1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 16 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 6NAME = Fearless Coyote 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.o 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 223no-dot-config-targets := clean mrproper distclean \ 224 cscope gtags TAGS tags help% %docs check% coccicheck \ 225 $(version_h) headers_% archheaders archscripts \ 226 kernelversion %src-pkg 227 228config-targets := 0 229mixed-targets := 0 230dot-config := 1 231 232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 233 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 dot-config := 0 235 endif 236endif 237 238ifeq ($(KBUILD_EXTMOD),) 239 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 240 config-targets := 1 241 ifneq ($(words $(MAKECMDGOALS)),1) 242 mixed-targets := 1 243 endif 244 endif 245endif 246# install and modules_install need also be processed one by one 247ifneq ($(filter install,$(MAKECMDGOALS)),) 248 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 249 mixed-targets := 1 250 endif 251endif 252 253ifeq ($(mixed-targets),1) 254# =========================================================================== 255# We're called with mixed targets (*config and build targets). 256# Handle them one by one. 257 258PHONY += $(MAKECMDGOALS) __build_one_by_one 259 260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 261 @: 262 263__build_one_by_one: 264 $(Q)set -e; \ 265 for i in $(MAKECMDGOALS); do \ 266 $(MAKE) -f $(srctree)/Makefile $$i; \ 267 done 268 269else 270 271# We need some generic definitions (do not try to remake the file). 272scripts/Kbuild.include: ; 273include scripts/Kbuild.include 274 275# Read KERNELRELEASE from include/config/kernel.release (if it exists) 276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 279 280# SUBARCH tells the usermode build what the underlying arch is. That is set 281# first, and if a usermode build is happening, the "ARCH=um" on the command 282# line overrides the setting of ARCH below. If a native build is happening, 283# then ARCH is assigned, getting whatever value it gets normally, and 284# SUBARCH is subsequently ignored. 285 286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 287 -e s/sun4u/sparc64/ \ 288 -e s/arm.*/arm/ -e s/sa110/arm/ \ 289 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 290 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 291 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 292 -e s/riscv.*/riscv/) 293 294# Cross compiling and selecting different set of gcc/bin-utils 295# --------------------------------------------------------------------------- 296# 297# When performing cross compilation for other architectures ARCH shall be set 298# to the target architecture. (See arch/* for the possibilities). 299# ARCH can be set during invocation of make: 300# make ARCH=ia64 301# Another way is to have ARCH set in the environment. 302# The default ARCH is the host where make is executed. 303 304# CROSS_COMPILE specify the prefix used for all executables used 305# during compilation. Only gcc and related bin-utils executables 306# are prefixed with $(CROSS_COMPILE). 307# CROSS_COMPILE can be set on the command line 308# make CROSS_COMPILE=ia64-linux- 309# Alternatively CROSS_COMPILE can be set in the environment. 310# A third alternative is to store a setting in .config so that plain 311# "make" in the configured kernel build directory always uses that. 312# Default value for CROSS_COMPILE is not to prefix executables 313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 314ARCH ?= $(SUBARCH) 315CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 316 317# Architecture as present in compile.h 318UTS_MACHINE := $(ARCH) 319SRCARCH := $(ARCH) 320 321# Additional ARCH settings for x86 322ifeq ($(ARCH),i386) 323 SRCARCH := x86 324endif 325ifeq ($(ARCH),x86_64) 326 SRCARCH := x86 327endif 328 329# Additional ARCH settings for sparc 330ifeq ($(ARCH),sparc32) 331 SRCARCH := sparc 332endif 333ifeq ($(ARCH),sparc64) 334 SRCARCH := sparc 335endif 336 337# Additional ARCH settings for sh 338ifeq ($(ARCH),sh64) 339 SRCARCH := sh 340endif 341 342# Additional ARCH settings for tile 343ifeq ($(ARCH),tilepro) 344 SRCARCH := tile 345endif 346ifeq ($(ARCH),tilegx) 347 SRCARCH := tile 348endif 349 350KCONFIG_CONFIG ?= .config 351export KCONFIG_CONFIG 352 353# SHELL used by kbuild 354CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 355 else if [ -x /bin/bash ]; then echo /bin/bash; \ 356 else echo sh; fi ; fi) 357 358HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 359HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 360HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 361 362HOSTCC = gcc 363HOSTCXX = g++ 364HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 365 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 366HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 367HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 368HOST_LOADLIBES := $(HOST_LFS_LIBS) 369 370# Make variables (CC, etc...) 371AS = $(CROSS_COMPILE)as 372LD = $(CROSS_COMPILE)ld 373CC = $(CROSS_COMPILE)gcc 374CPP = $(CC) -E 375AR = $(CROSS_COMPILE)ar 376NM = $(CROSS_COMPILE)nm 377STRIP = $(CROSS_COMPILE)strip 378OBJCOPY = $(CROSS_COMPILE)objcopy 379OBJDUMP = $(CROSS_COMPILE)objdump 380LEX = flex 381YACC = bison 382AWK = awk 383GENKSYMS = scripts/genksyms/genksyms 384INSTALLKERNEL := installkernel 385DEPMOD = /sbin/depmod 386PERL = perl 387PYTHON = python 388PYTHON2 = python2 389PYTHON3 = python3 390CHECK = sparse 391 392CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 393 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 394NOSTDINC_FLAGS = 395CFLAGS_MODULE = 396AFLAGS_MODULE = 397LDFLAGS_MODULE = 398CFLAGS_KERNEL = 399AFLAGS_KERNEL = 400LDFLAGS_vmlinux = 401 402# Use USERINCLUDE when you must reference the UAPI directories only. 403USERINCLUDE := \ 404 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 405 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 406 -I$(srctree)/include/uapi \ 407 -I$(objtree)/include/generated/uapi \ 408 -include $(srctree)/include/linux/kconfig.h 409 410# Use LINUXINCLUDE when you must reference the include/ directory. 411# Needed to be compatible with the O= option 412LINUXINCLUDE := \ 413 -I$(srctree)/arch/$(SRCARCH)/include \ 414 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 415 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 416 -I$(objtree)/include \ 417 $(USERINCLUDE) 418 419KBUILD_AFLAGS := -D__ASSEMBLY__ 420KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 421 -fno-strict-aliasing -fno-common -fshort-wchar \ 422 -Werror-implicit-function-declaration \ 423 -Wno-format-security \ 424 -std=gnu89 425KBUILD_CPPFLAGS := -D__KERNEL__ 426KBUILD_AFLAGS_KERNEL := 427KBUILD_CFLAGS_KERNEL := 428KBUILD_AFLAGS_MODULE := -DMODULE 429KBUILD_CFLAGS_MODULE := -DMODULE 430KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 431GCC_PLUGINS_CFLAGS := 432 433export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 434export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 435export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 436export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 437 438export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 439export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 440export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 441export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 442export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 443export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 444export KBUILD_ARFLAGS 445 446# When compiling out-of-tree modules, put MODVERDIR in the module 447# tree rather than in the kernel tree. The kernel tree might 448# even be read-only. 449export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 450 451# Files to ignore in find ... statements 452 453export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 454 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 455 -prune -o 456export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 457 --exclude CVS --exclude .pc --exclude .hg --exclude .git 458 459# =========================================================================== 460# Rules shared between *config targets and build targets 461 462# Basic helpers built in scripts/basic/ 463PHONY += scripts_basic 464scripts_basic: 465 $(Q)$(MAKE) $(build)=scripts/basic 466 $(Q)rm -f .tmp_quiet_recordmcount 467 468# To avoid any implicit rule to kick in, define an empty command. 469scripts/basic/%: scripts_basic ; 470 471PHONY += outputmakefile 472# outputmakefile generates a Makefile in the output directory, if using a 473# separate output directory. This allows convenient use of make in the 474# output directory. 475outputmakefile: 476ifneq ($(KBUILD_SRC),) 477 $(Q)ln -fsn $(srctree) source 478 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 479 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 480endif 481 482ifeq ($(cc-name),clang) 483ifneq ($(CROSS_COMPILE),) 484CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 485GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 486endif 487ifneq ($(GCC_TOOLCHAIN),) 488CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 489endif 490KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 491KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 492endif 493 494RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 495RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 496RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 497export RETPOLINE_CFLAGS 498 499ifeq ($(config-targets),1) 500# =========================================================================== 501# *config targets only - make sure prerequisites are updated, and descend 502# in scripts/kconfig to make the *config target 503 504# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 505# KBUILD_DEFCONFIG may point out an alternative default configuration 506# used for 'make defconfig' 507include arch/$(SRCARCH)/Makefile 508export KBUILD_DEFCONFIG KBUILD_KCONFIG 509 510config: scripts_basic outputmakefile FORCE 511 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 512 513%config: scripts_basic outputmakefile FORCE 514 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 515 516else 517# =========================================================================== 518# Build targets only - this includes vmlinux, arch specific targets, clean 519# targets and others. In general all targets except *config targets. 520 521# If building an external module we do not care about the all: rule 522# but instead _all depend on modules 523PHONY += all 524ifeq ($(KBUILD_EXTMOD),) 525_all: all 526else 527_all: modules 528endif 529 530# Decide whether to build built-in, modular, or both. 531# Normally, just do built-in. 532 533KBUILD_MODULES := 534KBUILD_BUILTIN := 1 535 536# If we have only "make modules", don't compile built-in objects. 537# When we're building modules with modversions, we need to consider 538# the built-in objects during the descend as well, in order to 539# make sure the checksums are up to date before we record them. 540 541ifeq ($(MAKECMDGOALS),modules) 542 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 543endif 544 545# If we have "make <whatever> modules", compile modules 546# in addition to whatever we do anyway. 547# Just "make" or "make all" shall build modules as well 548 549ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 550 KBUILD_MODULES := 1 551endif 552 553ifeq ($(MAKECMDGOALS),) 554 KBUILD_MODULES := 1 555endif 556 557export KBUILD_MODULES KBUILD_BUILTIN 558 559ifeq ($(KBUILD_EXTMOD),) 560# Additional helpers built in scripts/ 561# Carefully list dependencies so we do not try to build scripts twice 562# in parallel 563PHONY += scripts 564scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 565 asm-generic gcc-plugins 566 $(Q)$(MAKE) $(build)=$(@) 567 568# Objects we will link into vmlinux / subdirs we need to visit 569init-y := init/ 570drivers-y := drivers/ sound/ firmware/ 571net-y := net/ 572libs-y := lib/ 573core-y := usr/ 574virt-y := virt/ 575endif # KBUILD_EXTMOD 576 577ifeq ($(dot-config),1) 578# Read in config 579-include include/config/auto.conf 580 581ifeq ($(KBUILD_EXTMOD),) 582# Read in dependencies to all Kconfig* files, make sure to run 583# oldconfig if changes are detected. 584-include include/config/auto.conf.cmd 585 586# To avoid any implicit rule to kick in, define an empty command 587$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 588 589# The actual configuration files used during the build are stored in 590# include/generated/ and include/config/. Update them if .config is newer than 591# include/config/auto.conf (which mirrors .config). 592include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 593 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 594else 595# external modules needs include/generated/autoconf.h and include/config/auto.conf 596# but do not care if they are up-to-date. Use auto.conf to trigger the test 597PHONY += include/config/auto.conf 598 599include/config/auto.conf: 600 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 601 echo >&2; \ 602 echo >&2 " ERROR: Kernel configuration is invalid."; \ 603 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 604 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 605 echo >&2 ; \ 606 /bin/false) 607 608endif # KBUILD_EXTMOD 609 610else 611# Dummy target needed, because used as prerequisite 612include/config/auto.conf: ; 613endif # $(dot-config) 614 615# For the kernel to actually contain only the needed exported symbols, 616# we have to build modules as well to determine what those symbols are. 617# (this can be evaluated only once include/config/auto.conf has been included) 618ifdef CONFIG_TRIM_UNUSED_KSYMS 619 KBUILD_MODULES := 1 620endif 621 622# The all: target is the default when no target is given on the 623# command line. 624# This allow a user to issue only 'make' to build a kernel including modules 625# Defaults to vmlinux, but the arch makefile usually adds further targets 626all: vmlinux 627 628KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 629KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 630CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 631export CFLAGS_GCOV CFLAGS_KCOV 632 633# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 634# values of the respective KBUILD_* variables 635ARCH_CPPFLAGS := 636ARCH_AFLAGS := 637ARCH_CFLAGS := 638include arch/$(SRCARCH)/Makefile 639 640KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 641KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 642KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 643KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 644KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 645 646ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 647KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 648KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 649else 650ifdef CONFIG_PROFILE_ALL_BRANCHES 651KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 652else 653KBUILD_CFLAGS += -O2 654endif 655endif 656 657KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 658 $(call cc-disable-warning,maybe-uninitialized,)) 659 660# Tell gcc to never replace conditional load with a non-conditional one 661KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 662 663# check for 'asm goto' 664ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 665 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 666 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 667endif 668 669include scripts/Makefile.kcov 670include scripts/Makefile.gcc-plugins 671 672ifdef CONFIG_READABLE_ASM 673# Disable optimizations that make assembler listings hard to read. 674# reorder blocks reorders the control in the function 675# ipa clone creates specialized cloned functions 676# partial inlining inlines only parts of functions 677KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 678 $(call cc-option,-fno-ipa-cp-clone,) \ 679 $(call cc-option,-fno-partial-inlining) 680endif 681 682ifneq ($(CONFIG_FRAME_WARN),0) 683KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 684endif 685 686# This selects the stack protector compiler flag. Testing it is delayed 687# until after .config has been reprocessed, in the prepare-compiler-check 688# target. 689ifdef CONFIG_CC_STACKPROTECTOR_AUTO 690 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 691 stackp-name := AUTO 692else 693ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 694 stackp-flag := -fstack-protector 695 stackp-name := REGULAR 696else 697ifdef CONFIG_CC_STACKPROTECTOR_STRONG 698 stackp-flag := -fstack-protector-strong 699 stackp-name := STRONG 700else 701 # If either there is no stack protector for this architecture or 702 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 703 # is empty, skipping all remaining stack protector tests. 704 # 705 # Force off for distro compilers that enable stack protector by default. 706 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 707endif 708endif 709endif 710# Find arch-specific stack protector compiler sanity-checking script. 711ifdef stackp-name 712ifneq ($(stackp-flag),) 713 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 714 stackp-check := $(wildcard $(stackp-path)) 715 # If the wildcard test matches a test script, run it to check functionality. 716 ifdef stackp-check 717 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 718 stackp-broken := y 719 endif 720 endif 721 ifndef stackp-broken 722 # If the stack protector is functional, enable code that depends on it. 723 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 724 # Either we've already detected the flag (for AUTO) or we'll fail the 725 # build in the prepare-compiler-check rule (for specific flag). 726 KBUILD_CFLAGS += $(stackp-flag) 727 else 728 # We have to make sure stack protector is unconditionally disabled if 729 # the compiler is broken (in case we're going to continue the build in 730 # AUTO mode). 731 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 732 endif 733endif 734endif 735 736ifeq ($(cc-name),clang) 737KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 738KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 739KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 740KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 741# Quiet clang warning: comparison of unsigned expression < 0 is always false 742KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 743# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 744# source of a reference will be _MergedGlobals and not on of the whitelisted names. 745# See modpost pattern 2 746KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 747KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 748KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 749KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 750else 751 752# These warnings generated too much noise in a regular build. 753# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 754KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 755endif 756 757KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 758ifdef CONFIG_FRAME_POINTER 759KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 760else 761# Some targets (ARM with Thumb2, for example), can't be built with frame 762# pointers. For those, we don't have FUNCTION_TRACER automatically 763# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 764# incompatible with -fomit-frame-pointer with current GCC, so we don't use 765# -fomit-frame-pointer with FUNCTION_TRACER. 766ifndef CONFIG_FUNCTION_TRACER 767KBUILD_CFLAGS += -fomit-frame-pointer 768endif 769endif 770 771KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 772 773ifdef CONFIG_DEBUG_INFO 774ifdef CONFIG_DEBUG_INFO_SPLIT 775KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 776else 777KBUILD_CFLAGS += -g 778endif 779KBUILD_AFLAGS += -Wa,-gdwarf-2 780endif 781ifdef CONFIG_DEBUG_INFO_DWARF4 782KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 783endif 784 785ifdef CONFIG_DEBUG_INFO_REDUCED 786KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 787 $(call cc-option,-fno-var-tracking) 788endif 789 790ifdef CONFIG_FUNCTION_TRACER 791ifndef CC_FLAGS_FTRACE 792CC_FLAGS_FTRACE := -pg 793endif 794export CC_FLAGS_FTRACE 795ifdef CONFIG_HAVE_FENTRY 796CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 797endif 798KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 799KBUILD_AFLAGS += $(CC_USING_FENTRY) 800ifdef CONFIG_DYNAMIC_FTRACE 801 ifdef CONFIG_HAVE_C_RECORDMCOUNT 802 BUILD_C_RECORDMCOUNT := y 803 export BUILD_C_RECORDMCOUNT 804 endif 805endif 806endif 807 808# We trigger additional mismatches with less inlining 809ifdef CONFIG_DEBUG_SECTION_MISMATCH 810KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 811endif 812 813ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 814KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 815KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 816endif 817 818# arch Makefile may override CC so keep this after arch Makefile is included 819NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 820CHECKFLAGS += $(NOSTDINC_FLAGS) 821 822# warn about C99 declaration after statement 823KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 824 825# disable pointer signed / unsigned warnings in gcc 4.0 826KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 827 828# disable invalid "can't wrap" optimizations for signed / pointers 829KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 830 831# Make sure -fstack-check isn't enabled (like gentoo apparently did) 832KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 833 834# conserve stack if available 835KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 836 837# disallow errors like 'EXPORT_GPL(foo);' with missing header 838KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 839 840# require functions to have arguments in prototypes, not empty 'int foo()' 841KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 842 843# Prohibit date/time macros, which would make the build non-deterministic 844KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 845 846# enforce correct pointer usage 847KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 848 849# Require designated initializers for all marked structures 850KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 851 852# use the deterministic mode of AR if available 853KBUILD_ARFLAGS := $(call ar-option,D) 854 855include scripts/Makefile.kasan 856include scripts/Makefile.extrawarn 857include scripts/Makefile.ubsan 858 859# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 860# last assignments 861KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 862KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 863KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 864 865# Use --build-id when available. 866LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 867KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 868LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 869 870ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 871LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 872endif 873 874ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 875LDFLAGS_vmlinux += $(call ld-option, -X,) 876endif 877 878# Default kernel image to build when no specific target is given. 879# KBUILD_IMAGE may be overruled on the command line or 880# set in the environment 881# Also any assignments in arch/$(ARCH)/Makefile take precedence over 882# this default value 883export KBUILD_IMAGE ?= vmlinux 884 885# 886# INSTALL_PATH specifies where to place the updated kernel and system map 887# images. Default is /boot, but you can set it to other values 888export INSTALL_PATH ?= /boot 889 890# 891# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 892# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 893# an argument if needed. Otherwise it defaults to the kernel install path 894# 895export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 896 897# 898# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 899# relocations required by build roots. This is not defined in the 900# makefile but the argument can be passed to make if needed. 901# 902 903MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 904export MODLIB 905 906# 907# INSTALL_MOD_STRIP, if defined, will cause modules to be 908# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 909# the default option --strip-debug will be used. Otherwise, 910# INSTALL_MOD_STRIP value will be used as the options to the strip command. 911 912ifdef INSTALL_MOD_STRIP 913ifeq ($(INSTALL_MOD_STRIP),1) 914mod_strip_cmd = $(STRIP) --strip-debug 915else 916mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 917endif # INSTALL_MOD_STRIP=1 918else 919mod_strip_cmd = true 920endif # INSTALL_MOD_STRIP 921export mod_strip_cmd 922 923# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 924# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 925# or CONFIG_MODULE_COMPRESS_XZ. 926 927mod_compress_cmd = true 928ifdef CONFIG_MODULE_COMPRESS 929 ifdef CONFIG_MODULE_COMPRESS_GZIP 930 mod_compress_cmd = gzip -n -f 931 endif # CONFIG_MODULE_COMPRESS_GZIP 932 ifdef CONFIG_MODULE_COMPRESS_XZ 933 mod_compress_cmd = xz -f 934 endif # CONFIG_MODULE_COMPRESS_XZ 935endif # CONFIG_MODULE_COMPRESS 936export mod_compress_cmd 937 938# Select initial ramdisk compression format, default is gzip(1). 939# This shall be used by the dracut(8) tool while creating an initramfs image. 940# 941INITRD_COMPRESS-y := gzip 942INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 943INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 944INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 945INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 946INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 947# do not export INITRD_COMPRESS, since we didn't actually 948# choose a sane default compression above. 949# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 950 951ifdef CONFIG_MODULE_SIG_ALL 952$(eval $(call config_filename,MODULE_SIG_KEY)) 953 954mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 955else 956mod_sign_cmd = true 957endif 958export mod_sign_cmd 959 960ifdef CONFIG_STACK_VALIDATION 961 has_libelf := $(call try-run,\ 962 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 963 ifeq ($(has_libelf),1) 964 objtool_target := tools/objtool FORCE 965 else 966 ifdef CONFIG_UNWINDER_ORC 967 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 968 else 969 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 970 endif 971 SKIP_STACK_VALIDATION := 1 972 export SKIP_STACK_VALIDATION 973 endif 974endif 975 976 977ifeq ($(KBUILD_EXTMOD),) 978core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 979 980vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 981 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 982 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 983 984vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 985 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 986 987init-y := $(patsubst %/, %/built-in.o, $(init-y)) 988core-y := $(patsubst %/, %/built-in.o, $(core-y)) 989drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 990net-y := $(patsubst %/, %/built-in.o, $(net-y)) 991libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 992libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 993virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 994 995# Externally visible symbols (used by link-vmlinux.sh) 996export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 997export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 998export KBUILD_VMLINUX_LIBS := $(libs-y1) 999export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1000export LDFLAGS_vmlinux 1001# used by scripts/package/Makefile 1002export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1003 1004vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1005 1006# Include targets which we want to execute sequentially if the rest of the 1007# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 1008# evaluated more than once. 1009PHONY += vmlinux_prereq 1010vmlinux_prereq: $(vmlinux-deps) FORCE 1011ifdef CONFIG_HEADERS_CHECK 1012 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1013endif 1014ifdef CONFIG_GDB_SCRIPTS 1015 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1016endif 1017ifdef CONFIG_TRIM_UNUSED_KSYMS 1018 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1019 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1020endif 1021 1022# standalone target for easier testing 1023include/generated/autoksyms.h: FORCE 1024 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1025 1026ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1027 1028# Final link of vmlinux with optional arch pass after final link 1029cmd_link-vmlinux = \ 1030 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1031 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1032 1033vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1034 +$(call if_changed,link-vmlinux) 1035 1036# Build samples along the rest of the kernel 1037ifdef CONFIG_SAMPLES 1038vmlinux-dirs += samples 1039endif 1040 1041# The actual objects are generated when descending, 1042# make sure no implicit rule kicks in 1043$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1044 1045# Handle descending into subdirectories listed in $(vmlinux-dirs) 1046# Preset locale variables to speed up the build process. Limit locale 1047# tweaks to this spot to avoid wrong language settings when running 1048# make menuconfig etc. 1049# Error messages still appears in the original language 1050 1051PHONY += $(vmlinux-dirs) 1052$(vmlinux-dirs): prepare scripts 1053 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1054 1055define filechk_kernel.release 1056 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1057endef 1058 1059# Store (new) KERNELRELEASE string in include/config/kernel.release 1060include/config/kernel.release: include/config/auto.conf FORCE 1061 $(call filechk,kernel.release) 1062 1063 1064# Things we need to do before we recursively start building the kernel 1065# or the modules are listed in "prepare". 1066# A multi level approach is used. prepareN is processed before prepareN-1. 1067# archprepare is used in arch Makefiles and when processed asm symlink, 1068# version.h and scripts_basic is processed / created. 1069 1070# Listed in dependency order 1071PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1072 1073# prepare3 is used to check if we are building in a separate output directory, 1074# and if so do: 1075# 1) Check that make has not been executed in the kernel src $(srctree) 1076prepare3: include/config/kernel.release 1077ifneq ($(KBUILD_SRC),) 1078 @$(kecho) ' Using $(srctree) as source for kernel' 1079 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1080 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1081 echo >&2 " in the '$(srctree)' directory.";\ 1082 /bin/false; \ 1083 fi; 1084endif 1085 1086# prepare2 creates a makefile if using a separate output directory. 1087# From this point forward, .config has been reprocessed, so any rules 1088# that need to depend on updated CONFIG_* values can be checked here. 1089prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1090 1091prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1092 include/config/auto.conf 1093 $(cmd_crmodverdir) 1094 1095archprepare: archheaders archscripts prepare1 scripts_basic 1096 1097prepare0: archprepare gcc-plugins 1098 $(Q)$(MAKE) $(build)=. 1099 1100# All the preparing.. 1101prepare: prepare0 prepare-objtool 1102 1103# Support for using generic headers in asm-generic 1104PHONY += asm-generic uapi-asm-generic 1105asm-generic: uapi-asm-generic 1106 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1107 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1108uapi-asm-generic: 1109 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1110 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1111 1112PHONY += prepare-objtool 1113prepare-objtool: $(objtool_target) 1114 1115# Check for CONFIG flags that require compiler support. Abort the build 1116# after .config has been processed, but before the kernel build starts. 1117# 1118# For security-sensitive CONFIG options, we don't want to fallback and/or 1119# silently change which compiler flags will be used, since that leads to 1120# producing kernels with different security feature characteristics 1121# depending on the compiler used. (For example, "But I selected 1122# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1123PHONY += prepare-compiler-check 1124prepare-compiler-check: FORCE 1125# Make sure compiler supports requested stack protector flag. 1126ifdef stackp-name 1127 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1128 ifeq ($(stackp-flag),) 1129 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1130 Compiler does not support any known stack-protector >&2 1131 else 1132 # Fail if specifically requested stack protector is missing. 1133 ifeq ($(call cc-option, $(stackp-flag)),) 1134 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1135 $(stackp-flag) not supported by compiler >&2 && exit 1 1136 endif 1137 endif 1138endif 1139# Make sure compiler does not have buggy stack-protector support. If a 1140# specific stack-protector was requested, fail the build, otherwise warn. 1141ifdef stackp-broken 1142 ifeq ($(stackp-name),AUTO) 1143 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1144 $(stackp-flag) available but compiler is broken: disabling >&2 1145 else 1146 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1147 $(stackp-flag) available but compiler is broken >&2 && exit 1 1148 endif 1149endif 1150 @: 1151 1152# Generate some files 1153# --------------------------------------------------------------------------- 1154 1155# KERNELRELEASE can change from a few different places, meaning version.h 1156# needs to be updated, so this check is forced on all builds 1157 1158uts_len := 64 1159define filechk_utsrelease.h 1160 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1161 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1162 exit 1; \ 1163 fi; \ 1164 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1165endef 1166 1167define filechk_version.h 1168 (echo \#define LINUX_VERSION_CODE $(shell \ 1169 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1170 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1171endef 1172 1173$(version_h): $(srctree)/Makefile FORCE 1174 $(call filechk,version.h) 1175 $(Q)rm -f $(old_version_h) 1176 1177include/generated/utsrelease.h: include/config/kernel.release FORCE 1178 $(call filechk,utsrelease.h) 1179 1180PHONY += headerdep 1181headerdep: 1182 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1183 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1184 1185# --------------------------------------------------------------------------- 1186# Kernel headers 1187 1188#Default location for installed headers 1189export INSTALL_HDR_PATH = $(objtree)/usr 1190 1191# If we do an all arch process set dst to include/arch-$(SRCARCH) 1192hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1193 1194PHONY += archheaders 1195archheaders: 1196 1197PHONY += archscripts 1198archscripts: 1199 1200PHONY += __headers 1201__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1202 $(Q)$(MAKE) $(build)=scripts build_unifdef 1203 1204PHONY += headers_install_all 1205headers_install_all: 1206 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1207 1208PHONY += headers_install 1209headers_install: __headers 1210 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1211 $(error Headers not exportable for the $(SRCARCH) architecture)) 1212 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1213 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1214 1215PHONY += headers_check_all 1216headers_check_all: headers_install_all 1217 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1218 1219PHONY += headers_check 1220headers_check: headers_install 1221 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1222 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1223 1224# --------------------------------------------------------------------------- 1225# Kernel selftest 1226 1227PHONY += kselftest 1228kselftest: 1229 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1230 1231PHONY += kselftest-clean 1232kselftest-clean: 1233 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1234 1235PHONY += kselftest-merge 1236kselftest-merge: 1237 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1238 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1239 -m $(objtree)/.config \ 1240 $(srctree)/tools/testing/selftests/*/config 1241 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1242 1243# --------------------------------------------------------------------------- 1244# Modules 1245 1246ifdef CONFIG_MODULES 1247 1248# By default, build modules as well 1249 1250all: modules 1251 1252# Build modules 1253# 1254# A module can be listed more than once in obj-m resulting in 1255# duplicate lines in modules.order files. Those are removed 1256# using awk while concatenating to the final file. 1257 1258PHONY += modules 1259modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1260 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1261 @$(kecho) ' Building modules, stage 2.'; 1262 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1263 1264modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1265 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1266 1267%/modules.builtin: include/config/auto.conf 1268 $(Q)$(MAKE) $(modbuiltin)=$* 1269 1270 1271# Target to prepare building external modules 1272PHONY += modules_prepare 1273modules_prepare: prepare scripts 1274 1275# Target to install modules 1276PHONY += modules_install 1277modules_install: _modinst_ _modinst_post 1278 1279PHONY += _modinst_ 1280_modinst_: 1281 @rm -rf $(MODLIB)/kernel 1282 @rm -f $(MODLIB)/source 1283 @mkdir -p $(MODLIB)/kernel 1284 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1285 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1286 rm -f $(MODLIB)/build ; \ 1287 ln -s $(CURDIR) $(MODLIB)/build ; \ 1288 fi 1289 @cp -f $(objtree)/modules.order $(MODLIB)/ 1290 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1291 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1292 1293# This depmod is only for convenience to give the initial 1294# boot a modules.dep even before / is mounted read-write. However the 1295# boot script depmod is the master version. 1296PHONY += _modinst_post 1297_modinst_post: _modinst_ 1298 $(call cmd,depmod) 1299 1300ifeq ($(CONFIG_MODULE_SIG), y) 1301PHONY += modules_sign 1302modules_sign: 1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1304endif 1305 1306else # CONFIG_MODULES 1307 1308# Modules not configured 1309# --------------------------------------------------------------------------- 1310 1311PHONY += modules modules_install 1312modules modules_install: 1313 @echo >&2 1314 @echo >&2 "The present kernel configuration has modules disabled." 1315 @echo >&2 "Type 'make config' and enable loadable module support." 1316 @echo >&2 "Then build a kernel with module support enabled." 1317 @echo >&2 1318 @exit 1 1319 1320endif # CONFIG_MODULES 1321 1322### 1323# Cleaning is done on three levels. 1324# make clean Delete most generated files 1325# Leave enough to build external modules 1326# make mrproper Delete the current configuration, and all generated files 1327# make distclean Remove editor backup files, patch leftover files and the like 1328 1329# Directories & files removed with 'make clean' 1330CLEAN_DIRS += $(MODVERDIR) 1331 1332# Directories & files removed with 'make mrproper' 1333MRPROPER_DIRS += include/config usr/include include/generated \ 1334 arch/*/include/generated .tmp_objdiff 1335MRPROPER_FILES += .config .config.old .version \ 1336 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1337 signing_key.pem signing_key.priv signing_key.x509 \ 1338 x509.genkey extra_certificates signing_key.x509.keyid \ 1339 signing_key.x509.signer vmlinux-gdb.py 1340 1341# clean - Delete most, but leave enough to build external modules 1342# 1343clean: rm-dirs := $(CLEAN_DIRS) 1344clean: rm-files := $(CLEAN_FILES) 1345clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1346 1347PHONY += $(clean-dirs) clean archclean vmlinuxclean 1348$(clean-dirs): 1349 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1350 1351vmlinuxclean: 1352 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1353 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1354 1355clean: archclean vmlinuxclean 1356 1357# mrproper - Delete all generated files, including .config 1358# 1359mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1360mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1361mrproper-dirs := $(addprefix _mrproper_,scripts) 1362 1363PHONY += $(mrproper-dirs) mrproper archmrproper 1364$(mrproper-dirs): 1365 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1366 1367mrproper: clean archmrproper $(mrproper-dirs) 1368 $(call cmd,rmdirs) 1369 $(call cmd,rmfiles) 1370 1371# distclean 1372# 1373PHONY += distclean 1374 1375distclean: mrproper 1376 @find $(srctree) $(RCS_FIND_IGNORE) \ 1377 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1378 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1379 -o -name 'core' \) \ 1380 -type f -print | xargs rm -f 1381 1382 1383# Packaging of the kernel to various formats 1384# --------------------------------------------------------------------------- 1385# rpm target kept for backward compatibility 1386package-dir := scripts/package 1387 1388%src-pkg: FORCE 1389 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1390%pkg: include/config/kernel.release FORCE 1391 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1392rpm: rpm-pkg 1393 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1394 @echo " Please use \"rpm-pkg\" instead." 1395 1396 1397# Brief documentation of the typical targets used 1398# --------------------------------------------------------------------------- 1399 1400boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1401boards := $(sort $(notdir $(boards))) 1402board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1403board-dirs := $(sort $(notdir $(board-dirs:/=))) 1404 1405PHONY += help 1406help: 1407 @echo 'Cleaning targets:' 1408 @echo ' clean - Remove most generated files but keep the config and' 1409 @echo ' enough build support to build external modules' 1410 @echo ' mrproper - Remove all generated files + config + various backup files' 1411 @echo ' distclean - mrproper + remove editor backup and patch files' 1412 @echo '' 1413 @echo 'Configuration targets:' 1414 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1415 @echo '' 1416 @echo 'Other generic targets:' 1417 @echo ' all - Build all targets marked with [*]' 1418 @echo '* vmlinux - Build the bare kernel' 1419 @echo '* modules - Build all modules' 1420 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1421 @echo ' dir/ - Build all files in dir and below' 1422 @echo ' dir/file.[ois] - Build specified target only' 1423 @echo ' dir/file.ll - Build the LLVM assembly file' 1424 @echo ' (requires compiler support for LLVM assembly generation)' 1425 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1426 @echo ' (requires a recent binutils and recent build (System.map))' 1427 @echo ' dir/file.ko - Build module including final link' 1428 @echo ' modules_prepare - Set up for building external modules' 1429 @echo ' tags/TAGS - Generate tags file for editors' 1430 @echo ' cscope - Generate cscope index' 1431 @echo ' gtags - Generate GNU GLOBAL index' 1432 @echo ' kernelrelease - Output the release version string (use with make -s)' 1433 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1434 @echo ' image_name - Output the image name (use with make -s)' 1435 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1436 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1437 echo '' 1438 @echo 'Static analysers:' 1439 @echo ' checkstack - Generate a list of stack hogs' 1440 @echo ' namespacecheck - Name space analysis on compiled kernel' 1441 @echo ' versioncheck - Sanity check on version.h usage' 1442 @echo ' includecheck - Check for duplicate included header files' 1443 @echo ' export_report - List the usages of all exported symbols' 1444 @echo ' headers_check - Sanity check on exported headers' 1445 @echo ' headerdep - Detect inclusion cycles in headers' 1446 @echo ' coccicheck - Check with Coccinelle' 1447 @echo '' 1448 @echo 'Kernel selftest:' 1449 @echo ' kselftest - Build and run kernel selftest (run as root)' 1450 @echo ' Build, install, and boot kernel before' 1451 @echo ' running kselftest on it' 1452 @echo ' kselftest-clean - Remove all generated kselftest files' 1453 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1454 @echo ' .config.' 1455 @echo '' 1456 @echo 'Userspace tools targets:' 1457 @echo ' use "make tools/help"' 1458 @echo ' or "cd tools; make help"' 1459 @echo '' 1460 @echo 'Kernel packaging:' 1461 @$(MAKE) $(build)=$(package-dir) help 1462 @echo '' 1463 @echo 'Documentation targets:' 1464 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1465 @echo '' 1466 @echo 'Architecture specific targets ($(SRCARCH)):' 1467 @$(if $(archhelp),$(archhelp),\ 1468 echo ' No architecture specific help defined for $(SRCARCH)') 1469 @echo '' 1470 @$(if $(boards), \ 1471 $(foreach b, $(boards), \ 1472 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1473 echo '') 1474 @$(if $(board-dirs), \ 1475 $(foreach b, $(board-dirs), \ 1476 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1477 printf " %-16s - Show all of the above\\n" help-boards; \ 1478 echo '') 1479 1480 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1481 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1482 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1483 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1484 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1485 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1486 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1487 @echo ' 1: warnings which may be relevant and do not occur too often' 1488 @echo ' 2: warnings which occur quite often but may still be relevant' 1489 @echo ' 3: more obscure warnings, can most likely be ignored' 1490 @echo ' Multiple levels can be combined with W=12 or W=123' 1491 @echo '' 1492 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1493 @echo 'For further info see the ./README file' 1494 1495 1496help-board-dirs := $(addprefix help-,$(board-dirs)) 1497 1498help-boards: $(help-board-dirs) 1499 1500boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1501 1502$(help-board-dirs): help-%: 1503 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1504 @$(if $(boards-per-dir), \ 1505 $(foreach b, $(boards-per-dir), \ 1506 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1507 echo '') 1508 1509 1510# Documentation targets 1511# --------------------------------------------------------------------------- 1512DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1513 linkcheckdocs dochelp refcheckdocs 1514PHONY += $(DOC_TARGETS) 1515$(DOC_TARGETS): scripts_basic FORCE 1516 $(Q)$(MAKE) $(build)=Documentation $@ 1517 1518else # KBUILD_EXTMOD 1519 1520### 1521# External module support. 1522# When building external modules the kernel used as basis is considered 1523# read-only, and no consistency checks are made and the make 1524# system is not used on the basis kernel. If updates are required 1525# in the basis kernel ordinary make commands (without M=...) must 1526# be used. 1527# 1528# The following are the only valid targets when building external 1529# modules. 1530# make M=dir clean Delete all automatically generated files 1531# make M=dir modules Make all modules in specified dir 1532# make M=dir Same as 'make M=dir modules' 1533# make M=dir modules_install 1534# Install the modules built in the module directory 1535# Assumes install directory is already created 1536 1537# We are always building modules 1538KBUILD_MODULES := 1 1539PHONY += crmodverdir 1540crmodverdir: 1541 $(cmd_crmodverdir) 1542 1543PHONY += $(objtree)/Module.symvers 1544$(objtree)/Module.symvers: 1545 @test -e $(objtree)/Module.symvers || ( \ 1546 echo; \ 1547 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1548 echo " is missing; modules will have no dependencies and modversions."; \ 1549 echo ) 1550 1551module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1552PHONY += $(module-dirs) modules 1553$(module-dirs): crmodverdir $(objtree)/Module.symvers 1554 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1555 1556modules: $(module-dirs) 1557 @$(kecho) ' Building modules, stage 2.'; 1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1559 1560PHONY += modules_install 1561modules_install: _emodinst_ _emodinst_post 1562 1563install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1564PHONY += _emodinst_ 1565_emodinst_: 1566 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1567 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1568 1569PHONY += _emodinst_post 1570_emodinst_post: _emodinst_ 1571 $(call cmd,depmod) 1572 1573clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1574 1575PHONY += $(clean-dirs) clean 1576$(clean-dirs): 1577 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1578 1579clean: rm-dirs := $(MODVERDIR) 1580clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1581 1582PHONY += help 1583help: 1584 @echo ' Building external modules.' 1585 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1586 @echo '' 1587 @echo ' modules - default target, build the module(s)' 1588 @echo ' modules_install - install the module' 1589 @echo ' clean - remove generated files in module directory only' 1590 @echo '' 1591 1592# Dummies... 1593PHONY += prepare scripts 1594prepare: ; 1595scripts: ; 1596endif # KBUILD_EXTMOD 1597 1598clean: $(clean-dirs) 1599 $(call cmd,rmdirs) 1600 $(call cmd,rmfiles) 1601 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1602 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1603 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1604 -o -name '*.dwo' -o -name '*.lst' \ 1605 -o -name '*.su' \ 1606 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1607 -o -name '*.symtypes' -o -name 'modules.order' \ 1608 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1609 -o -name .cache.mk \ 1610 -o -name '*.c.[012]*.*' \ 1611 -o -name '*.ll' \ 1612 -o -name '*.gcno' \) -type f -print | xargs rm -f 1613 1614# Generate tags for editors 1615# --------------------------------------------------------------------------- 1616quiet_cmd_tags = GEN $@ 1617 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1618 1619tags TAGS cscope gtags: FORCE 1620 $(call cmd,tags) 1621 1622# Scripts to check various things for consistency 1623# --------------------------------------------------------------------------- 1624 1625PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1626 1627includecheck: 1628 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1629 -name '*.[hcS]' -type f -print | sort \ 1630 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1631 1632versioncheck: 1633 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1634 -name '*.[hcS]' -type f -print | sort \ 1635 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1636 1637coccicheck: 1638 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1639 1640namespacecheck: 1641 $(PERL) $(srctree)/scripts/namespace.pl 1642 1643export_report: 1644 $(PERL) $(srctree)/scripts/export_report.pl 1645 1646endif #ifeq ($(config-targets),1) 1647endif #ifeq ($(mixed-targets),1) 1648 1649PHONY += checkstack kernelrelease kernelversion image_name 1650 1651# UML needs a little special treatment here. It wants to use the host 1652# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1653# else wants $(ARCH), including people doing cross-builds, which means 1654# that $(SUBARCH) doesn't work here. 1655ifeq ($(ARCH), um) 1656CHECKSTACK_ARCH := $(SUBARCH) 1657else 1658CHECKSTACK_ARCH := $(ARCH) 1659endif 1660checkstack: 1661 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1662 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1663 1664kernelrelease: 1665 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1666 1667kernelversion: 1668 @echo $(KERNELVERSION) 1669 1670image_name: 1671 @echo $(KBUILD_IMAGE) 1672 1673# Clear a bunch of variables before executing the submake 1674tools/: FORCE 1675 $(Q)mkdir -p $(objtree)/tools 1676 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1677 1678tools/%: FORCE 1679 $(Q)mkdir -p $(objtree)/tools 1680 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1681 1682# Single targets 1683# --------------------------------------------------------------------------- 1684# Single targets are compatible with: 1685# - build with mixed source and output 1686# - build with separate output dir 'make O=...' 1687# - external modules 1688# 1689# target-dir => where to store outputfile 1690# build-dir => directory in kernel source tree to use 1691 1692ifeq ($(KBUILD_EXTMOD),) 1693 build-dir = $(patsubst %/,%,$(dir $@)) 1694 target-dir = $(dir $@) 1695else 1696 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1697 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1698 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1699endif 1700 1701%.s: %.c prepare scripts FORCE 1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1703%.i: %.c prepare scripts FORCE 1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1705%.o: %.c prepare scripts FORCE 1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1707%.lst: %.c prepare scripts FORCE 1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1709%.s: %.S prepare scripts FORCE 1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1711%.o: %.S prepare scripts FORCE 1712 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1713%.symtypes: %.c prepare scripts FORCE 1714 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1715%.ll: %.c prepare scripts FORCE 1716 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1717 1718# Modules 1719/: prepare scripts FORCE 1720 $(cmd_crmodverdir) 1721 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1722 $(build)=$(build-dir) 1723# Make sure the latest headers are built for Documentation 1724Documentation/ samples/: headers_install 1725%/: prepare scripts FORCE 1726 $(cmd_crmodverdir) 1727 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1728 $(build)=$(build-dir) 1729%.ko: prepare scripts FORCE 1730 $(cmd_crmodverdir) 1731 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1732 $(build)=$(build-dir) $(@:.ko=.o) 1733 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1734 1735# FIXME Should go into a make.lib or something 1736# =========================================================================== 1737 1738quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1739 cmd_rmdirs = rm -rf $(rm-dirs) 1740 1741quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1742 cmd_rmfiles = rm -f $(rm-files) 1743 1744# Run depmod only if we have System.map and depmod is executable 1745quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1746 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1747 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1748 1749# Create temporary dir for module support files 1750# clean it up only when building all modules 1751cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1752 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1753 1754# read all saved command lines 1755 1756cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1757 1758ifneq ($(cmd_files),) 1759 $(cmd_files): ; # Do not try to update included dependency files 1760 include $(cmd_files) 1761endif 1762 1763endif # skip-makefile 1764 1765PHONY += FORCE 1766FORCE: 1767 1768# Declare the contents of the .PHONY variable as phony. We keep that 1769# information in a variable so we can use it in if_changed and friends. 1770.PHONY: $(PHONY) 1771