1VERSION = 4 2PATCHLEVEL = 1 3SUBLEVEL = 27 4EXTRAVERSION = 5NAME = Series 4800 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# o Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15# o Look for make include files relative to root of kernel src 16MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18# Avoid funny character set dependencies 19unexport LC_ALL 20LC_COLLATE=C 21LC_NUMERIC=C 22export LC_COLLATE LC_NUMERIC 23 24# Avoid interference with shell env settings 25unexport GREP_OPTIONS 26 27# We are using a recursive build, so we need to do a little thinking 28# to get the ordering right. 29# 30# Most importantly: sub-Makefiles should only ever modify files in 31# their own directory. If in some directory we have a dependency on 32# a file in another dir (which doesn't happen often, but it's often 33# unavoidable when linking the built-in.o targets which finally 34# turn into vmlinux), we will call a sub make in that other dir, and 35# after that we are sure that everything which is in that other dir 36# is now up to date. 37# 38# The only cases where we need to modify files which have global 39# effects are thus separated out and done before the recursive 40# descending is started. They are now explicitly listed as the 41# prepare rule. 42 43# Beautify output 44# --------------------------------------------------------------------------- 45# 46# Normally, we echo the whole command before executing it. By making 47# that echo $($(quiet)$(cmd)), we now have the possibility to set 48# $(quiet) to choose other forms of output instead, e.g. 49# 50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52# 53# If $(quiet) is empty, the whole command will be printed. 54# If it is set to "quiet_", only the short version will be printed. 55# If it is set to "silent_", nothing will be printed at all, since 56# the variable $(silent_cmd_cc_o_c) doesn't exist. 57# 58# A simple variant is to prefix commands with $(Q) - that's useful 59# for commands that shall be hidden in non-verbose mode. 60# 61# $(Q)ln $@ :< 62# 63# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64# If KBUILD_VERBOSE equals 1 then the above command is displayed. 65# 66# To put more focus on warnings, be less verbose as default 67# Use 'make V=1' to see the full commands 68 69ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71endif 72ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74endif 75 76ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79else 80 quiet=quiet_ 81 Q = @ 82endif 83 84# If the user is running make -s (silent mode), suppress echoing of 85# commands 86 87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 89 quiet=silent_ 90endif 91else # make-3.8x 92ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 93 quiet=silent_ 94endif 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is set on invocation of make in OBJ directory 115# KBUILD_SRC is not intended to be used by the regular user (for now) 116ifeq ($(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 := $(O) 122endif 123 124# That's our default target when none is given on the command line 125PHONY := _all 126_all: 127 128# Cancel implicit rules on top Makefile 129$(CURDIR)/Makefile Makefile: ; 130 131ifneq ($(KBUILD_OUTPUT),) 132# Invoke a second make in the output directory, passing relevant variables 133# check that the output directory actually exists 134saved-output := $(KBUILD_OUTPUT) 135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 136 && /bin/pwd) 137$(if $(KBUILD_OUTPUT),, \ 138 $(error failed to create output directory "$(saved-output)")) 139 140PHONY += $(MAKECMDGOALS) sub-make 141 142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 143 @: 144 145sub-make: FORCE 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 ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/sparse.txt" for more details, including 170# where to get the "sparse" utility. 171 172ifeq ("$(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 := $(M) 188endif 189 190# If building an external module we do not care about the all: rule 191# but instead _all depend on modules 192PHONY += all 193ifeq ($(KBUILD_EXTMOD),) 194_all: all 195else 196_all: modules 197endif 198 199ifeq ($(KBUILD_SRC),) 200 # building in the source tree 201 srctree := . 202else 203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 204 # building in a subdirectory of the source tree 205 srctree := .. 206 else 207 srctree := $(KBUILD_SRC) 208 endif 209endif 210objtree := . 211src := $(srctree) 212obj := $(objtree) 213 214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 215 216export srctree objtree VPATH 217 218 219# SUBARCH tells the usermode build what the underlying arch is. That is set 220# first, and if a usermode build is happening, the "ARCH=um" on the command 221# line overrides the setting of ARCH below. If a native build is happening, 222# then ARCH is assigned, getting whatever value it gets normally, and 223# SUBARCH is subsequently ignored. 224 225SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 226 -e s/sun4u/sparc64/ \ 227 -e s/arm.*/arm/ -e s/sa110/arm/ \ 228 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 229 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 230 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 231 232# Cross compiling and selecting different set of gcc/bin-utils 233# --------------------------------------------------------------------------- 234# 235# When performing cross compilation for other architectures ARCH shall be set 236# to the target architecture. (See arch/* for the possibilities). 237# ARCH can be set during invocation of make: 238# make ARCH=ia64 239# Another way is to have ARCH set in the environment. 240# The default ARCH is the host where make is executed. 241 242# CROSS_COMPILE specify the prefix used for all executables used 243# during compilation. Only gcc and related bin-utils executables 244# are prefixed with $(CROSS_COMPILE). 245# CROSS_COMPILE can be set on the command line 246# make CROSS_COMPILE=ia64-linux- 247# Alternatively CROSS_COMPILE can be set in the environment. 248# A third alternative is to store a setting in .config so that plain 249# "make" in the configured kernel build directory always uses that. 250# Default value for CROSS_COMPILE is not to prefix executables 251# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 252ARCH ?= $(SUBARCH) 253CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 254 255# Architecture as present in compile.h 256UTS_MACHINE := $(ARCH) 257SRCARCH := $(ARCH) 258 259# Additional ARCH settings for x86 260ifeq ($(ARCH),i386) 261 SRCARCH := x86 262endif 263ifeq ($(ARCH),x86_64) 264 SRCARCH := x86 265endif 266 267# Additional ARCH settings for sparc 268ifeq ($(ARCH),sparc32) 269 SRCARCH := sparc 270endif 271ifeq ($(ARCH),sparc64) 272 SRCARCH := sparc 273endif 274 275# Additional ARCH settings for sh 276ifeq ($(ARCH),sh64) 277 SRCARCH := sh 278endif 279 280# Additional ARCH settings for tile 281ifeq ($(ARCH),tilepro) 282 SRCARCH := tile 283endif 284ifeq ($(ARCH),tilegx) 285 SRCARCH := tile 286endif 287 288# Where to locate arch specific headers 289hdr-arch := $(SRCARCH) 290 291KCONFIG_CONFIG ?= .config 292export KCONFIG_CONFIG 293 294# SHELL used by kbuild 295CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 296 else if [ -x /bin/bash ]; then echo /bin/bash; \ 297 else echo sh; fi ; fi) 298 299HOSTCC = gcc 300HOSTCXX = g++ 301HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 302HOSTCXXFLAGS = -O2 303 304ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 305HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 306 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 307endif 308 309# Decide whether to build built-in, modular, or both. 310# Normally, just do built-in. 311 312KBUILD_MODULES := 313KBUILD_BUILTIN := 1 314 315# If we have only "make modules", don't compile built-in objects. 316# When we're building modules with modversions, we need to consider 317# the built-in objects during the descend as well, in order to 318# make sure the checksums are up to date before we record them. 319 320ifeq ($(MAKECMDGOALS),modules) 321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 322endif 323 324# If we have "make <whatever> modules", compile modules 325# in addition to whatever we do anyway. 326# Just "make" or "make all" shall build modules as well 327 328ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 329 KBUILD_MODULES := 1 330endif 331 332ifeq ($(MAKECMDGOALS),) 333 KBUILD_MODULES := 1 334endif 335 336export KBUILD_MODULES KBUILD_BUILTIN 337export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 338 339ifneq ($(CC),) 340ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 341COMPILER := clang 342else 343COMPILER := gcc 344endif 345export COMPILER 346endif 347 348# We need some generic definitions (do not try to remake the file). 349scripts/Kbuild.include: ; 350include scripts/Kbuild.include 351 352# Make variables (CC, etc...) 353AS = $(CROSS_COMPILE)as 354LD = $(CROSS_COMPILE)ld 355CC = $(CROSS_COMPILE)gcc 356CPP = $(CC) -E 357AR = $(CROSS_COMPILE)ar 358NM = $(CROSS_COMPILE)nm 359STRIP = $(CROSS_COMPILE)strip 360OBJCOPY = $(CROSS_COMPILE)objcopy 361OBJDUMP = $(CROSS_COMPILE)objdump 362AWK = awk 363GENKSYMS = scripts/genksyms/genksyms 364INSTALLKERNEL := installkernel 365DEPMOD = /sbin/depmod 366PERL = perl 367PYTHON = python 368CHECK = sparse 369 370CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 371 -Wbitwise -Wno-return-void $(CF) 372CFLAGS_MODULE = 373AFLAGS_MODULE = 374LDFLAGS_MODULE = 375CFLAGS_KERNEL = 376AFLAGS_KERNEL = 377CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im 378 379 380# Use USERINCLUDE when you must reference the UAPI directories only. 381USERINCLUDE := \ 382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 383 -Iarch/$(hdr-arch)/include/generated/uapi \ 384 -I$(srctree)/include/uapi \ 385 -Iinclude/generated/uapi \ 386 -include $(srctree)/include/linux/kconfig.h 387 388# Use LINUXINCLUDE when you must reference the include/ directory. 389# Needed to be compatible with the O= option 390LINUXINCLUDE := \ 391 -I$(srctree)/arch/$(hdr-arch)/include \ 392 -Iarch/$(hdr-arch)/include/generated/uapi \ 393 -Iarch/$(hdr-arch)/include/generated \ 394 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 395 -Iinclude \ 396 $(USERINCLUDE) 397 398KBUILD_CPPFLAGS := -D__KERNEL__ 399 400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 401 -fno-strict-aliasing -fno-common \ 402 -Werror-implicit-function-declaration \ 403 -Wno-format-security \ 404 -std=gnu89 405 406KBUILD_AFLAGS_KERNEL := 407KBUILD_CFLAGS_KERNEL := 408KBUILD_AFLAGS := -D__ASSEMBLY__ 409KBUILD_AFLAGS_MODULE := -DMODULE 410KBUILD_CFLAGS_MODULE := -DMODULE 411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 412 413# Read KERNELRELEASE from include/config/kernel.release (if it exists) 414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 416 417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 419export CPP AR NM STRIP OBJCOPY OBJDUMP 420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 422 423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN 425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 428export KBUILD_ARFLAGS 429 430# When compiling out-of-tree modules, put MODVERDIR in the module 431# tree rather than in the kernel tree. The kernel tree might 432# even be read-only. 433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 434 435# Files to ignore in find ... statements 436 437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 439 -prune -o 440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 441 --exclude CVS --exclude .pc --exclude .hg --exclude .git 442 443# =========================================================================== 444# Rules shared between *config targets and build targets 445 446# Basic helpers built in scripts/ 447PHONY += scripts_basic 448scripts_basic: 449 $(Q)$(MAKE) $(build)=scripts/basic 450 $(Q)rm -f .tmp_quiet_recordmcount 451 452# To avoid any implicit rule to kick in, define an empty command. 453scripts/basic/%: scripts_basic ; 454 455PHONY += outputmakefile 456# outputmakefile generates a Makefile in the output directory, if using a 457# separate output directory. This allows convenient use of make in the 458# output directory. 459outputmakefile: 460ifneq ($(KBUILD_SRC),) 461 $(Q)ln -fsn $(srctree) source 462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 464endif 465 466# Support for using generic headers in asm-generic 467PHONY += asm-generic 468asm-generic: 469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 470 src=asm obj=arch/$(SRCARCH)/include/generated/asm 471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 473 474# To make sure we do not include .config for any of the *config targets 475# catch them early, and hand them over to scripts/kconfig/Makefile 476# It is allowed to specify more targets when calling make, including 477# mixing *config targets and build targets. 478# For example 'make oldconfig all'. 479# Detect when mixed targets is specified, and make a second invocation 480# of make so .config is not included in this case either (for *config). 481 482version_h := include/generated/uapi/linux/version.h 483old_version_h := include/linux/version.h 484 485no-dot-config-targets := clean mrproper distclean \ 486 cscope gtags TAGS tags help% %docs check% coccicheck \ 487 $(version_h) headers_% archheaders archscripts \ 488 kernelversion %src-pkg 489 490config-targets := 0 491mixed-targets := 0 492dot-config := 1 493 494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 dot-config := 0 497 endif 498endif 499 500ifeq ($(KBUILD_EXTMOD),) 501 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 502 config-targets := 1 503 ifneq ($(words $(MAKECMDGOALS)),1) 504 mixed-targets := 1 505 endif 506 endif 507endif 508 509ifeq ($(mixed-targets),1) 510# =========================================================================== 511# We're called with mixed targets (*config and build targets). 512# Handle them one by one. 513 514PHONY += $(MAKECMDGOALS) __build_one_by_one 515 516$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 517 @: 518 519__build_one_by_one: 520 $(Q)set -e; \ 521 for i in $(MAKECMDGOALS); do \ 522 $(MAKE) -f $(srctree)/Makefile $$i; \ 523 done 524 525else 526ifeq ($(config-targets),1) 527# =========================================================================== 528# *config targets only - make sure prerequisites are updated, and descend 529# in scripts/kconfig to make the *config target 530 531# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 532# KBUILD_DEFCONFIG may point out an alternative default configuration 533# used for 'make defconfig' 534include arch/$(SRCARCH)/Makefile 535export KBUILD_DEFCONFIG KBUILD_KCONFIG 536 537config: scripts_basic outputmakefile FORCE 538 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 539 540%config: scripts_basic outputmakefile FORCE 541 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 542 543else 544# =========================================================================== 545# Build targets only - this includes vmlinux, arch specific targets, clean 546# targets and others. In general all targets except *config targets. 547 548ifeq ($(KBUILD_EXTMOD),) 549# Additional helpers built in scripts/ 550# Carefully list dependencies so we do not try to build scripts twice 551# in parallel 552PHONY += scripts 553scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 554 asm-generic 555 $(Q)$(MAKE) $(build)=$(@) 556 557# Objects we will link into vmlinux / subdirs we need to visit 558init-y := init/ 559drivers-y := drivers/ sound/ firmware/ 560net-y := net/ 561libs-y := lib/ 562core-y := usr/ 563endif # KBUILD_EXTMOD 564 565ifeq ($(dot-config),1) 566# Read in config 567-include include/config/auto.conf 568 569ifeq ($(KBUILD_EXTMOD),) 570# Read in dependencies to all Kconfig* files, make sure to run 571# oldconfig if changes are detected. 572-include include/config/auto.conf.cmd 573 574# To avoid any implicit rule to kick in, define an empty command 575$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 576 577# If .config is newer than include/config/auto.conf, someone tinkered 578# with it and forgot to run make oldconfig. 579# if auto.conf.cmd is missing then we are probably in a cleaned tree so 580# we execute the config step to be sure to catch updated Kconfig files 581include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 582 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 583else 584# external modules needs include/generated/autoconf.h and include/config/auto.conf 585# but do not care if they are up-to-date. Use auto.conf to trigger the test 586PHONY += include/config/auto.conf 587 588include/config/auto.conf: 589 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 590 echo >&2; \ 591 echo >&2 " ERROR: Kernel configuration is invalid."; \ 592 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 593 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 594 echo >&2 ; \ 595 /bin/false) 596 597endif # KBUILD_EXTMOD 598 599else 600# Dummy target needed, because used as prerequisite 601include/config/auto.conf: ; 602endif # $(dot-config) 603 604# The all: target is the default when no target is given on the 605# command line. 606# This allow a user to issue only 'make' to build a kernel including modules 607# Defaults to vmlinux, but the arch makefile usually adds further targets 608all: vmlinux 609 610include arch/$(SRCARCH)/Makefile 611 612KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 613 614ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 615KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 616else 617KBUILD_CFLAGS += -O2 618endif 619 620# Tell gcc to never replace conditional load with a non-conditional one 621KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 622 623ifdef CONFIG_READABLE_ASM 624# Disable optimizations that make assembler listings hard to read. 625# reorder blocks reorders the control in the function 626# ipa clone creates specialized cloned functions 627# partial inlining inlines only parts of functions 628KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 629 $(call cc-option,-fno-ipa-cp-clone,) \ 630 $(call cc-option,-fno-partial-inlining) 631endif 632 633ifneq ($(CONFIG_FRAME_WARN),0) 634KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 635endif 636 637# Handle stack protector mode. 638# 639# Since kbuild can potentially perform two passes (first with the old 640# .config values and then with updated .config values), we cannot error out 641# if a desired compiler option is unsupported. If we were to error, kbuild 642# could never get to the second pass and actually notice that we changed 643# the option to something that was supported. 644# 645# Additionally, we don't want to fallback and/or silently change which compiler 646# flags will be used, since that leads to producing kernels with different 647# security feature characteristics depending on the compiler used. ("But I 648# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 649# 650# The middle ground is to warn here so that the failed option is obvious, but 651# to let the build fail with bad compiler flags so that we can't produce a 652# kernel when there is a CONFIG and compiler mismatch. 653# 654ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 655 stackp-flag := -fstack-protector 656 ifeq ($(call cc-option, $(stackp-flag)),) 657 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 658 -fstack-protector not supported by compiler) 659 endif 660else 661ifdef CONFIG_CC_STACKPROTECTOR_STRONG 662 stackp-flag := -fstack-protector-strong 663 ifeq ($(call cc-option, $(stackp-flag)),) 664 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 665 -fstack-protector-strong not supported by compiler) 666 endif 667else 668 # Force off for distro compilers that enable stack protector by default. 669 stackp-flag := $(call cc-option, -fno-stack-protector) 670endif 671endif 672KBUILD_CFLAGS += $(stackp-flag) 673 674ifeq ($(COMPILER),clang) 675KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 676KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 677KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 678KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 679KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 680# Quiet clang warning: comparison of unsigned expression < 0 is always false 681KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 682# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 683# source of a reference will be _MergedGlobals and not on of the whitelisted names. 684# See modpost pattern 2 685KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 686KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 687else 688 689# These warnings generated too much noise in a regular build. 690# Use make W=1 to enable them (see scripts/Makefile.build) 691KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 692KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 693endif 694 695ifdef CONFIG_FRAME_POINTER 696KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 697else 698# Some targets (ARM with Thumb2, for example), can't be built with frame 699# pointers. For those, we don't have FUNCTION_TRACER automatically 700# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 701# incompatible with -fomit-frame-pointer with current GCC, so we don't use 702# -fomit-frame-pointer with FUNCTION_TRACER. 703ifndef CONFIG_FUNCTION_TRACER 704KBUILD_CFLAGS += -fomit-frame-pointer 705endif 706endif 707 708KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 709 710ifdef CONFIG_DEBUG_INFO 711ifdef CONFIG_DEBUG_INFO_SPLIT 712KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 713else 714KBUILD_CFLAGS += -g 715endif 716KBUILD_AFLAGS += -Wa,-gdwarf-2 717endif 718ifdef CONFIG_DEBUG_INFO_DWARF4 719KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 720endif 721 722ifdef CONFIG_DEBUG_INFO_REDUCED 723KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 724 $(call cc-option,-fno-var-tracking) 725endif 726 727ifdef CONFIG_FUNCTION_TRACER 728ifndef CC_FLAGS_FTRACE 729CC_FLAGS_FTRACE := -pg 730endif 731export CC_FLAGS_FTRACE 732ifdef CONFIG_HAVE_FENTRY 733CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 734endif 735KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 736KBUILD_AFLAGS += $(CC_USING_FENTRY) 737ifdef CONFIG_DYNAMIC_FTRACE 738 ifdef CONFIG_HAVE_C_RECORDMCOUNT 739 BUILD_C_RECORDMCOUNT := y 740 export BUILD_C_RECORDMCOUNT 741 endif 742endif 743endif 744 745# We trigger additional mismatches with less inlining 746ifdef CONFIG_DEBUG_SECTION_MISMATCH 747KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 748endif 749 750# arch Makefile may override CC so keep this after arch Makefile is included 751NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 752CHECKFLAGS += $(NOSTDINC_FLAGS) 753 754# warn about C99 declaration after statement 755KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 756 757# disable pointer signed / unsigned warnings in gcc 4.0 758KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 759 760# disable invalid "can't wrap" optimizations for signed / pointers 761KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 762 763# conserve stack if available 764KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 765 766# disallow errors like 'EXPORT_GPL(foo);' with missing header 767KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 768 769# require functions to have arguments in prototypes, not empty 'int foo()' 770KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 771 772# Prohibit date/time macros, which would make the build non-deterministic 773KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 774 775# use the deterministic mode of AR if available 776KBUILD_ARFLAGS := $(call ar-option,D) 777 778# check for 'asm goto' 779ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 780 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 781 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 782endif 783 784include scripts/Makefile.kasan 785include scripts/Makefile.extrawarn 786 787# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 788# last assignments 789KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 790KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 791KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 792 793# Use --build-id when available. 794LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 795 $(call cc-ldoption, -Wl$(comma)--build-id,)) 796KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 797LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 798 799ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 800LDFLAGS_vmlinux += $(call ld-option, -X,) 801endif 802 803# Default kernel image to build when no specific target is given. 804# KBUILD_IMAGE may be overruled on the command line or 805# set in the environment 806# Also any assignments in arch/$(ARCH)/Makefile take precedence over 807# this default value 808export KBUILD_IMAGE ?= vmlinux 809 810# 811# INSTALL_PATH specifies where to place the updated kernel and system map 812# images. Default is /boot, but you can set it to other values 813export INSTALL_PATH ?= /boot 814 815# 816# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 817# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 818# an argument if needed. Otherwise it defaults to the kernel install path 819# 820export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 821 822# 823# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 824# relocations required by build roots. This is not defined in the 825# makefile but the argument can be passed to make if needed. 826# 827 828MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 829export MODLIB 830 831# 832# INSTALL_MOD_STRIP, if defined, will cause modules to be 833# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 834# the default option --strip-debug will be used. Otherwise, 835# INSTALL_MOD_STRIP value will be used as the options to the strip command. 836 837ifdef INSTALL_MOD_STRIP 838ifeq ($(INSTALL_MOD_STRIP),1) 839mod_strip_cmd = $(STRIP) --strip-debug 840else 841mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 842endif # INSTALL_MOD_STRIP=1 843else 844mod_strip_cmd = true 845endif # INSTALL_MOD_STRIP 846export mod_strip_cmd 847 848# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 849# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 850# or CONFIG_MODULE_COMPRESS_XZ. 851 852mod_compress_cmd = true 853ifdef CONFIG_MODULE_COMPRESS 854 ifdef CONFIG_MODULE_COMPRESS_GZIP 855 mod_compress_cmd = gzip -n 856 endif # CONFIG_MODULE_COMPRESS_GZIP 857 ifdef CONFIG_MODULE_COMPRESS_XZ 858 mod_compress_cmd = xz 859 endif # CONFIG_MODULE_COMPRESS_XZ 860endif # CONFIG_MODULE_COMPRESS 861export mod_compress_cmd 862 863# Select initial ramdisk compression format, default is gzip(1). 864# This shall be used by the dracut(8) tool while creating an initramfs image. 865# 866INITRD_COMPRESS-y := gzip 867INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 868INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 869INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 870INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 871INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 872# do not export INITRD_COMPRESS, since we didn't actually 873# choose a sane default compression above. 874# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 875 876ifdef CONFIG_MODULE_SIG_ALL 877MODSECKEY = ./signing_key.priv 878MODPUBKEY = ./signing_key.x509 879export MODPUBKEY 880mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 881else 882mod_sign_cmd = true 883endif 884export mod_sign_cmd 885 886 887ifeq ($(KBUILD_EXTMOD),) 888core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 889 890vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 891 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 892 $(net-y) $(net-m) $(libs-y) $(libs-m))) 893 894vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 895 $(init-) $(core-) $(drivers-) $(net-) $(libs-)))) 896 897init-y := $(patsubst %/, %/built-in.o, $(init-y)) 898core-y := $(patsubst %/, %/built-in.o, $(core-y)) 899drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 900net-y := $(patsubst %/, %/built-in.o, $(net-y)) 901libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 902libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 903libs-y := $(libs-y1) $(libs-y2) 904 905# Externally visible symbols (used by link-vmlinux.sh) 906export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 907export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 908export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 909export LDFLAGS_vmlinux 910# used by scripts/pacmage/Makefile 911export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 912 913vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 914 915# Final link of vmlinux 916 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 917quiet_cmd_link-vmlinux = LINK $@ 918 919# Include targets which we want to 920# execute if the rest of the kernel build went well. 921vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 922ifdef CONFIG_HEADERS_CHECK 923 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 924endif 925ifdef CONFIG_SAMPLES 926 $(Q)$(MAKE) $(build)=samples 927endif 928ifdef CONFIG_BUILD_DOCSRC 929 $(Q)$(MAKE) $(build)=Documentation 930endif 931ifdef CONFIG_GDB_SCRIPTS 932 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 933endif 934 +$(call if_changed,link-vmlinux) 935 936# The actual objects are generated when descending, 937# make sure no implicit rule kicks in 938$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 939 940# Handle descending into subdirectories listed in $(vmlinux-dirs) 941# Preset locale variables to speed up the build process. Limit locale 942# tweaks to this spot to avoid wrong language settings when running 943# make menuconfig etc. 944# Error messages still appears in the original language 945 946PHONY += $(vmlinux-dirs) 947$(vmlinux-dirs): prepare scripts 948 $(Q)$(MAKE) $(build)=$@ 949 950define filechk_kernel.release 951 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 952endef 953 954# Store (new) KERNELRELEASE string in include/config/kernel.release 955include/config/kernel.release: include/config/auto.conf FORCE 956 $(call filechk,kernel.release) 957 958 959# Things we need to do before we recursively start building the kernel 960# or the modules are listed in "prepare". 961# A multi level approach is used. prepareN is processed before prepareN-1. 962# archprepare is used in arch Makefiles and when processed asm symlink, 963# version.h and scripts_basic is processed / created. 964 965# Listed in dependency order 966PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 967 968# prepare3 is used to check if we are building in a separate output directory, 969# and if so do: 970# 1) Check that make has not been executed in the kernel src $(srctree) 971prepare3: include/config/kernel.release 972ifneq ($(KBUILD_SRC),) 973 @$(kecho) ' Using $(srctree) as source for kernel' 974 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 975 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 976 echo >&2 " in the '$(srctree)' directory.";\ 977 /bin/false; \ 978 fi; 979endif 980 981# prepare2 creates a makefile if using a separate output directory 982prepare2: prepare3 outputmakefile asm-generic 983 984prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 985 include/config/auto.conf 986 $(cmd_crmodverdir) 987 988archprepare: archheaders archscripts prepare1 scripts_basic 989 990prepare0: archprepare FORCE 991 $(Q)$(MAKE) $(build)=. 992 993# All the preparing.. 994prepare: prepare0 995 996# Generate some files 997# --------------------------------------------------------------------------- 998 999# KERNELRELEASE can change from a few different places, meaning version.h 1000# needs to be updated, so this check is forced on all builds 1001 1002uts_len := 64 1003define filechk_utsrelease.h 1004 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1005 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1006 exit 1; \ 1007 fi; \ 1008 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1009endef 1010 1011define filechk_version.h 1012 (echo \#define LINUX_VERSION_CODE $(shell \ 1013 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1014 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1015endef 1016 1017$(version_h): $(srctree)/Makefile FORCE 1018 $(call filechk,version.h) 1019 $(Q)rm -f $(old_version_h) 1020 1021include/generated/utsrelease.h: include/config/kernel.release FORCE 1022 $(call filechk,utsrelease.h) 1023 1024PHONY += headerdep 1025headerdep: 1026 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1027 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1028 1029# --------------------------------------------------------------------------- 1030# Firmware install 1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1032export INSTALL_FW_PATH 1033 1034PHONY += firmware_install 1035firmware_install: FORCE 1036 @mkdir -p $(objtree)/firmware 1037 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1038 1039# --------------------------------------------------------------------------- 1040# Kernel headers 1041 1042#Default location for installed headers 1043export INSTALL_HDR_PATH = $(objtree)/usr 1044 1045# If we do an all arch process set dst to asm-$(hdr-arch) 1046hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1047 1048PHONY += archheaders 1049archheaders: 1050 1051PHONY += archscripts 1052archscripts: 1053 1054PHONY += __headers 1055__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1056 $(Q)$(MAKE) $(build)=scripts build_unifdef 1057 1058PHONY += headers_install_all 1059headers_install_all: 1060 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1061 1062PHONY += headers_install 1063headers_install: __headers 1064 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1065 $(error Headers not exportable for the $(SRCARCH) architecture)) 1066 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1067 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1068 1069PHONY += headers_check_all 1070headers_check_all: headers_install_all 1071 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1072 1073PHONY += headers_check 1074headers_check: headers_install 1075 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1076 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1077 1078# --------------------------------------------------------------------------- 1079# Kernel selftest 1080 1081PHONY += kselftest 1082kselftest: 1083 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1084 1085# --------------------------------------------------------------------------- 1086# Modules 1087 1088ifdef CONFIG_MODULES 1089 1090# By default, build modules as well 1091 1092all: modules 1093 1094# Build modules 1095# 1096# A module can be listed more than once in obj-m resulting in 1097# duplicate lines in modules.order files. Those are removed 1098# using awk while concatenating to the final file. 1099 1100PHONY += modules 1101modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1102 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1103 @$(kecho) ' Building modules, stage 2.'; 1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1105 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1106 1107modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1108 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1109 1110%/modules.builtin: include/config/auto.conf 1111 $(Q)$(MAKE) $(modbuiltin)=$* 1112 1113 1114# Target to prepare building external modules 1115PHONY += modules_prepare 1116modules_prepare: prepare scripts 1117 1118# Target to install modules 1119PHONY += modules_install 1120modules_install: _modinst_ _modinst_post 1121 1122PHONY += _modinst_ 1123_modinst_: 1124 @rm -rf $(MODLIB)/kernel 1125 @rm -f $(MODLIB)/source 1126 @mkdir -p $(MODLIB)/kernel 1127 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1128 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1129 rm -f $(MODLIB)/build ; \ 1130 ln -s $(CURDIR) $(MODLIB)/build ; \ 1131 fi 1132 @cp -f $(objtree)/modules.order $(MODLIB)/ 1133 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1135 1136# This depmod is only for convenience to give the initial 1137# boot a modules.dep even before / is mounted read-write. However the 1138# boot script depmod is the master version. 1139PHONY += _modinst_post 1140_modinst_post: _modinst_ 1141 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1142 $(call cmd,depmod) 1143 1144ifeq ($(CONFIG_MODULE_SIG), y) 1145PHONY += modules_sign 1146modules_sign: 1147 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1148endif 1149 1150else # CONFIG_MODULES 1151 1152# Modules not configured 1153# --------------------------------------------------------------------------- 1154 1155modules modules_install: FORCE 1156 @echo >&2 1157 @echo >&2 "The present kernel configuration has modules disabled." 1158 @echo >&2 "Type 'make config' and enable loadable module support." 1159 @echo >&2 "Then build a kernel with module support enabled." 1160 @echo >&2 1161 @exit 1 1162 1163endif # CONFIG_MODULES 1164 1165### 1166# Cleaning is done on three levels. 1167# make clean Delete most generated files 1168# Leave enough to build external modules 1169# make mrproper Delete the current configuration, and all generated files 1170# make distclean Remove editor backup files, patch leftover files and the like 1171 1172# Directories & files removed with 'make clean' 1173CLEAN_DIRS += $(MODVERDIR) 1174 1175# Directories & files removed with 'make mrproper' 1176MRPROPER_DIRS += include/config usr/include include/generated \ 1177 arch/*/include/generated .tmp_objdiff 1178MRPROPER_FILES += .config .config.old .version .old_version \ 1179 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1180 signing_key.priv signing_key.x509 x509.genkey \ 1181 extra_certificates signing_key.x509.keyid \ 1182 signing_key.x509.signer vmlinux-gdb.py 1183 1184# clean - Delete most, but leave enough to build external modules 1185# 1186clean: rm-dirs := $(CLEAN_DIRS) 1187clean: rm-files := $(CLEAN_FILES) 1188clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1189 1190PHONY += $(clean-dirs) clean archclean vmlinuxclean 1191$(clean-dirs): 1192 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1193 1194vmlinuxclean: 1195 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1196 1197clean: archclean vmlinuxclean 1198 1199# mrproper - Delete all generated files, including .config 1200# 1201mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1202mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1203mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1204 1205PHONY += $(mrproper-dirs) mrproper archmrproper 1206$(mrproper-dirs): 1207 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1208 1209mrproper: clean archmrproper $(mrproper-dirs) 1210 $(call cmd,rmdirs) 1211 $(call cmd,rmfiles) 1212 1213# distclean 1214# 1215PHONY += distclean 1216 1217distclean: mrproper 1218 @find $(srctree) $(RCS_FIND_IGNORE) \ 1219 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1220 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1221 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1222 -type f -print | xargs rm -f 1223 1224 1225# Packaging of the kernel to various formats 1226# --------------------------------------------------------------------------- 1227# rpm target kept for backward compatibility 1228package-dir := scripts/package 1229 1230%src-pkg: FORCE 1231 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1232%pkg: include/config/kernel.release FORCE 1233 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1234rpm: include/config/kernel.release FORCE 1235 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1236 1237 1238# Brief documentation of the typical targets used 1239# --------------------------------------------------------------------------- 1240 1241boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1242boards := $(sort $(notdir $(boards))) 1243board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1244board-dirs := $(sort $(notdir $(board-dirs:/=))) 1245 1246help: 1247 @echo 'Cleaning targets:' 1248 @echo ' clean - Remove most generated files but keep the config and' 1249 @echo ' enough build support to build external modules' 1250 @echo ' mrproper - Remove all generated files + config + various backup files' 1251 @echo ' distclean - mrproper + remove editor backup and patch files' 1252 @echo '' 1253 @echo 'Configuration targets:' 1254 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1255 @echo '' 1256 @echo 'Other generic targets:' 1257 @echo ' all - Build all targets marked with [*]' 1258 @echo '* vmlinux - Build the bare kernel' 1259 @echo '* modules - Build all modules' 1260 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1261 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1262 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1263 @echo ' dir/ - Build all files in dir and below' 1264 @echo ' dir/file.[oisS] - Build specified target only' 1265 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1266 @echo ' (requires a recent binutils and recent build (System.map))' 1267 @echo ' dir/file.ko - Build module including final link' 1268 @echo ' modules_prepare - Set up for building external modules' 1269 @echo ' tags/TAGS - Generate tags file for editors' 1270 @echo ' cscope - Generate cscope index' 1271 @echo ' gtags - Generate GNU GLOBAL index' 1272 @echo ' kernelrelease - Output the release version string (use with make -s)' 1273 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1274 @echo ' image_name - Output the image name (use with make -s)' 1275 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1276 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1277 echo '' 1278 @echo 'Static analysers' 1279 @echo ' checkstack - Generate a list of stack hogs' 1280 @echo ' namespacecheck - Name space analysis on compiled kernel' 1281 @echo ' versioncheck - Sanity check on version.h usage' 1282 @echo ' includecheck - Check for duplicate included header files' 1283 @echo ' export_report - List the usages of all exported symbols' 1284 @echo ' headers_check - Sanity check on exported headers' 1285 @echo ' headerdep - Detect inclusion cycles in headers' 1286 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1287 @echo '' 1288 @echo 'Kernel selftest' 1289 @echo ' kselftest - Build and run kernel selftest (run as root)' 1290 @echo ' Build, install, and boot kernel before' 1291 @echo ' running kselftest on it' 1292 @echo '' 1293 @echo 'Kernel packaging:' 1294 @$(MAKE) $(build)=$(package-dir) help 1295 @echo '' 1296 @echo 'Documentation targets:' 1297 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1298 @echo '' 1299 @echo 'Architecture specific targets ($(SRCARCH)):' 1300 @$(if $(archhelp),$(archhelp),\ 1301 echo ' No architecture specific help defined for $(SRCARCH)') 1302 @echo '' 1303 @$(if $(boards), \ 1304 $(foreach b, $(boards), \ 1305 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1306 echo '') 1307 @$(if $(board-dirs), \ 1308 $(foreach b, $(board-dirs), \ 1309 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1310 printf " %-16s - Show all of the above\\n" help-boards; \ 1311 echo '') 1312 1313 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1314 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1315 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1316 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1317 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1318 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1319 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1320 @echo ' 1: warnings which may be relevant and do not occur too often' 1321 @echo ' 2: warnings which occur quite often but may still be relevant' 1322 @echo ' 3: more obscure warnings, can most likely be ignored' 1323 @echo ' Multiple levels can be combined with W=12 or W=123' 1324 @echo '' 1325 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1326 @echo 'For further info see the ./README file' 1327 1328 1329help-board-dirs := $(addprefix help-,$(board-dirs)) 1330 1331help-boards: $(help-board-dirs) 1332 1333boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1334 1335$(help-board-dirs): help-%: 1336 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1337 @$(if $(boards-per-dir), \ 1338 $(foreach b, $(boards-per-dir), \ 1339 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1340 echo '') 1341 1342 1343# Documentation targets 1344# --------------------------------------------------------------------------- 1345%docs: scripts_basic FORCE 1346 $(Q)$(MAKE) $(build)=scripts build_docproc 1347 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1348 1349else # KBUILD_EXTMOD 1350 1351### 1352# External module support. 1353# When building external modules the kernel used as basis is considered 1354# read-only, and no consistency checks are made and the make 1355# system is not used on the basis kernel. If updates are required 1356# in the basis kernel ordinary make commands (without M=...) must 1357# be used. 1358# 1359# The following are the only valid targets when building external 1360# modules. 1361# make M=dir clean Delete all automatically generated files 1362# make M=dir modules Make all modules in specified dir 1363# make M=dir Same as 'make M=dir modules' 1364# make M=dir modules_install 1365# Install the modules built in the module directory 1366# Assumes install directory is already created 1367 1368# We are always building modules 1369KBUILD_MODULES := 1 1370PHONY += crmodverdir 1371crmodverdir: 1372 $(cmd_crmodverdir) 1373 1374PHONY += $(objtree)/Module.symvers 1375$(objtree)/Module.symvers: 1376 @test -e $(objtree)/Module.symvers || ( \ 1377 echo; \ 1378 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1379 echo " is missing; modules will have no dependencies and modversions."; \ 1380 echo ) 1381 1382module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1383PHONY += $(module-dirs) modules 1384$(module-dirs): crmodverdir $(objtree)/Module.symvers 1385 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1386 1387modules: $(module-dirs) 1388 @$(kecho) ' Building modules, stage 2.'; 1389 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1390 1391PHONY += modules_install 1392modules_install: _emodinst_ _emodinst_post 1393 1394install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1395PHONY += _emodinst_ 1396_emodinst_: 1397 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1398 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1399 1400PHONY += _emodinst_post 1401_emodinst_post: _emodinst_ 1402 $(call cmd,depmod) 1403 1404clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1405 1406PHONY += $(clean-dirs) clean 1407$(clean-dirs): 1408 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1409 1410clean: rm-dirs := $(MODVERDIR) 1411clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1412 1413help: 1414 @echo ' Building external modules.' 1415 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1416 @echo '' 1417 @echo ' modules - default target, build the module(s)' 1418 @echo ' modules_install - install the module' 1419 @echo ' clean - remove generated files in module directory only' 1420 @echo '' 1421 1422# Dummies... 1423PHONY += prepare scripts 1424prepare: ; 1425scripts: ; 1426endif # KBUILD_EXTMOD 1427 1428clean: $(clean-dirs) 1429 $(call cmd,rmdirs) 1430 $(call cmd,rmfiles) 1431 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1432 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1433 -o -name '*.ko.*' \ 1434 -o -name '*.dwo' \ 1435 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1436 -o -name '*.symtypes' -o -name 'modules.order' \ 1437 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1438 -o -name '*.gcno' \) -type f -print | xargs rm -f 1439 1440# Generate tags for editors 1441# --------------------------------------------------------------------------- 1442quiet_cmd_tags = GEN $@ 1443 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1444 1445tags TAGS cscope gtags: FORCE 1446 $(call cmd,tags) 1447 1448# Scripts to check various things for consistency 1449# --------------------------------------------------------------------------- 1450 1451PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1452 1453includecheck: 1454 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1455 -name '*.[hcS]' -type f -print | sort \ 1456 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1457 1458versioncheck: 1459 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1460 -name '*.[hcS]' -type f -print | sort \ 1461 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1462 1463coccicheck: 1464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1465 1466namespacecheck: 1467 $(PERL) $(srctree)/scripts/namespace.pl 1468 1469export_report: 1470 $(PERL) $(srctree)/scripts/export_report.pl 1471 1472endif #ifeq ($(config-targets),1) 1473endif #ifeq ($(mixed-targets),1) 1474 1475PHONY += checkstack kernelrelease kernelversion image_name 1476 1477# UML needs a little special treatment here. It wants to use the host 1478# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1479# else wants $(ARCH), including people doing cross-builds, which means 1480# that $(SUBARCH) doesn't work here. 1481ifeq ($(ARCH), um) 1482CHECKSTACK_ARCH := $(SUBARCH) 1483else 1484CHECKSTACK_ARCH := $(ARCH) 1485endif 1486checkstack: 1487 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1488 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1489 1490kernelrelease: 1491 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1492 1493kernelversion: 1494 @echo $(KERNELVERSION) 1495 1496image_name: 1497 @echo $(KBUILD_IMAGE) 1498 1499# Clear a bunch of variables before executing the submake 1500tools/: FORCE 1501 $(Q)mkdir -p $(objtree)/tools 1502 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1503 1504tools/%: FORCE 1505 $(Q)mkdir -p $(objtree)/tools 1506 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1507 1508# Single targets 1509# --------------------------------------------------------------------------- 1510# Single targets are compatible with: 1511# - build with mixed source and output 1512# - build with separate output dir 'make O=...' 1513# - external modules 1514# 1515# target-dir => where to store outputfile 1516# build-dir => directory in kernel source tree to use 1517 1518ifeq ($(KBUILD_EXTMOD),) 1519 build-dir = $(patsubst %/,%,$(dir $@)) 1520 target-dir = $(dir $@) 1521else 1522 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1523 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1524 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1525endif 1526 1527%.s: %.c prepare scripts FORCE 1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1529%.i: %.c prepare scripts FORCE 1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1531%.o: %.c prepare scripts FORCE 1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1533%.lst: %.c prepare scripts FORCE 1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1535%.s: %.S prepare scripts FORCE 1536 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1537%.o: %.S prepare scripts FORCE 1538 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1539%.symtypes: %.c prepare scripts FORCE 1540 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1541 1542# Modules 1543/: prepare scripts FORCE 1544 $(cmd_crmodverdir) 1545 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1546 $(build)=$(build-dir) 1547# Make sure the latest headers are built for Documentation 1548Documentation/: headers_install 1549%/: prepare scripts FORCE 1550 $(cmd_crmodverdir) 1551 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1552 $(build)=$(build-dir) 1553%.ko: prepare scripts FORCE 1554 $(cmd_crmodverdir) 1555 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1556 $(build)=$(build-dir) $(@:.ko=.o) 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1558 1559# FIXME Should go into a make.lib or something 1560# =========================================================================== 1561 1562quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1563 cmd_rmdirs = rm -rf $(rm-dirs) 1564 1565quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1566 cmd_rmfiles = rm -f $(rm-files) 1567 1568# Run depmod only if we have System.map and depmod is executable 1569quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1570 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1571 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1572 1573# Create temporary dir for module support files 1574# clean it up only when building all modules 1575cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1576 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1577 1578# read all saved command lines 1579 1580targets := $(wildcard $(sort $(targets))) 1581cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1582 1583ifneq ($(cmd_files),) 1584 $(cmd_files): ; # Do not try to update included dependency files 1585 include $(cmd_files) 1586endif 1587 1588endif # skip-makefile 1589 1590PHONY += FORCE 1591FORCE: 1592 1593# Declare the contents of the .PHONY variable as phony. We keep that 1594# information in a variable so we can use it in if_changed and friends. 1595.PHONY: $(PHONY) 1596