 79 80ifeq ($(KBUILD_VERBOSE),1) 81 quiet = 82 Q = 83else 84 quiet=quiet_ 85 Q = @ 86endif 87 88# If the user is running make -s (silent mode), suppress echoing of 89# commands 90 91ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 92 quiet=silent_ 93 tools_silent=s 94endif 95 96export quiet Q KBUILD_VERBOSE 97 98# kbuild supports saving output files in a separate directory. 99# To locate output files in a separate directory two syntaxes are supported. 100# In both cases the working directory must be the root of the kernel src. 101# 1) O= 102# Use "make O=dir/to/store/output/files/" 103# 104# 2) Set KBUILD_OUTPUT 105# Set the environment variable KBUILD_OUTPUT to point to the directory 106# where the output files shall be placed. 107# export KBUILD_OUTPUT=dir/to/store/output/files/ 108# make 109# 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment 111# variable. 112 113# KBUILD_SRC is not intended to be used by the regular user (for now), 114# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 115ifeq ($(KBUILD_SRC),) 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123# Cancel implicit rules on top Makefile 124$(CURDIR)/Makefile Makefile: ; 125 126ifneq ($(words $(subst :, ,$(CURDIR))), 1) 127 $(error main directory cannot contain spaces nor colons) 128endif 129 130ifneq ($(KBUILD_OUTPUT),) 131# check that the output directory actually exists 132saved-output := $(KBUILD_OUTPUT) 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 134 && pwd) 135$(if $(KBUILD_OUTPUT),, \ 136 $(error failed to create output directory "$(saved-output)")) 137 138# Look for make include files relative to root of kernel src 139# 140# This does not become effective immediately because MAKEFLAGS is re-parsed 141# once after the Makefile is read. It is OK since we are going to invoke 142# 'sub-make' below. 143MAKEFLAGS += --include-dir=$(CURDIR) 144 145PHONY += $(MAKECMDGOALS) sub-make 146 147$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 148 @: 149 150# Invoke a second make in the output directory, passing relevant variables 151sub-make: 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 154 155# Leave processing to above invocation of make 156skip-makefile := 1 157endif # ifneq ($(KBUILD_OUTPUT),) 158endif # ifeq ($(KBUILD_SRC),) 159 160# We process the rest of the Makefile if this is the final invocation of make 161ifeq ($(skip-makefile),) 162 163# Do not print "Entering directory ...", 164# but we want to display it when entering to the output directory 165# so that IDEs/editors are able to understand relative filenames. 166MAKEFLAGS += --no-print-directory 167 168# Call a source code checker (by default, "sparse") as part of the 169# C compilation. 170# 171# Use 'make C=1' to enable checking of only re-compiled files. 172# Use 'make C=2' to enable checking of *all* source files, regardless 173# of whether they are re-compiled or not. 174# 175# See the file "Documentation/dev-tools/sparse.rst" for more details, 176# including where to get the "sparse" utility. 177 178ifeq ("$(origin C)", "command line") 179 KBUILD_CHECKSRC = $(C) 180endif 181ifndef KBUILD_CHECKSRC 182 KBUILD_CHECKSRC = 0 183endif 184 185# Use make M=dir to specify directory of external module to build 186# Old syntax make ... SUBDIRS=$PWD is still supported 187# Setting the environment variable KBUILD_EXTMOD take precedence 188ifdef SUBDIRS 189 $(warning ================= WARNING ================) 190 $(warning 'SUBDIRS' will be removed after Linux 5.3) 191 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 192 $(warning ==========================================) 193 KBUILD_EXTMOD ?= $(SUBDIRS) 194endif 195 196ifeq ("$(origin M)", "command line") 197 KBUILD_EXTMOD := $(M) 198endif 199 200ifeq ($(KBUILD_SRC),) 201 # building in the source tree 202 srctree := . 203else 204 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 205 # building in a subdirectory of the source tree 206 srctree := .. 207 else 208 srctree := $(KBUILD_SRC) 209 endif 210endif 211 212export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 213 214objtree := . 215src := $(srctree) 216obj := $(objtree) 217 218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 219 220export srctree objtree VPATH 221 222# To make sure we do not include .config for any of the *config targets 223# catch them early, and hand them over to scripts/kconfig/Makefile 224# It is allowed to specify more targets when calling make, including 225# mixing *config targets and build targets. 226# For example 'make oldconfig all'. 227# Detect when mixed targets is specified, and make a second invocation 228# of make so .config is not included in this case either (for *config). 229 230version_h := include/generated/uapi/linux/version.h 231old_version_h := include/linux/version.h 232 233clean-targets := %clean mrproper cleandocs 234no-dot-config-targets := $(clean-targets) \ 235 cscope gtags TAGS tags help% %docs check% coccicheck \ 236 $(version_h) headers_% archheaders archscripts \ 237 %asm-generic kernelversion %src-pkg 238no-sync-config-targets := $(no-dot-config-targets) install %install \ 239 kernelrelease 240 241config-targets := 0 242mixed-targets := 0 243dot-config := 1 244may-sync-config := 1 245 246ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 247 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 248 dot-config := 0 249 endif 250endif 251 252ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 253 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 254 may-sync-config := 0 255 endif 256endif 257 258ifneq ($(KBUILD_EXTMOD),) 259 may-sync-config := 0 260endif 261 262ifeq ($(KBUILD_EXTMOD),) 263 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 264 config-targets := 1 265 ifneq ($(words $(MAKECMDGOALS)),1) 266 mixed-targets := 1 267 endif 268 endif 269endif 270 271# For "make -j clean all", "make -j mrproper defconfig all", etc. 272ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 273 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 274 mixed-targets := 1 275 endif 276endif 277 278# install and modules_install need also be processed one by one 279ifneq ($(filter install,$(MAKECMDGOALS)),) 280 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 281 mixed-targets := 1 282 endif 283endif 284 285ifeq ($(mixed-targets),1) 286# =========================================================================== 287# We're called with mixed targets (*config and build targets). 288# Handle them one by one. 289 290PHONY += $(MAKECMDGOALS) __build_one_by_one 291 292$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 293 @: 294 295__build_one_by_one: 296 $(Q)set -e; \ 297 for i in $(MAKECMDGOALS); do \ 298 $(MAKE) -f $(srctree)/Makefile $$i; \ 299 done 300 301else 302 303# We need some generic definitions (do not try to remake the file). 304scripts/Kbuild.include: ; 305include scripts/Kbuild.include 306 307# Read KERNELRELEASE from include/config/kernel.release (if it exists) 308KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 309KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 310export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 311 312include scripts/subarch.include 313 314# Cross compiling and selecting different set of gcc/bin-utils 315# --------------------------------------------------------------------------- 316# 317# When performing cross compilation for other architectures ARCH shall be set 318# to the target architecture. (See arch/* for the possibilities). 319# ARCH can be set during invocation of make: 320# make ARCH=ia64 321# Another way is to have ARCH set in the environment. 322# The default ARCH is the host where make is executed. 323 324# CROSS_COMPILE specify the prefix used for all executables used 325# during compilation. Only gcc and related bin-utils executables 326# are prefixed with $(CROSS_COMPILE). 327# CROSS_COMPILE can be set on the command line 328# make CROSS_COMPILE=ia64-linux- 329# Alternatively CROSS_COMPILE can be set in the environment. 330# Default value for CROSS_COMPILE is not to prefix executables 331# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 332ARCH ?= $(SUBARCH) 333 334# Architecture as present in compile.h 335UTS_MACHINE := $(ARCH) 336SRCARCH := $(ARCH) 337 338# Additional ARCH settings for x86 339ifeq ($(ARCH),i386) 340 SRCARCH := x86 341endif 342ifeq ($(ARCH),x86_64) 343 SRCARCH := x86 344endif 345 346# Additional ARCH settings for sparc 347ifeq ($(ARCH),sparc32) 348 SRCARCH := sparc 349endif 350ifeq ($(ARCH),sparc64) 351 SRCARCH := sparc 352endif 353 354# Additional ARCH settings for sh 355ifeq ($(ARCH),sh64) 356 SRCARCH := sh 357endif 358 359KCONFIG_CONFIG ?= .config 360export KCONFIG_CONFIG 361 362# SHELL used by kbuild 363CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 364 else if [ -x /bin/bash ]; then echo /bin/bash; \ 365 else echo sh; fi ; fi) 366 367HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 368HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 369HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 370 371HOSTCC = gcc 372HOSTCXX = g++ 373KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 374 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 375 $(HOSTCFLAGS) 376KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 377KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 378KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 379 380# Make variables (CC, etc...) 381AS = $(CROSS_COMPILE)as 382LD = $(CROSS_COMPILE)ld 383CC = $(CROSS_COMPILE)gcc 384CPP = $(CC) -E 385AR = $(CROSS_COMPILE)ar 386NM = $(CROSS_COMPILE)nm 387STRIP = $(CROSS_COMPILE)strip 388OBJCOPY = $(CROSS_COMPILE)objcopy 389OBJDUMP = $(CROSS_COMPILE)objdump 390LEX = flex 391YACC = bison 392AWK = awk 393GENKSYMS = scripts/genksyms/genksyms 394INSTALLKERNEL := installkernel 395DEPMOD = /sbin/depmod 396PERL = perl 397PYTHON = python 398PYTHON2 = python2 399PYTHON3 = python3 400CHECK = sparse 401 402CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 403 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 404NOSTDINC_FLAGS = 405CFLAGS_MODULE = 406AFLAGS_MODULE = 407LDFLAGS_MODULE = 408CFLAGS_KERNEL = 409AFLAGS_KERNEL = 410LDFLAGS_vmlinux = 411 412# Use USERINCLUDE when you must reference the UAPI directories only. 413USERINCLUDE := \ 414 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 415 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 416 -I$(srctree)/include/uapi \ 417 -I$(objtree)/include/generated/uapi \ 418 -include $(srctree)/include/linux/kconfig.h 419 420# Use LINUXINCLUDE when you must reference the include/ directory. 421# Needed to be compatible with the O= option 422LINUXINCLUDE := \ 423 -I$(srctree)/arch/$(SRCARCH)/include \ 424 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 425 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 426 -I$(objtree)/include \ 427 $(USERINCLUDE) 428 429KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 430KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 431 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 432 -Werror-implicit-function-declaration -Werror=implicit-int \ 433 -Wno-format-security \ 434 -std=gnu89 435KBUILD_CPPFLAGS := -D__KERNEL__ 436KBUILD_AFLAGS_KERNEL := 437KBUILD_CFLAGS_KERNEL := 438KBUILD_AFLAGS_MODULE := -DMODULE 439KBUILD_CFLAGS_MODULE := -DMODULE 440KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 441KBUILD_LDFLAGS := 442GCC_PLUGINS_CFLAGS := 443 444export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 445export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 446export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 447export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 448 449export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 450export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 451export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 452export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 453export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 454export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 455export KBUILD_ARFLAGS 456 457# When compiling out-of-tree modules, put MODVERDIR in the module 458# tree rather than in the kernel tree. The kernel tree might 459# even be read-only. 460export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 461 462# Files to ignore in find ... statements 463 464export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 465 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 466 -prune -o 467export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 468 --exclude CVS --exclude .pc --exclude .hg --exclude .git 469 470# =========================================================================== 471# Rules shared between *config targets and build targets 472 473# Basic helpers built in scripts/basic/ 474PHONY += scripts_basic 475scripts_basic: 476 $(Q)$(MAKE) $(build)=scripts/basic 477 $(Q)rm -f .tmp_quiet_recordmcount 478 479# To avoid any implicit rule to kick in, define an empty command. 480scripts/basic/%: scripts_basic ; 481 482PHONY += outputmakefile 483# outputmakefile generates a Makefile in the output directory, if using a 484# separate output directory. This allows convenient use of make in the 485# output directory. 486outputmakefile: 487ifneq ($(KBUILD_SRC),) 488 $(Q)ln -fsn $(srctree) source 489 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 490endif 491 492ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 493ifneq ($(CROSS_COMPILE),) 494CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 495GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) 496CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 497GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 498endif 499ifneq ($(GCC_TOOLCHAIN),) 500CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 501endif 502CLANG_FLAGS += -no-integrated-as 503KBUILD_CFLAGS += $(CLANG_FLAGS) 504KBUILD_AFLAGS += $(CLANG_FLAGS) 505export CLANG_FLAGS 506endif 507 508RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 509RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 510RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 511RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 512RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 513RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 514export RETPOLINE_CFLAGS 515export RETPOLINE_VDSO_CFLAGS 516 517# check for 'asm goto' 518ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 519 CC_HAVE_ASM_GOTO := 1 520 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 521 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 522endif 523 524# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 525# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 526# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 527# and from include/config/auto.conf.cmd to detect the compiler upgrade. 528CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 529 530ifeq ($(config-targets),1) 531# =========================================================================== 532# *config targets only - make sure prerequisites are updated, and descend 533# in scripts/kconfig to make the *config target 534 535# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 536# KBUILD_DEFCONFIG may point out an alternative default configuration 537# used for 'make defconfig' 538include arch/$(SRCARCH)/Makefile 539export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 540 541config: scripts_basic outputmakefile FORCE 542 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 543 544%config: scripts_basic outputmakefile FORCE 545 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 546 547else 548# =========================================================================== 549# Build targets only - this includes vmlinux, arch specific targets, clean 550# targets and others. In general all targets except *config targets. 551 552# If building an external module we do not care about the all: rule 553# but instead _all depend on modules 554PHONY += all 555ifeq ($(KBUILD_EXTMOD),) 556_all: all 557else 558_all: modules 559endif 560 561# Decide whether to build built-in, modular, or both. 562# Normally, just do built-in. 563 564KBUILD_MODULES := 565KBUILD_BUILTIN := 1 566 567# If we have only "make modules", don't compile built-in objects. 568# When we're building modules with modversions, we need to consider 569# the built-in objects during the descend as well, in order to 570# make sure the checksums are up to date before we record them. 571 572ifeq ($(MAKECMDGOALS),modules) 573 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 574endif 575 576# If we have "make <whatever> modules", compile modules 577# in addition to whatever we do anyway. 578# Just "make" or "make all" shall build modules as well 579 580ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 581 KBUILD_MODULES := 1 582endif 583 584ifeq ($(MAKECMDGOALS),) 585 KBUILD_MODULES := 1 586endif 587 588export KBUILD_MODULES KBUILD_BUILTIN 589 590ifeq ($(KBUILD_EXTMOD),) 591# Objects we will link into vmlinux / subdirs we need to visit 592init-y := init/ 593drivers-y := drivers/ sound/ firmware/ 594net-y := net/ 595libs-y := lib/ 596core-y := usr/ 597virt-y := virt/ 598endif # KBUILD_EXTMOD 599 600ifeq ($(dot-config),1) 601include include/config/auto.conf 602endif 603 604# The all: target is the default when no target is given on the 605# command line. 606# This allow a user to issue only 'make' to build a kernel including modules 607# Defaults to vmlinux, but the arch makefile usually adds further targets 608all: vmlinux 609 610CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 611 $(call cc-option,-fno-tree-loop-im) \ 612 $(call cc-disable-warning,maybe-uninitialized,) 613export CFLAGS_GCOV 614 615# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 616ifdef CONFIG_FUNCTION_TRACER 617 CC_FLAGS_FTRACE := -pg 618endif 619 620# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 621# values of the respective KBUILD_* variables 622ARCH_CPPFLAGS := 623ARCH_AFLAGS := 624ARCH_CFLAGS := 625include arch/$(SRCARCH)/Makefile 626 627ifeq ($(dot-config),1) 628ifeq ($(may-sync-config),1) 629# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 630# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 631# because some architectures define CROSS_COMPILE there. 632-include include/config/auto.conf.cmd 633 634# To avoid any implicit rule to kick in, define an empty command 635$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 636 637# The actual configuration files used during the build are stored in 638# include/generated/ and include/config/. Update them if .config is newer than 639# include/config/auto.conf (which mirrors .config). 640include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 641 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 642else 643# External modules and some install targets need include/generated/autoconf.h 644# and include/config/auto.conf but do not care if they are up-to-date. 645# Use auto.conf to trigger the test 646PHONY += include/config/auto.conf 647 648include/config/auto.conf: 649 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 650 echo >&2; \ 651 echo >&2 " ERROR: Kernel configuration is invalid."; \ 652 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 653 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 654 echo >&2 ; \ 655 /bin/false) 656 657endif # may-sync-config 658endif # $(dot-config) 659 660KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 661KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 662KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 663KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 664KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 665 666ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 667KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 668KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 669else 670ifdef CONFIG_PROFILE_ALL_BRANCHES 671KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 672else 673KBUILD_CFLAGS += -O2 674endif 675endif 676 677KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 678 $(call cc-disable-warning,maybe-uninitialized,)) 679 680# Tell gcc to never replace conditional load with a non-conditional one 681KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 682 683include scripts/Makefile.kcov 684include scripts/Makefile.gcc-plugins 685 686ifdef CONFIG_READABLE_ASM 687# Disable optimizations that make assembler listings hard to read. 688# reorder blocks reorders the control in the function 689# ipa clone creates specialized cloned functions 690# partial inlining inlines only parts of functions 691KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 692 $(call cc-option,-fno-ipa-cp-clone,) \ 693 $(call cc-option,-fno-partial-inlining) 694endif 695 696ifneq ($(CONFIG_FRAME_WARN),0) 697KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 698endif 699 700stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 701stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 702stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 703 704KBUILD_CFLAGS += $(stackp-flags-y) 705 706ifdef CONFIG_CC_IS_CLANG 707KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 708KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 709KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 710KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 711# Quiet clang warning: comparison of unsigned expression < 0 is always false 712KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 713# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 714# source of a reference will be _MergedGlobals and not on of the whitelisted names. 715# See modpost pattern 2 716KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 717KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 718else 719 720# These warnings generated too much noise in a regular build. 721# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 722KBUILD_CFLAGS += -Wno-unused-but-set-variable 723endif 724 725KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 726ifdef CONFIG_FRAME_POINTER 727KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 728else 729# Some targets (ARM with Thumb2, for example), can't be built with frame 730# pointers. For those, we don't have FUNCTION_TRACER automatically 731# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 732# incompatible with -fomit-frame-pointer with current GCC, so we don't use 733# -fomit-frame-pointer with FUNCTION_TRACER. 734ifndef CONFIG_FUNCTION_TRACER 735KBUILD_CFLAGS += -fomit-frame-pointer 736endif 737endif 738 739KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 740 741ifdef CONFIG_DEBUG_INFO 742ifdef CONFIG_DEBUG_INFO_SPLIT 743KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 744else 745KBUILD_CFLAGS += -g 746endif 747KBUILD_AFLAGS += -Wa,-gdwarf-2 748endif 749ifdef CONFIG_DEBUG_INFO_DWARF4 750KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 751endif 752 753ifdef CONFIG_DEBUG_INFO_REDUCED 754KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 755 $(call cc-option,-fno-var-tracking) 756endif 757 758ifdef CONFIG_FUNCTION_TRACER 759ifdef CONFIG_FTRACE_MCOUNT_RECORD 760 # gcc 5 supports generating the mcount tables directly 761 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 762 CC_FLAGS_FTRACE += -mrecord-mcount 763 export CC_USING_RECORD_MCOUNT := 1 764 endif 765 ifdef CONFIG_HAVE_NOP_MCOUNT 766 ifeq ($(call cc-option-yn, -mnop-mcount),y) 767 CC_FLAGS_FTRACE += -mnop-mcount 768 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 769 endif 770 endif 771endif 772ifdef CONFIG_HAVE_FENTRY 773 ifeq ($(call cc-option-yn, -mfentry),y) 774 CC_FLAGS_FTRACE += -mfentry 775 CC_FLAGS_USING += -DCC_USING_FENTRY 776 endif 777endif 778export CC_FLAGS_FTRACE 779KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 780KBUILD_AFLAGS += $(CC_FLAGS_USING) 781ifdef CONFIG_DYNAMIC_FTRACE 782 ifdef CONFIG_HAVE_C_RECORDMCOUNT 783 BUILD_C_RECORDMCOUNT := y 784 export BUILD_C_RECORDMCOUNT 785 endif 786endif 787endif 788 789# We trigger additional mismatches with less inlining 790ifdef CONFIG_DEBUG_SECTION_MISMATCH 791KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 792endif 793 794ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 795KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 796LDFLAGS_vmlinux += --gc-sections 797endif 798 799# arch Makefile may override CC so keep this after arch Makefile is included 800NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 801 802# warn about C99 declaration after statement 803KBUILD_CFLAGS += -Wdeclaration-after-statement 804 805# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 806KBUILD_CFLAGS += $(call cc-option,-Wvla) 807 808# disable pointer signed / unsigned warnings in gcc 4.0 809KBUILD_CFLAGS += -Wno-pointer-sign 810 811# disable stringop warnings in gcc 8+ 812KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 813 814# disable invalid "can't wrap" optimizations for signed / pointers 815KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 816 817# clang sets -fmerge-all-constants by default as optimization, but this 818# is non-conforming behavior for C and in fact breaks the kernel, so we 819# need to disable it here generally. 820KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 821 822# for gcc -fno-merge-all-constants disables everything, but it is fine 823# to have actual conforming behavior enabled. 824KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 825 826# Make sure -fstack-check isn't enabled (like gentoo apparently did) 827KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 828 829# conserve stack if available 830KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 831 832# Prohibit date/time macros, which would make the build non-deterministic 833KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 834 835# enforce correct pointer usage 836KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 837 838# Require designated initializers for all marked structures 839KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 840 841# change __FILE__ to the relative path from the srctree 842KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 843 844# use the deterministic mode of AR if available 845KBUILD_ARFLAGS := $(call ar-option,D) 846 847include scripts/Makefile.kasan 848include scripts/Makefile.extrawarn 849include scripts/Makefile.ubsan 850 851# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 852# last assignments 853KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 854KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 855KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 856 857# Use --build-id when available. 858LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 859KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 860LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 861 862ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 863LDFLAGS_vmlinux += $(call ld-option, -X,) 864endif 865 866# insure the checker run with the right endianness 867CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 868 869# the checker needs the correct machine size 870CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 871 872# Default kernel image to build when no specific target is given. 873# KBUILD_IMAGE may be overruled on the command line or 874# set in the environment 875# Also any assignments in arch/$(ARCH)/Makefile take precedence over 876# this default value 877export KBUILD_IMAGE ?= vmlinux 878 879# 880# INSTALL_PATH specifies where to place the updated kernel and system map 881# images. Default is /boot, but you can set it to other values 882export INSTALL_PATH ?= /boot 883 884# 885# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 886# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 887# an argument if needed. Otherwise it defaults to the kernel install path 888# 889export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 890 891# 892# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 893# relocations required by build roots. This is not defined in the 894# makefile but the argument can be passed to make if needed. 895# 896 897MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 898export MODLIB 899 900# 901# INSTALL_MOD_STRIP, if defined, will cause modules to be 902# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 903# the default option --strip-debug will be used. Otherwise, 904# INSTALL_MOD_STRIP value will be used as the options to the strip command. 905 906ifdef INSTALL_MOD_STRIP 907ifeq ($(INSTALL_MOD_STRIP),1) 908mod_strip_cmd = $(STRIP) --strip-debug 909else 910mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 911endif # INSTALL_MOD_STRIP=1 912else 913mod_strip_cmd = true 914endif # INSTALL_MOD_STRIP 915export mod_strip_cmd 916 917# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 918# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 919# or CONFIG_MODULE_COMPRESS_XZ. 920 921mod_compress_cmd = true 922ifdef CONFIG_MODULE_COMPRESS 923 ifdef CONFIG_MODULE_COMPRESS_GZIP 924 mod_compress_cmd = gzip -n -f 925 endif # CONFIG_MODULE_COMPRESS_GZIP 926 ifdef CONFIG_MODULE_COMPRESS_XZ 927 mod_compress_cmd = xz -f 928 endif # CONFIG_MODULE_COMPRESS_XZ 929endif # CONFIG_MODULE_COMPRESS 930export mod_compress_cmd 931 932# Select initial ramdisk compression format, default is gzip(1). 933# This shall be used by the dracut(8) tool while creating an initramfs image. 934# 935INITRD_COMPRESS-y := gzip 936INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 937INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 938INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 939INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 940INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 941# do not export INITRD_COMPRESS, since we didn't actually 942# choose a sane default compression above. 943# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 944 945ifdef CONFIG_MODULE_SIG_ALL 946$(eval $(call config_filename,MODULE_SIG_KEY)) 947 948mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 949else 950mod_sign_cmd = true 951endif 952export mod_sign_cmd 953 954ifdef CONFIG_STACK_VALIDATION 955 has_libelf := $(call try-run,\ 956 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 957 ifeq ($(has_libelf),1) 958 objtool_target := tools/objtool FORCE 959 else 960 SKIP_STACK_VALIDATION := 1 961 export SKIP_STACK_VALIDATION 962 endif 963endif 964 965 966ifeq ($(KBUILD_EXTMOD),) 967core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 968 969vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 970 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 971 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 972 973vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 974 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 975 976init-y := $(patsubst %/, %/built-in.a, $(init-y)) 977core-y := $(patsubst %/, %/built-in.a, $(core-y)) 978drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 979net-y := $(patsubst %/, %/built-in.a, $(net-y)) 980libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 981libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 982virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 983 984# Externally visible symbols (used by link-vmlinux.sh) 985export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 986export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 987export KBUILD_VMLINUX_LIBS := $(libs-y1) 988export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 989export LDFLAGS_vmlinux 990# used by scripts/package/Makefile 991export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 992 993vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 994 995# Recurse until adjust_autoksyms.sh is satisfied 996PHONY += autoksyms_recursive 997autoksyms_recursive: $(vmlinux-deps) 998ifdef CONFIG_TRIM_UNUSED_KSYMS 999 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1000 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1001endif 1002 1003# For the kernel to actually contain only the needed exported symbols, 1004# we have to build modules as well to determine what those symbols are. 1005# (this can be evaluated only once include/config/auto.conf has been included) 1006ifdef CONFIG_TRIM_UNUSED_KSYMS 1007 KBUILD_MODULES := 1 1008endif 1009 1010autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1011 1012$(autoksyms_h): 1013 $(Q)mkdir -p $(dir $@) 1014 $(Q)touch $@ 1015 1016ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1017 1018# Final link of vmlinux with optional arch pass after final link 1019cmd_link-vmlinux = \ 1020 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1021 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1022 1023vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1024ifdef CONFIG_GDB_SCRIPTS 1025 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1026endif 1027 +$(call if_changed,link-vmlinux) 1028 1029targets := vmlinux 1030 1031# Build samples along the rest of the kernel. This needs headers_install. 1032ifdef CONFIG_SAMPLES 1033vmlinux-dirs += samples 1034samples: headers_install 1035endif 1036 1037# The actual objects are generated when descending, 1038# make sure no implicit rule kicks in 1039$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1040 1041# Handle descending into subdirectories listed in $(vmlinux-dirs) 1042# Preset locale variables to speed up the build process. Limit locale 1043# tweaks to this spot to avoid wrong language settings when running 1044# make menuconfig etc. 1045# Error messages still appears in the original language 1046 1047PHONY += $(vmlinux-dirs) 1048$(vmlinux-dirs): prepare 1049 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1050 1051define filechk_kernel.release 1052 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1053endef 1054 1055# Store (new) KERNELRELEASE string in include/config/kernel.release 1056include/config/kernel.release: $(srctree)/Makefile FORCE 1057 $(call filechk,kernel.release) 1058 1059# Additional helpers built in scripts/ 1060# Carefully list dependencies so we do not try to build scripts twice 1061# in parallel 1062PHONY += scripts 1063scripts: scripts_basic scripts_dtc 1064 $(Q)$(MAKE) $(build)=$(@) 1065 1066# Things we need to do before we recursively start building the kernel 1067# or the modules are listed in "prepare". 1068# A multi level approach is used. prepareN is processed before prepareN-1. 1069# archprepare is used in arch Makefiles and when processed asm symlink, 1070# version.h and scripts_basic is processed / created. 1071 1072# Listed in dependency order 1073PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1074 1075# prepare3 is used to check if we are building in a separate output directory, 1076# and if so do: 1077# 1) Check that make has not been executed in the kernel src $(srctree) 1078prepare3: include/config/kernel.release 1079ifneq ($(KBUILD_SRC),) 1080 @$(kecho) ' Using $(srctree) as source for kernel' 1081 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1082 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1083 echo >&2 " in the '$(srctree)' directory.";\ 1084 /bin/false; \ 1085 fi; 1086endif 1087 1088# prepare2 creates a makefile if using a separate output directory. 1089# From this point forward, .config has been reprocessed, so any rules 1090# that need to depend on updated CONFIG_* values can be checked here. 1091prepare2: prepare3 outputmakefile asm-generic 1092 1093prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1094 $(cmd_crmodverdir) 1095 1096archprepare: archheaders archscripts prepare1 scripts 1097 1098prepare0: archprepare 1099 $(Q)$(MAKE) $(build)=scripts/mod 1100 $(Q)$(MAKE) $(build)=. 1101 1102# All the preparing.. 1103prepare: prepare0 prepare-objtool 1104 1105# Support for using generic headers in asm-generic 1106asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1107 1108PHONY += asm-generic uapi-asm-generic 1109asm-generic: uapi-asm-generic 1110 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm 1111uapi-asm-generic: 1112 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm 1113 1114PHONY += prepare-objtool 1115prepare-objtool: $(objtool_target) 1116ifeq ($(SKIP_STACK_VALIDATION),1) 1117ifdef CONFIG_UNWINDER_ORC 1118 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1119 @false 1120else 1121 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1122endif 1123endif 1124 1125# Generate some files 1126# --------------------------------------------------------------------------- 1127 1128# KERNELRELEASE can change from a few different places, meaning version.h 1129# needs to be updated, so this check is forced on all builds 1130 1131uts_len := 64 1132define filechk_utsrelease.h 1133 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1134 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1135 exit 1; \ 1136 fi; \ 1137 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1138endef 1139 1140define filechk_version.h 1141 (echo \#define LINUX_VERSION_CODE $(shell \ 1142 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1143 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1144endef 1145 1146$(version_h): FORCE 1147 $(call filechk,version.h) 1148 $(Q)rm -f $(old_version_h) 1149 1150include/generated/utsrelease.h: include/config/kernel.release FORCE 1151 $(call filechk,utsrelease.h) 1152 1153PHONY += headerdep 1154headerdep: 1155 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1156 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1157 1158# --------------------------------------------------------------------------- 1159# Kernel headers 1160 1161#Default location for installed headers 1162export INSTALL_HDR_PATH = $(objtree)/usr 1163 1164# If we do an all arch process set dst to include/arch-$(SRCARCH) 1165hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1166 1167PHONY += archheaders 1168archheaders: 1169 1170PHONY += archscripts 1171archscripts: 1172 1173PHONY += __headers 1174__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1175 $(Q)$(MAKE) $(build)=scripts build_unifdef 1176 1177PHONY += headers_install_all 1178headers_install_all: 1179 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1180 1181PHONY += headers_install 1182headers_install: __headers 1183 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1184 $(error Headers not exportable for the $(SRCARCH) architecture)) 1185 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1186 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1187 1188PHONY += headers_check_all 1189headers_check_all: headers_install_all 1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1191 1192PHONY += headers_check 1193headers_check: headers_install 1194 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1195 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1196 1197ifdef CONFIG_HEADERS_CHECK 1198all: headers_check 1199endif 1200 1201# --------------------------------------------------------------------------- 1202# Kernel selftest 1203 1204PHONY += kselftest 1205kselftest: 1206 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1207 1208PHONY += kselftest-clean 1209kselftest-clean: 1210 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1211 1212PHONY += kselftest-merge 1213kselftest-merge: 1214 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1215 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1216 -m $(objtree)/.config \ 1217 $(srctree)/tools/testing/selftests/*/config 1218 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1219 1220# --------------------------------------------------------------------------- 1221# Devicetree files 1222 1223ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1224dtstree := arch/$(SRCARCH)/boot/dts 1225endif 1226 1227ifneq ($(dtstree),) 1228 1229%.dtb: prepare3 scripts_dtc 1230 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1231 1232PHONY += dtbs dtbs_install dt_binding_check 1233dtbs dtbs_check: prepare3 scripts_dtc 1234 $(Q)$(MAKE) $(build)=$(dtstree) 1235 1236dtbs_check: export CHECK_DTBS=1 1237dtbs_check: dt_binding_check 1238 1239dtbs_install: 1240 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1241 1242ifdef CONFIG_OF_EARLY_FLATTREE 1243all: dtbs 1244endif 1245 1246endif 1247 1248PHONY += scripts_dtc 1249scripts_dtc: scripts_basic 1250 $(Q)$(MAKE) $(build)=scripts/dtc 1251 1252dt_binding_check: scripts_dtc 1253 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1254 1255# --------------------------------------------------------------------------- 1256# Modules 1257 1258ifdef CONFIG_MODULES 1259 1260# By default, build modules as well 1261 1262all: modules 1263 1264# Build modules 1265# 1266# A module can be listed more than once in obj-m resulting in 1267# duplicate lines in modules.order files. Those are removed 1268# using awk while concatenating to the final file. 1269 1270PHONY += modules 1271modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1272 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1273 @$(kecho) ' Building modules, stage 2.'; 1274 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1275 1276modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1277 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1278 1279%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1280 $(Q)$(MAKE) $(modbuiltin)=$* 1281 1282 1283# Target to prepare building external modules 1284PHONY += modules_prepare 1285modules_prepare: prepare 1286 1287# Target to install modules 1288PHONY += modules_install 1289modules_install: _modinst_ _modinst_post 1290 1291PHONY += _modinst_ 1292_modinst_: 1293 @rm -rf $(MODLIB)/kernel 1294 @rm -f $(MODLIB)/source 1295 @mkdir -p $(MODLIB)/kernel 1296 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1297 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1298 rm -f $(MODLIB)/build ; \ 1299 ln -s $(CURDIR) $(MODLIB)/build ; \ 1300 fi 1301 @cp -f $(objtree)/modules.order $(MODLIB)/ 1302 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1304 1305# This depmod is only for convenience to give the initial 1306# boot a modules.dep even before / is mounted read-write. However the 1307# boot script depmod is the master version. 1308PHONY += _modinst_post 1309_modinst_post: _modinst_ 1310 $(call cmd,depmod) 1311 1312ifeq ($(CONFIG_MODULE_SIG), y) 1313PHONY += modules_sign 1314modules_sign: 1315 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1316endif 1317 1318else # CONFIG_MODULES 1319 1320# Modules not configured 1321# --------------------------------------------------------------------------- 1322 1323PHONY += modules modules_install 1324modules modules_install: 1325 @echo >&2 1326 @echo >&2 "The present kernel configuration has modules disabled." 1327 @echo >&2 "Type 'make config' and enable loadable module support." 1328 @echo >&2 "Then build a kernel with module support enabled." 1329 @echo >&2 1330 @exit 1 1331 1332endif # CONFIG_MODULES 1333 1334### 1335# Cleaning is done on three levels. 1336# make clean Delete most generated files 1337# Leave enough to build external modules 1338# make mrproper Delete the current configuration, and all generated files 1339# make distclean Remove editor backup files, patch leftover files and the like 1340 1341# Directories & files removed with 'make clean' 1342CLEAN_DIRS += $(MODVERDIR) include/ksym 1343 1344# Directories & files removed with 'make mrproper' 1345MRPROPER_DIRS += include/config usr/include include/generated \ 1346 arch/*/include/generated .tmp_objdiff 1347MRPROPER_FILES += .config .config.old .version \ 1348 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1349 signing_key.pem signing_key.priv signing_key.x509 \ 1350 x509.genkey extra_certificates signing_key.x509.keyid \ 1351 signing_key.x509.signer vmlinux-gdb.py 1352 1353# clean - Delete most, but leave enough to build external modules 1354# 1355clean: rm-dirs := $(CLEAN_DIRS) 1356clean: rm-files := $(CLEAN_FILES) 1357clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1358 1359PHONY += $(clean-dirs) clean archclean vmlinuxclean 1360$(clean-dirs): 1361 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1362 1363vmlinuxclean: 1364 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1365 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1366 1367clean: archclean vmlinuxclean 1368 1369# mrproper - Delete all generated files, including .config 1370# 1371mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1372mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1373mrproper-dirs := $(addprefix _mrproper_,scripts) 1374 1375PHONY += $(mrproper-dirs) mrproper archmrproper 1376$(mrproper-dirs): 1377 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1378 1379mrproper: clean archmrproper $(mrproper-dirs) 1380 $(call cmd,rmdirs) 1381 $(call cmd,rmfiles) 1382 1383# distclean 1384# 1385PHONY += distclean 1386 1387distclean: mrproper 1388 @find $(srctree) $(RCS_FIND_IGNORE) \ 1389 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1390 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1391 -o -name 'core' \) \ 1392 -type f -print | xargs rm -f 1393 1394 1395# Packaging of the kernel to various formats 1396# --------------------------------------------------------------------------- 1397package-dir := scripts/package 1398 1399%src-pkg: FORCE 1400 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1401%pkg: include/config/kernel.release FORCE 1402 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1403 1404 1405# Brief documentation of the typical targets used 1406# --------------------------------------------------------------------------- 1407 1408boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1409boards := $(sort $(notdir $(boards))) 1410board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1411board-dirs := $(sort $(notdir $(board-dirs:/=))) 1412 1413PHONY += help 1414help: 1415 @echo 'Cleaning targets:' 1416 @echo ' clean - Remove most generated files but keep the config and' 1417 @echo ' enough build support to build external modules' 1418 @echo ' mrproper - Remove all generated files + config + various backup files' 1419 @echo ' distclean - mrproper + remove editor backup and patch files' 1420 @echo '' 1421 @echo 'Configuration targets:' 1422 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1423 @echo '' 1424 @echo 'Other generic targets:' 1425 @echo ' all - Build all targets marked with [*]' 1426 @echo '* vmlinux - Build the bare kernel' 1427 @echo '* modules - Build all modules' 1428 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1429 @echo ' dir/ - Build all files in dir and below' 1430 @echo ' dir/file.[ois] - Build specified target only' 1431 @echo ' dir/file.ll - Build the LLVM assembly file' 1432 @echo ' (requires compiler support for LLVM assembly generation)' 1433 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1434 @echo ' (requires a recent binutils and recent build (System.map))' 1435 @echo ' dir/file.ko - Build module including final link' 1436 @echo ' modules_prepare - Set up for building external modules' 1437 @echo ' tags/TAGS - Generate tags file for editors' 1438 @echo ' cscope - Generate cscope index' 1439 @echo ' gtags - Generate GNU GLOBAL index' 1440 @echo ' kernelrelease - Output the release version string (use with make -s)' 1441 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1442 @echo ' image_name - Output the image name (use with make -s)' 1443 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1444 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1445 echo '' 1446 @echo 'Static analysers:' 1447 @echo ' checkstack - Generate a list of stack hogs' 1448 @echo ' namespacecheck - Name space analysis on compiled kernel' 1449 @echo ' versioncheck - Sanity check on version.h usage' 1450 @echo ' includecheck - Check for duplicate included header files' 1451 @echo ' export_report - List the usages of all exported symbols' 1452 @echo ' headers_check - Sanity check on exported headers' 1453 @echo ' headerdep - Detect inclusion cycles in headers' 1454 @echo ' coccicheck - Check with Coccinelle' 1455 @echo '' 1456 @echo 'Kernel selftest:' 1457 @echo ' kselftest - Build and run kernel selftest (run as root)' 1458 @echo ' Build, install, and boot kernel before' 1459 @echo ' running kselftest on it' 1460 @echo ' kselftest-clean - Remove all generated kselftest files' 1461 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1462 @echo ' .config.' 1463 @echo '' 1464 @$(if $(dtstree), \ 1465 echo 'Devicetree:'; \ 1466 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1467 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1468 echo '') 1469 1470 @echo 'Userspace tools targets:' 1471 @echo ' use "make tools/help"' 1472 @echo ' or "cd tools; make help"' 1473 @echo '' 1474 @echo 'Kernel packaging:' 1475 @$(MAKE) $(build)=$(package-dir) help 1476 @echo '' 1477 @echo 'Documentation targets:' 1478 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1479 @echo '' 1480 @echo 'Architecture specific targets ($(SRCARCH)):' 1481 @$(if $(archhelp),$(archhelp),\ 1482 echo ' No architecture specific help defined for $(SRCARCH)') 1483 @echo '' 1484 @$(if $(boards), \ 1485 $(foreach b, $(boards), \ 1486 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1487 echo '') 1488 @$(if $(board-dirs), \ 1489 $(foreach b, $(board-dirs), \ 1490 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1491 printf " %-16s - Show all of the above\\n" help-boards; \ 1492 echo '') 1493 1494 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1495 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1496 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1497 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1498 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1499 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1500 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1501 @echo ' 1: warnings which may be relevant and do not occur too often' 1502 @echo ' 2: warnings which occur quite often but may still be relevant' 1503 @echo ' 3: more obscure warnings, can most likely be ignored' 1504 @echo ' Multiple levels can be combined with W=12 or W=123' 1505 @echo '' 1506 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1507 @echo 'For further info see the ./README file' 1508 1509 1510help-board-dirs := $(addprefix help-,$(board-dirs)) 1511 1512help-boards: $(help-board-dirs) 1513 1514boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1515 1516$(help-board-dirs): help-%: 1517 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1518 @$(if $(boards-per-dir), \ 1519 $(foreach b, $(boards-per-dir), \ 1520 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1521 echo '') 1522 1523 1524# Documentation targets 1525# --------------------------------------------------------------------------- 1526DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1527 linkcheckdocs dochelp refcheckdocs 1528PHONY += $(DOC_TARGETS) 1529$(DOC_TARGETS): scripts_basic FORCE 1530 $(Q)$(MAKE) $(build)=Documentation $@ 1531 1532else # KBUILD_EXTMOD 1533 1534### 1535# External module support. 1536# When building external modules the kernel used as basis is considered 1537# read-only, and no consistency checks are made and the make 1538# system is not used on the basis kernel. If updates are required 1539# in the basis kernel ordinary make commands (without M=...) must 1540# be used. 1541# 1542# The following are the only valid targets when building external 1543# modules. 1544# make M=dir clean Delete all automatically generated files 1545# make M=dir modules Make all modules in specified dir 1546# make M=dir Same as 'make M=dir modules' 1547# make M=dir modules_install 1548# Install the modules built in the module directory 1549# Assumes install directory is already created 1550 1551# We are always building modules 1552KBUILD_MODULES := 1 1553 1554PHONY += $(objtree)/Module.symvers 1555$(objtree)/Module.symvers: 1556 @test -e $(objtree)/Module.symvers || ( \ 1557 echo; \ 1558 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1559 echo " is missing; modules will have no dependencies and modversions."; \ 1560 echo ) 1561 1562module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1563PHONY += $(module-dirs) modules 1564$(module-dirs): prepare $(objtree)/Module.symvers 1565 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1566 1567modules: $(module-dirs) 1568 @$(kecho) ' Building modules, stage 2.'; 1569 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1570 1571PHONY += modules_install 1572modules_install: _emodinst_ _emodinst_post 1573 1574install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1575PHONY += _emodinst_ 1576_emodinst_: 1577 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1578 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1579 1580PHONY += _emodinst_post 1581_emodinst_post: _emodinst_ 1582 $(call cmd,depmod) 1583 1584clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1585 1586PHONY += $(clean-dirs) clean 1587$(clean-dirs): 1588 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1589 1590clean: rm-dirs := $(MODVERDIR) 1591clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1592 1593PHONY += help 1594help: 1595 @echo ' Building external modules.' 1596 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1597 @echo '' 1598 @echo ' modules - default target, build the module(s)' 1599 @echo ' modules_install - install the module' 1600 @echo ' clean - remove generated files in module directory only' 1601 @echo '' 1602 1603PHONY += prepare 1604prepare: 1605 $(cmd_crmodverdir) 1606endif # KBUILD_EXTMOD 1607 1608clean: $(clean-dirs) 1609 $(call cmd,rmdirs) 1610 $(call cmd,rmfiles) 1611 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1612 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1613 -o -name '*.ko.*' \ 1614 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1615 -o -name '*.dwo' -o -name '*.lst' \ 1616 -o -name '*.su' \ 1617 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1618 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1619 -o -name '*.asn1.[ch]' \ 1620 -o -name '*.symtypes' -o -name 'modules.order' \ 1621 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1622 -o -name '*.c.[012]*.*' \ 1623 -o -name '*.ll' \ 1624 -o -name '*.gcno' \) -type f -print | xargs rm -f 1625 1626# Generate tags for editors 1627# --------------------------------------------------------------------------- 1628quiet_cmd_tags = GEN $@ 1629 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1630 1631tags TAGS cscope gtags: FORCE 1632 $(call cmd,tags) 1633 1634# Scripts to check various things for consistency 1635# --------------------------------------------------------------------------- 1636 1637PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1638 1639includecheck: 1640 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1641 -name '*.[hcS]' -type f -print | sort \ 1642 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1643 1644versioncheck: 1645 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1646 -name '*.[hcS]' -type f -print | sort \ 1647 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1648 1649coccicheck: 1650 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1651 1652namespacecheck: 1653 $(PERL) $(srctree)/scripts/namespace.pl 1654 1655export_report: 1656 $(PERL) $(srctree)/scripts/export_report.pl 1657 1658PHONY += checkstack kernelrelease kernelversion image_name 1659 1660# UML needs a little special treatment here. It wants to use the host 1661# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1662# else wants $(ARCH), including people doing cross-builds, which means 1663# that $(SUBARCH) doesn't work here. 1664ifeq ($(ARCH), um) 1665CHECKSTACK_ARCH := $(SUBARCH) 1666else 1667CHECKSTACK_ARCH := $(ARCH) 1668endif 1669checkstack: 1670 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1671 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1672 1673kernelrelease: 1674 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1675 1676kernelversion: 1677 @echo $(KERNELVERSION) 1678 1679image_name: 1680 @echo $(KBUILD_IMAGE) 1681 1682# Clear a bunch of variables before executing the submake 1683tools/: FORCE 1684 $(Q)mkdir -p $(objtree)/tools 1685 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1686 1687tools/%: FORCE 1688 $(Q)mkdir -p $(objtree)/tools 1689 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1690 1691# Single targets 1692# --------------------------------------------------------------------------- 1693# Single targets are compatible with: 1694# - build with mixed source and output 1695# - build with separate output dir 'make O=...' 1696# - external modules 1697# 1698# target-dir => where to store outputfile 1699# build-dir => directory in kernel source tree to use 1700 1701ifeq ($(KBUILD_EXTMOD),) 1702 build-dir = $(patsubst %/,%,$(dir $@)) 1703 target-dir = $(dir $@) 1704else 1705 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1706 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1707 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1708endif 1709 1710%.s: %.c prepare FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712%.i: %.c prepare FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1714%.o: %.c prepare FORCE 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1716%.lst: %.c prepare FORCE 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1718%.s: %.S prepare FORCE 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1720%.o: %.S prepare FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1722%.symtypes: %.c prepare FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1724%.ll: %.c prepare FORCE 1725 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1726 1727# Modules 1728/: prepare FORCE 1729 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1730 $(build)=$(build-dir) 1731# Make sure the latest headers are built for Documentation 1732Documentation/ samples/: headers_install 1733%/: prepare FORCE 1734 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1735 $(build)=$(build-dir) 1736%.ko: prepare FORCE 1737 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1738 $(build)=$(build-dir) $(@:.ko=.o) 1739 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1740 1741# FIXME Should go into a make.lib or something 1742# =========================================================================== 1743 1744quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1745 cmd_rmdirs = rm -rf $(rm-dirs) 1746 1747quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1748 cmd_rmfiles = rm -f $(rm-files) 1749 1750# Run depmod only if we have System.map and depmod is executable 1751quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1752 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1753 $(KERNELRELEASE) 1754 1755# Create temporary dir for module support files 1756# clean it up only when building all modules 1757cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1758 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1759 1760# read saved command lines for existing targets 1761existing-targets := $(wildcard $(sort $(targets))) 1762 1763cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1764$(cmd_files): ; # Do not try to update included dependency files 1765-include $(cmd_files) 1766 1767endif # ifeq ($(config-targets),1) 1768endif # ifeq ($(mixed-targets),1) 1769endif # skip-makefile 1770 1771PHONY += FORCE 1772FORCE: 1773 1774# Declare the contents of the PHONY variable as phony. We keep that 1775# information in a variable so we can use it in if_changed and friends. 1776.PHONY: $(PHONY) 1777