1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = -rc2 6NAME = Merciless Moray 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 301 302# SUBARCH tells the usermode build what the underlying arch is. That is set 303# first, and if a usermode build is happening, the "ARCH=um" on the command 304# line overrides the setting of ARCH below. If a native build is happening, 305# then ARCH is assigned, getting whatever value it gets normally, and 306# SUBARCH is subsequently ignored. 307 308SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 309 -e s/sun4u/sparc64/ \ 310 -e s/arm.*/arm/ -e s/sa110/arm/ \ 311 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 312 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 313 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 314 -e s/riscv.*/riscv/) 315 316# Cross compiling and selecting different set of gcc/bin-utils 317# --------------------------------------------------------------------------- 318# 319# When performing cross compilation for other architectures ARCH shall be set 320# to the target architecture. (See arch/* for the possibilities). 321# ARCH can be set during invocation of make: 322# make ARCH=ia64 323# Another way is to have ARCH set in the environment. 324# The default ARCH is the host where make is executed. 325 326# CROSS_COMPILE specify the prefix used for all executables used 327# during compilation. Only gcc and related bin-utils executables 328# are prefixed with $(CROSS_COMPILE). 329# CROSS_COMPILE can be set on the command line 330# make CROSS_COMPILE=ia64-linux- 331# Alternatively CROSS_COMPILE can be set in the environment. 332# Default value for CROSS_COMPILE is not to prefix executables 333# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 334ARCH ?= $(SUBARCH) 335 336# Architecture as present in compile.h 337UTS_MACHINE := $(ARCH) 338SRCARCH := $(ARCH) 339 340# Additional ARCH settings for x86 341ifeq ($(ARCH),i386) 342 SRCARCH := x86 343endif 344ifeq ($(ARCH),x86_64) 345 SRCARCH := x86 346endif 347 348# Additional ARCH settings for sparc 349ifeq ($(ARCH),sparc32) 350 SRCARCH := sparc 351endif 352ifeq ($(ARCH),sparc64) 353 SRCARCH := sparc 354endif 355 356# Additional ARCH settings for sh 357ifeq ($(ARCH),sh64) 358 SRCARCH := sh 359endif 360 361KCONFIG_CONFIG ?= .config 362export KCONFIG_CONFIG 363 364# SHELL used by kbuild 365CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 366 else if [ -x /bin/bash ]; then echo /bin/bash; \ 367 else echo sh; fi ; fi) 368 369HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 370HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 371HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 372 373HOSTCC = gcc 374HOSTCXX = g++ 375KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 376 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 377 $(HOSTCFLAGS) 378KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 379KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 380KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 381 382# Make variables (CC, etc...) 383AS = $(CROSS_COMPILE)as 384LD = $(CROSS_COMPILE)ld 385CC = $(CROSS_COMPILE)gcc 386CPP = $(CC) -E 387AR = $(CROSS_COMPILE)ar 388NM = $(CROSS_COMPILE)nm 389STRIP = $(CROSS_COMPILE)strip 390OBJCOPY = $(CROSS_COMPILE)objcopy 391OBJDUMP = $(CROSS_COMPILE)objdump 392LEX = flex 393YACC = bison 394AWK = awk 395GENKSYMS = scripts/genksyms/genksyms 396INSTALLKERNEL := installkernel 397DEPMOD = /sbin/depmod 398PERL = perl 399PYTHON = python 400PYTHON2 = python2 401PYTHON3 = python3 402CHECK = sparse 403 404CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 405 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 406NOSTDINC_FLAGS = 407CFLAGS_MODULE = 408AFLAGS_MODULE = 409LDFLAGS_MODULE = 410CFLAGS_KERNEL = 411AFLAGS_KERNEL = 412LDFLAGS_vmlinux = 413 414# Use USERINCLUDE when you must reference the UAPI directories only. 415USERINCLUDE := \ 416 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 417 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 418 -I$(srctree)/include/uapi \ 419 -I$(objtree)/include/generated/uapi \ 420 -include $(srctree)/include/linux/kconfig.h 421 422# Use LINUXINCLUDE when you must reference the include/ directory. 423# Needed to be compatible with the O= option 424LINUXINCLUDE := \ 425 -I$(srctree)/arch/$(SRCARCH)/include \ 426 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 427 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 428 -I$(objtree)/include \ 429 $(USERINCLUDE) 430 431KBUILD_AFLAGS := -D__ASSEMBLY__ 432KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 433 -fno-strict-aliasing -fno-common -fshort-wchar \ 434 -Werror-implicit-function-declaration \ 435 -Wno-format-security \ 436 -std=gnu89 437KBUILD_CPPFLAGS := -D__KERNEL__ 438KBUILD_AFLAGS_KERNEL := 439KBUILD_CFLAGS_KERNEL := 440KBUILD_AFLAGS_MODULE := -DMODULE 441KBUILD_CFLAGS_MODULE := -DMODULE 442KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 443KBUILD_LDFLAGS := 444GCC_PLUGINS_CFLAGS := 445 446export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 447export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 448export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 449export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 450 451export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 452export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 453export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 454export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 455export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 456export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 457export KBUILD_ARFLAGS 458 459# When compiling out-of-tree modules, put MODVERDIR in the module 460# tree rather than in the kernel tree. The kernel tree might 461# even be read-only. 462export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 463 464# Files to ignore in find ... statements 465 466export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 467 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 468 -prune -o 469export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 470 --exclude CVS --exclude .pc --exclude .hg --exclude .git 471 472# =========================================================================== 473# Rules shared between *config targets and build targets 474 475# Basic helpers built in scripts/basic/ 476PHONY += scripts_basic 477scripts_basic: 478 $(Q)$(MAKE) $(build)=scripts/basic 479 $(Q)rm -f .tmp_quiet_recordmcount 480 481# To avoid any implicit rule to kick in, define an empty command. 482scripts/basic/%: scripts_basic ; 483 484PHONY += outputmakefile 485# outputmakefile generates a Makefile in the output directory, if using a 486# separate output directory. This allows convenient use of make in the 487# output directory. 488outputmakefile: 489ifneq ($(KBUILD_SRC),) 490 $(Q)ln -fsn $(srctree) source 491 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 492 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 493endif 494 495ifeq ($(cc-name),clang) 496ifneq ($(CROSS_COMPILE),) 497CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 498GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 499endif 500ifneq ($(GCC_TOOLCHAIN),) 501CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 502endif 503KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 504KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 505KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 506KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 507endif 508 509RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 510RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 511RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 512RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 513RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 514RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 515export RETPOLINE_CFLAGS 516export RETPOLINE_VDSO_CFLAGS 517 518KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 519KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 520 521# check for 'asm goto' 522ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 523 CC_HAVE_ASM_GOTO := 1 524 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 525 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 526endif 527 528# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 529# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 530# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 531# and from include/config/auto.conf.cmd to detect the compiler upgrade. 532CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 533 534ifeq ($(config-targets),1) 535# =========================================================================== 536# *config targets only - make sure prerequisites are updated, and descend 537# in scripts/kconfig to make the *config target 538 539# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 540# KBUILD_DEFCONFIG may point out an alternative default configuration 541# used for 'make defconfig' 542include arch/$(SRCARCH)/Makefile 543export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 544 545config: scripts_basic outputmakefile FORCE 546 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 547 548%config: scripts_basic outputmakefile FORCE 549 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 550 551else 552# =========================================================================== 553# Build targets only - this includes vmlinux, arch specific targets, clean 554# targets and others. In general all targets except *config targets. 555 556# If building an external module we do not care about the all: rule 557# but instead _all depend on modules 558PHONY += all 559ifeq ($(KBUILD_EXTMOD),) 560_all: all 561else 562_all: modules 563endif 564 565# Decide whether to build built-in, modular, or both. 566# Normally, just do built-in. 567 568KBUILD_MODULES := 569KBUILD_BUILTIN := 1 570 571# If we have only "make modules", don't compile built-in objects. 572# When we're building modules with modversions, we need to consider 573# the built-in objects during the descend as well, in order to 574# make sure the checksums are up to date before we record them. 575 576ifeq ($(MAKECMDGOALS),modules) 577 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 578endif 579 580# If we have "make <whatever> modules", compile modules 581# in addition to whatever we do anyway. 582# Just "make" or "make all" shall build modules as well 583 584ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 585 KBUILD_MODULES := 1 586endif 587 588ifeq ($(MAKECMDGOALS),) 589 KBUILD_MODULES := 1 590endif 591 592export KBUILD_MODULES KBUILD_BUILTIN 593 594ifeq ($(KBUILD_EXTMOD),) 595# Objects we will link into vmlinux / subdirs we need to visit 596init-y := init/ 597drivers-y := drivers/ sound/ firmware/ 598net-y := net/ 599libs-y := lib/ 600core-y := usr/ 601virt-y := virt/ 602endif # KBUILD_EXTMOD 603 604ifeq ($(dot-config),1) 605include include/config/auto.conf 606endif 607 608# The all: target is the default when no target is given on the 609# command line. 610# This allow a user to issue only 'make' to build a kernel including modules 611# Defaults to vmlinux, but the arch makefile usually adds further targets 612all: vmlinux 613 614CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 615 $(call cc-option,-fno-tree-loop-im) \ 616 $(call cc-disable-warning,maybe-uninitialized,) 617export CFLAGS_GCOV 618 619# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 620# values of the respective KBUILD_* variables 621ARCH_CPPFLAGS := 622ARCH_AFLAGS := 623ARCH_CFLAGS := 624include arch/$(SRCARCH)/Makefile 625 626ifeq ($(dot-config),1) 627ifeq ($(may-sync-config),1) 628# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 629# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 630# because some architectures define CROSS_COMPILE there. 631-include include/config/auto.conf.cmd 632 633# To avoid any implicit rule to kick in, define an empty command 634$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 635 636# The actual configuration files used during the build are stored in 637# include/generated/ and include/config/. Update them if .config is newer than 638# include/config/auto.conf (which mirrors .config). 639include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 640 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 641else 642# External modules and some install targets need include/generated/autoconf.h 643# and include/config/auto.conf but do not care if they are up-to-date. 644# Use auto.conf to trigger the test 645PHONY += include/config/auto.conf 646 647include/config/auto.conf: 648 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 649 echo >&2; \ 650 echo >&2 " ERROR: Kernel configuration is invalid."; \ 651 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 652 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 653 echo >&2 ; \ 654 /bin/false) 655 656endif # may-sync-config 657endif # $(dot-config) 658 659KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 660KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 661KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 662KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 663KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 664 665ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 666KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 667KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 668else 669ifdef CONFIG_PROFILE_ALL_BRANCHES 670KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 671else 672KBUILD_CFLAGS += -O2 673endif 674endif 675 676KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 677 $(call cc-disable-warning,maybe-uninitialized,)) 678 679# Tell gcc to never replace conditional load with a non-conditional one 680KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 681 682include scripts/Makefile.kcov 683include scripts/Makefile.gcc-plugins 684 685ifdef CONFIG_READABLE_ASM 686# Disable optimizations that make assembler listings hard to read. 687# reorder blocks reorders the control in the function 688# ipa clone creates specialized cloned functions 689# partial inlining inlines only parts of functions 690KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 691 $(call cc-option,-fno-ipa-cp-clone,) \ 692 $(call cc-option,-fno-partial-inlining) 693endif 694 695ifneq ($(CONFIG_FRAME_WARN),0) 696KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 697endif 698 699stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 700stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 701stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 702 703KBUILD_CFLAGS += $(stackp-flags-y) 704 705ifeq ($(cc-name),clang) 706KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 707KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 708KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 709KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 710# Quiet clang warning: comparison of unsigned expression < 0 is always false 711KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 712# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 713# source of a reference will be _MergedGlobals and not on of the whitelisted names. 714# See modpost pattern 2 715KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 716KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 717else 718 719# These warnings generated too much noise in a regular build. 720# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 721KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 722endif 723 724KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 725ifdef CONFIG_FRAME_POINTER 726KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 727else 728# Some targets (ARM with Thumb2, for example), can't be built with frame 729# pointers. For those, we don't have FUNCTION_TRACER automatically 730# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 731# incompatible with -fomit-frame-pointer with current GCC, so we don't use 732# -fomit-frame-pointer with FUNCTION_TRACER. 733ifndef CONFIG_FUNCTION_TRACER 734KBUILD_CFLAGS += -fomit-frame-pointer 735endif 736endif 737 738KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 739 740ifdef CONFIG_DEBUG_INFO 741ifdef CONFIG_DEBUG_INFO_SPLIT 742KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 743else 744KBUILD_CFLAGS += -g 745endif 746KBUILD_AFLAGS += -Wa,-gdwarf-2 747endif 748ifdef CONFIG_DEBUG_INFO_DWARF4 749KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 750endif 751 752ifdef CONFIG_DEBUG_INFO_REDUCED 753KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 754 $(call cc-option,-fno-var-tracking) 755endif 756 757ifdef CONFIG_FUNCTION_TRACER 758ifndef CC_FLAGS_FTRACE 759CC_FLAGS_FTRACE := -pg 760endif 761ifdef CONFIG_FTRACE_MCOUNT_RECORD 762 # gcc 5 supports generating the mcount tables directly 763 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 764 CC_FLAGS_FTRACE += -mrecord-mcount 765 export CC_USING_RECORD_MCOUNT := 1 766 endif 767 ifdef CONFIG_HAVE_NOP_MCOUNT 768 ifeq ($(call cc-option-yn, -mnop-mcount),y) 769 CC_FLAGS_FTRACE += -mnop-mcount 770 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 771 endif 772 endif 773endif 774ifdef CONFIG_HAVE_FENTRY 775 ifeq ($(call cc-option-yn, -mfentry),y) 776 CC_FLAGS_FTRACE += -mfentry 777 CC_FLAGS_USING += -DCC_USING_FENTRY 778 endif 779endif 780export CC_FLAGS_FTRACE 781KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 782KBUILD_AFLAGS += $(CC_FLAGS_USING) 783ifdef CONFIG_DYNAMIC_FTRACE 784 ifdef CONFIG_HAVE_C_RECORDMCOUNT 785 BUILD_C_RECORDMCOUNT := y 786 export BUILD_C_RECORDMCOUNT 787 endif 788endif 789endif 790 791# We trigger additional mismatches with less inlining 792ifdef CONFIG_DEBUG_SECTION_MISMATCH 793KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 794endif 795 796ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 797KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 798LDFLAGS_vmlinux += --gc-sections 799endif 800 801# arch Makefile may override CC so keep this after arch Makefile is included 802NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 803 804# warn about C99 declaration after statement 805KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 806 807# disable pointer signed / unsigned warnings in gcc 4.0 808KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 809 810# disable stringop warnings in gcc 8+ 811KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 812 813# disable invalid "can't wrap" optimizations for signed / pointers 814KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 815 816# clang sets -fmerge-all-constants by default as optimization, but this 817# is non-conforming behavior for C and in fact breaks the kernel, so we 818# need to disable it here generally. 819KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 820 821# for gcc -fno-merge-all-constants disables everything, but it is fine 822# to have actual conforming behavior enabled. 823KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 824 825# Make sure -fstack-check isn't enabled (like gentoo apparently did) 826KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 827 828# conserve stack if available 829KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 830 831# disallow errors like 'EXPORT_GPL(foo);' with missing header 832KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 833 834# require functions to have arguments in prototypes, not empty 'int foo()' 835KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 836 837# Prohibit date/time macros, which would make the build non-deterministic 838KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 839 840# enforce correct pointer usage 841KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 842 843# Require designated initializers for all marked structures 844KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 845 846# change __FILE__ to the relative path from the srctree 847KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 848 849# use the deterministic mode of AR if available 850KBUILD_ARFLAGS := $(call ar-option,D) 851 852include scripts/Makefile.kasan 853include scripts/Makefile.extrawarn 854include scripts/Makefile.ubsan 855 856# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 857# last assignments 858KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 859KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 860KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 861 862# Use --build-id when available. 863LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 864KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 865LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 866 867ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 868LDFLAGS_vmlinux += $(call ld-option, -X,) 869endif 870 871# insure the checker run with the right endianness 872CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 873 874# the checker needs the correct machine size 875CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 876 877# Default kernel image to build when no specific target is given. 878# KBUILD_IMAGE may be overruled on the command line or 879# set in the environment 880# Also any assignments in arch/$(ARCH)/Makefile take precedence over 881# this default value 882export KBUILD_IMAGE ?= vmlinux 883 884# 885# INSTALL_PATH specifies where to place the updated kernel and system map 886# images. Default is /boot, but you can set it to other values 887export INSTALL_PATH ?= /boot 888 889# 890# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 891# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 892# an argument if needed. Otherwise it defaults to the kernel install path 893# 894export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 895 896# 897# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 898# relocations required by build roots. This is not defined in the 899# makefile but the argument can be passed to make if needed. 900# 901 902MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 903export MODLIB 904 905# 906# INSTALL_MOD_STRIP, if defined, will cause modules to be 907# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 908# the default option --strip-debug will be used. Otherwise, 909# INSTALL_MOD_STRIP value will be used as the options to the strip command. 910 911ifdef INSTALL_MOD_STRIP 912ifeq ($(INSTALL_MOD_STRIP),1) 913mod_strip_cmd = $(STRIP) --strip-debug 914else 915mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 916endif # INSTALL_MOD_STRIP=1 917else 918mod_strip_cmd = true 919endif # INSTALL_MOD_STRIP 920export mod_strip_cmd 921 922# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 923# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 924# or CONFIG_MODULE_COMPRESS_XZ. 925 926mod_compress_cmd = true 927ifdef CONFIG_MODULE_COMPRESS 928 ifdef CONFIG_MODULE_COMPRESS_GZIP 929 mod_compress_cmd = gzip -n -f 930 endif # CONFIG_MODULE_COMPRESS_GZIP 931 ifdef CONFIG_MODULE_COMPRESS_XZ 932 mod_compress_cmd = xz -f 933 endif # CONFIG_MODULE_COMPRESS_XZ 934endif # CONFIG_MODULE_COMPRESS 935export mod_compress_cmd 936 937# Select initial ramdisk compression format, default is gzip(1). 938# This shall be used by the dracut(8) tool while creating an initramfs image. 939# 940INITRD_COMPRESS-y := gzip 941INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 942INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 943INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 944INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 945INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 946# do not export INITRD_COMPRESS, since we didn't actually 947# choose a sane default compression above. 948# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 949 950ifdef CONFIG_MODULE_SIG_ALL 951$(eval $(call config_filename,MODULE_SIG_KEY)) 952 953mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 954else 955mod_sign_cmd = true 956endif 957export mod_sign_cmd 958 959ifdef CONFIG_STACK_VALIDATION 960 has_libelf := $(call try-run,\ 961 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 962 ifeq ($(has_libelf),1) 963 objtool_target := tools/objtool FORCE 964 else 965 ifdef CONFIG_UNWINDER_ORC 966 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 967 else 968 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 969 endif 970 SKIP_STACK_VALIDATION := 1 971 export SKIP_STACK_VALIDATION 972 endif 973endif 974 975 976ifeq ($(KBUILD_EXTMOD),) 977core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 978 979vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 980 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 981 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 982 983vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 984 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 985 986init-y := $(patsubst %/, %/built-in.a, $(init-y)) 987core-y := $(patsubst %/, %/built-in.a, $(core-y)) 988drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 989net-y := $(patsubst %/, %/built-in.a, $(net-y)) 990libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 991libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 992virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 993 994# Externally visible symbols (used by link-vmlinux.sh) 995export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 996export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 997export KBUILD_VMLINUX_LIBS := $(libs-y1) 998export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 999export LDFLAGS_vmlinux 1000# used by scripts/package/Makefile 1001export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1002 1003vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1004 1005# Recurse until adjust_autoksyms.sh is satisfied 1006PHONY += autoksyms_recursive 1007autoksyms_recursive: $(vmlinux-deps) 1008ifdef CONFIG_TRIM_UNUSED_KSYMS 1009 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1010 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1011endif 1012 1013# For the kernel to actually contain only the needed exported symbols, 1014# we have to build modules as well to determine what those symbols are. 1015# (this can be evaluated only once include/config/auto.conf has been included) 1016ifdef CONFIG_TRIM_UNUSED_KSYMS 1017 KBUILD_MODULES := 1 1018endif 1019 1020autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1021 1022$(autoksyms_h): 1023 $(Q)mkdir -p $(dir $@) 1024 $(Q)touch $@ 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) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1031 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1032 1033vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1034ifdef CONFIG_HEADERS_CHECK 1035 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1036endif 1037ifdef CONFIG_GDB_SCRIPTS 1038 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1039endif 1040 +$(call if_changed,link-vmlinux) 1041 1042# Build samples along the rest of the kernel. This needs headers_install. 1043ifdef CONFIG_SAMPLES 1044vmlinux-dirs += samples 1045samples: headers_install 1046endif 1047 1048# The actual objects are generated when descending, 1049# make sure no implicit rule kicks in 1050$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1051 1052# Handle descending into subdirectories listed in $(vmlinux-dirs) 1053# Preset locale variables to speed up the build process. Limit locale 1054# tweaks to this spot to avoid wrong language settings when running 1055# make menuconfig etc. 1056# Error messages still appears in the original language 1057 1058PHONY += $(vmlinux-dirs) 1059$(vmlinux-dirs): prepare scripts 1060 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1061 1062define filechk_kernel.release 1063 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1064endef 1065 1066# Store (new) KERNELRELEASE string in include/config/kernel.release 1067include/config/kernel.release: $(srctree)/Makefile FORCE 1068 $(call filechk,kernel.release) 1069 1070# Additional helpers built in scripts/ 1071# Carefully list dependencies so we do not try to build scripts twice 1072# in parallel 1073PHONY += scripts 1074scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) 1075 $(Q)$(MAKE) $(build)=$(@) 1076 1077# Things we need to do before we recursively start building the kernel 1078# or the modules are listed in "prepare". 1079# A multi level approach is used. prepareN is processed before prepareN-1. 1080# archprepare is used in arch Makefiles and when processed asm symlink, 1081# version.h and scripts_basic is processed / created. 1082 1083# Listed in dependency order 1084PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1085 1086# prepare3 is used to check if we are building in a separate output directory, 1087# and if so do: 1088# 1) Check that make has not been executed in the kernel src $(srctree) 1089prepare3: include/config/kernel.release 1090ifneq ($(KBUILD_SRC),) 1091 @$(kecho) ' Using $(srctree) as source for kernel' 1092 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1093 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1094 echo >&2 " in the '$(srctree)' directory.";\ 1095 /bin/false; \ 1096 fi; 1097endif 1098 1099# prepare2 creates a makefile if using a separate output directory. 1100# From this point forward, .config has been reprocessed, so any rules 1101# that need to depend on updated CONFIG_* values can be checked here. 1102prepare2: prepare3 outputmakefile asm-generic 1103 1104prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1105 $(cmd_crmodverdir) 1106 1107archprepare: archheaders archscripts prepare1 scripts_basic 1108 1109prepare0: archprepare gcc-plugins 1110 $(Q)$(MAKE) $(build)=. 1111 1112# All the preparing.. 1113prepare: prepare0 prepare-objtool 1114 1115# Support for using generic headers in asm-generic 1116PHONY += asm-generic uapi-asm-generic 1117asm-generic: uapi-asm-generic 1118 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1119 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1120uapi-asm-generic: 1121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1122 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1123 1124PHONY += prepare-objtool 1125prepare-objtool: $(objtool_target) 1126 1127# Generate some files 1128# --------------------------------------------------------------------------- 1129 1130# KERNELRELEASE can change from a few different places, meaning version.h 1131# needs to be updated, so this check is forced on all builds 1132 1133uts_len := 64 1134define filechk_utsrelease.h 1135 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1136 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1137 exit 1; \ 1138 fi; \ 1139 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1140endef 1141 1142define filechk_version.h 1143 (echo \#define LINUX_VERSION_CODE $(shell \ 1144 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1145 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1146endef 1147 1148$(version_h): FORCE 1149 $(call filechk,version.h) 1150 $(Q)rm -f $(old_version_h) 1151 1152include/generated/utsrelease.h: include/config/kernel.release FORCE 1153 $(call filechk,utsrelease.h) 1154 1155PHONY += headerdep 1156headerdep: 1157 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1158 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1159 1160# --------------------------------------------------------------------------- 1161# Kernel headers 1162 1163#Default location for installed headers 1164export INSTALL_HDR_PATH = $(objtree)/usr 1165 1166# If we do an all arch process set dst to include/arch-$(SRCARCH) 1167hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1168 1169PHONY += archheaders 1170archheaders: 1171 1172PHONY += archscripts 1173archscripts: 1174 1175PHONY += __headers 1176__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1177 $(Q)$(MAKE) $(build)=scripts build_unifdef 1178 1179PHONY += headers_install_all 1180headers_install_all: 1181 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1182 1183PHONY += headers_install 1184headers_install: __headers 1185 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1186 $(error Headers not exportable for the $(SRCARCH) architecture)) 1187 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1188 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1189 1190PHONY += headers_check_all 1191headers_check_all: headers_install_all 1192 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1193 1194PHONY += headers_check 1195headers_check: headers_install 1196 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1197 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1198 1199# --------------------------------------------------------------------------- 1200# Kernel selftest 1201 1202PHONY += kselftest 1203kselftest: 1204 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1205 1206PHONY += kselftest-clean 1207kselftest-clean: 1208 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1209 1210PHONY += kselftest-merge 1211kselftest-merge: 1212 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1213 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1214 -m $(objtree)/.config \ 1215 $(srctree)/tools/testing/selftests/*/config 1216 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1217 1218# --------------------------------------------------------------------------- 1219# Modules 1220 1221ifdef CONFIG_MODULES 1222 1223# By default, build modules as well 1224 1225all: modules 1226 1227# Build modules 1228# 1229# A module can be listed more than once in obj-m resulting in 1230# duplicate lines in modules.order files. Those are removed 1231# using awk while concatenating to the final file. 1232 1233PHONY += modules 1234modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1235 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1236 @$(kecho) ' Building modules, stage 2.'; 1237 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1238 1239modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1240 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1241 1242%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1243 $(Q)$(MAKE) $(modbuiltin)=$* 1244 1245 1246# Target to prepare building external modules 1247PHONY += modules_prepare 1248modules_prepare: prepare scripts 1249 1250# Target to install modules 1251PHONY += modules_install 1252modules_install: _modinst_ _modinst_post 1253 1254PHONY += _modinst_ 1255_modinst_: 1256 @rm -rf $(MODLIB)/kernel 1257 @rm -f $(MODLIB)/source 1258 @mkdir -p $(MODLIB)/kernel 1259 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1260 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1261 rm -f $(MODLIB)/build ; \ 1262 ln -s $(CURDIR) $(MODLIB)/build ; \ 1263 fi 1264 @cp -f $(objtree)/modules.order $(MODLIB)/ 1265 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1266 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1267 1268# This depmod is only for convenience to give the initial 1269# boot a modules.dep even before / is mounted read-write. However the 1270# boot script depmod is the master version. 1271PHONY += _modinst_post 1272_modinst_post: _modinst_ 1273 $(call cmd,depmod) 1274 1275ifeq ($(CONFIG_MODULE_SIG), y) 1276PHONY += modules_sign 1277modules_sign: 1278 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1279endif 1280 1281else # CONFIG_MODULES 1282 1283# Modules not configured 1284# --------------------------------------------------------------------------- 1285 1286PHONY += modules modules_install 1287modules modules_install: 1288 @echo >&2 1289 @echo >&2 "The present kernel configuration has modules disabled." 1290 @echo >&2 "Type 'make config' and enable loadable module support." 1291 @echo >&2 "Then build a kernel with module support enabled." 1292 @echo >&2 1293 @exit 1 1294 1295endif # CONFIG_MODULES 1296 1297### 1298# Cleaning is done on three levels. 1299# make clean Delete most generated files 1300# Leave enough to build external modules 1301# make mrproper Delete the current configuration, and all generated files 1302# make distclean Remove editor backup files, patch leftover files and the like 1303 1304# Directories & files removed with 'make clean' 1305CLEAN_DIRS += $(MODVERDIR) include/ksym 1306 1307# Directories & files removed with 'make mrproper' 1308MRPROPER_DIRS += include/config usr/include include/generated \ 1309 arch/*/include/generated .tmp_objdiff 1310MRPROPER_FILES += .config .config.old .version \ 1311 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1312 signing_key.pem signing_key.priv signing_key.x509 \ 1313 x509.genkey extra_certificates signing_key.x509.keyid \ 1314 signing_key.x509.signer vmlinux-gdb.py 1315 1316# clean - Delete most, but leave enough to build external modules 1317# 1318clean: rm-dirs := $(CLEAN_DIRS) 1319clean: rm-files := $(CLEAN_FILES) 1320clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1321 1322PHONY += $(clean-dirs) clean archclean vmlinuxclean 1323$(clean-dirs): 1324 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1325 1326vmlinuxclean: 1327 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1328 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1329 1330clean: archclean vmlinuxclean 1331 1332# mrproper - Delete all generated files, including .config 1333# 1334mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1335mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1336mrproper-dirs := $(addprefix _mrproper_,scripts) 1337 1338PHONY += $(mrproper-dirs) mrproper archmrproper 1339$(mrproper-dirs): 1340 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1341 1342mrproper: clean archmrproper $(mrproper-dirs) 1343 $(call cmd,rmdirs) 1344 $(call cmd,rmfiles) 1345 1346# distclean 1347# 1348PHONY += distclean 1349 1350distclean: mrproper 1351 @find $(srctree) $(RCS_FIND_IGNORE) \ 1352 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1353 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1354 -o -name 'core' \) \ 1355 -type f -print | xargs rm -f 1356 1357 1358# Packaging of the kernel to various formats 1359# --------------------------------------------------------------------------- 1360package-dir := scripts/package 1361 1362%src-pkg: FORCE 1363 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1364%pkg: include/config/kernel.release FORCE 1365 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1366 1367 1368# Brief documentation of the typical targets used 1369# --------------------------------------------------------------------------- 1370 1371boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1372boards := $(sort $(notdir $(boards))) 1373board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1374board-dirs := $(sort $(notdir $(board-dirs:/=))) 1375 1376PHONY += help 1377help: 1378 @echo 'Cleaning targets:' 1379 @echo ' clean - Remove most generated files but keep the config and' 1380 @echo ' enough build support to build external modules' 1381 @echo ' mrproper - Remove all generated files + config + various backup files' 1382 @echo ' distclean - mrproper + remove editor backup and patch files' 1383 @echo '' 1384 @echo 'Configuration targets:' 1385 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1386 @echo '' 1387 @echo 'Other generic targets:' 1388 @echo ' all - Build all targets marked with [*]' 1389 @echo '* vmlinux - Build the bare kernel' 1390 @echo '* modules - Build all modules' 1391 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1392 @echo ' dir/ - Build all files in dir and below' 1393 @echo ' dir/file.[ois] - Build specified target only' 1394 @echo ' dir/file.ll - Build the LLVM assembly file' 1395 @echo ' (requires compiler support for LLVM assembly generation)' 1396 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1397 @echo ' (requires a recent binutils and recent build (System.map))' 1398 @echo ' dir/file.ko - Build module including final link' 1399 @echo ' modules_prepare - Set up for building external modules' 1400 @echo ' tags/TAGS - Generate tags file for editors' 1401 @echo ' cscope - Generate cscope index' 1402 @echo ' gtags - Generate GNU GLOBAL index' 1403 @echo ' kernelrelease - Output the release version string (use with make -s)' 1404 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1405 @echo ' image_name - Output the image name (use with make -s)' 1406 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1407 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1408 echo '' 1409 @echo 'Static analysers:' 1410 @echo ' checkstack - Generate a list of stack hogs' 1411 @echo ' namespacecheck - Name space analysis on compiled kernel' 1412 @echo ' versioncheck - Sanity check on version.h usage' 1413 @echo ' includecheck - Check for duplicate included header files' 1414 @echo ' export_report - List the usages of all exported symbols' 1415 @echo ' headers_check - Sanity check on exported headers' 1416 @echo ' headerdep - Detect inclusion cycles in headers' 1417 @echo ' coccicheck - Check with Coccinelle' 1418 @echo '' 1419 @echo 'Kernel selftest:' 1420 @echo ' kselftest - Build and run kernel selftest (run as root)' 1421 @echo ' Build, install, and boot kernel before' 1422 @echo ' running kselftest on it' 1423 @echo ' kselftest-clean - Remove all generated kselftest files' 1424 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1425 @echo ' .config.' 1426 @echo '' 1427 @echo 'Userspace tools targets:' 1428 @echo ' use "make tools/help"' 1429 @echo ' or "cd tools; make help"' 1430 @echo '' 1431 @echo 'Kernel packaging:' 1432 @$(MAKE) $(build)=$(package-dir) help 1433 @echo '' 1434 @echo 'Documentation targets:' 1435 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1436 @echo '' 1437 @echo 'Architecture specific targets ($(SRCARCH)):' 1438 @$(if $(archhelp),$(archhelp),\ 1439 echo ' No architecture specific help defined for $(SRCARCH)') 1440 @echo '' 1441 @$(if $(boards), \ 1442 $(foreach b, $(boards), \ 1443 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1444 echo '') 1445 @$(if $(board-dirs), \ 1446 $(foreach b, $(board-dirs), \ 1447 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1448 printf " %-16s - Show all of the above\\n" help-boards; \ 1449 echo '') 1450 1451 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1452 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1453 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1454 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1455 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1456 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1457 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1458 @echo ' 1: warnings which may be relevant and do not occur too often' 1459 @echo ' 2: warnings which occur quite often but may still be relevant' 1460 @echo ' 3: more obscure warnings, can most likely be ignored' 1461 @echo ' Multiple levels can be combined with W=12 or W=123' 1462 @echo '' 1463 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1464 @echo 'For further info see the ./README file' 1465 1466 1467help-board-dirs := $(addprefix help-,$(board-dirs)) 1468 1469help-boards: $(help-board-dirs) 1470 1471boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1472 1473$(help-board-dirs): help-%: 1474 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1475 @$(if $(boards-per-dir), \ 1476 $(foreach b, $(boards-per-dir), \ 1477 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1478 echo '') 1479 1480 1481# Documentation targets 1482# --------------------------------------------------------------------------- 1483DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1484 linkcheckdocs dochelp refcheckdocs 1485PHONY += $(DOC_TARGETS) 1486$(DOC_TARGETS): scripts_basic FORCE 1487 $(Q)$(MAKE) $(build)=Documentation $@ 1488 1489else # KBUILD_EXTMOD 1490 1491### 1492# External module support. 1493# When building external modules the kernel used as basis is considered 1494# read-only, and no consistency checks are made and the make 1495# system is not used on the basis kernel. If updates are required 1496# in the basis kernel ordinary make commands (without M=...) must 1497# be used. 1498# 1499# The following are the only valid targets when building external 1500# modules. 1501# make M=dir clean Delete all automatically generated files 1502# make M=dir modules Make all modules in specified dir 1503# make M=dir Same as 'make M=dir modules' 1504# make M=dir modules_install 1505# Install the modules built in the module directory 1506# Assumes install directory is already created 1507 1508# We are always building modules 1509KBUILD_MODULES := 1 1510PHONY += crmodverdir 1511crmodverdir: 1512 $(cmd_crmodverdir) 1513 1514PHONY += $(objtree)/Module.symvers 1515$(objtree)/Module.symvers: 1516 @test -e $(objtree)/Module.symvers || ( \ 1517 echo; \ 1518 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1519 echo " is missing; modules will have no dependencies and modversions."; \ 1520 echo ) 1521 1522module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1523PHONY += $(module-dirs) modules 1524$(module-dirs): crmodverdir $(objtree)/Module.symvers 1525 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1526 1527modules: $(module-dirs) 1528 @$(kecho) ' Building modules, stage 2.'; 1529 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1530 1531PHONY += modules_install 1532modules_install: _emodinst_ _emodinst_post 1533 1534install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1535PHONY += _emodinst_ 1536_emodinst_: 1537 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1538 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1539 1540PHONY += _emodinst_post 1541_emodinst_post: _emodinst_ 1542 $(call cmd,depmod) 1543 1544clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1545 1546PHONY += $(clean-dirs) clean 1547$(clean-dirs): 1548 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1549 1550clean: rm-dirs := $(MODVERDIR) 1551clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1552 1553PHONY += help 1554help: 1555 @echo ' Building external modules.' 1556 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1557 @echo '' 1558 @echo ' modules - default target, build the module(s)' 1559 @echo ' modules_install - install the module' 1560 @echo ' clean - remove generated files in module directory only' 1561 @echo '' 1562 1563# Dummies... 1564PHONY += prepare scripts 1565prepare: ; 1566scripts: ; 1567endif # KBUILD_EXTMOD 1568 1569clean: $(clean-dirs) 1570 $(call cmd,rmdirs) 1571 $(call cmd,rmfiles) 1572 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1573 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1574 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1575 -o -name '*.dwo' -o -name '*.lst' \ 1576 -o -name '*.su' \ 1577 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1578 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1579 -o -name '*.asn1.[ch]' \ 1580 -o -name '*.symtypes' -o -name 'modules.order' \ 1581 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1582 -o -name '*.c.[012]*.*' \ 1583 -o -name '*.ll' \ 1584 -o -name '*.gcno' \) -type f -print | xargs rm -f 1585 1586# Generate tags for editors 1587# --------------------------------------------------------------------------- 1588quiet_cmd_tags = GEN $@ 1589 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1590 1591tags TAGS cscope gtags: FORCE 1592 $(call cmd,tags) 1593 1594# Scripts to check various things for consistency 1595# --------------------------------------------------------------------------- 1596 1597PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1598 1599includecheck: 1600 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1601 -name '*.[hcS]' -type f -print | sort \ 1602 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1603 1604versioncheck: 1605 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1606 -name '*.[hcS]' -type f -print | sort \ 1607 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1608 1609coccicheck: 1610 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1611 1612namespacecheck: 1613 $(PERL) $(srctree)/scripts/namespace.pl 1614 1615export_report: 1616 $(PERL) $(srctree)/scripts/export_report.pl 1617 1618endif #ifeq ($(config-targets),1) 1619endif #ifeq ($(mixed-targets),1) 1620 1621PHONY += checkstack kernelrelease kernelversion image_name 1622 1623# UML needs a little special treatment here. It wants to use the host 1624# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1625# else wants $(ARCH), including people doing cross-builds, which means 1626# that $(SUBARCH) doesn't work here. 1627ifeq ($(ARCH), um) 1628CHECKSTACK_ARCH := $(SUBARCH) 1629else 1630CHECKSTACK_ARCH := $(ARCH) 1631endif 1632checkstack: 1633 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1634 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1635 1636kernelrelease: 1637 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1638 1639kernelversion: 1640 @echo $(KERNELVERSION) 1641 1642image_name: 1643 @echo $(KBUILD_IMAGE) 1644 1645# Clear a bunch of variables before executing the submake 1646tools/: FORCE 1647 $(Q)mkdir -p $(objtree)/tools 1648 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1649 1650tools/%: FORCE 1651 $(Q)mkdir -p $(objtree)/tools 1652 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1653 1654# Single targets 1655# --------------------------------------------------------------------------- 1656# Single targets are compatible with: 1657# - build with mixed source and output 1658# - build with separate output dir 'make O=...' 1659# - external modules 1660# 1661# target-dir => where to store outputfile 1662# build-dir => directory in kernel source tree to use 1663 1664ifeq ($(KBUILD_EXTMOD),) 1665 build-dir = $(patsubst %/,%,$(dir $@)) 1666 target-dir = $(dir $@) 1667else 1668 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1669 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1670 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1671endif 1672 1673%.s: %.c prepare scripts FORCE 1674 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1675%.i: %.c prepare scripts FORCE 1676 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1677%.o: %.c prepare scripts FORCE 1678 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1679%.lst: %.c prepare scripts FORCE 1680 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1681%.s: %.S prepare scripts FORCE 1682 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1683%.o: %.S prepare scripts FORCE 1684 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1685%.symtypes: %.c prepare scripts FORCE 1686 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1687%.ll: %.c prepare scripts FORCE 1688 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1689 1690# Modules 1691/: prepare scripts FORCE 1692 $(cmd_crmodverdir) 1693 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1694 $(build)=$(build-dir) 1695# Make sure the latest headers are built for Documentation 1696Documentation/ samples/: headers_install 1697%/: prepare scripts FORCE 1698 $(cmd_crmodverdir) 1699 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1700 $(build)=$(build-dir) 1701%.ko: prepare scripts FORCE 1702 $(cmd_crmodverdir) 1703 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1704 $(build)=$(build-dir) $(@:.ko=.o) 1705 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1706 1707# FIXME Should go into a make.lib or something 1708# =========================================================================== 1709 1710quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1711 cmd_rmdirs = rm -rf $(rm-dirs) 1712 1713quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1714 cmd_rmfiles = rm -f $(rm-files) 1715 1716# Run depmod only if we have System.map and depmod is executable 1717quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1718 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1719 $(KERNELRELEASE) 1720 1721# Create temporary dir for module support files 1722# clean it up only when building all modules 1723cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1724 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1725 1726# read all saved command lines 1727 1728cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1729 1730ifneq ($(cmd_files),) 1731 $(cmd_files): ; # Do not try to update included dependency files 1732 include $(cmd_files) 1733endif 1734 1735endif # skip-makefile 1736 1737PHONY += FORCE 1738FORCE: 1739 1740# Declare the contents of the PHONY variable as phony. We keep that 1741# information in a variable so we can use it in if_changed and friends. 1742.PHONY: $(PHONY) 1743