1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 19 4SUBLEVEL = 155 5EXTRAVERSION = 6NAME = "People's Front" 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# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.a targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 %asm-generic kernelversion %src-pkg 228no-sync-config-targets := $(no-dot-config-targets) install %install \ 229 kernelrelease 230 231config-targets := 0 232mixed-targets := 0 233dot-config := 1 234may-sync-config := 1 235 236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 237 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 238 dot-config := 0 239 endif 240endif 241 242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 244 may-sync-config := 0 245 endif 246endif 247 248ifneq ($(KBUILD_EXTMOD),) 249 may-sync-config := 0 250endif 251 252ifeq ($(KBUILD_EXTMOD),) 253 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 254 config-targets := 1 255 ifneq ($(words $(MAKECMDGOALS)),1) 256 mixed-targets := 1 257 endif 258 endif 259endif 260 261# For "make -j clean all", "make -j mrproper defconfig all", etc. 262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 263 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 264 mixed-targets := 1 265 endif 266endif 267 268# install and modules_install need also be processed one by one 269ifneq ($(filter install,$(MAKECMDGOALS)),) 270 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 271 mixed-targets := 1 272 endif 273endif 274 275ifeq ($(mixed-targets),1) 276# =========================================================================== 277# We're called with mixed targets (*config and build targets). 278# Handle them one by one. 279 280PHONY += $(MAKECMDGOALS) __build_one_by_one 281 282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 283 @: 284 285__build_one_by_one: 286 $(Q)set -e; \ 287 for i in $(MAKECMDGOALS); do \ 288 $(MAKE) -f $(srctree)/Makefile $$i; \ 289 done 290 291else 292 293# We need some generic definitions (do not try to remake the file). 294scripts/Kbuild.include: ; 295include scripts/Kbuild.include 296 297# Read KERNELRELEASE from include/config/kernel.release (if it exists) 298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 301 302include scripts/subarch.include 303 304# Cross compiling and selecting different set of gcc/bin-utils 305# --------------------------------------------------------------------------- 306# 307# When performing cross compilation for other architectures ARCH shall be set 308# to the target architecture. (See arch/* for the possibilities). 309# ARCH can be set during invocation of make: 310# make ARCH=ia64 311# Another way is to have ARCH set in the environment. 312# The default ARCH is the host where make is executed. 313 314# CROSS_COMPILE specify the prefix used for all executables used 315# during compilation. Only gcc and related bin-utils executables 316# are prefixed with $(CROSS_COMPILE). 317# CROSS_COMPILE can be set on the command line 318# make CROSS_COMPILE=ia64-linux- 319# Alternatively CROSS_COMPILE can be set in the environment. 320# Default value for CROSS_COMPILE is not to prefix executables 321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 322ARCH ?= $(SUBARCH) 323 324# Architecture as present in compile.h 325UTS_MACHINE := $(ARCH) 326SRCARCH := $(ARCH) 327 328# Additional ARCH settings for x86 329ifeq ($(ARCH),i386) 330 SRCARCH := x86 331endif 332ifeq ($(ARCH),x86_64) 333 SRCARCH := x86 334endif 335 336# Additional ARCH settings for sparc 337ifeq ($(ARCH),sparc32) 338 SRCARCH := sparc 339endif 340ifeq ($(ARCH),sparc64) 341 SRCARCH := sparc 342endif 343 344# Additional ARCH settings for sh 345ifeq ($(ARCH),sh64) 346 SRCARCH := sh 347endif 348 349KCONFIG_CONFIG ?= .config 350export KCONFIG_CONFIG 351 352# SHELL used by kbuild 353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 354 else if [ -x /bin/bash ]; then echo /bin/bash; \ 355 else echo sh; fi ; fi) 356 357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 359HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 360 361ifneq ($(LLVM),) 362HOSTCC = clang 363HOSTCXX = clang++ 364else 365HOSTCC = gcc 366HOSTCXX = g++ 367endif 368KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 369 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 370 $(HOSTCFLAGS) 371KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 372KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 373KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 374 375# Make variables (CC, etc...) 376CPP = $(CC) -E 377ifneq ($(LLVM),) 378CC = clang 379LD = ld.lld 380AR = llvm-ar 381NM = llvm-nm 382OBJCOPY = llvm-objcopy 383OBJDUMP = llvm-objdump 384READELF = llvm-readelf 385OBJSIZE = llvm-size 386STRIP = llvm-strip 387else 388CC = $(CROSS_COMPILE)gcc 389LD = $(CROSS_COMPILE)ld 390AR = $(CROSS_COMPILE)ar 391NM = $(CROSS_COMPILE)nm 392OBJCOPY = $(CROSS_COMPILE)objcopy 393OBJDUMP = $(CROSS_COMPILE)objdump 394READELF = $(CROSS_COMPILE)readelf 395OBJSIZE = $(CROSS_COMPILE)size 396STRIP = $(CROSS_COMPILE)strip 397endif 398LEX = flex 399YACC = bison 400AWK = awk 401GENKSYMS = scripts/genksyms/genksyms 402INSTALLKERNEL := installkernel 403DEPMOD = /sbin/depmod 404PERL = perl 405PYTHON = python 406PYTHON2 = python2 407PYTHON3 = python3 408CHECK = sparse 409 410CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 411 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 412NOSTDINC_FLAGS = 413CFLAGS_MODULE = 414AFLAGS_MODULE = 415LDFLAGS_MODULE = 416CFLAGS_KERNEL = 417AFLAGS_KERNEL = 418LDFLAGS_vmlinux = 419 420# Use USERINCLUDE when you must reference the UAPI directories only. 421USERINCLUDE := \ 422 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 423 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 424 -I$(srctree)/include/uapi \ 425 -I$(objtree)/include/generated/uapi \ 426 -include $(srctree)/include/linux/kconfig.h 427 428# Use LINUXINCLUDE when you must reference the include/ directory. 429# Needed to be compatible with the O= option 430LINUXINCLUDE := \ 431 -I$(srctree)/arch/$(SRCARCH)/include \ 432 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 433 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 434 -I$(objtree)/include \ 435 $(USERINCLUDE) 436 437KBUILD_AFLAGS := -D__ASSEMBLY__ 438KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 439 -fno-strict-aliasing -fno-common -fshort-wchar \ 440 -Werror-implicit-function-declaration \ 441 -Wno-format-security \ 442 -std=gnu89 443KBUILD_CPPFLAGS := -D__KERNEL__ 444KBUILD_AFLAGS_KERNEL := 445KBUILD_CFLAGS_KERNEL := 446KBUILD_AFLAGS_MODULE := -DMODULE 447KBUILD_CFLAGS_MODULE := -DMODULE 448KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 449KBUILD_LDFLAGS := 450GCC_PLUGINS_CFLAGS := 451CLANG_FLAGS := 452 453export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 454export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 455export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 456export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 457 458export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 459export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 460export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 461export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 462export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 463export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 464export KBUILD_ARFLAGS 465 466# When compiling out-of-tree modules, put MODVERDIR in the module 467# tree rather than in the kernel tree. The kernel tree might 468# even be read-only. 469export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 470 471# Files to ignore in find ... statements 472 473export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 474 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 475 -prune -o 476export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 477 --exclude CVS --exclude .pc --exclude .hg --exclude .git 478 479# =========================================================================== 480# Rules shared between *config targets and build targets 481 482# Basic helpers built in scripts/basic/ 483PHONY += scripts_basic 484scripts_basic: 485 $(Q)$(MAKE) $(build)=scripts/basic 486 $(Q)rm -f .tmp_quiet_recordmcount 487 488# To avoid any implicit rule to kick in, define an empty command. 489scripts/basic/%: scripts_basic ; 490 491PHONY += outputmakefile 492# outputmakefile generates a Makefile in the output directory, if using a 493# separate output directory. This allows convenient use of make in the 494# output directory. 495outputmakefile: 496ifneq ($(KBUILD_SRC),) 497 $(Q)ln -fsn $(srctree) source 498 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 499 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 500endif 501 502ifeq ($(cc-name),clang) 503ifneq ($(CROSS_COMPILE),) 504CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 505GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 506CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 507GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 508endif 509ifneq ($(GCC_TOOLCHAIN),) 510CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 511endif 512ifneq ($(LLVM_IAS),1) 513CLANG_FLAGS += -no-integrated-as 514endif 515CLANG_FLAGS += -Werror=unknown-warning-option 516KBUILD_CFLAGS += $(CLANG_FLAGS) 517KBUILD_AFLAGS += $(CLANG_FLAGS) 518export CLANG_FLAGS 519endif 520 521RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 522RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 523RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 524RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 525RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 526RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 527export RETPOLINE_CFLAGS 528export RETPOLINE_VDSO_CFLAGS 529 530KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 531KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 532 533# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 534# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 535# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 536# and from include/config/auto.conf.cmd to detect the compiler upgrade. 537CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 538 539ifeq ($(config-targets),1) 540# =========================================================================== 541# *config targets only - make sure prerequisites are updated, and descend 542# in scripts/kconfig to make the *config target 543 544# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 545# KBUILD_DEFCONFIG may point out an alternative default configuration 546# used for 'make defconfig' 547include arch/$(SRCARCH)/Makefile 548export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 549 550config: scripts_basic outputmakefile FORCE 551 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 552 553%config: scripts_basic outputmakefile FORCE 554 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 555 556else 557# =========================================================================== 558# Build targets only - this includes vmlinux, arch specific targets, clean 559# targets and others. In general all targets except *config targets. 560 561# If building an external module we do not care about the all: rule 562# but instead _all depend on modules 563PHONY += all 564ifeq ($(KBUILD_EXTMOD),) 565_all: all 566else 567_all: modules 568endif 569 570# Decide whether to build built-in, modular, or both. 571# Normally, just do built-in. 572 573KBUILD_MODULES := 574KBUILD_BUILTIN := 1 575 576# If we have only "make modules", don't compile built-in objects. 577ifeq ($(MAKECMDGOALS),modules) 578 KBUILD_BUILTIN := 579endif 580 581# If we have "make <whatever> modules", compile modules 582# in addition to whatever we do anyway. 583# Just "make" or "make all" shall build modules as well 584 585ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 586 KBUILD_MODULES := 1 587endif 588 589ifeq ($(MAKECMDGOALS),) 590 KBUILD_MODULES := 1 591endif 592 593export KBUILD_MODULES KBUILD_BUILTIN 594 595ifeq ($(KBUILD_EXTMOD),) 596# Objects we will link into vmlinux / subdirs we need to visit 597init-y := init/ 598drivers-y := drivers/ sound/ firmware/ 599net-y := net/ 600libs-y := lib/ 601core-y := usr/ 602virt-y := virt/ 603endif # KBUILD_EXTMOD 604 605ifeq ($(dot-config),1) 606include include/config/auto.conf 607endif 608 609# The all: target is the default when no target is given on the 610# command line. 611# This allow a user to issue only 'make' to build a kernel including modules 612# Defaults to vmlinux, but the arch makefile usually adds further targets 613all: vmlinux 614 615CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 616 $(call cc-option,-fno-tree-loop-im) \ 617 $(call cc-disable-warning,maybe-uninitialized,) 618export CFLAGS_GCOV 619 620# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 621ifdef CONFIG_FUNCTION_TRACER 622 CC_FLAGS_FTRACE := -pg 623endif 624 625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 626# values of the respective KBUILD_* variables 627ARCH_CPPFLAGS := 628ARCH_AFLAGS := 629ARCH_CFLAGS := 630include arch/$(SRCARCH)/Makefile 631 632ifeq ($(dot-config),1) 633ifeq ($(may-sync-config),1) 634# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 635# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 636# because some architectures define CROSS_COMPILE there. 637include include/config/auto.conf.cmd 638 639# To avoid any implicit rule to kick in, define an empty command 640$(KCONFIG_CONFIG): ; 641 642# The actual configuration files used during the build are stored in 643# include/generated/ and include/config/. Update them if .config is newer than 644# include/config/auto.conf (which mirrors .config). 645# 646# This exploits the 'multi-target pattern rule' trick. 647# The syncconfig should be executed only once to make all the targets. 648%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 649 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 650else 651# External modules and some install targets need include/generated/autoconf.h 652# and include/config/auto.conf but do not care if they are up-to-date. 653# Use auto.conf to trigger the test 654PHONY += include/config/auto.conf 655 656include/config/auto.conf: 657 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 658 echo >&2; \ 659 echo >&2 " ERROR: Kernel configuration is invalid."; \ 660 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 661 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 662 echo >&2 ; \ 663 /bin/false) 664 665endif # may-sync-config 666endif # $(dot-config) 667 668KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 669KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 670KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 671KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 672KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 673KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 674 675ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 676KBUILD_CFLAGS += -Os 677else 678KBUILD_CFLAGS += -O2 679endif 680 681# Tell gcc to never replace conditional load with a non-conditional one 682KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 683KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 684 685include scripts/Makefile.kcov 686include scripts/Makefile.gcc-plugins 687 688ifdef CONFIG_READABLE_ASM 689# Disable optimizations that make assembler listings hard to read. 690# reorder blocks reorders the control in the function 691# ipa clone creates specialized cloned functions 692# partial inlining inlines only parts of functions 693KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 694 $(call cc-option,-fno-ipa-cp-clone,) \ 695 $(call cc-option,-fno-partial-inlining) 696endif 697 698ifneq ($(CONFIG_FRAME_WARN),0) 699KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 700endif 701 702stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 703stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 704stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 705 706KBUILD_CFLAGS += $(stackp-flags-y) 707 708ifeq ($(cc-name),clang) 709KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 710KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 711KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 712# Quiet clang warning: comparison of unsigned expression < 0 is always false 713KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 714# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 715# source of a reference will be _MergedGlobals and not on of the whitelisted names. 716# See modpost pattern 2 717KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 718KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 719else 720 721# These warnings generated too much noise in a regular build. 722# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 723KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 724endif 725 726KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 727ifdef CONFIG_FRAME_POINTER 728KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 729else 730# Some targets (ARM with Thumb2, for example), can't be built with frame 731# pointers. For those, we don't have FUNCTION_TRACER automatically 732# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 733# incompatible with -fomit-frame-pointer with current GCC, so we don't use 734# -fomit-frame-pointer with FUNCTION_TRACER. 735ifndef CONFIG_FUNCTION_TRACER 736KBUILD_CFLAGS += -fomit-frame-pointer 737endif 738endif 739 740KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 741 742ifdef CONFIG_DEBUG_INFO 743ifdef CONFIG_DEBUG_INFO_SPLIT 744KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 745else 746KBUILD_CFLAGS += -g 747endif 748KBUILD_AFLAGS += -Wa,-gdwarf-2 749endif 750ifdef CONFIG_DEBUG_INFO_DWARF4 751KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 752endif 753 754ifdef CONFIG_DEBUG_INFO_REDUCED 755KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 756 $(call cc-option,-fno-var-tracking) 757endif 758 759ifdef CONFIG_FUNCTION_TRACER 760ifdef CONFIG_FTRACE_MCOUNT_RECORD 761 # gcc 5 supports generating the mcount tables directly 762 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 763 CC_FLAGS_FTRACE += -mrecord-mcount 764 export CC_USING_RECORD_MCOUNT := 1 765 endif 766 ifdef CONFIG_HAVE_NOP_MCOUNT 767 ifeq ($(call cc-option-yn, -mnop-mcount),y) 768 CC_FLAGS_FTRACE += -mnop-mcount 769 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 770 endif 771 endif 772endif 773ifdef CONFIG_HAVE_FENTRY 774 ifeq ($(call cc-option-yn, -mfentry),y) 775 CC_FLAGS_FTRACE += -mfentry 776 CC_FLAGS_USING += -DCC_USING_FENTRY 777 endif 778endif 779export CC_FLAGS_FTRACE 780KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 781KBUILD_AFLAGS += $(CC_FLAGS_USING) 782ifdef CONFIG_DYNAMIC_FTRACE 783 ifdef CONFIG_HAVE_C_RECORDMCOUNT 784 BUILD_C_RECORDMCOUNT := y 785 export BUILD_C_RECORDMCOUNT 786 endif 787endif 788endif 789 790# We trigger additional mismatches with less inlining 791ifdef CONFIG_DEBUG_SECTION_MISMATCH 792KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 793endif 794 795ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 796KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 797LDFLAGS_vmlinux += --gc-sections 798endif 799 800# arch Makefile may override CC so keep this after arch Makefile is included 801NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 802 803# warn about C99 declaration after statement 804KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 805 806# disable pointer signed / unsigned warnings in gcc 4.0 807KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 808 809# disable stringop warnings in gcc 8+ 810KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 811 812# We'll want to enable this eventually, but it's not going away for 5.7 at least 813KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 814KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 815KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 816 817# Another good warning that we'll want to enable eventually 818KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 819 820# Enabled with W=2, disabled by default as noisy 821KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 822 823# disable invalid "can't wrap" optimizations for signed / pointers 824KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 825 826# clang sets -fmerge-all-constants by default as optimization, but this 827# is non-conforming behavior for C and in fact breaks the kernel, so we 828# need to disable it here generally. 829KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 830 831# for gcc -fno-merge-all-constants disables everything, but it is fine 832# to have actual conforming behavior enabled. 833KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 834 835# Make sure -fstack-check isn't enabled (like gentoo apparently did) 836KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 837 838# conserve stack if available 839KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 840 841# disallow errors like 'EXPORT_GPL(foo);' with missing header 842KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 843 844# require functions to have arguments in prototypes, not empty 'int foo()' 845KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 846 847# Prohibit date/time macros, which would make the build non-deterministic 848KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 849 850# enforce correct pointer usage 851KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 852 853# Require designated initializers for all marked structures 854KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 855 856# change __FILE__ to the relative path from the srctree 857KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 858 859# ensure -fcf-protection is disabled when using retpoline as it is 860# incompatible with -mindirect-branch=thunk-extern 861ifdef CONFIG_RETPOLINE 862KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 863endif 864 865# use the deterministic mode of AR if available 866KBUILD_ARFLAGS := $(call ar-option,D) 867 868include scripts/Makefile.kasan 869include scripts/Makefile.extrawarn 870include scripts/Makefile.ubsan 871 872# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 873# last assignments 874KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 875KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 876KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 877 878# Use --build-id when available. 879LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 880KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 881LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 882 883ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 884LDFLAGS_vmlinux += $(call ld-option, -X,) 885endif 886 887# insure the checker run with the right endianness 888CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 889 890# the checker needs the correct machine size 891CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 892 893# Default kernel image to build when no specific target is given. 894# KBUILD_IMAGE may be overruled on the command line or 895# set in the environment 896# Also any assignments in arch/$(ARCH)/Makefile take precedence over 897# this default value 898export KBUILD_IMAGE ?= vmlinux 899 900# 901# INSTALL_PATH specifies where to place the updated kernel and system map 902# images. Default is /boot, but you can set it to other values 903export INSTALL_PATH ?= /boot 904 905# 906# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 907# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 908# an argument if needed. Otherwise it defaults to the kernel install path 909# 910export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 911 912# 913# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 914# relocations required by build roots. This is not defined in the 915# makefile but the argument can be passed to make if needed. 916# 917 918MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 919export MODLIB 920 921# 922# INSTALL_MOD_STRIP, if defined, will cause modules to be 923# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 924# the default option --strip-debug will be used. Otherwise, 925# INSTALL_MOD_STRIP value will be used as the options to the strip command. 926 927ifdef INSTALL_MOD_STRIP 928ifeq ($(INSTALL_MOD_STRIP),1) 929mod_strip_cmd = $(STRIP) --strip-debug 930else 931mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 932endif # INSTALL_MOD_STRIP=1 933else 934mod_strip_cmd = true 935endif # INSTALL_MOD_STRIP 936export mod_strip_cmd 937 938# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 939# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 940# or CONFIG_MODULE_COMPRESS_XZ. 941 942mod_compress_cmd = true 943ifdef CONFIG_MODULE_COMPRESS 944 ifdef CONFIG_MODULE_COMPRESS_GZIP 945 mod_compress_cmd = gzip -n -f 946 endif # CONFIG_MODULE_COMPRESS_GZIP 947 ifdef CONFIG_MODULE_COMPRESS_XZ 948 mod_compress_cmd = xz -f 949 endif # CONFIG_MODULE_COMPRESS_XZ 950endif # CONFIG_MODULE_COMPRESS 951export mod_compress_cmd 952 953# Select initial ramdisk compression format, default is gzip(1). 954# This shall be used by the dracut(8) tool while creating an initramfs image. 955# 956INITRD_COMPRESS-y := gzip 957INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 958INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 959INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 960INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 961INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 962# do not export INITRD_COMPRESS, since we didn't actually 963# choose a sane default compression above. 964# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 965 966ifdef CONFIG_MODULE_SIG_ALL 967$(eval $(call config_filename,MODULE_SIG_KEY)) 968 969mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 970else 971mod_sign_cmd = true 972endif 973export mod_sign_cmd 974 975HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 976 977ifdef CONFIG_STACK_VALIDATION 978 has_libelf := $(call try-run,\ 979 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 980 ifeq ($(has_libelf),1) 981 objtool_target := tools/objtool FORCE 982 else 983 SKIP_STACK_VALIDATION := 1 984 export SKIP_STACK_VALIDATION 985 endif 986endif 987 988PHONY += prepare0 989 990ifeq ($(KBUILD_EXTMOD),) 991core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 992 993vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 994 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 995 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 996 997vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 998 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 999 1000init-y := $(patsubst %/, %/built-in.a, $(init-y)) 1001core-y := $(patsubst %/, %/built-in.a, $(core-y)) 1002drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1003net-y := $(patsubst %/, %/built-in.a, $(net-y)) 1004libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1005libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1006virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1007 1008# Externally visible symbols (used by link-vmlinux.sh) 1009export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 1010export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 1011export KBUILD_VMLINUX_LIBS := $(libs-y1) 1012export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1013export LDFLAGS_vmlinux 1014# used by scripts/package/Makefile 1015export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1016 1017vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1018 1019# Recurse until adjust_autoksyms.sh is satisfied 1020PHONY += autoksyms_recursive 1021autoksyms_recursive: $(vmlinux-deps) 1022ifdef CONFIG_TRIM_UNUSED_KSYMS 1023 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1024 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1025endif 1026 1027# For the kernel to actually contain only the needed exported symbols, 1028# we have to build modules as well to determine what those symbols are. 1029# (this can be evaluated only once include/config/auto.conf has been included) 1030ifdef CONFIG_TRIM_UNUSED_KSYMS 1031 KBUILD_MODULES := 1 1032endif 1033 1034autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1035 1036$(autoksyms_h): 1037 $(Q)mkdir -p $(dir $@) 1038 $(Q)touch $@ 1039 1040ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1041 1042# Final link of vmlinux with optional arch pass after final link 1043cmd_link-vmlinux = \ 1044 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1045 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1046 1047vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1048ifdef CONFIG_HEADERS_CHECK 1049 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1050endif 1051ifdef CONFIG_GDB_SCRIPTS 1052 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1053endif 1054 +$(call if_changed,link-vmlinux) 1055 1056# Build samples along the rest of the kernel. This needs headers_install. 1057ifdef CONFIG_SAMPLES 1058vmlinux-dirs += samples 1059samples: headers_install 1060endif 1061 1062# The actual objects are generated when descending, 1063# make sure no implicit rule kicks in 1064$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1065 1066# Handle descending into subdirectories listed in $(vmlinux-dirs) 1067# Preset locale variables to speed up the build process. Limit locale 1068# tweaks to this spot to avoid wrong language settings when running 1069# make menuconfig etc. 1070# Error messages still appears in the original language 1071 1072PHONY += $(vmlinux-dirs) 1073$(vmlinux-dirs): prepare scripts 1074 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1075 1076define filechk_kernel.release 1077 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1078endef 1079 1080# Store (new) KERNELRELEASE string in include/config/kernel.release 1081include/config/kernel.release: $(srctree)/Makefile FORCE 1082 $(call filechk,kernel.release) 1083 1084# Additional helpers built in scripts/ 1085# Carefully list dependencies so we do not try to build scripts twice 1086# in parallel 1087PHONY += scripts 1088scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) 1089 $(Q)$(MAKE) $(build)=$(@) 1090 1091# Things we need to do before we recursively start building the kernel 1092# or the modules are listed in "prepare". 1093# A multi level approach is used. prepareN is processed before prepareN-1. 1094# archprepare is used in arch Makefiles and when processed asm symlink, 1095# version.h and scripts_basic is processed / created. 1096 1097PHONY += prepare archprepare prepare1 prepare2 prepare3 1098 1099# prepare3 is used to check if we are building in a separate output directory, 1100# and if so do: 1101# 1) Check that make has not been executed in the kernel src $(srctree) 1102prepare3: include/config/kernel.release 1103ifneq ($(KBUILD_SRC),) 1104 @$(kecho) ' Using $(srctree) as source for kernel' 1105 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1106 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1107 echo >&2 " in the '$(srctree)' directory.";\ 1108 /bin/false; \ 1109 fi; 1110endif 1111 1112# prepare2 creates a makefile if using a separate output directory. 1113# From this point forward, .config has been reprocessed, so any rules 1114# that need to depend on updated CONFIG_* values can be checked here. 1115prepare2: prepare3 outputmakefile asm-generic 1116 1117prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1118 $(cmd_crmodverdir) 1119 1120archprepare: archheaders archscripts prepare1 scripts_basic 1121 1122prepare0: archprepare gcc-plugins 1123 $(Q)$(MAKE) $(build)=. 1124 1125# All the preparing.. 1126prepare: prepare0 prepare-objtool 1127 1128# Support for using generic headers in asm-generic 1129PHONY += asm-generic uapi-asm-generic 1130asm-generic: uapi-asm-generic 1131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1132 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1133uapi-asm-generic: 1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1135 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1136 1137PHONY += prepare-objtool 1138prepare-objtool: $(objtool_target) 1139ifeq ($(SKIP_STACK_VALIDATION),1) 1140ifdef CONFIG_UNWINDER_ORC 1141 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1142 @false 1143else 1144 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1145endif 1146endif 1147 1148# Generate some files 1149# --------------------------------------------------------------------------- 1150 1151# KERNELRELEASE can change from a few different places, meaning version.h 1152# needs to be updated, so this check is forced on all builds 1153 1154uts_len := 64 1155define filechk_utsrelease.h 1156 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1157 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1158 exit 1; \ 1159 fi; \ 1160 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1161endef 1162 1163define filechk_version.h 1164 (echo \#define LINUX_VERSION_CODE $(shell \ 1165 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1166 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1167endef 1168 1169$(version_h): FORCE 1170 $(call filechk,version.h) 1171 $(Q)rm -f $(old_version_h) 1172 1173include/generated/utsrelease.h: include/config/kernel.release FORCE 1174 $(call filechk,utsrelease.h) 1175 1176PHONY += headerdep 1177headerdep: 1178 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1179 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1180 1181# --------------------------------------------------------------------------- 1182# Kernel headers 1183 1184#Default location for installed headers 1185export INSTALL_HDR_PATH = $(objtree)/usr 1186 1187# If we do an all arch process set dst to include/arch-$(SRCARCH) 1188hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1189 1190PHONY += archheaders 1191archheaders: 1192 1193PHONY += archscripts 1194archscripts: 1195 1196PHONY += __headers 1197__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1198 $(Q)$(MAKE) $(build)=scripts build_unifdef 1199 1200PHONY += headers_install_all 1201headers_install_all: 1202 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1203 1204PHONY += headers_install 1205headers_install: __headers 1206 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1207 $(error Headers not exportable for the $(SRCARCH) architecture)) 1208 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1209 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1210 1211PHONY += headers_check_all 1212headers_check_all: headers_install_all 1213 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1214 1215PHONY += headers_check 1216headers_check: headers_install 1217 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1218 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1219 1220# --------------------------------------------------------------------------- 1221# Kernel selftest 1222 1223PHONY += kselftest 1224kselftest: 1225 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1226 1227PHONY += kselftest-clean 1228kselftest-clean: 1229 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1230 1231PHONY += kselftest-merge 1232kselftest-merge: 1233 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1234 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1235 -m $(objtree)/.config \ 1236 $(srctree)/tools/testing/selftests/*/config 1237 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1238 1239# --------------------------------------------------------------------------- 1240# Modules 1241 1242ifdef CONFIG_MODULES 1243 1244# By default, build modules as well 1245 1246all: modules 1247 1248# When we're building modules with modversions, we need to consider 1249# the built-in objects during the descend as well, in order to 1250# make sure the checksums are up to date before we record them. 1251ifdef CONFIG_MODVERSIONS 1252 KBUILD_BUILTIN := 1 1253endif 1254 1255# Build modules 1256# 1257# A module can be listed more than once in obj-m resulting in 1258# duplicate lines in modules.order files. Those are removed 1259# using awk while concatenating to the final file. 1260 1261PHONY += modules 1262modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1263 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1264 @$(kecho) ' Building modules, stage 2.'; 1265 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1266 1267modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1268 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1269 1270%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1271 $(Q)$(MAKE) $(modbuiltin)=$* 1272 1273 1274# Target to prepare building external modules 1275PHONY += modules_prepare 1276modules_prepare: prepare scripts 1277 1278# Target to install modules 1279PHONY += modules_install 1280modules_install: _modinst_ _modinst_post 1281 1282PHONY += _modinst_ 1283_modinst_: 1284 @rm -rf $(MODLIB)/kernel 1285 @rm -f $(MODLIB)/source 1286 @mkdir -p $(MODLIB)/kernel 1287 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1288 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1289 rm -f $(MODLIB)/build ; \ 1290 ln -s $(CURDIR) $(MODLIB)/build ; \ 1291 fi 1292 @cp -f $(objtree)/modules.order $(MODLIB)/ 1293 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1294 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1295 1296# This depmod is only for convenience to give the initial 1297# boot a modules.dep even before / is mounted read-write. However the 1298# boot script depmod is the master version. 1299PHONY += _modinst_post 1300_modinst_post: _modinst_ 1301 $(call cmd,depmod) 1302 1303ifeq ($(CONFIG_MODULE_SIG), y) 1304PHONY += modules_sign 1305modules_sign: 1306 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1307endif 1308 1309else # CONFIG_MODULES 1310 1311# Modules not configured 1312# --------------------------------------------------------------------------- 1313 1314PHONY += modules modules_install 1315modules modules_install: 1316 @echo >&2 1317 @echo >&2 "The present kernel configuration has modules disabled." 1318 @echo >&2 "Type 'make config' and enable loadable module support." 1319 @echo >&2 "Then build a kernel with module support enabled." 1320 @echo >&2 1321 @exit 1 1322 1323endif # CONFIG_MODULES 1324 1325### 1326# Cleaning is done on three levels. 1327# make clean Delete most generated files 1328# Leave enough to build external modules 1329# make mrproper Delete the current configuration, and all generated files 1330# make distclean Remove editor backup files, patch leftover files and the like 1331 1332# Directories & files removed with 'make clean' 1333CLEAN_DIRS += $(MODVERDIR) include/ksym 1334 1335# Directories & files removed with 'make mrproper' 1336MRPROPER_DIRS += include/config usr/include include/generated \ 1337 arch/*/include/generated .tmp_objdiff 1338MRPROPER_FILES += .config .config.old .version \ 1339 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1340 signing_key.pem signing_key.priv signing_key.x509 \ 1341 x509.genkey extra_certificates signing_key.x509.keyid \ 1342 signing_key.x509.signer vmlinux-gdb.py 1343 1344# clean - Delete most, but leave enough to build external modules 1345# 1346clean: rm-dirs := $(CLEAN_DIRS) 1347clean: rm-files := $(CLEAN_FILES) 1348clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1349 1350PHONY += $(clean-dirs) clean archclean vmlinuxclean 1351$(clean-dirs): 1352 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1353 1354vmlinuxclean: 1355 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1356 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1357 1358clean: archclean vmlinuxclean 1359 1360# mrproper - Delete all generated files, including .config 1361# 1362mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1363mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1364mrproper-dirs := $(addprefix _mrproper_,scripts) 1365 1366PHONY += $(mrproper-dirs) mrproper archmrproper 1367$(mrproper-dirs): 1368 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1369 1370mrproper: clean archmrproper $(mrproper-dirs) 1371 $(call cmd,rmdirs) 1372 $(call cmd,rmfiles) 1373 1374# distclean 1375# 1376PHONY += distclean 1377 1378distclean: mrproper 1379 @find $(srctree) $(RCS_FIND_IGNORE) \ 1380 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1381 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1382 -o -name 'core' \) \ 1383 -type f -print | xargs rm -f 1384 1385 1386# Packaging of the kernel to various formats 1387# --------------------------------------------------------------------------- 1388package-dir := scripts/package 1389 1390%src-pkg: FORCE 1391 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1392%pkg: include/config/kernel.release FORCE 1393 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1394 1395 1396# Brief documentation of the typical targets used 1397# --------------------------------------------------------------------------- 1398 1399boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1400boards := $(sort $(notdir $(boards))) 1401board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1402board-dirs := $(sort $(notdir $(board-dirs:/=))) 1403 1404PHONY += help 1405help: 1406 @echo 'Cleaning targets:' 1407 @echo ' clean - Remove most generated files but keep the config and' 1408 @echo ' enough build support to build external modules' 1409 @echo ' mrproper - Remove all generated files + config + various backup files' 1410 @echo ' distclean - mrproper + remove editor backup and patch files' 1411 @echo '' 1412 @echo 'Configuration targets:' 1413 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1414 @echo '' 1415 @echo 'Other generic targets:' 1416 @echo ' all - Build all targets marked with [*]' 1417 @echo '* vmlinux - Build the bare kernel' 1418 @echo '* modules - Build all modules' 1419 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1420 @echo ' dir/ - Build all files in dir and below' 1421 @echo ' dir/file.[ois] - Build specified target only' 1422 @echo ' dir/file.ll - Build the LLVM assembly file' 1423 @echo ' (requires compiler support for LLVM assembly generation)' 1424 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1425 @echo ' (requires a recent binutils and recent build (System.map))' 1426 @echo ' dir/file.ko - Build module including final link' 1427 @echo ' modules_prepare - Set up for building external modules' 1428 @echo ' tags/TAGS - Generate tags file for editors' 1429 @echo ' cscope - Generate cscope index' 1430 @echo ' gtags - Generate GNU GLOBAL index' 1431 @echo ' kernelrelease - Output the release version string (use with make -s)' 1432 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1433 @echo ' image_name - Output the image name (use with make -s)' 1434 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1435 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1436 echo '' 1437 @echo 'Static analysers:' 1438 @echo ' checkstack - Generate a list of stack hogs' 1439 @echo ' namespacecheck - Name space analysis on compiled kernel' 1440 @echo ' versioncheck - Sanity check on version.h usage' 1441 @echo ' includecheck - Check for duplicate included header files' 1442 @echo ' export_report - List the usages of all exported symbols' 1443 @echo ' headers_check - Sanity check on exported headers' 1444 @echo ' headerdep - Detect inclusion cycles in headers' 1445 @echo ' coccicheck - Check with Coccinelle' 1446 @echo '' 1447 @echo 'Kernel selftest:' 1448 @echo ' kselftest - Build and run kernel selftest (run as root)' 1449 @echo ' Build, install, and boot kernel before' 1450 @echo ' running kselftest on it' 1451 @echo ' kselftest-clean - Remove all generated kselftest files' 1452 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1453 @echo ' .config.' 1454 @echo '' 1455 @echo 'Userspace tools targets:' 1456 @echo ' use "make tools/help"' 1457 @echo ' or "cd tools; make help"' 1458 @echo '' 1459 @echo 'Kernel packaging:' 1460 @$(MAKE) $(build)=$(package-dir) help 1461 @echo '' 1462 @echo 'Documentation targets:' 1463 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1464 @echo '' 1465 @echo 'Architecture specific targets ($(SRCARCH)):' 1466 @$(if $(archhelp),$(archhelp),\ 1467 echo ' No architecture specific help defined for $(SRCARCH)') 1468 @echo '' 1469 @$(if $(boards), \ 1470 $(foreach b, $(boards), \ 1471 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1472 echo '') 1473 @$(if $(board-dirs), \ 1474 $(foreach b, $(board-dirs), \ 1475 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1476 printf " %-16s - Show all of the above\\n" help-boards; \ 1477 echo '') 1478 1479 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1480 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1481 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1482 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1483 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1484 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1485 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1486 @echo ' 1: warnings which may be relevant and do not occur too often' 1487 @echo ' 2: warnings which occur quite often but may still be relevant' 1488 @echo ' 3: more obscure warnings, can most likely be ignored' 1489 @echo ' Multiple levels can be combined with W=12 or W=123' 1490 @echo '' 1491 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1492 @echo 'For further info see the ./README file' 1493 1494 1495help-board-dirs := $(addprefix help-,$(board-dirs)) 1496 1497help-boards: $(help-board-dirs) 1498 1499boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1500 1501$(help-board-dirs): help-%: 1502 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1503 @$(if $(boards-per-dir), \ 1504 $(foreach b, $(boards-per-dir), \ 1505 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1506 echo '') 1507 1508 1509# Documentation targets 1510# --------------------------------------------------------------------------- 1511DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1512 linkcheckdocs dochelp refcheckdocs 1513PHONY += $(DOC_TARGETS) 1514$(DOC_TARGETS): scripts_basic FORCE 1515 $(Q)$(MAKE) $(build)=Documentation $@ 1516 1517else # KBUILD_EXTMOD 1518 1519### 1520# External module support. 1521# When building external modules the kernel used as basis is considered 1522# read-only, and no consistency checks are made and the make 1523# system is not used on the basis kernel. If updates are required 1524# in the basis kernel ordinary make commands (without M=...) must 1525# be used. 1526# 1527# The following are the only valid targets when building external 1528# modules. 1529# make M=dir clean Delete all automatically generated files 1530# make M=dir modules Make all modules in specified dir 1531# make M=dir Same as 'make M=dir modules' 1532# make M=dir modules_install 1533# Install the modules built in the module directory 1534# Assumes install directory is already created 1535 1536# We are always building modules 1537KBUILD_MODULES := 1 1538 1539PHONY += $(objtree)/Module.symvers 1540$(objtree)/Module.symvers: 1541 @test -e $(objtree)/Module.symvers || ( \ 1542 echo; \ 1543 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1544 echo " is missing; modules will have no dependencies and modversions."; \ 1545 echo ) 1546 1547module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1548PHONY += $(module-dirs) modules 1549$(module-dirs): prepare $(objtree)/Module.symvers 1550 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1551 1552modules: $(module-dirs) 1553 @$(kecho) ' Building modules, stage 2.'; 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1555 1556PHONY += modules_install 1557modules_install: _emodinst_ _emodinst_post 1558 1559install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1560PHONY += _emodinst_ 1561_emodinst_: 1562 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1564 1565PHONY += _emodinst_post 1566_emodinst_post: _emodinst_ 1567 $(call cmd,depmod) 1568 1569clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1570 1571PHONY += $(clean-dirs) clean 1572$(clean-dirs): 1573 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1574 1575clean: rm-dirs := $(MODVERDIR) 1576clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1577 1578PHONY += help 1579help: 1580 @echo ' Building external modules.' 1581 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1582 @echo '' 1583 @echo ' modules - default target, build the module(s)' 1584 @echo ' modules_install - install the module' 1585 @echo ' clean - remove generated files in module directory only' 1586 @echo '' 1587 1588# Dummies... 1589PHONY += prepare scripts 1590prepare: 1591 $(cmd_crmodverdir) 1592scripts: ; 1593endif # KBUILD_EXTMOD 1594 1595clean: $(clean-dirs) 1596 $(call cmd,rmdirs) 1597 $(call cmd,rmfiles) 1598 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1599 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1600 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1601 -o -name '*.dwo' -o -name '*.lst' \ 1602 -o -name '*.su' \ 1603 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1604 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1605 -o -name '*.asn1.[ch]' \ 1606 -o -name '*.symtypes' -o -name 'modules.order' \ 1607 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1608 -o -name '*.c.[012]*.*' \ 1609 -o -name '*.ll' \ 1610 -o -name '*.gcno' \) -type f -print | xargs rm -f 1611 1612# Generate tags for editors 1613# --------------------------------------------------------------------------- 1614quiet_cmd_tags = GEN $@ 1615 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1616 1617tags TAGS cscope gtags: FORCE 1618 $(call cmd,tags) 1619 1620# Scripts to check various things for consistency 1621# --------------------------------------------------------------------------- 1622 1623PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1624 1625includecheck: 1626 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1627 -name '*.[hcS]' -type f -print | sort \ 1628 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1629 1630versioncheck: 1631 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1632 -name '*.[hcS]' -type f -print | sort \ 1633 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1634 1635coccicheck: 1636 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1637 1638namespacecheck: 1639 $(PERL) $(srctree)/scripts/namespace.pl 1640 1641export_report: 1642 $(PERL) $(srctree)/scripts/export_report.pl 1643 1644endif #ifeq ($(config-targets),1) 1645endif #ifeq ($(mixed-targets),1) 1646 1647PHONY += checkstack kernelrelease kernelversion image_name 1648 1649# UML needs a little special treatment here. It wants to use the host 1650# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1651# else wants $(ARCH), including people doing cross-builds, which means 1652# that $(SUBARCH) doesn't work here. 1653ifeq ($(ARCH), um) 1654CHECKSTACK_ARCH := $(SUBARCH) 1655else 1656CHECKSTACK_ARCH := $(ARCH) 1657endif 1658checkstack: 1659 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1660 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1661 1662kernelrelease: 1663 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1664 1665kernelversion: 1666 @echo $(KERNELVERSION) 1667 1668image_name: 1669 @echo $(KBUILD_IMAGE) 1670 1671# Clear a bunch of variables before executing the submake 1672tools/: FORCE 1673 $(Q)mkdir -p $(objtree)/tools 1674 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1675 1676tools/%: FORCE 1677 $(Q)mkdir -p $(objtree)/tools 1678 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1679 1680# Single targets 1681# --------------------------------------------------------------------------- 1682# Single targets are compatible with: 1683# - build with mixed source and output 1684# - build with separate output dir 'make O=...' 1685# - external modules 1686# 1687# target-dir => where to store outputfile 1688# build-dir => directory in kernel source tree to use 1689 1690ifeq ($(KBUILD_EXTMOD),) 1691 build-dir = $(patsubst %/,%,$(dir $@)) 1692 target-dir = $(dir $@) 1693else 1694 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1695 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1696 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1697endif 1698 1699%.s: %.c prepare scripts FORCE 1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1701%.i: %.c prepare scripts FORCE 1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1703%.o: %.c prepare scripts FORCE 1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1705%.lst: %.c prepare scripts FORCE 1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1707%.s: %.S prepare scripts FORCE 1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1709%.o: %.S prepare scripts FORCE 1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1711%.symtypes: %.c prepare scripts FORCE 1712 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1713%.ll: %.c prepare scripts FORCE 1714 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1715 1716# Modules 1717/: prepare scripts FORCE 1718 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1719 $(build)=$(build-dir) 1720# Make sure the latest headers are built for Documentation 1721Documentation/ samples/: headers_install 1722%/: prepare scripts FORCE 1723 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1724 $(build)=$(build-dir) 1725%.ko: prepare scripts FORCE 1726 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1727 $(build)=$(build-dir) $(@:.ko=.o) 1728 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1729 1730# FIXME Should go into a make.lib or something 1731# =========================================================================== 1732 1733quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1734 cmd_rmdirs = rm -rf $(rm-dirs) 1735 1736quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1737 cmd_rmfiles = rm -f $(rm-files) 1738 1739# Run depmod only if we have System.map and depmod is executable 1740quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1741 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1742 $(KERNELRELEASE) 1743 1744# Create temporary dir for module support files 1745# clean it up only when building all modules 1746cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1747 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1748 1749# read all saved command lines 1750 1751cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1752 1753ifneq ($(cmd_files),) 1754 $(cmd_files): ; # Do not try to update included dependency files 1755 include $(cmd_files) 1756endif 1757 1758endif # skip-makefile 1759 1760PHONY += FORCE 1761FORCE: 1762 1763# Declare the contents of the PHONY variable as phony. We keep that 1764# information in a variable so we can use it in if_changed and friends. 1765.PHONY: $(PHONY) 1766