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1# SPDX-License-Identifier: GPL-2.0
2VERSION = 4
3PATCHLEVEL = 15
4SUBLEVEL = 18
5EXTRAVERSION =
6NAME = Fearless Coyote
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# o Do not use make's built-in rules and variables
19# (this increases performance and avoids hard-to-debug behaviour);
20# o Look for make include files relative to root of kernel src
21MAKEFLAGS += -rR --include-dir=$(CURDIR)
22
23# Avoid funny character set dependencies
24unexport LC_ALL
25LC_COLLATE=C
26LC_NUMERIC=C
27export LC_COLLATE LC_NUMERIC
28
29# Avoid interference with shell env settings
30unexport GREP_OPTIONS
31
32# We are using a recursive build, so we need to do a little thinking
33# to get the ordering right.
34#
35# Most importantly: sub-Makefiles should only ever modify files in
36# their own directory. If in some directory we have a dependency on
37# a file in another dir (which doesn't happen often, but it's often
38# unavoidable when linking the built-in.o targets which finally
39# turn into vmlinux), we will call a sub make in that other dir, and
40# after that we are sure that everything which is in that other dir
41# is now up to date.
42#
43# The only cases where we need to modify files which have global
44# effects are thus separated out and done before the recursive
45# descending is started. They are now explicitly listed as the
46# prepare rule.
47
48# Beautify output
49# ---------------------------------------------------------------------------
50#
51# Normally, we echo the whole command before executing it. By making
52# that echo $($(quiet)$(cmd)), we now have the possibility to set
53# $(quiet) to choose other forms of output instead, e.g.
54#
55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
57#
58# If $(quiet) is empty, the whole command will be printed.
59# If it is set to "quiet_", only the short version will be printed.
60# If it is set to "silent_", nothing will be printed at all, since
61# the variable $(silent_cmd_cc_o_c) doesn't exist.
62#
63# A simple variant is to prefix commands with $(Q) - that's useful
64# for commands that shall be hidden in non-verbose mode.
65#
66# $(Q)ln $@ :<
67#
68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
70#
71# To put more focus on warnings, be less verbose as default
72# Use 'make V=1' to see the full commands
73
74ifeq ("$(origin V)", "command line")
75 KBUILD_VERBOSE = $(V)
76endif
77ifndef KBUILD_VERBOSE
78 KBUILD_VERBOSE = 0
79endif
80
81ifeq ($(KBUILD_VERBOSE),1)
82 quiet =
83 Q =
84else
85 quiet=quiet_
86 Q = @
87endif
88
89# If the user is running make -s (silent mode), suppress echoing of
90# commands
91
92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
93 quiet=silent_
94 tools_silent=s
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is not intended to be used by the regular user (for now),
115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124# Cancel implicit rules on top Makefile
125$(CURDIR)/Makefile Makefile: ;
126
127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128 $(error main directory cannot contain spaces nor colons)
129endif
130
131ifneq ($(KBUILD_OUTPUT),)
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135 && pwd)
136$(if $(KBUILD_OUTPUT),, \
137 $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142 @:
143
144# Invoke a second make in the output directory, passing relevant variables
145sub-make:
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/dev-tools/sparse.rst" for more details,
170# including where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Call message checker as part of the C compilation
180#
181# Use 'make D=1' to enable checking
182# Use 'make D=2' to create the message catalog
183
184ifdef D
185 ifeq ("$(origin D)", "command line")
186 KBUILD_KMSG_CHECK = $(D)
187 endif
188endif
189ifndef KBUILD_KMSG_CHECK
190 KBUILD_KMSG_CHECK = 0
191endif
192
193# Use make M=dir to specify directory of external module to build
194# Old syntax make ... SUBDIRS=$PWD is still supported
195# Setting the environment variable KBUILD_EXTMOD take precedence
196ifdef SUBDIRS
197 KBUILD_EXTMOD ?= $(SUBDIRS)
198endif
199
200ifeq ("$(origin M)", "command line")
201 KBUILD_EXTMOD := $(M)
202endif
203
204ifeq ($(KBUILD_SRC),)
205 # building in the source tree
206 srctree := .
207else
208 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
209 # building in a subdirectory of the source tree
210 srctree := ..
211 else
212 srctree := $(KBUILD_SRC)
213 endif
214endif
215
216export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
217
218objtree := .
219src := $(srctree)
220obj := $(objtree)
221
222VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
223
224export srctree objtree VPATH
225
226# To make sure we do not include .config for any of the *config targets
227# catch them early, and hand them over to scripts/kconfig/Makefile
228# It is allowed to specify more targets when calling make, including
229# mixing *config targets and build targets.
230# For example 'make oldconfig all'.
231# Detect when mixed targets is specified, and make a second invocation
232# of make so .config is not included in this case either (for *config).
233
234version_h := include/generated/uapi/linux/version.h
235old_version_h := include/linux/version.h
236
237no-dot-config-targets := clean mrproper distclean \
238 cscope gtags TAGS tags help% %docs check% coccicheck \
239 $(version_h) headers_% archheaders archscripts \
240 kernelversion %src-pkg
241no-sync-config-targets := $(no-dot-config-targets) install %install
242
243config-targets := 0
244mixed-targets := 0
245dot-config := 1
246may-sync-config := 1
247
248ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
249 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
250 dot-config := 0
251 endif
252endif
253
254ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
255 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
256 may-sync-config := 0
257 endif
258endif
259
260ifneq ($(KBUILD_EXTMOD),)
261 may-sync-config := 0
262endif
263
264ifeq ($(KBUILD_EXTMOD),)
265 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
266 config-targets := 1
267 ifneq ($(words $(MAKECMDGOALS)),1)
268 mixed-targets := 1
269 endif
270 endif
271endif
272# install and modules_install need also be processed one by one
273ifneq ($(filter install,$(MAKECMDGOALS)),)
274 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
275 mixed-targets := 1
276 endif
277endif
278
279ifeq ($(mixed-targets),1)
280# ===========================================================================
281# We're called with mixed targets (*config and build targets).
282# Handle them one by one.
283
284PHONY += $(MAKECMDGOALS) __build_one_by_one
285
286$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
287 @:
288
289__build_one_by_one:
290 $(Q)set -e; \
291 for i in $(MAKECMDGOALS); do \
292 $(MAKE) -f $(srctree)/Makefile $$i; \
293 done
294
295else
296
297# We need some generic definitions (do not try to remake the file).
298scripts/Kbuild.include: ;
299include scripts/Kbuild.include
300
301# Read KERNELRELEASE from include/config/kernel.release (if it exists)
302KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
303KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
304export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
305
306include scripts/subarch.include
307
308# Cross compiling and selecting different set of gcc/bin-utils
309# ---------------------------------------------------------------------------
310#
311# When performing cross compilation for other architectures ARCH shall be set
312# to the target architecture. (See arch/* for the possibilities).
313# ARCH can be set during invocation of make:
314# make ARCH=ia64
315# Another way is to have ARCH set in the environment.
316# The default ARCH is the host where make is executed.
317
318# CROSS_COMPILE specify the prefix used for all executables used
319# during compilation. Only gcc and related bin-utils executables
320# are prefixed with $(CROSS_COMPILE).
321# CROSS_COMPILE can be set on the command line
322# make CROSS_COMPILE=ia64-linux-
323# Alternatively CROSS_COMPILE can be set in the environment.
324# A third alternative is to store a setting in .config so that plain
325# "make" in the configured kernel build directory always uses that.
326# Default value for CROSS_COMPILE is not to prefix executables
327# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
328ARCH ?= $(SUBARCH)
329CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
330
331# Architecture as present in compile.h
332UTS_MACHINE := $(ARCH)
333SRCARCH := $(ARCH)
334
335# Additional ARCH settings for x86
336ifeq ($(ARCH),i386)
337 SRCARCH := x86
338endif
339ifeq ($(ARCH),x86_64)
340 SRCARCH := x86
341endif
342
343# Additional ARCH settings for sparc
344ifeq ($(ARCH),sparc32)
345 SRCARCH := sparc
346endif
347ifeq ($(ARCH),sparc64)
348 SRCARCH := sparc
349endif
350
351# Additional ARCH settings for sh
352ifeq ($(ARCH),sh64)
353 SRCARCH := sh
354endif
355
356# Additional ARCH settings for tile
357ifeq ($(ARCH),tilepro)
358 SRCARCH := tile
359endif
360ifeq ($(ARCH),tilegx)
361 SRCARCH := tile
362endif
363
364KCONFIG_CONFIG ?= .config
365export KCONFIG_CONFIG
366
367# SHELL used by kbuild
368CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
369 else if [ -x /bin/bash ]; then echo /bin/bash; \
370 else echo sh; fi ; fi)
371
372HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
373HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
374HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
375
376HOSTCC = gcc
377HOSTCXX = g++
378HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
379 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
380HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
381HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
382HOST_LOADLIBES := $(HOST_LFS_LIBS)
383
384# Make variables (CC, etc...)
385AS = $(CROSS_COMPILE)as
386LD = $(CROSS_COMPILE)ld
387CC = $(CROSS_COMPILE)gcc
388CPP = $(CC) -E
389AR = $(CROSS_COMPILE)ar
390NM = $(CROSS_COMPILE)nm
391STRIP = $(CROSS_COMPILE)strip
392OBJCOPY = $(CROSS_COMPILE)objcopy
393OBJDUMP = $(CROSS_COMPILE)objdump
394AWK = awk
395GENKSYMS = scripts/genksyms/genksyms
396INSTALLKERNEL := installkernel
397DEPMOD = /sbin/depmod
398PERL = perl
399PYTHON = python
400CHECK = sparse
401
402CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
403 -Wbitwise -Wno-return-void $(CF)
404KMSG_CHECK = $(srctree)/scripts/kmsg-doc
405NOSTDINC_FLAGS =
406CFLAGS_MODULE =
407AFLAGS_MODULE =
408LDFLAGS_MODULE =
409CFLAGS_KERNEL =
410AFLAGS_KERNEL =
411LDFLAGS_vmlinux =
412
413# Prefer linux-backports-modules
414ifneq ($(KBUILD_SRC),)
415ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
416UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
417endif
418endif
419
420# Use USERINCLUDE when you must reference the UAPI directories only.
421USERINCLUDE := \
422 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
423 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
424 -I$(srctree)/include/uapi \
425 -I$(objtree)/include/generated/uapi \
426 -include $(srctree)/include/linux/kconfig.h
427
428# Use LINUXINCLUDE when you must reference the include/ directory.
429# Needed to be compatible with the O= option
430LINUXINCLUDE := \
431 $(UBUNTUINCLUDE) \
432 -I$(srctree)/arch/$(SRCARCH)/include \
433 -I$(objtree)/arch/$(SRCARCH)/include/generated \
434 $(if $(KBUILD_SRC), -I$(srctree)/include) \
435 -I$(objtree)/include \
436 $(USERINCLUDE)
437
438# UBUNTU: Include our third party driver stuff too
439LINUXINCLUDE += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
440
441KBUILD_AFLAGS := -D__ASSEMBLY__
442KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
443 -fno-strict-aliasing -fno-common -fshort-wchar \
444 -Werror-implicit-function-declaration \
445 -Wno-format-security \
446 -std=gnu89
447KBUILD_CPPFLAGS := -D__KERNEL__
448KBUILD_AFLAGS_KERNEL :=
449KBUILD_CFLAGS_KERNEL :=
450KBUILD_AFLAGS_MODULE := -DMODULE
451KBUILD_CFLAGS_MODULE := -DMODULE
452KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
453GCC_PLUGINS_CFLAGS :=
454
455export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
456export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
457export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
458export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
459
460export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
461export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
462export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
463export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
464export KBUILD_KMSG_CHECK KMSG_CHECK
465export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
466export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
467export KBUILD_ARFLAGS
468
469# When compiling out-of-tree modules, put MODVERDIR in the module
470# tree rather than in the kernel tree. The kernel tree might
471# even be read-only.
472export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
473
474# Files to ignore in find ... statements
475
476export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
477 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
478 -prune -o
479export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
480 --exclude CVS --exclude .pc --exclude .hg --exclude .git
481
482# ===========================================================================
483# Rules shared between *config targets and build targets
484
485# Basic helpers built in scripts/basic/
486PHONY += scripts_basic
487scripts_basic:
488 $(Q)$(MAKE) $(build)=scripts/basic
489 $(Q)rm -f .tmp_quiet_recordmcount
490
491# To avoid any implicit rule to kick in, define an empty command.
492scripts/basic/%: scripts_basic ;
493
494PHONY += outputmakefile
495# outputmakefile generates a Makefile in the output directory, if using a
496# separate output directory. This allows convenient use of make in the
497# output directory.
498outputmakefile:
499ifneq ($(KBUILD_SRC),)
500 $(Q)ln -fsn $(srctree) source
501 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
502 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
503endif
504
505ifeq ($(cc-name),clang)
506ifneq ($(CROSS_COMPILE),)
507CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
508GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
509endif
510ifneq ($(GCC_TOOLCHAIN),)
511CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
512endif
513KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
514KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
515KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
516KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
517endif
518
519RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
520RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
521RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
522RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
523RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
524RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
525export RETPOLINE_CFLAGS
526export RETPOLINE_VDSO_CFLAGS
527
528ifeq ($(config-targets),1)
529# ===========================================================================
530# *config targets only - make sure prerequisites are updated, and descend
531# in scripts/kconfig to make the *config target
532
533# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534# KBUILD_DEFCONFIG may point out an alternative default configuration
535# used for 'make defconfig'
536include arch/$(SRCARCH)/Makefile
537export KBUILD_DEFCONFIG KBUILD_KCONFIG
538
539config: scripts_basic outputmakefile FORCE
540 $(Q)$(MAKE) $(build)=scripts/kconfig $@
541
542%config: scripts_basic outputmakefile FORCE
543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545else
546# ===========================================================================
547# Build targets only - this includes vmlinux, arch specific targets, clean
548# targets and others. In general all targets except *config targets.
549
550# If building an external module we do not care about the all: rule
551# but instead _all depend on modules
552PHONY += all
553ifeq ($(KBUILD_EXTMOD),)
554_all: all
555else
556_all: modules
557endif
558
559# Decide whether to build built-in, modular, or both.
560# Normally, just do built-in.
561
562KBUILD_MODULES :=
563KBUILD_BUILTIN := 1
564
565# If we have only "make modules", don't compile built-in objects.
566# When we're building modules with modversions, we need to consider
567# the built-in objects during the descend as well, in order to
568# make sure the checksums are up to date before we record them.
569
570ifeq ($(MAKECMDGOALS),modules)
571 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
572endif
573
574# If we have "make <whatever> modules", compile modules
575# in addition to whatever we do anyway.
576# Just "make" or "make all" shall build modules as well
577
578ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
579 KBUILD_MODULES := 1
580endif
581
582ifeq ($(MAKECMDGOALS),)
583 KBUILD_MODULES := 1
584endif
585
586export KBUILD_MODULES KBUILD_BUILTIN
587
588ifeq ($(KBUILD_EXTMOD),)
589# Additional helpers built in scripts/
590# Carefully list dependencies so we do not try to build scripts twice
591# in parallel
592PHONY += scripts
593scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
594 asm-generic gcc-plugins
595 $(Q)$(MAKE) $(build)=$(@)
596
597# Objects we will link into vmlinux / subdirs we need to visit
598init-y := init/
599drivers-y := drivers/ sound/ firmware/ ubuntu/
600net-y := net/
601libs-y := lib/
602core-y := usr/
603virt-y := virt/
604endif # KBUILD_EXTMOD
605
606ifeq ($(dot-config),1)
607# Read in config
608-include include/config/auto.conf
609
610ifeq ($(may-sync-config),1)
611# Read in dependencies to all Kconfig* files, make sure to run
612# oldconfig if changes are detected.
613-include include/config/auto.conf.cmd
614
615# To avoid any implicit rule to kick in, define an empty command
616$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
617
618# If .config is newer than include/config/auto.conf, someone tinkered
619# with it and forgot to run make oldconfig.
620# if auto.conf.cmd is missing then we are probably in a cleaned tree so
621# we execute the config step to be sure to catch updated Kconfig files
622include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
623 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
624else
625# External modules and some install targets need include/generated/autoconf.h
626# and include/config/auto.conf but do not care if they are up-to-date.
627# Use auto.conf to trigger the test
628PHONY += include/config/auto.conf
629
630include/config/auto.conf:
631 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
632 echo >&2; \
633 echo >&2 " ERROR: Kernel configuration is invalid."; \
634 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
635 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
636 echo >&2 ; \
637 /bin/false)
638
639endif # may-sync-config
640
641else
642# Dummy target needed, because used as prerequisite
643include/config/auto.conf: ;
644endif # $(dot-config)
645
646# For the kernel to actually contain only the needed exported symbols,
647# we have to build modules as well to determine what those symbols are.
648# (this can be evaluated only once include/config/auto.conf has been included)
649ifdef CONFIG_TRIM_UNUSED_KSYMS
650 KBUILD_MODULES := 1
651endif
652
653# The all: target is the default when no target is given on the
654# command line.
655# This allow a user to issue only 'make' to build a kernel including modules
656# Defaults to vmlinux, but the arch makefile usually adds further targets
657all: vmlinux
658
659KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
660KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
661CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
662export CFLAGS_GCOV CFLAGS_KCOV
663
664# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
665# values of the respective KBUILD_* variables
666ARCH_CPPFLAGS :=
667ARCH_AFLAGS :=
668ARCH_CFLAGS :=
669include arch/$(SRCARCH)/Makefile
670
671KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
672KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
673KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
674KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
675KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
676KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
677
678ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
679KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
680KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
681else
682ifdef CONFIG_PROFILE_ALL_BRANCHES
683KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
684else
685KBUILD_CFLAGS += -O2
686endif
687endif
688
689KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
690 $(call cc-disable-warning,maybe-uninitialized,))
691
692# Tell gcc to never replace conditional load with a non-conditional one
693KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
694
695# check for 'asm goto'
696ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
697 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
698 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
699endif
700
701include scripts/Makefile.kcov
702include scripts/Makefile.gcc-plugins
703
704ifdef CONFIG_READABLE_ASM
705# Disable optimizations that make assembler listings hard to read.
706# reorder blocks reorders the control in the function
707# ipa clone creates specialized cloned functions
708# partial inlining inlines only parts of functions
709KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
710 $(call cc-option,-fno-ipa-cp-clone,) \
711 $(call cc-option,-fno-partial-inlining)
712endif
713
714ifneq ($(CONFIG_FRAME_WARN),0)
715KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
716endif
717
718# This selects the stack protector compiler flag. Testing it is delayed
719# until after .config has been reprocessed, in the prepare-compiler-check
720# target.
721ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
722 stackp-flag := -fstack-protector
723 stackp-name := REGULAR
724else
725ifdef CONFIG_CC_STACKPROTECTOR_STRONG
726 stackp-flag := -fstack-protector-strong
727 stackp-name := STRONG
728else
729 # Force off for distro compilers that enable stack protector by default.
730 stackp-flag := $(call cc-option, -fno-stack-protector)
731endif
732endif
733# Find arch-specific stack protector compiler sanity-checking script.
734ifdef CONFIG_CC_STACKPROTECTOR
735 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
736 stackp-check := $(wildcard $(stackp-path))
737endif
738KBUILD_CFLAGS += $(stackp-flag)
739
740ifeq ($(cc-name),clang)
741KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
742KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
743KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
744KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
745# Quiet clang warning: comparison of unsigned expression < 0 is always false
746KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
747# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
748# source of a reference will be _MergedGlobals and not on of the whitelisted names.
749# See modpost pattern 2
750KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
751KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
752else
753
754# These warnings generated too much noise in a regular build.
755# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
756KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
757endif
758
759KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
760ifdef CONFIG_FRAME_POINTER
761KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
762else
763# Some targets (ARM with Thumb2, for example), can't be built with frame
764# pointers. For those, we don't have FUNCTION_TRACER automatically
765# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
766# incompatible with -fomit-frame-pointer with current GCC, so we don't use
767# -fomit-frame-pointer with FUNCTION_TRACER.
768ifndef CONFIG_FUNCTION_TRACER
769KBUILD_CFLAGS += -fomit-frame-pointer
770endif
771endif
772
773KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
774
775ifdef CONFIG_DEBUG_INFO
776ifdef CONFIG_DEBUG_INFO_SPLIT
777KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
778else
779KBUILD_CFLAGS += -g
780endif
781KBUILD_AFLAGS += -Wa,-gdwarf-2
782endif
783ifdef CONFIG_DEBUG_INFO_DWARF4
784KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
785endif
786
787ifdef CONFIG_DEBUG_INFO_REDUCED
788KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
789 $(call cc-option,-fno-var-tracking)
790endif
791
792ifdef CONFIG_FUNCTION_TRACER
793ifndef CC_FLAGS_FTRACE
794CC_FLAGS_FTRACE := -pg
795endif
796export CC_FLAGS_FTRACE
797ifdef CONFIG_HAVE_FENTRY
798CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
799endif
800KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
801KBUILD_AFLAGS += $(CC_USING_FENTRY)
802ifdef CONFIG_DYNAMIC_FTRACE
803 ifdef CONFIG_HAVE_C_RECORDMCOUNT
804 BUILD_C_RECORDMCOUNT := y
805 export BUILD_C_RECORDMCOUNT
806 endif
807endif
808endif
809
810# We trigger additional mismatches with less inlining
811ifdef CONFIG_DEBUG_SECTION_MISMATCH
812KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
813endif
814
815ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
816KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
817KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
818endif
819
820# arch Makefile may override CC so keep this after arch Makefile is included
821NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
822CHECKFLAGS += $(NOSTDINC_FLAGS)
823
824# warn about C99 declaration after statement
825KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
826
827# disable pointer signed / unsigned warnings in gcc 4.0
828KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
829
830# disable invalid "can't wrap" optimizations for signed / pointers
831KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
832
833# clang sets -fmerge-all-constants by default as optimization, but this
834# is non-conforming behavior for C and in fact breaks the kernel, so we
835# need to disable it here generally.
836KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
837
838# for gcc -fno-merge-all-constants disables everything, but it is fine
839# to have actual conforming behavior enabled.
840KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
841
842# Make sure -fstack-check isn't enabled (like gentoo apparently did)
843KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
844
845# conserve stack if available
846KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
847
848# disallow errors like 'EXPORT_GPL(foo);' with missing header
849KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
850
851# require functions to have arguments in prototypes, not empty 'int foo()'
852KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
853
854# Prohibit date/time macros, which would make the build non-deterministic
855KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
856
857# enforce correct pointer usage
858KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
859
860# Require designated initializers for all marked structures
861KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
862
863# use the deterministic mode of AR if available
864KBUILD_ARFLAGS := $(call ar-option,D)
865
866include scripts/Makefile.kasan
867include scripts/Makefile.extrawarn
868include scripts/Makefile.ubsan
869
870# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
871# last assignments
872KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
873KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
874KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
875
876# Use --build-id when available.
877LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
878 $(call cc-ldoption, -Wl$(comma)--build-id,))
879KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
880LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
881
882ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
883LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
884endif
885
886ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
887LDFLAGS_vmlinux += $(call ld-option, -X,)
888endif
889
890# Default kernel image to build when no specific target is given.
891# KBUILD_IMAGE may be overruled on the command line or
892# set in the environment
893# Also any assignments in arch/$(ARCH)/Makefile take precedence over
894# this default value
895export KBUILD_IMAGE ?= vmlinux
896
897#
898# INSTALL_PATH specifies where to place the updated kernel and system map
899# images. Default is /boot, but you can set it to other values
900export INSTALL_PATH ?= /boot
901
902#
903# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
904# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
905# an argument if needed. Otherwise it defaults to the kernel install path
906#
907export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
908
909#
910# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
911# relocations required by build roots. This is not defined in the
912# makefile but the argument can be passed to make if needed.
913#
914
915MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
916export MODLIB
917
918#
919# INSTALL_MOD_STRIP, if defined, will cause modules to be
920# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
921# the default option --strip-debug will be used. Otherwise,
922# INSTALL_MOD_STRIP value will be used as the options to the strip command.
923
924ifdef INSTALL_MOD_STRIP
925ifeq ($(INSTALL_MOD_STRIP),1)
926mod_strip_cmd = $(STRIP) --strip-debug
927else
928mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
929endif # INSTALL_MOD_STRIP=1
930else
931mod_strip_cmd = true
932endif # INSTALL_MOD_STRIP
933export mod_strip_cmd
934
935# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
936# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
937# or CONFIG_MODULE_COMPRESS_XZ.
938
939mod_compress_cmd = true
940ifdef CONFIG_MODULE_COMPRESS
941 ifdef CONFIG_MODULE_COMPRESS_GZIP
942 mod_compress_cmd = gzip -n -f
943 endif # CONFIG_MODULE_COMPRESS_GZIP
944 ifdef CONFIG_MODULE_COMPRESS_XZ
945 mod_compress_cmd = xz -f
946 endif # CONFIG_MODULE_COMPRESS_XZ
947endif # CONFIG_MODULE_COMPRESS
948export mod_compress_cmd
949
950# Select initial ramdisk compression format, default is gzip(1).
951# This shall be used by the dracut(8) tool while creating an initramfs image.
952#
953INITRD_COMPRESS-y := gzip
954INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
955INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
956INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
957INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
958INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
959# do not export INITRD_COMPRESS, since we didn't actually
960# choose a sane default compression above.
961# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
962
963ifdef CONFIG_MODULE_SIG_ALL
964$(eval $(call config_filename,MODULE_SIG_KEY))
965
966mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
967else
968mod_sign_cmd = true
969endif
970export mod_sign_cmd
971
972ifdef CONFIG_STACK_VALIDATION
973 has_libelf := $(call try-run,\
974 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
975 ifeq ($(has_libelf),1)
976 objtool_target := tools/objtool FORCE
977 else
978 ifdef CONFIG_UNWINDER_ORC
979 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
980 else
981 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
982 endif
983 SKIP_STACK_VALIDATION := 1
984 export SKIP_STACK_VALIDATION
985 endif
986endif
987
988
989ifeq ($(KBUILD_EXTMOD),)
990core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
991
992vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
993 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
994 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
995
996vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
997 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
998
999init-y := $(patsubst %/, %/built-in.o, $(init-y))
1000core-y := $(patsubst %/, %/built-in.o, $(core-y))
1001drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
1002net-y := $(patsubst %/, %/built-in.o, $(net-y))
1003libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1004libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
1005virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
1006
1007# Externally visible symbols (used by link-vmlinux.sh)
1008export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1009export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1010export KBUILD_VMLINUX_LIBS := $(libs-y1)
1011export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1012export LDFLAGS_vmlinux
1013# used by scripts/package/Makefile
1014export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1015
1016vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1017
1018# Include targets which we want to execute sequentially if the rest of the
1019# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1020# evaluated more than once.
1021PHONY += vmlinux_prereq
1022vmlinux_prereq: $(vmlinux-deps) FORCE
1023ifdef CONFIG_HEADERS_CHECK
1024 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1025endif
1026ifdef CONFIG_GDB_SCRIPTS
1027 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1028endif
1029ifdef CONFIG_TRIM_UNUSED_KSYMS
1030 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1031 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1032endif
1033
1034# standalone target for easier testing
1035include/generated/autoksyms.h: FORCE
1036 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1037
1038ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1039
1040# Final link of vmlinux with optional arch pass after final link
1041cmd_link-vmlinux = \
1042 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1043 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1044
1045vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1046 +$(call if_changed,link-vmlinux)
1047
1048# Build samples along the rest of the kernel
1049ifdef CONFIG_SAMPLES
1050vmlinux-dirs += samples
1051endif
1052
1053# The actual objects are generated when descending,
1054# make sure no implicit rule kicks in
1055$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1056
1057# Handle descending into subdirectories listed in $(vmlinux-dirs)
1058# Preset locale variables to speed up the build process. Limit locale
1059# tweaks to this spot to avoid wrong language settings when running
1060# make menuconfig etc.
1061# Error messages still appears in the original language
1062
1063PHONY += $(vmlinux-dirs)
1064$(vmlinux-dirs): prepare scripts
1065 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1066
1067define filechk_kernel.release
1068 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1069endef
1070
1071# Store (new) KERNELRELEASE string in include/config/kernel.release
1072include/config/kernel.release: include/config/auto.conf FORCE
1073 $(call filechk,kernel.release)
1074
1075
1076# Things we need to do before we recursively start building the kernel
1077# or the modules are listed in "prepare".
1078# A multi level approach is used. prepareN is processed before prepareN-1.
1079# archprepare is used in arch Makefiles and when processed asm symlink,
1080# version.h and scripts_basic is processed / created.
1081
1082# Listed in dependency order
1083PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1084
1085# prepare3 is used to check if we are building in a separate output directory,
1086# and if so do:
1087# 1) Check that make has not been executed in the kernel src $(srctree)
1088prepare3: include/config/kernel.release
1089ifneq ($(KBUILD_SRC),)
1090 @$(kecho) ' Using $(srctree) as source for kernel'
1091 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1092 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1093 echo >&2 " in the '$(srctree)' directory.";\
1094 /bin/false; \
1095 fi;
1096endif
1097
1098# prepare2 creates a makefile if using a separate output directory.
1099# From this point forward, .config has been reprocessed, so any rules
1100# that need to depend on updated CONFIG_* values can be checked here.
1101prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1102
1103prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1104 include/config/auto.conf
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# Check for CONFIG flags that require compiler support. Abort the build
1128# after .config has been processed, but before the kernel build starts.
1129#
1130# For security-sensitive CONFIG options, we don't want to fallback and/or
1131# silently change which compiler flags will be used, since that leads to
1132# producing kernels with different security feature characteristics
1133# depending on the compiler used. (For example, "But I selected
1134# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1135PHONY += prepare-compiler-check
1136prepare-compiler-check: FORCE
1137# Make sure compiler supports requested stack protector flag.
1138ifdef stackp-name
1139 ifeq ($(call cc-option, $(stackp-flag)),)
1140 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1141 $(stackp-flag) not supported by compiler >&2 && exit 1
1142 endif
1143endif
1144# Make sure compiler does not have buggy stack-protector support.
1145ifdef stackp-check
1146 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1147 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1148 $(stackp-flag) available but compiler is broken >&2 && exit 1
1149 endif
1150endif
1151 @:
1152
1153# Generate some files
1154# ---------------------------------------------------------------------------
1155
1156# KERNELRELEASE can change from a few different places, meaning version.h
1157# needs to be updated, so this check is forced on all builds
1158
1159uts_len := 64
1160define filechk_utsrelease.h
1161 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1162 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1163 exit 1; \
1164 fi; \
1165 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1166endef
1167
1168define filechk_version.h
1169 (echo \#define LINUX_VERSION_CODE $(shell \
1170 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1171 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1172endef
1173
1174$(version_h): $(srctree)/Makefile FORCE
1175 $(call filechk,version.h)
1176 $(Q)rm -f $(old_version_h)
1177
1178include/generated/utsrelease.h: include/config/kernel.release FORCE
1179 $(call filechk,utsrelease.h)
1180
1181PHONY += headerdep
1182headerdep:
1183 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1184 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1185
1186# ---------------------------------------------------------------------------
1187# Kernel headers
1188
1189#Default location for installed headers
1190export INSTALL_HDR_PATH = $(objtree)/usr
1191
1192# If we do an all arch process set dst to include/arch-$(SRCARCH)
1193hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1194
1195PHONY += archheaders
1196archheaders:
1197
1198PHONY += archscripts
1199archscripts:
1200
1201PHONY += __headers
1202__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1203 $(Q)$(MAKE) $(build)=scripts build_unifdef
1204
1205PHONY += headers_install_all
1206headers_install_all:
1207 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1208
1209PHONY += headers_install
1210headers_install: __headers
1211 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1212 $(error Headers not exportable for the $(SRCARCH) architecture))
1213 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1214 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1215 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1216
1217PHONY += headers_check_all
1218headers_check_all: headers_install_all
1219 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1220
1221PHONY += headers_check
1222headers_check: headers_install
1223 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1224 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1225 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1226
1227# ---------------------------------------------------------------------------
1228# Kernel selftest
1229
1230PHONY += kselftest
1231kselftest:
1232 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1233
1234PHONY += kselftest-clean
1235kselftest-clean:
1236 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1237
1238PHONY += kselftest-merge
1239kselftest-merge:
1240 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1241 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1242 -m $(objtree)/.config \
1243 $(srctree)/tools/testing/selftests/*/config
1244 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1245
1246# ---------------------------------------------------------------------------
1247# Modules
1248
1249ifdef CONFIG_MODULES
1250
1251# By default, build modules as well
1252
1253all: modules
1254
1255# Build modules
1256#
1257# A module can be listed more than once in obj-m resulting in
1258# duplicate lines in modules.order files. Those are removed
1259# using awk while concatenating to the final file.
1260
1261PHONY += modules
1262modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1263 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1264 @$(kecho) ' Building modules, stage 2.';
1265 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1266
1267modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1268 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1269
1270%/modules.builtin: include/config/auto.conf
1271 $(Q)$(MAKE) $(modbuiltin)=$*
1272
1273
1274# Target to prepare building external modules
1275PHONY += modules_prepare
1276modules_prepare: prepare scripts
1277
1278# Target to install modules
1279PHONY += modules_install
1280modules_install: _modinst_ _modinst_post
1281
1282PHONY += _modinst_
1283_modinst_:
1284 @rm -rf $(MODLIB)/kernel
1285 @rm -f $(MODLIB)/source
1286 @mkdir -p $(MODLIB)/kernel
1287 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1288 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1289 rm -f $(MODLIB)/build ; \
1290 ln -s $(CURDIR) $(MODLIB)/build ; \
1291 fi
1292 @cp -f $(objtree)/modules.order $(MODLIB)/
1293 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1294 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1295
1296# This depmod is only for convenience to give the initial
1297# boot a modules.dep even before / is mounted read-write. However the
1298# boot script depmod is the master version.
1299PHONY += _modinst_post
1300_modinst_post: _modinst_
1301 $(call cmd,depmod)
1302
1303ifeq ($(CONFIG_MODULE_SIG), y)
1304PHONY += modules_sign
1305modules_sign:
1306 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1307endif
1308
1309else # CONFIG_MODULES
1310
1311# Modules not configured
1312# ---------------------------------------------------------------------------
1313
1314PHONY += modules modules_install
1315modules modules_install:
1316 @echo >&2
1317 @echo >&2 "The present kernel configuration has modules disabled."
1318 @echo >&2 "Type 'make config' and enable loadable module support."
1319 @echo >&2 "Then build a kernel with module support enabled."
1320 @echo >&2
1321 @exit 1
1322
1323endif # CONFIG_MODULES
1324
1325###
1326# Cleaning is done on three levels.
1327# make clean Delete most generated files
1328# Leave enough to build external modules
1329# make mrproper Delete the current configuration, and all generated files
1330# make distclean Remove editor backup files, patch leftover files and the like
1331
1332# Directories & files removed with 'make clean'
1333CLEAN_DIRS += $(MODVERDIR)
1334
1335# Directories & files removed with 'make mrproper'
1336MRPROPER_DIRS += include/config usr/include include/generated \
1337 arch/*/include/generated .tmp_objdiff
1338MRPROPER_FILES += .config .config.old .version \
1339 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1340 signing_key.pem signing_key.priv signing_key.x509 \
1341 x509.genkey extra_certificates signing_key.x509.keyid \
1342 signing_key.x509.signer vmlinux-gdb.py
1343
1344# clean - Delete most, but leave enough to build external modules
1345#
1346clean: rm-dirs := $(CLEAN_DIRS)
1347clean: rm-files := $(CLEAN_FILES)
1348clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1349
1350PHONY += $(clean-dirs) clean archclean vmlinuxclean
1351$(clean-dirs):
1352 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1353
1354vmlinuxclean:
1355 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1356 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1357
1358clean: archclean vmlinuxclean
1359
1360# mrproper - Delete all generated files, including .config
1361#
1362mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1363mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1364mrproper-dirs := $(addprefix _mrproper_,scripts)
1365
1366PHONY += $(mrproper-dirs) mrproper archmrproper
1367$(mrproper-dirs):
1368 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1369
1370mrproper: clean archmrproper $(mrproper-dirs)
1371 $(call cmd,rmdirs)
1372 $(call cmd,rmfiles)
1373
1374# distclean
1375#
1376PHONY += distclean
1377
1378distclean: mrproper
1379 @find $(srctree) $(RCS_FIND_IGNORE) \
1380 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1381 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1382 -o -name 'core' \) \
1383 -type f -print | xargs rm -f
1384
1385
1386# Packaging of the kernel to various formats
1387# ---------------------------------------------------------------------------
1388# rpm target kept for backward compatibility
1389package-dir := scripts/package
1390
1391%src-pkg: FORCE
1392 $(Q)$(MAKE) $(build)=$(package-dir) $@
1393%pkg: include/config/kernel.release FORCE
1394 $(Q)$(MAKE) $(build)=$(package-dir) $@
1395rpm: rpm-pkg
1396 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18"
1397 @echo " Please use \"rpm-pkg\" instead."
1398
1399
1400# Brief documentation of the typical targets used
1401# ---------------------------------------------------------------------------
1402
1403boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1404boards := $(sort $(notdir $(boards)))
1405board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1406board-dirs := $(sort $(notdir $(board-dirs:/=)))
1407
1408PHONY += help
1409help:
1410 @echo 'Cleaning targets:'
1411 @echo ' clean - Remove most generated files but keep the config and'
1412 @echo ' enough build support to build external modules'
1413 @echo ' mrproper - Remove all generated files + config + various backup files'
1414 @echo ' distclean - mrproper + remove editor backup and patch files'
1415 @echo ''
1416 @echo 'Configuration targets:'
1417 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1418 @echo ''
1419 @echo 'Other generic targets:'
1420 @echo ' all - Build all targets marked with [*]'
1421 @echo '* vmlinux - Build the bare kernel'
1422 @echo '* modules - Build all modules'
1423 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1424 @echo ' dir/ - Build all files in dir and below'
1425 @echo ' dir/file.[ois] - Build specified target only'
1426 @echo ' dir/file.ll - Build the LLVM assembly file'
1427 @echo ' (requires compiler support for LLVM assembly generation)'
1428 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1429 @echo ' (requires a recent binutils and recent build (System.map))'
1430 @echo ' dir/file.ko - Build module including final link'
1431 @echo ' modules_prepare - Set up for building external modules'
1432 @echo ' tags/TAGS - Generate tags file for editors'
1433 @echo ' cscope - Generate cscope index'
1434 @echo ' gtags - Generate GNU GLOBAL index'
1435 @echo ' kernelrelease - Output the release version string (use with make -s)'
1436 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1437 @echo ' image_name - Output the image name (use with make -s)'
1438 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1439 echo ' (default: $(INSTALL_HDR_PATH))'; \
1440 echo ''
1441 @echo 'Static analysers:'
1442 @echo ' checkstack - Generate a list of stack hogs'
1443 @echo ' namespacecheck - Name space analysis on compiled kernel'
1444 @echo ' versioncheck - Sanity check on version.h usage'
1445 @echo ' includecheck - Check for duplicate included header files'
1446 @echo ' export_report - List the usages of all exported symbols'
1447 @echo ' headers_check - Sanity check on exported headers'
1448 @echo ' headerdep - Detect inclusion cycles in headers'
1449 @echo ' coccicheck - Check with Coccinelle'
1450 @echo ''
1451 @echo 'Kernel selftest:'
1452 @echo ' kselftest - Build and run kernel selftest (run as root)'
1453 @echo ' Build, install, and boot kernel before'
1454 @echo ' running kselftest on it'
1455 @echo ' kselftest-clean - Remove all generated kselftest files'
1456 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1457 @echo ' .config.'
1458 @echo ''
1459 @echo 'Userspace tools targets:'
1460 @echo ' use "make tools/help"'
1461 @echo ' or "cd tools; make help"'
1462 @echo ''
1463 @echo 'Kernel packaging:'
1464 @$(MAKE) $(build)=$(package-dir) help
1465 @echo ''
1466 @echo 'Documentation targets:'
1467 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1468 @echo ''
1469 @echo 'Architecture specific targets ($(SRCARCH)):'
1470 @$(if $(archhelp),$(archhelp),\
1471 echo ' No architecture specific help defined for $(SRCARCH)')
1472 @echo ''
1473 @$(if $(boards), \
1474 $(foreach b, $(boards), \
1475 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1476 echo '')
1477 @$(if $(board-dirs), \
1478 $(foreach b, $(board-dirs), \
1479 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1480 printf " %-16s - Show all of the above\\n" help-boards; \
1481 echo '')
1482
1483 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1484 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1485 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1486 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1487 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1488 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1489 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1490 @echo ' 1: warnings which may be relevant and do not occur too often'
1491 @echo ' 2: warnings which occur quite often but may still be relevant'
1492 @echo ' 3: more obscure warnings, can most likely be ignored'
1493 @echo ' Multiple levels can be combined with W=12 or W=123'
1494 @echo ''
1495 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1496 @echo 'For further info see the ./README file'
1497
1498
1499help-board-dirs := $(addprefix help-,$(board-dirs))
1500
1501help-boards: $(help-board-dirs)
1502
1503boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1504
1505$(help-board-dirs): help-%:
1506 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1507 @$(if $(boards-per-dir), \
1508 $(foreach b, $(boards-per-dir), \
1509 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1510 echo '')
1511
1512
1513# Documentation targets
1514# ---------------------------------------------------------------------------
1515DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1516 linkcheckdocs dochelp refcheckdocs
1517PHONY += $(DOC_TARGETS)
1518$(DOC_TARGETS): scripts_basic FORCE
1519 $(Q)$(MAKE) $(build)=Documentation $@
1520
1521else # KBUILD_EXTMOD
1522
1523###
1524# External module support.
1525# When building external modules the kernel used as basis is considered
1526# read-only, and no consistency checks are made and the make
1527# system is not used on the basis kernel. If updates are required
1528# in the basis kernel ordinary make commands (without M=...) must
1529# be used.
1530#
1531# The following are the only valid targets when building external
1532# modules.
1533# make M=dir clean Delete all automatically generated files
1534# make M=dir modules Make all modules in specified dir
1535# make M=dir Same as 'make M=dir modules'
1536# make M=dir modules_install
1537# Install the modules built in the module directory
1538# Assumes install directory is already created
1539
1540# We are always building modules
1541KBUILD_MODULES := 1
1542PHONY += crmodverdir
1543crmodverdir:
1544 $(cmd_crmodverdir)
1545
1546PHONY += $(objtree)/Module.symvers
1547$(objtree)/Module.symvers:
1548 @test -e $(objtree)/Module.symvers || ( \
1549 echo; \
1550 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1551 echo " is missing; modules will have no dependencies and modversions."; \
1552 echo )
1553
1554module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1555PHONY += $(module-dirs) modules
1556$(module-dirs): crmodverdir $(objtree)/Module.symvers
1557 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1558
1559modules: $(module-dirs)
1560 @$(kecho) ' Building modules, stage 2.';
1561 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1562
1563PHONY += modules_install
1564modules_install: _emodinst_ _emodinst_post
1565
1566install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1567PHONY += _emodinst_
1568_emodinst_:
1569 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1570 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1571
1572PHONY += _emodinst_post
1573_emodinst_post: _emodinst_
1574 $(call cmd,depmod)
1575
1576clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1577
1578PHONY += $(clean-dirs) clean
1579$(clean-dirs):
1580 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1581
1582clean: rm-dirs := $(MODVERDIR)
1583clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1584
1585PHONY += help
1586help:
1587 @echo ' Building external modules.'
1588 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1589 @echo ''
1590 @echo ' modules - default target, build the module(s)'
1591 @echo ' modules_install - install the module'
1592 @echo ' clean - remove generated files in module directory only'
1593 @echo ''
1594
1595# Dummies...
1596PHONY += prepare scripts
1597prepare: ;
1598scripts: ;
1599endif # KBUILD_EXTMOD
1600
1601clean: $(clean-dirs)
1602 $(call cmd,rmdirs)
1603 $(call cmd,rmfiles)
1604 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1605 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1606 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1607 -o -name '*.dwo' -o -name '*.lst' \
1608 -o -name '*.su' \
1609 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1610 -o -name '*.symtypes' -o -name 'modules.order' \
1611 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1612 -o -name .cache.mk \
1613 -o -name '*.c.[012]*.*' \
1614 -o -name '*.ll' \
1615 -o -name '*.gcno' \) -type f -print | xargs rm -f
1616
1617# Generate tags for editors
1618# ---------------------------------------------------------------------------
1619quiet_cmd_tags = GEN $@
1620 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1621
1622tags TAGS cscope gtags: FORCE
1623 $(call cmd,tags)
1624
1625# Scripts to check various things for consistency
1626# ---------------------------------------------------------------------------
1627
1628PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1629
1630includecheck:
1631 find $(srctree)/* $(RCS_FIND_IGNORE) \
1632 -name '*.[hcS]' -type f -print | sort \
1633 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1634
1635versioncheck:
1636 find $(srctree)/* $(RCS_FIND_IGNORE) \
1637 -name '*.[hcS]' -type f -print | sort \
1638 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1639
1640coccicheck:
1641 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1642
1643namespacecheck:
1644 $(PERL) $(srctree)/scripts/namespace.pl
1645
1646export_report:
1647 $(PERL) $(srctree)/scripts/export_report.pl
1648
1649endif #ifeq ($(config-targets),1)
1650endif #ifeq ($(mixed-targets),1)
1651
1652PHONY += checkstack kernelrelease kernelversion image_name
1653
1654# UML needs a little special treatment here. It wants to use the host
1655# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1656# else wants $(ARCH), including people doing cross-builds, which means
1657# that $(SUBARCH) doesn't work here.
1658ifeq ($(ARCH), um)
1659CHECKSTACK_ARCH := $(SUBARCH)
1660else
1661CHECKSTACK_ARCH := $(ARCH)
1662endif
1663checkstack:
1664 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1665 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1666
1667kernelrelease:
1668 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1669
1670kernelversion:
1671 @echo $(KERNELVERSION)
1672
1673image_name:
1674 @echo $(KBUILD_IMAGE)
1675
1676# Clear a bunch of variables before executing the submake
1677tools/: FORCE
1678 $(Q)mkdir -p $(objtree)/tools
1679 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1680
1681tools/%: FORCE
1682 $(Q)mkdir -p $(objtree)/tools
1683 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1684
1685# Single targets
1686# ---------------------------------------------------------------------------
1687# Single targets are compatible with:
1688# - build with mixed source and output
1689# - build with separate output dir 'make O=...'
1690# - external modules
1691#
1692# target-dir => where to store outputfile
1693# build-dir => directory in kernel source tree to use
1694
1695ifeq ($(KBUILD_EXTMOD),)
1696 build-dir = $(patsubst %/,%,$(dir $@))
1697 target-dir = $(dir $@)
1698else
1699 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1700 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1701 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1702endif
1703
1704%.s: %.c prepare scripts FORCE
1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706%.i: %.c prepare scripts FORCE
1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1708%.o: %.c prepare scripts FORCE
1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710%.lst: %.c prepare scripts FORCE
1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1712%.s: %.S prepare scripts FORCE
1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1714%.o: %.S prepare scripts FORCE
1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1716%.symtypes: %.c prepare scripts FORCE
1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1718%.ll: %.c prepare scripts FORCE
1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1720
1721# Modules
1722/: prepare scripts FORCE
1723 $(cmd_crmodverdir)
1724 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1725 $(build)=$(build-dir)
1726# Make sure the latest headers are built for Documentation
1727Documentation/ samples/: headers_install
1728%/: prepare scripts FORCE
1729 $(cmd_crmodverdir)
1730 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1731 $(build)=$(build-dir)
1732%.ko: prepare scripts FORCE
1733 $(cmd_crmodverdir)
1734 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1735 $(build)=$(build-dir) $(@:.ko=.o)
1736 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1737
1738# FIXME Should go into a make.lib or something
1739# ===========================================================================
1740
1741quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1742 cmd_rmdirs = rm -rf $(rm-dirs)
1743
1744quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1745 cmd_rmfiles = rm -f $(rm-files)
1746
1747# Run depmod only if we have System.map and depmod is executable
1748quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1749 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1750 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1751
1752# Create temporary dir for module support files
1753# clean it up only when building all modules
1754cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1755 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1756
1757# read all saved command lines
1758
1759cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1760
1761ifneq ($(cmd_files),)
1762 $(cmd_files): ; # Do not try to update included dependency files
1763 include $(cmd_files)
1764endif
1765
1766endif # skip-makefile
1767
1768PHONY += FORCE
1769FORCE:
1770
1771# Declare the contents of the .PHONY variable as phony. We keep that
1772# information in a variable so we can use it in if_changed and friends.
1773.PHONY: $(PHONY)