xref: /linux/Makefile (revision 6f7e6393d1ce636bb7ec77a7fe7b77458fddf701) 
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 6
3PATCHLEVEL = 19
4SUBLEVEL = 0
5EXTRAVERSION =
6NAME = Baby Opossum Posse
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
14ifeq ($(filter output-sync,$(.FEATURES)),)
15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
16endif
17
18$(if $(filter __%, $(MAKECMDGOALS)), \
19	$(error targets prefixed with '__' are only for internal use))
20
21# That's our default target when none is given on the command line
22PHONY := __all
23__all:
24
25# We are using a recursive build, so we need to do a little thinking
26# to get the ordering right.
27#
28# Most importantly: sub-Makefiles should only ever modify files in
29# their own directory. If in some directory we have a dependency on
30# a file in another dir (which doesn't happen often, but it's often
31# unavoidable when linking the built-in.a targets which finally
32# turn into vmlinux), we will call a sub make in that other dir, and
33# after that we are sure that everything which is in that other dir
34# is now up to date.
35#
36# The only cases where we need to modify files which have global
37# effects are thus separated out and done before the recursive
38# descending is started. They are now explicitly listed as the
39# prepare rule.
40
41this-makefile := $(lastword $(MAKEFILE_LIST))
42abs_srctree := $(realpath $(dir $(this-makefile)))
43abs_output := $(CURDIR)
44
45ifneq ($(sub_make_done),1)
46
47# Do not use make's built-in rules and variables
48# (this increases performance and avoids hard-to-debug behaviour)
49MAKEFLAGS += -rR
50
51# Avoid funny character set dependencies
52unexport LC_ALL
53LC_COLLATE=C
54LC_NUMERIC=C
55export LC_COLLATE LC_NUMERIC
56
57# Avoid interference with shell env settings
58unexport GREP_OPTIONS
59
60# Beautify output
61# ---------------------------------------------------------------------------
62#
63# Most of build commands in Kbuild start with "cmd_". You can optionally define
64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65# that command is printed by default.
66#
67# e.g.)
68#    quiet_cmd_depmod = DEPMOD  $(MODLIB)
69#          cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
70#
71# A simple variant is to prefix commands with $(Q) - that's useful
72# for commands that shall be hidden in non-verbose mode.
73#
74#    $(Q)$(MAKE) $(build)=scripts/basic
75#
76# If KBUILD_VERBOSE contains 1, the whole command is echoed.
77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
78#
79# To put more focus on warnings, be less verbose as default
80# Use 'make V=1' to see the full commands
81
82ifeq ("$(origin V)", "command line")
83  KBUILD_VERBOSE = $(V)
84endif
85
86quiet = quiet_
87Q = @
88
89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
90  quiet =
91  Q =
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
97quiet=silent_
98override KBUILD_VERBOSE :=
99endif
100
101export quiet Q KBUILD_VERBOSE
102
103# Call a source code checker (by default, "sparse") as part of the
104# C compilation.
105#
106# Use 'make C=1' to enable checking of only re-compiled files.
107# Use 'make C=2' to enable checking of *all* source files, regardless
108# of whether they are re-compiled or not.
109#
110# See the file "Documentation/dev-tools/sparse.rst" for more details,
111# including where to get the "sparse" utility.
112
113ifeq ("$(origin C)", "command line")
114  KBUILD_CHECKSRC = $(C)
115endif
116ifndef KBUILD_CHECKSRC
117  KBUILD_CHECKSRC = 0
118endif
119
120export KBUILD_CHECKSRC
121
122# Enable "clippy" (a linter) as part of the Rust compilation.
123#
124# Use 'make CLIPPY=1' to enable it.
125ifeq ("$(origin CLIPPY)", "command line")
126  KBUILD_CLIPPY := $(CLIPPY)
127endif
128
129export KBUILD_CLIPPY
130
131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132# directory of external module to build. Setting M= takes precedence.
133ifeq ("$(origin M)", "command line")
134  KBUILD_EXTMOD := $(M)
135endif
136
137ifeq ("$(origin MO)", "command line")
138  KBUILD_EXTMOD_OUTPUT := $(MO)
139endif
140
141$(if $(word 2, $(KBUILD_EXTMOD)), \
142	$(error building multiple external modules is not supported))
143
144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
145	$(error module directory path cannot contain '$x')))
146
147# Remove trailing slashes
148ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
150endif
151
152export KBUILD_EXTMOD
153
154ifeq ("$(origin W)", "command line")
155  KBUILD_EXTRA_WARN := $(W)
156endif
157
158export KBUILD_EXTRA_WARN
159
160# Kbuild will save output files in the current working directory.
161# This does not need to match to the root of the kernel source tree.
162#
163# For example, you can do this:
164#
165#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
166#
167# If you want to save output files in a different location, there are
168# two syntaxes to specify it.
169#
170# 1) O=
171# Use "make O=dir/to/store/output/files/"
172#
173# 2) Set KBUILD_OUTPUT
174# Set the environment variable KBUILD_OUTPUT to point to the output directory.
175# export KBUILD_OUTPUT=dir/to/store/output/files/; make
176#
177# The O= assignment takes precedence over the KBUILD_OUTPUT environment
178# variable.
179
180ifeq ("$(origin O)", "command line")
181  KBUILD_OUTPUT := $(O)
182endif
183
184ifdef KBUILD_EXTMOD
185    ifdef KBUILD_OUTPUT
186        objtree := $(realpath $(KBUILD_OUTPUT))
187        $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist))
188    else
189        objtree := $(abs_srctree)
190    endif
191    # If Make is invoked from the kernel directory (either kernel
192    # source directory or kernel build directory), external modules
193    # are built in $(KBUILD_EXTMOD) for backward compatibility,
194    # otherwise, built in the current directory.
195    output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD)))
196    # KBUILD_EXTMOD might be a relative path. Remember its absolute path before
197    # Make changes the working directory.
198    srcroot := $(realpath $(KBUILD_EXTMOD))
199    $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist))
200else
201    objtree := .
202    output := $(KBUILD_OUTPUT)
203endif
204
205export objtree srcroot
206
207# Do we want to change the working directory?
208ifneq ($(output),)
209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
210$(shell mkdir -p "$(output)")
211# $(realpath ...) resolves symlinks
212abs_output := $(realpath $(output))
213$(if $(abs_output),,$(error failed to create output directory "$(output)"))
214endif
215
216ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
217$(error source directory cannot contain spaces or colons)
218endif
219
220export sub_make_done := 1
221
222endif # sub_make_done
223
224ifeq ($(abs_output),$(CURDIR))
225# Suppress "Entering directory ..." if we are at the final work directory.
226no-print-directory := --no-print-directory
227else
228# Recursion to show "Entering directory ..."
229need-sub-make := 1
230endif
231
232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
233# If --no-print-directory is unset, recurse once again to set it.
234# You may end up recursing into __sub-make twice. This is needed due to the
235# behavior change in GNU Make 4.4.1.
236need-sub-make := 1
237endif
238
239ifeq ($(need-sub-make),1)
240
241PHONY += $(MAKECMDGOALS) __sub-make
242
243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
244	@:
245
246# Invoke a second make in the output directory, passing relevant variables
247__sub-make:
248	$(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \
249	-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
250
251else # need-sub-make
252
253# We process the rest of the Makefile if this is the final invocation of make
254
255ifndef KBUILD_EXTMOD
256srcroot := $(abs_srctree)
257endif
258
259ifeq ($(srcroot),$(CURDIR))
260building_out_of_srctree :=
261else
262export building_out_of_srctree := 1
263endif
264
265ifdef KBUILD_ABS_SRCTREE
266    # Do nothing. Use the absolute path.
267else ifeq ($(srcroot),$(CURDIR))
268    # Building in the source.
269    srcroot := .
270else ifeq ($(srcroot)/,$(dir $(CURDIR)))
271    # Building in a subdirectory of the source.
272    srcroot := ..
273endif
274
275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot))
276
277ifdef building_out_of_srctree
278export VPATH := $(srcroot)
279else
280VPATH :=
281endif
282
283# To make sure we do not include .config for any of the *config targets
284# catch them early, and hand them over to scripts/kconfig/Makefile
285# It is allowed to specify more targets when calling make, including
286# mixing *config targets and build targets.
287# For example 'make oldconfig all'.
288# Detect when mixed targets is specified, and make a second invocation
289# of make so .config is not included in this case either (for *config).
290
291version_h := include/generated/uapi/linux/version.h
292
293clean-targets := %clean mrproper cleandocs
294no-dot-config-targets := $(clean-targets) \
295			 cscope gtags TAGS tags help% %docs check% coccicheck \
296			 $(version_h) headers headers_% archheaders archscripts \
297			 %asm-generic kernelversion %src-pkg dt_binding_check \
298			 outputmakefile rustavailable rustfmt rustfmtcheck
299no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
300			  image_name
301single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/
302
303config-build	:=
304mixed-build	:=
305need-config	:= 1
306may-sync-config	:= 1
307single-build	:=
308
309ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
310    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
311        need-config :=
312    endif
313endif
314
315ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
316    ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
317        may-sync-config :=
318    endif
319endif
320
321need-compiler := $(may-sync-config)
322
323ifneq ($(KBUILD_EXTMOD),)
324    may-sync-config :=
325endif
326
327ifeq ($(KBUILD_EXTMOD),)
328    ifneq ($(filter %config,$(MAKECMDGOALS)),)
329        config-build := 1
330        ifneq ($(words $(MAKECMDGOALS)),1)
331            mixed-build := 1
332        endif
333    endif
334endif
335
336# We cannot build single targets and the others at the same time
337ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
338    single-build := 1
339    ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
340        mixed-build := 1
341    endif
342endif
343
344# For "make -j clean all", "make -j mrproper defconfig all", etc.
345ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
346    ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
347        mixed-build := 1
348    endif
349endif
350
351# install and modules_install need also be processed one by one
352ifneq ($(filter install,$(MAKECMDGOALS)),)
353    ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
354        mixed-build := 1
355    endif
356endif
357
358ifdef mixed-build
359# ===========================================================================
360# We're called with mixed targets (*config and build targets).
361# Handle them one by one.
362
363PHONY += $(MAKECMDGOALS) __build_one_by_one
364
365$(MAKECMDGOALS): __build_one_by_one
366	@:
367
368__build_one_by_one:
369	$(Q)set -e; \
370	for i in $(MAKECMDGOALS); do \
371		$(MAKE) -f $(srctree)/Makefile $$i; \
372	done
373
374else # !mixed-build
375
376include $(srctree)/scripts/Kbuild.include
377
378# Read KERNELRELEASE from include/config/kernel.release (if it exists)
379KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release)
380KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
381export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
382
383include $(srctree)/scripts/subarch.include
384
385# Cross compiling and selecting different set of gcc/bin-utils
386# ---------------------------------------------------------------------------
387#
388# When performing cross compilation for other architectures ARCH shall be set
389# to the target architecture. (See arch/* for the possibilities).
390# ARCH can be set during invocation of make:
391# make ARCH=arm64
392# Another way is to have ARCH set in the environment.
393# The default ARCH is the host where make is executed.
394
395# CROSS_COMPILE specify the prefix used for all executables used
396# during compilation. Only gcc and related bin-utils executables
397# are prefixed with $(CROSS_COMPILE).
398# CROSS_COMPILE can be set on the command line
399# make CROSS_COMPILE=aarch64-linux-gnu-
400# Alternatively CROSS_COMPILE can be set in the environment.
401# Default value for CROSS_COMPILE is not to prefix executables
402# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
403ARCH		?= $(SUBARCH)
404
405# Architecture as present in compile.h
406UTS_MACHINE 	:= $(ARCH)
407SRCARCH 	:= $(ARCH)
408
409# Additional ARCH settings for x86
410ifeq ($(ARCH),i386)
411        SRCARCH := x86
412endif
413ifeq ($(ARCH),x86_64)
414        SRCARCH := x86
415endif
416
417# Additional ARCH settings for sparc
418ifeq ($(ARCH),sparc32)
419       SRCARCH := sparc
420endif
421ifeq ($(ARCH),sparc64)
422       SRCARCH := sparc
423endif
424
425# Additional ARCH settings for parisc
426ifeq ($(ARCH),parisc64)
427       SRCARCH := parisc
428endif
429
430export cross_compiling :=
431ifneq ($(SRCARCH),$(SUBARCH))
432cross_compiling := 1
433endif
434
435KCONFIG_CONFIG	?= .config
436export KCONFIG_CONFIG
437
438# SHELL used by kbuild
439CONFIG_SHELL := sh
440
441HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
442HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
443HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
444
445ifneq ($(LLVM),)
446ifneq ($(filter %/,$(LLVM)),)
447LLVM_PREFIX := $(LLVM)
448else ifneq ($(filter -%,$(LLVM)),)
449LLVM_SUFFIX := $(LLVM)
450endif
451
452HOSTCC	= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
453HOSTCXX	= $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
454else
455HOSTCC	= gcc
456HOSTCXX	= g++
457endif
458HOSTRUSTC = rustc
459HOSTPKG_CONFIG	= pkg-config
460
461# the KERNELDOC macro needs to be exported, as scripts/Makefile.build
462# has a logic to call it
463KERNELDOC       = $(srctree)/tools/docs/kernel-doc
464export KERNELDOC
465
466KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
467			 -O2 -fomit-frame-pointer -std=gnu11
468KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
469KBUILD_USERLDFLAGS := $(USERLDFLAGS)
470
471# These flags apply to all Rust code in the tree, including the kernel and
472# host programs.
473export rust_common_flags := --edition=2021 \
474			    -Zbinary_dep_depinfo=y \
475			    -Astable_features \
476			    -Dnon_ascii_idents \
477			    -Dunsafe_op_in_unsafe_fn \
478			    -Wmissing_docs \
479			    -Wrust_2018_idioms \
480			    -Wunreachable_pub \
481			    -Wclippy::all \
482			    -Wclippy::as_ptr_cast_mut \
483			    -Wclippy::as_underscore \
484			    -Wclippy::cast_lossless \
485			    -Wclippy::ignored_unit_patterns \
486			    -Wclippy::mut_mut \
487			    -Wclippy::needless_bitwise_bool \
488			    -Aclippy::needless_lifetimes \
489			    -Wclippy::no_mangle_with_rust_abi \
490			    -Wclippy::ptr_as_ptr \
491			    -Wclippy::ptr_cast_constness \
492			    -Wclippy::ref_as_ptr \
493			    -Wclippy::undocumented_unsafe_blocks \
494			    -Wclippy::unnecessary_safety_comment \
495			    -Wclippy::unnecessary_safety_doc \
496			    -Wrustdoc::missing_crate_level_docs \
497			    -Wrustdoc::unescaped_backticks
498
499KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
500		       $(HOSTCFLAGS) -I $(srctree)/scripts/include
501KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
502		       -I $(srctree)/scripts/include
503KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
504			-Zallow-features= $(HOSTRUSTFLAGS)
505KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
506KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
507KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS))
508
509# Make variables (CC, etc...)
510CPP		= $(CC) -E
511ifneq ($(LLVM),)
512CC		= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
513LD		= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
514AR		= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
515NM		= $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
516OBJCOPY		= $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
517OBJDUMP		= $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
518READELF		= $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
519STRIP		= $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
520else
521CC		= $(CROSS_COMPILE)gcc
522LD		= $(CROSS_COMPILE)ld
523AR		= $(CROSS_COMPILE)ar
524NM		= $(CROSS_COMPILE)nm
525OBJCOPY		= $(CROSS_COMPILE)objcopy
526OBJDUMP		= $(CROSS_COMPILE)objdump
527READELF		= $(CROSS_COMPILE)readelf
528STRIP		= $(CROSS_COMPILE)strip
529endif
530RUSTC		= rustc
531RUSTDOC		= rustdoc
532RUSTFMT		= rustfmt
533CLIPPY_DRIVER	= clippy-driver
534BINDGEN		= bindgen
535PAHOLE		= pahole
536RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
537LEX		= flex
538YACC		= bison
539AWK		= awk
540INSTALLKERNEL  := installkernel
541PERL		= perl
542PYTHON3		= python3
543CHECK		= sparse
544BASH		= bash
545KGZIP		= gzip
546KBZIP2		= bzip2
547KLZOP		= lzop
548LZMA		= lzma
549LZ4		= lz4
550XZ		= xz
551ZSTD		= zstd
552TAR		= tar
553
554CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
555		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
556NOSTDINC_FLAGS :=
557CFLAGS_MODULE   =
558RUSTFLAGS_MODULE =
559AFLAGS_MODULE   =
560LDFLAGS_MODULE  =
561CFLAGS_KERNEL	=
562RUSTFLAGS_KERNEL =
563AFLAGS_KERNEL	=
564LDFLAGS_vmlinux =
565
566# Use USERINCLUDE when you must reference the UAPI directories only.
567USERINCLUDE    := \
568		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
569		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
570		-I$(srctree)/include/uapi \
571		-I$(objtree)/include/generated/uapi \
572                -include $(srctree)/include/linux/compiler-version.h \
573                -include $(srctree)/include/linux/kconfig.h
574
575# Use LINUXINCLUDE when you must reference the include/ directory.
576# Needed to be compatible with the O= option
577LINUXINCLUDE    := \
578		-I$(srctree)/arch/$(SRCARCH)/include \
579		-I$(objtree)/arch/$(SRCARCH)/include/generated \
580		-I$(srctree)/include \
581		-I$(objtree)/include \
582		$(USERINCLUDE)
583
584KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
585
586KBUILD_CFLAGS :=
587KBUILD_CFLAGS += -std=gnu11
588KBUILD_CFLAGS += -fshort-wchar
589KBUILD_CFLAGS += -funsigned-char
590KBUILD_CFLAGS += -fno-common
591KBUILD_CFLAGS += -fno-PIE
592KBUILD_CFLAGS += -fno-strict-aliasing
593
594KBUILD_CPPFLAGS := -D__KERNEL__
595KBUILD_RUSTFLAGS := $(rust_common_flags) \
596		    -Cpanic=abort -Cembed-bitcode=n -Clto=n \
597		    -Cforce-unwind-tables=n -Ccodegen-units=1 \
598		    -Csymbol-mangling-version=v0 \
599		    -Crelocation-model=static \
600		    -Zfunction-sections=n \
601		    -Wclippy::float_arithmetic
602
603KBUILD_AFLAGS_KERNEL :=
604KBUILD_CFLAGS_KERNEL :=
605KBUILD_RUSTFLAGS_KERNEL :=
606KBUILD_AFLAGS_MODULE  := -DMODULE
607KBUILD_CFLAGS_MODULE  := -DMODULE
608KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
609KBUILD_LDFLAGS_MODULE :=
610KBUILD_LDFLAGS :=
611CLANG_FLAGS :=
612
613ifeq ($(KBUILD_CLIPPY),1)
614	RUSTC_OR_CLIPPY_QUIET := CLIPPY
615	RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
616else
617	RUSTC_OR_CLIPPY_QUIET := RUSTC
618	RUSTC_OR_CLIPPY = $(RUSTC)
619endif
620
621# Allows the usage of unstable features in stable compilers.
622export RUSTC_BOOTSTRAP := 1
623
624# Allows finding `.clippy.toml` in out-of-srctree builds.
625export CLIPPY_CONF_DIR := $(srctree)
626
627export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
628export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
629export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
630export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
631export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
632export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR
633export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE
634export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
635
636export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
637export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
638export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
639export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
640export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
641export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
642
643# Files to ignore in find ... statements
644
645export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
646			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
647			  -prune -o
648
649# ===========================================================================
650# Rules shared between *config targets and build targets
651
652# Basic helpers built in scripts/basic/
653PHONY += scripts_basic
654scripts_basic:
655	$(Q)$(MAKE) $(build)=scripts/basic
656
657PHONY += outputmakefile
658ifdef building_out_of_srctree
659# Before starting out-of-tree build, make sure the source tree is clean.
660# outputmakefile generates a Makefile in the output directory, if using a
661# separate output directory. This allows convenient use of make in the
662# output directory.
663# At the same time when output Makefile generated, generate .gitignore to
664# ignore whole output directory
665
666ifdef KBUILD_EXTMOD
667print_env_for_makefile = \
668	echo "export KBUILD_OUTPUT = $(objtree)"; \
669	echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
670	echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
671else
672print_env_for_makefile = \
673	echo "export KBUILD_OUTPUT = $(CURDIR)"
674endif
675
676quiet_cmd_makefile = GEN     Makefile
677      cmd_makefile = { \
678	echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
679	$(print_env_for_makefile); \
680	echo "include $(abs_srctree)/Makefile"; \
681	} > Makefile
682
683outputmakefile:
684ifeq ($(KBUILD_EXTMOD),)
685	@if [ -f $(srctree)/.config -o \
686		 -d $(srctree)/include/config -o \
687		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
688		echo >&2 "***"; \
689		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
690		echo >&2 "*** in $(abs_srctree)";\
691		echo >&2 "***"; \
692		false; \
693	fi
694else
695	@if [ -f $(srcroot)/modules.order ]; then \
696		echo >&2 "***"; \
697		echo >&2 "*** The external module source tree is not clean."; \
698		echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \
699		echo >&2 "***"; \
700		false; \
701	fi
702endif
703	$(Q)ln -fsn $(srcroot) source
704	$(call cmd,makefile)
705	$(Q)test -e .gitignore || \
706	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
707endif
708
709# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
710# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
711# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from
712# Kconfig (so they need export), and from include/config/auto.conf.cmd to
713# detect the version changes between builds.
714CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
715RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
716PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE))
717
718ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
719include $(srctree)/scripts/Makefile.clang
720endif
721
722# Include this also for config targets because some architectures need
723# cc-cross-prefix to determine CROSS_COMPILE.
724ifdef need-compiler
725include $(srctree)/scripts/Makefile.compiler
726endif
727
728ifdef config-build
729# ===========================================================================
730# *config targets only - make sure prerequisites are updated, and descend
731# in scripts/kconfig to make the *config target
732
733# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
734# KBUILD_DEFCONFIG may point out an alternative default configuration
735# used for 'make defconfig'
736include $(srctree)/arch/$(SRCARCH)/Makefile
737export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION
738
739config: outputmakefile scripts_basic FORCE
740	$(Q)$(MAKE) $(build)=scripts/kconfig $@
741
742%config: outputmakefile scripts_basic FORCE
743	$(Q)$(MAKE) $(build)=scripts/kconfig $@
744
745else #!config-build
746# ===========================================================================
747# Build targets only - this includes vmlinux, arch-specific targets, clean
748# targets and others. In general all targets except *config targets.
749
750# If building an external module we do not care about the all: rule
751# but instead __all depend on modules
752PHONY += all
753ifeq ($(KBUILD_EXTMOD),)
754__all: all
755else
756__all: modules
757endif
758
759targets :=
760
761# Decide whether to build built-in, modular, or both.
762# Normally, just do built-in.
763
764KBUILD_MODULES :=
765KBUILD_BUILTIN := y
766
767# If we have only "make modules", don't compile built-in objects.
768ifeq ($(MAKECMDGOALS),modules)
769  KBUILD_BUILTIN :=
770endif
771
772# If we have "make <whatever> modules", compile modules
773# in addition to whatever we do anyway.
774# Just "make" or "make all" shall build modules as well
775
776ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
777  KBUILD_MODULES := y
778endif
779
780ifeq ($(MAKECMDGOALS),)
781  KBUILD_MODULES := y
782endif
783
784export KBUILD_MODULES KBUILD_BUILTIN
785
786ifdef need-config
787include $(objtree)/include/config/auto.conf
788endif
789
790ifeq ($(KBUILD_EXTMOD),)
791# Objects we will link into vmlinux / subdirs we need to visit
792core-y		:=
793drivers-y	:=
794libs-y		:= lib/
795endif # KBUILD_EXTMOD
796
797# The all: target is the default when no target is given on the
798# command line.
799# This allow a user to issue only 'make' to build a kernel including modules
800# Defaults to vmlinux, but the arch makefile usually adds further targets
801all: vmlinux
802
803CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage
804ifdef CONFIG_CC_IS_GCC
805CFLAGS_GCOV	+= -fno-tree-loop-im
806endif
807export CFLAGS_GCOV
808
809# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
810ifdef CONFIG_FUNCTION_TRACER
811  CC_FLAGS_FTRACE := -pg
812endif
813
814ifdef CONFIG_TRACEPOINTS
815# To check for unused tracepoints (tracepoints that are defined but never
816# called), run with:
817#
818# make UT=1
819#
820# Each unused tracepoints can take up to 5KB of memory in the running kernel.
821# It is best to remove any that are not used.
822#
823# This command line option will be removed when all current unused
824# tracepoints are removed.
825
826ifeq ("$(origin UT)", "command line")
827  WARN_ON_UNUSED_TRACEPOINTS := $(UT)
828endif
829endif # CONFIG_TRACEPOINTS
830
831export WARN_ON_UNUSED_TRACEPOINTS
832
833include $(srctree)/arch/$(SRCARCH)/Makefile
834
835ifdef need-config
836ifdef may-sync-config
837# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
838# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
839# because some architectures define CROSS_COMPILE there.
840include include/config/auto.conf.cmd
841
842$(KCONFIG_CONFIG):
843	@echo >&2 '***'
844	@echo >&2 '*** Configuration file "$@" not found!'
845	@echo >&2 '***'
846	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
847	@echo >&2 '*** "make menuconfig" or "make xconfig").'
848	@echo >&2 '***'
849	@/bin/false
850
851# The actual configuration files used during the build are stored in
852# include/generated/ and include/config/. Update them if .config is newer than
853# include/config/auto.conf (which mirrors .config).
854#
855# This exploits the 'multi-target pattern rule' trick.
856# The syncconfig should be executed only once to make all the targets.
857# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
858#
859# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
860# so you cannot notice that Kconfig is waiting for the user input.
861%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
862	$(Q)$(kecho) "  SYNC    $@"
863	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
864else # !may-sync-config
865# External modules and some install targets need include/generated/autoconf.h
866# and include/config/auto.conf but do not care if they are up-to-date.
867# Use auto.conf to show the error message
868
869checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
870missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
871
872ifdef missing-configs
873PHONY += $(objtree)/include/config/auto.conf
874
875$(objtree)/include/config/auto.conf:
876	@echo   >&2 '***'
877	@echo   >&2 '***  ERROR: Kernel configuration is invalid. The following files are missing:'
878	@printf >&2 '***    - %s\n' $(missing-configs)
879	@echo   >&2 '***  Run "make oldconfig && make prepare" on kernel source to fix it.'
880	@echo   >&2 '***'
881	@/bin/false
882endif
883
884endif # may-sync-config
885endif # need-config
886
887KBUILD_CFLAGS	+= -fno-delete-null-pointer-checks
888
889ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
890KBUILD_CFLAGS += -O2
891KBUILD_RUSTFLAGS += -Copt-level=2
892else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
893KBUILD_CFLAGS += -Os
894KBUILD_RUSTFLAGS += -Copt-level=s
895endif
896
897# Always set `debug-assertions` and `overflow-checks` because their default
898# depends on `opt-level` and `debug-assertions`, respectively.
899KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
900KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
901
902# Tell gcc to never replace conditional load with a non-conditional one
903ifdef CONFIG_CC_IS_GCC
904# gcc-10 renamed --param=allow-store-data-races=0 to
905# -fno-allow-store-data-races.
906KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
907KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
908endif
909
910ifdef CONFIG_READABLE_ASM
911# Disable optimizations that make assembler listings hard to read.
912# reorder blocks reorders the control in the function
913# ipa clone creates specialized cloned functions
914# partial inlining inlines only parts of functions
915KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
916endif
917
918stackp-flags-y                                    := -fno-stack-protector
919stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
920stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
921
922KBUILD_CFLAGS += $(stackp-flags-y)
923
924ifdef CONFIG_FRAME_POINTER
925KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
926KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
927else
928# Some targets (ARM with Thumb2, for example), can't be built with frame
929# pointers.  For those, we don't have FUNCTION_TRACER automatically
930# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
931# incompatible with -fomit-frame-pointer with current GCC, so we don't use
932# -fomit-frame-pointer with FUNCTION_TRACER.
933# In the Rust target specification, "frame-pointer" is set explicitly
934# to "may-omit".
935ifndef CONFIG_FUNCTION_TRACER
936KBUILD_CFLAGS	+= -fomit-frame-pointer
937endif
938endif
939
940# Initialize all stack variables with a 0xAA pattern.
941ifdef CONFIG_INIT_STACK_ALL_PATTERN
942KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
943endif
944
945# Initialize all stack variables with a zero value.
946ifdef CONFIG_INIT_STACK_ALL_ZERO
947KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
948ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
949# https://github.com/llvm/llvm-project/issues/44842
950CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
951export CC_AUTO_VAR_INIT_ZERO_ENABLER
952KBUILD_CFLAGS	+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
953endif
954endif
955
956ifdef CONFIG_CC_IS_CLANG
957ifdef CONFIG_CC_HAS_COUNTED_BY_PTR
958KBUILD_CFLAGS	+= -fexperimental-late-parse-attributes
959endif
960endif
961
962# Explicitly clear padding bits during variable initialization
963KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
964
965# While VLAs have been removed, GCC produces unreachable stack probes
966# for the randomize_kstack_offset feature. Disable it for all compilers.
967KBUILD_CFLAGS	+= $(call cc-option, -fno-stack-clash-protection)
968
969# Get details on warnings generated due to GCC value tracking.
970KBUILD_CFLAGS	+= $(call cc-option, -fdiagnostics-show-context=2)
971
972# Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
973ifdef CONFIG_ZERO_CALL_USED_REGS
974KBUILD_CFLAGS	+= -fzero-call-used-regs=used-gpr
975endif
976
977ifdef CONFIG_FUNCTION_TRACER
978ifdef CONFIG_FTRACE_MCOUNT_USE_CC
979  CC_FLAGS_FTRACE	+= -mrecord-mcount
980  ifdef CONFIG_HAVE_NOP_MCOUNT
981    ifeq ($(call cc-option-yn, -mnop-mcount),y)
982      CC_FLAGS_FTRACE	+= -mnop-mcount
983      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
984    endif
985  endif
986endif
987ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
988  ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
989    CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
990  endif
991endif
992ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
993  ifdef CONFIG_HAVE_C_RECORDMCOUNT
994    BUILD_C_RECORDMCOUNT := y
995    export BUILD_C_RECORDMCOUNT
996  endif
997endif
998ifdef CONFIG_HAVE_FENTRY
999  # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
1000  ifeq ($(call cc-option-yn, -mfentry),y)
1001    CC_FLAGS_FTRACE	+= -mfentry
1002    CC_FLAGS_USING	+= -DCC_USING_FENTRY
1003  endif
1004endif
1005export CC_FLAGS_FTRACE
1006KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
1007KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
1008endif
1009
1010# We trigger additional mismatches with less inlining
1011ifdef CONFIG_DEBUG_SECTION_MISMATCH
1012KBUILD_CFLAGS += -fno-inline-functions-called-once
1013endif
1014
1015# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
1016ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
1017KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
1018KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
1019LDFLAGS_vmlinux += --gc-sections
1020endif
1021
1022ifdef CONFIG_SHADOW_CALL_STACK
1023ifndef CONFIG_DYNAMIC_SCS
1024CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
1025KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
1026KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
1027endif
1028export CC_FLAGS_SCS
1029endif
1030
1031ifdef CONFIG_LTO_CLANG
1032ifdef CONFIG_LTO_CLANG_THIN
1033CC_FLAGS_LTO	:= -flto=thin -fsplit-lto-unit
1034else
1035CC_FLAGS_LTO	:= -flto
1036endif
1037CC_FLAGS_LTO	+= -fvisibility=hidden
1038
1039# Limit inlining across translation units to reduce binary size
1040KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1041endif
1042
1043ifdef CONFIG_LTO
1044KBUILD_CFLAGS	+= -fno-lto $(CC_FLAGS_LTO)
1045KBUILD_AFLAGS	+= -fno-lto
1046export CC_FLAGS_LTO
1047endif
1048
1049ifdef CONFIG_CFI
1050CC_FLAGS_CFI	:= -fsanitize=kcfi
1051ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
1052	CC_FLAGS_CFI	+= -fsanitize-cfi-icall-experimental-normalize-integers
1053endif
1054ifdef CONFIG_FINEIBT_BHI
1055	CC_FLAGS_CFI	+= -fsanitize-kcfi-arity
1056endif
1057ifdef CONFIG_RUST
1058	# Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
1059	# CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
1060	RUSTC_FLAGS_CFI   := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
1061	KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
1062	export RUSTC_FLAGS_CFI
1063endif
1064KBUILD_CFLAGS	+= $(CC_FLAGS_CFI)
1065export CC_FLAGS_CFI
1066endif
1067
1068# Architectures can define flags to add/remove for floating-point support
1069CC_FLAGS_FPU	+= -D_LINUX_FPU_COMPILATION_UNIT
1070export CC_FLAGS_FPU
1071export CC_FLAGS_NO_FPU
1072
1073ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1074# Set the minimal function alignment. Use the newer GCC option
1075# -fmin-function-alignment if it is available, or fall back to -falign-funtions.
1076# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
1077ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
1078KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
1079else
1080KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1081endif
1082endif
1083
1084# arch Makefile may override CC so keep this after arch Makefile is included
1085NOSTDINC_FLAGS += -nostdinc
1086
1087# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1088# the kernel uses only C99 flexible arrays for dynamically sized trailing
1089# arrays. Enforce this for everything that may examine structure sizes and
1090# perform bounds checking.
1091KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1092
1093# Allow including a tagged struct or union anonymously in another struct/union.
1094KBUILD_CFLAGS += -fms-extensions
1095
1096# disable invalid "can't wrap" optimizations for signed / pointers
1097KBUILD_CFLAGS	+= -fno-strict-overflow
1098
1099# Make sure -fstack-check isn't enabled (like gentoo apparently did)
1100KBUILD_CFLAGS  += -fno-stack-check
1101
1102# conserve stack if available
1103ifdef CONFIG_CC_IS_GCC
1104KBUILD_CFLAGS   += -fconserve-stack
1105endif
1106
1107# Ensure compilers do not transform certain loops into calls to wcslen()
1108KBUILD_CFLAGS += -fno-builtin-wcslen
1109
1110# change __FILE__ to the relative path to the source directory
1111ifdef building_out_of_srctree
1112KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
1113endif
1114
1115# include additional Makefiles when needed
1116include-y			:= scripts/Makefile.warn
1117include-$(CONFIG_DEBUG_INFO)	+= scripts/Makefile.debug
1118include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1119include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
1120include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
1121include-$(CONFIG_KMSAN)		+= scripts/Makefile.kmsan
1122include-$(CONFIG_UBSAN)		+= scripts/Makefile.ubsan
1123include-$(CONFIG_KCOV)		+= scripts/Makefile.kcov
1124include-$(CONFIG_RANDSTRUCT)	+= scripts/Makefile.randstruct
1125include-$(CONFIG_KSTACK_ERASE)	+= scripts/Makefile.kstack_erase
1126include-$(CONFIG_AUTOFDO_CLANG)	+= scripts/Makefile.autofdo
1127include-$(CONFIG_PROPELLER_CLANG)	+= scripts/Makefile.propeller
1128include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis
1129include-$(CONFIG_GCC_PLUGINS)	+= scripts/Makefile.gcc-plugins
1130
1131include $(addprefix $(srctree)/, $(include-y))
1132
1133# scripts/Makefile.gcc-plugins is intentionally included last.
1134# Do not add $(call cc-option,...) below this line. When you build the kernel
1135# from the clean source tree, the GCC plugins do not exist at this point.
1136
1137# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1138KBUILD_CPPFLAGS += $(KCPPFLAGS)
1139KBUILD_AFLAGS   += $(KAFLAGS)
1140KBUILD_CFLAGS   += $(KCFLAGS)
1141KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1142
1143KBUILD_LDFLAGS_MODULE += --build-id=sha1
1144LDFLAGS_vmlinux += --build-id=sha1
1145
1146KBUILD_LDFLAGS	+= -z noexecstack
1147ifeq ($(CONFIG_LD_IS_BFD),y)
1148KBUILD_LDFLAGS	+= $(call ld-option,--no-warn-rwx-segments)
1149endif
1150
1151ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1152LDFLAGS_vmlinux	+= -X
1153endif
1154
1155ifeq ($(CONFIG_RELR),y)
1156# ld.lld before 15 did not support -z pack-relative-relocs.
1157LDFLAGS_vmlinux	+= $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1158endif
1159
1160# We never want expected sections to be placed heuristically by the
1161# linker. All sections should be explicitly named in the linker script.
1162ifdef CONFIG_LD_ORPHAN_WARN
1163LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1164endif
1165
1166ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),)
1167LDFLAGS_vmlinux	+= --emit-relocs --discard-none
1168endif
1169
1170# Align the architecture of userspace programs with the kernel
1171USERFLAGS_FROM_KERNEL := --target=%
1172
1173ifdef CONFIG_ARCH_USERFLAGS
1174KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS)
1175KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS)
1176else
1177# If not overridden also inherit the bit size
1178USERFLAGS_FROM_KERNEL += -m32 -m64
1179endif
1180
1181KBUILD_USERCFLAGS  += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1182KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1183
1184# userspace programs are linked via the compiler, use the correct linker
1185ifdef CONFIG_CC_IS_CLANG
1186KBUILD_USERLDFLAGS += --ld-path=$(LD)
1187endif
1188
1189# make the checker run with the right architecture
1190CHECKFLAGS += --arch=$(ARCH)
1191
1192# insure the checker run with the right endianness
1193CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1194
1195# the checker needs the correct machine size
1196CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1197
1198# Validate the checker is available and functional
1199ifneq ($(KBUILD_CHECKSRC), 0)
1200  ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1)
1201    $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date)
1202    KBUILD_CHECKSRC = 0
1203  endif
1204endif
1205
1206# Default kernel image to build when no specific target is given.
1207# KBUILD_IMAGE may be overruled on the command line or
1208# set in the environment
1209# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1210# this default value
1211export KBUILD_IMAGE ?= vmlinux
1212
1213#
1214# INSTALL_PATH specifies where to place the updated kernel and system map
1215# images. Default is /boot, but you can set it to other values
1216export	INSTALL_PATH ?= /boot
1217
1218#
1219# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1220# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1221# an argument if needed. Otherwise it defaults to the kernel install path
1222#
1223export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1224
1225#
1226# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1227# relocations required by build roots.  This is not defined in the
1228# makefile but the argument can be passed to make if needed.
1229#
1230
1231MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1232export MODLIB
1233
1234PHONY += prepare0
1235
1236ifeq ($(KBUILD_EXTMOD),)
1237
1238build-dir	:= .
1239clean-dirs	:= $(sort . Documentation \
1240		     $(patsubst %/,%,$(filter %/, $(core-) \
1241			$(drivers-) $(libs-))))
1242
1243export ARCH_CORE	:= $(core-y)
1244export ARCH_LIB		:= $(filter %/, $(libs-y))
1245export ARCH_DRIVERS	:= $(drivers-y) $(drivers-m)
1246# Externally visible symbols (used by link-vmlinux.sh)
1247
1248KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1249KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1250
1251export KBUILD_VMLINUX_LIBS
1252export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1253
1254ifdef CONFIG_TRIM_UNUSED_KSYMS
1255# For the kernel to actually contain only the needed exported symbols,
1256# we have to build modules as well to determine what those symbols are.
1257KBUILD_MODULES := y
1258endif
1259
1260# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1261quiet_cmd_ar_vmlinux.a = AR      $@
1262      cmd_ar_vmlinux.a = \
1263	rm -f $@; \
1264	$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1265	$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1266
1267targets += vmlinux.a
1268vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1269	$(call if_changed,ar_vmlinux.a)
1270
1271PHONY += vmlinux_o
1272vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1273	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1274
1275vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1276	@:
1277
1278PHONY += vmlinux
1279# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1280# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1281# unrelated; the decompressors just happen to have the same base name,
1282# arch/*/boot/compressed/vmlinux.
1283# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1284#
1285# _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1286#   https://savannah.gnu.org/bugs/?61463
1287# For Make > 4.4, the following simple code will work:
1288#  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1289vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1290vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1291vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1292	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1293
1294# The actual objects are generated when descending,
1295# make sure no implicit rule kicks in
1296$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1297
1298ifeq ($(origin KERNELRELEASE),file)
1299filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1300else
1301filechk_kernel.release = echo $(KERNELRELEASE)
1302endif
1303
1304# Store (new) KERNELRELEASE string in include/config/kernel.release
1305include/config/kernel.release: FORCE
1306	$(call filechk,kernel.release)
1307
1308# Additional helpers built in scripts/
1309# Carefully list dependencies so we do not try to build scripts twice
1310# in parallel
1311PHONY += scripts
1312scripts: scripts_basic scripts_dtc
1313	$(Q)$(MAKE) $(build)=$(@)
1314
1315# Things we need to do before we recursively start building the kernel
1316# or the modules are listed in "prepare".
1317# A multi level approach is used. prepareN is processed before prepareN-1.
1318# archprepare is used in arch Makefiles and when processed asm symlink,
1319# version.h and scripts_basic is processed / created.
1320
1321PHONY += prepare archprepare
1322
1323archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1324	asm-generic $(version_h) include/generated/utsrelease.h \
1325	include/generated/compile.h include/generated/autoconf.h \
1326	include/generated/rustc_cfg remove-stale-files
1327
1328prepare0: archprepare
1329	$(Q)$(MAKE) $(build)=scripts/mod
1330	$(Q)$(MAKE) $(build)=. prepare
1331
1332# All the preparing..
1333prepare: prepare0
1334ifdef CONFIG_RUST
1335	+$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1336	$(Q)$(MAKE) $(build)=rust
1337endif
1338
1339PHONY += remove-stale-files
1340remove-stale-files:
1341	$(Q)$(srctree)/scripts/remove-stale-files
1342
1343# Support for using generic headers in asm-generic
1344asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1345
1346PHONY += asm-generic uapi-asm-generic
1347asm-generic: uapi-asm-generic
1348	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1349	generic=include/asm-generic
1350uapi-asm-generic:
1351	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1352	generic=include/uapi/asm-generic
1353
1354# Generate some files
1355# ---------------------------------------------------------------------------
1356
1357# KERNELRELEASE can change from a few different places, meaning version.h
1358# needs to be updated, so this check is forced on all builds
1359
1360uts_len := 64
1361define filechk_utsrelease.h
1362	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1363	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1364	  exit 1;                                                         \
1365	fi;                                                               \
1366	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1367endef
1368
1369define filechk_version.h
1370	if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1371		echo \#define LINUX_VERSION_CODE $(shell                 \
1372		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1373	else                                                             \
1374		echo \#define LINUX_VERSION_CODE $(shell                 \
1375		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1376	fi;                                                              \
1377	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1378	((c) > 255 ? 255 : (c)))';                                       \
1379	echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1380	echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1381	echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1382endef
1383
1384$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1385$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1386$(version_h): FORCE
1387	$(call filechk,version.h)
1388
1389include/generated/utsrelease.h: include/config/kernel.release FORCE
1390	$(call filechk,utsrelease.h)
1391
1392filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1393	"$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1394
1395include/generated/compile.h: FORCE
1396	$(call filechk,compile.h)
1397
1398PHONY += headerdep
1399headerdep:
1400	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1401	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1402
1403# ---------------------------------------------------------------------------
1404# Kernel headers
1405
1406#Default location for installed headers
1407export INSTALL_HDR_PATH = $(objtree)/usr
1408
1409quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1410      cmd_headers_install = \
1411	mkdir -p $(INSTALL_HDR_PATH); \
1412	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1413	usr/include $(INSTALL_HDR_PATH)
1414
1415PHONY += headers_install
1416headers_install: headers
1417	$(call cmd,headers_install)
1418
1419PHONY += archheaders archscripts
1420
1421hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1422
1423PHONY += headers
1424headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders
1425ifdef HEADER_ARCH
1426	$(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers
1427else
1428	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1429	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1430endif
1431
1432ifdef CONFIG_HEADERS_INSTALL
1433prepare: headers
1434endif
1435
1436PHONY += scripts_unifdef
1437scripts_unifdef: scripts_basic
1438	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1439
1440PHONY += scripts_gen_packed_field_checks
1441scripts_gen_packed_field_checks: scripts_basic
1442	$(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks
1443
1444# ---------------------------------------------------------------------------
1445# Install
1446
1447# Many distributions have the custom install script, /sbin/installkernel.
1448# If DKMS is installed, 'make install' will eventually recurse back
1449# to this Makefile to build and install external modules.
1450# Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1451
1452quiet_cmd_install = INSTALL $(INSTALL_PATH)
1453      cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1454
1455# ---------------------------------------------------------------------------
1456# vDSO install
1457
1458PHONY += vdso_install
1459vdso_install: export INSTALL_FILES = $(vdso-install-y)
1460vdso_install:
1461	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1462
1463# ---------------------------------------------------------------------------
1464# Tools
1465
1466ifdef CONFIG_OBJTOOL
1467prepare: tools/objtool
1468endif
1469
1470ifdef CONFIG_BPF
1471ifdef CONFIG_DEBUG_INFO_BTF
1472prepare: tools/bpf/resolve_btfids
1473endif
1474endif
1475
1476# The tools build system is not a part of Kbuild and tends to introduce
1477# its own unique issues. If you need to integrate a new tool into Kbuild,
1478# please consider locating that tool outside the tools/ tree and using the
1479# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1480# here. See Documentation/kbuild/makefiles.rst for details.
1481
1482PHONY += resolve_btfids_clean
1483
1484resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1485
1486# tools/bpf/resolve_btfids directory might not exist
1487# in output directory, skip its clean in that case
1488resolve_btfids_clean:
1489ifneq ($(wildcard $(resolve_btfids_O)),)
1490	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1491endif
1492
1493tools/: FORCE
1494	$(Q)mkdir -p $(objtree)/tools
1495	$(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1496
1497tools/%: FORCE
1498	$(Q)mkdir -p $(objtree)/tools
1499	$(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1500
1501# ---------------------------------------------------------------------------
1502# Kernel selftest
1503
1504PHONY += kselftest
1505kselftest: headers
1506	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1507
1508kselftest-%: headers FORCE
1509	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1510
1511PHONY += kselftest-merge
1512kselftest-merge:
1513	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1514	$(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1515		xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1516	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1517
1518# ---------------------------------------------------------------------------
1519# Devicetree files
1520
1521ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1522dtstree := arch/$(SRCARCH)/boot/dts
1523endif
1524
1525ifneq ($(dtstree),)
1526
1527%.dtb: dtbs_prepare
1528	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1529
1530%.dtbo: dtbs_prepare
1531	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1532
1533PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1534dtbs: dtbs_prepare
1535	$(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1536
1537# include/config/kernel.release is actually needed when installing DTBs because
1538# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1539# dtbs_install depend on it as dtbs_install may run as root.
1540dtbs_prepare: include/config/kernel.release scripts_dtc
1541
1542ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1543export CHECK_DTBS=y
1544endif
1545
1546ifneq ($(CHECK_DTBS),)
1547dtbs_prepare: dt_binding_schemas
1548endif
1549
1550dtbs_check: dtbs
1551
1552dtbs_install:
1553	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1554
1555ifdef CONFIG_OF_EARLY_FLATTREE
1556all: dtbs
1557endif
1558
1559ifdef CONFIG_GENERIC_BUILTIN_DTB
1560vmlinux: dtbs
1561endif
1562
1563endif
1564
1565PHONY += scripts_dtc
1566scripts_dtc: scripts_basic
1567	$(Q)$(MAKE) $(build)=scripts/dtc
1568
1569ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1570export CHECK_DTBS=y
1571endif
1572
1573PHONY += dt_binding_check dt_binding_schemas
1574dt_binding_check: dt_binding_schemas scripts_dtc
1575	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1576
1577dt_binding_schemas:
1578	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1579
1580PHONY += dt_compatible_check
1581dt_compatible_check: dt_binding_schemas
1582	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1583
1584# ---------------------------------------------------------------------------
1585# Modules
1586
1587ifdef CONFIG_MODULES
1588
1589# By default, build modules as well
1590
1591all: modules
1592
1593# When we're building modules with modversions, we need to consider
1594# the built-in objects during the descend as well, in order to
1595# make sure the checksums are up to date before we record them.
1596ifdef CONFIG_MODVERSIONS
1597  KBUILD_BUILTIN := y
1598endif
1599
1600# Build modules
1601#
1602
1603# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1604# is an exception.
1605ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1606KBUILD_BUILTIN := y
1607modules: vmlinux
1608endif
1609
1610modules: modules_prepare
1611
1612# Target to prepare building external modules
1613modules_prepare: prepare
1614	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
1615
1616endif # CONFIG_MODULES
1617
1618###
1619# Cleaning is done on three levels.
1620# make clean     Delete most generated files
1621#                Leave enough to build external modules
1622# make mrproper  Delete the current configuration, and all generated files
1623# make distclean Remove editor backup files, patch leftover files and the like
1624
1625# Directories & files removed with 'make clean'
1626CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1627	       modules.builtin modules.builtin.modinfo modules.nsdeps \
1628	       modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \
1629	       compile_commands.json rust/test \
1630	       rust-project.json .vmlinux.objs .vmlinux.export.c \
1631               .builtin-dtbs-list .builtin-dtb.S
1632
1633# Directories & files removed with 'make mrproper'
1634MRPROPER_FILES += include/config include/generated          \
1635		  arch/$(SRCARCH)/include/generated .objdiff \
1636		  debian snap tar-install PKGBUILD pacman \
1637		  .config .config.old .version \
1638		  Module.symvers \
1639		  certs/signing_key.pem \
1640		  certs/x509.genkey \
1641		  vmlinux-gdb.py \
1642		  rpmbuild \
1643		  rust/libmacros.so rust/libmacros.dylib \
1644		  rust/libpin_init_internal.so rust/libpin_init_internal.dylib
1645
1646# clean - Delete most, but leave enough to build external modules
1647#
1648clean: private rm-files := $(CLEAN_FILES)
1649
1650PHONY += archclean vmlinuxclean
1651
1652vmlinuxclean:
1653	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1654	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1655
1656clean: archclean vmlinuxclean resolve_btfids_clean
1657
1658# mrproper - Delete all generated files, including .config
1659#
1660mrproper: private rm-files := $(MRPROPER_FILES)
1661mrproper-dirs      := $(addprefix _mrproper_,scripts)
1662
1663PHONY += $(mrproper-dirs) mrproper
1664$(mrproper-dirs):
1665	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1666
1667mrproper: clean $(mrproper-dirs)
1668	$(call cmd,rmfiles)
1669	@find . $(RCS_FIND_IGNORE) \
1670		\( -name '*.rmeta' \) \
1671		-type f -print | xargs rm -f
1672
1673# distclean
1674#
1675PHONY += distclean
1676
1677distclean: mrproper
1678	@find . $(RCS_FIND_IGNORE) \
1679		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1680		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1681		-o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1682		-o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1683		-type f -print | xargs rm -f
1684
1685
1686# Packaging of the kernel to various formats
1687# ---------------------------------------------------------------------------
1688
1689%src-pkg: FORCE
1690	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1691%pkg: include/config/kernel.release FORCE
1692	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1693
1694# Brief documentation of the typical targets used
1695# ---------------------------------------------------------------------------
1696
1697boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1698boards := $(sort $(notdir $(boards)))
1699board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1700board-dirs := $(sort $(notdir $(board-dirs:/=)))
1701
1702PHONY += help
1703help:
1704	@echo  'Cleaning targets:'
1705	@echo  '  clean		  - Remove most generated files but keep the config and'
1706	@echo  '                    enough build support to build external modules'
1707	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1708	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1709	@echo  ''
1710	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1711	@echo  ''
1712	@echo  'Other generic targets:'
1713	@echo  '  all		  - Build all targets marked with [*]'
1714	@echo  '* vmlinux	  - Build the bare kernel'
1715	@echo  '* modules	  - Build all modules'
1716	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1717	@echo  '  vdso_install    - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1718	@echo  '  dir/            - Build all files in dir and below'
1719	@echo  '  dir/file.[ois]  - Build specified target only'
1720	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1721	@echo  '                    (requires compiler support for LLVM assembly generation)'
1722	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1723	@echo  '                    (requires a recent binutils and recent build (System.map))'
1724	@echo  '  dir/file.ko     - Build module including final link'
1725	@echo  '  modules_prepare - Set up for building external modules'
1726	@echo  '  tags/TAGS	  - Generate tags file for editors'
1727	@echo  '  cscope	  - Generate cscope index'
1728	@echo  '  gtags           - Generate GNU GLOBAL index'
1729	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1730	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1731	@echo  '  image_name	  - Output the image name (use with make -s)'
1732	@echo  '  headers	  - Build ready-to-install UAPI headers in usr/include'
1733	@echo  '  headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \
1734	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1735	 echo  ''
1736	@echo  'Static analysers:'
1737	@echo  '  checkstack      - Generate a list of stack hogs and consider all functions'
1738	@echo  '                    with a stack size larger than MINSTACKSIZE (default: 100)'
1739	@echo  '  versioncheck    - Sanity check on version.h usage'
1740	@echo  '  includecheck    - Check for duplicate included header files'
1741	@echo  '  headerdep       - Detect inclusion cycles in headers'
1742	@echo  '  coccicheck      - Check with Coccinelle'
1743	@echo  '  clang-analyzer  - Check with clang static analyzer'
1744	@echo  '  clang-tidy      - Check with clang-tidy'
1745	@echo  ''
1746	@echo  'Tools:'
1747	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1748	@echo  ''
1749	@echo  'Kernel selftest:'
1750	@echo  '  kselftest         - Build and run kernel selftest'
1751	@echo  '                      Build, install, and boot kernel before'
1752	@echo  '                      running kselftest on it'
1753	@echo  '                      Run as root for full coverage'
1754	@echo  '  kselftest-all     - Build kernel selftest'
1755	@echo  '  kselftest-install - Build and install kernel selftest'
1756	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1757	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1758	@echo  '		      kselftest to existing .config.'
1759	@echo  ''
1760	@echo  'Rust targets:'
1761	@echo  '  rustavailable   - Checks whether the Rust toolchain is'
1762	@echo  '		    available and, if not, explains why.'
1763	@echo  '  rustfmt	  - Reformat all the Rust code in the kernel'
1764	@echo  '  rustfmtcheck	  - Checks if all the Rust code in the kernel'
1765	@echo  '		    is formatted, printing a diff otherwise.'
1766	@echo  '  rustdoc	  - Generate Rust documentation'
1767	@echo  '		    (requires kernel .config)'
1768	@echo  '  rusttest        - Runs the Rust tests'
1769	@echo  '                    (requires kernel .config; downloads external repos)'
1770	@echo  '  rust-analyzer	  - Generate rust-project.json rust-analyzer support file'
1771	@echo  '		    (requires kernel .config)'
1772	@echo  '  dir/file.[os]   - Build specified target only'
1773	@echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1774	@echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1775	@echo  '                    The output is not intended to be compilable.'
1776	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1777	@echo  ''
1778	@$(if $(dtstree), \
1779		echo 'Devicetree:'; \
1780		echo '* dtbs               - Build device tree blobs for enabled boards'; \
1781		echo '  dtbs_install       - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1782		echo '  dt_binding_check   - Validate device tree binding documents and examples'; \
1783		echo '  dt_binding_schemas - Build processed device tree binding schemas'; \
1784		echo '  dtbs_check         - Validate device tree source files';\
1785		echo '')
1786
1787	@echo 'Userspace tools targets:'
1788	@echo '  use "make tools/help"'
1789	@echo '  or  "cd tools; make help"'
1790	@echo  ''
1791	@echo  'Kernel packaging:'
1792	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1793	@echo  ''
1794	@echo  'Documentation targets:'
1795	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1796	@echo  ''
1797	@echo  'Architecture-specific targets ($(SRCARCH)):'
1798	@$(or $(archhelp),\
1799		echo '  No architecture-specific help defined for $(SRCARCH)')
1800	@echo  ''
1801	@$(if $(boards), \
1802		$(foreach b, $(boards), \
1803		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1804		echo '')
1805	@$(if $(board-dirs), \
1806		$(foreach b, $(board-dirs), \
1807		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1808		printf "  %-16s - Show all of the above\\n" help-boards; \
1809		echo '')
1810
1811	@echo  '  make V=n   [targets] 1: verbose build'
1812	@echo  '                       2: give reason for rebuild of target'
1813	@echo  '                       V=1 and V=2 can be combined with V=12'
1814	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1815	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1816	@echo  '                       (sparse by default)'
1817	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1818	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1819	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3,c,e where'
1820	@echo  '		1: warnings which may be relevant and do not occur too often'
1821	@echo  '		2: warnings which occur quite often but may still be relevant'
1822	@echo  '		3: more obscure warnings, can most likely be ignored'
1823	@echo  '		c: extra checks in the configuration stage (Kconfig)'
1824	@echo  '		e: warnings are being treated as errors'
1825	@echo  '		Multiple levels can be combined with W=12 or W=123'
1826	@echo  '  make UT=1   [targets] Warn if a tracepoint is defined but not used.'
1827	@echo  '          [ This will be removed when all current unused tracepoints are eliminated. ]'
1828	@$(if $(dtstree), \
1829		echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1830		echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1831		)
1832	@echo  ''
1833	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1834	@echo  'For further info see the ./README file'
1835
1836
1837help-board-dirs := $(addprefix help-,$(board-dirs))
1838
1839help-boards: $(help-board-dirs)
1840
1841boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1842
1843$(help-board-dirs): help-%:
1844	@echo  'Architecture-specific targets ($(SRCARCH) $*):'
1845	@$(if $(boards-per-dir), \
1846		$(foreach b, $(boards-per-dir), \
1847		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1848		echo '')
1849
1850
1851# Documentation targets
1852# ---------------------------------------------------------------------------
1853DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1854	       linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \
1855	       htmldocs-redirects
1856
1857PHONY += $(DOC_TARGETS)
1858$(DOC_TARGETS):
1859	$(Q)$(MAKE) $(build)=Documentation $@
1860
1861
1862# Rust targets
1863# ---------------------------------------------------------------------------
1864
1865# "Is Rust available?" target
1866PHONY += rustavailable
1867rustavailable:
1868	+$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1869
1870# Documentation target
1871#
1872# Using the singular to avoid running afoul of `no-dot-config-targets`.
1873PHONY += rustdoc
1874rustdoc: prepare
1875	$(Q)$(MAKE) $(build)=rust $@
1876
1877# Testing target
1878PHONY += rusttest
1879rusttest: prepare
1880	$(Q)$(MAKE) $(build)=rust $@
1881
1882# Formatting targets
1883#
1884# Generated files as well as vendored crates are skipped.
1885PHONY += rustfmt rustfmtcheck
1886
1887rustfmt:
1888	$(Q)find $(srctree) $(RCS_FIND_IGNORE) \
1889		\( \
1890			-path $(srctree)/rust/proc-macro2 \
1891			-o -path $(srctree)/rust/quote \
1892			-o -path $(srctree)/rust/syn \
1893		\) -prune -o \
1894		-type f -a -name '*.rs' -a ! -name '*generated*' -print \
1895		| xargs $(RUSTFMT) $(rustfmt_flags)
1896
1897rustfmtcheck: rustfmt_flags = --check
1898rustfmtcheck: rustfmt
1899
1900# Misc
1901# ---------------------------------------------------------------------------
1902
1903PHONY += misc-check
1904misc-check:
1905	$(Q)$(srctree)/scripts/misc-check
1906
1907all: misc-check
1908
1909PHONY += scripts_gdb
1910scripts_gdb: prepare0
1911	$(Q)$(MAKE) $(build)=scripts/gdb
1912	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1913
1914ifdef CONFIG_GDB_SCRIPTS
1915all: scripts_gdb
1916endif
1917
1918else # KBUILD_EXTMOD
1919
1920filechk_kernel.release = echo $(KERNELRELEASE)
1921
1922###
1923# External module support.
1924# When building external modules the kernel used as basis is considered
1925# read-only, and no consistency checks are made and the make
1926# system is not used on the basis kernel. If updates are required
1927# in the basis kernel ordinary make commands (without M=...) must be used.
1928
1929# We are always building only modules.
1930KBUILD_BUILTIN :=
1931KBUILD_MODULES := y
1932
1933build-dir := .
1934
1935clean-dirs := .
1936clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json
1937
1938PHONY += prepare
1939# now expand this into a simple variable to reduce the cost of shell evaluations
1940prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1941prepare: PAHOLE_VERSION := $(PAHOLE_VERSION)
1942prepare:
1943	@if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1944		echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1945		echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1946		echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1947	fi
1948	@if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \
1949		echo >&2 "warning: pahole version differs from the one used to build the kernel"; \
1950		echo >&2 "  The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \
1951		echo >&2 "  You are using:             $(PAHOLE_VERSION)"; \
1952	fi
1953
1954PHONY += help
1955help:
1956	@echo  '  Building external modules.'
1957	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1958	@echo  ''
1959	@echo  '  modules         - default target, build the module(s)'
1960	@echo  '  modules_install - install the module'
1961	@echo  '  clean           - remove generated files in module directory only'
1962	@echo  '  rust-analyzer	  - generate rust-project.json rust-analyzer support file'
1963	@echo  ''
1964
1965ifndef CONFIG_MODULES
1966modules modules_install: __external_modules_error
1967__external_modules_error:
1968	@echo >&2 '***'
1969	@echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1970	@echo >&2 '*** You cannot build or install external modules.'
1971	@echo >&2 '***'
1972	@false
1973endif
1974
1975endif # KBUILD_EXTMOD
1976
1977# ---------------------------------------------------------------------------
1978# Modules
1979
1980PHONY += modules modules_install modules_sign modules_prepare
1981
1982modules_install:
1983	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1984	sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1985
1986ifeq ($(CONFIG_MODULE_SIG),y)
1987# modules_sign is a subset of modules_install.
1988# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1989modules_sign: modules_install
1990	@:
1991else
1992modules_sign:
1993	@echo >&2 '***'
1994	@echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1995	@echo >&2 '***'
1996	@false
1997endif
1998
1999ifdef CONFIG_MODULES
2000
2001modules.order: $(build-dir)
2002	@:
2003
2004# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
2005# This is solely useful to speed up test compiles.
2006modules: modpost
2007ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2008	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2009endif
2010
2011PHONY += modules_check
2012modules_check: modules.order
2013	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
2014
2015else # CONFIG_MODULES
2016
2017modules:
2018	@:
2019
2020KBUILD_MODULES :=
2021
2022endif # CONFIG_MODULES
2023
2024PHONY += modpost
2025modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
2026	 $(if $(KBUILD_MODULES), modules_check)
2027	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2028
2029# Single targets
2030# ---------------------------------------------------------------------------
2031# To build individual files in subdirectories, you can do like this:
2032#
2033#   make foo/bar/baz.s
2034#
2035# The supported suffixes for single-target are listed in 'single-targets'
2036#
2037# To build only under specific subdirectories, you can do like this:
2038#
2039#   make foo/bar/baz/
2040
2041ifdef single-build
2042
2043# .ko is special because modpost is needed
2044single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
2045single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
2046		$(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
2047
2048$(single-ko): single_modules
2049	@:
2050$(single-no-ko): $(build-dir)
2051	@:
2052
2053# Remove modules.order when done because it is not the real one.
2054PHONY += single_modules
2055single_modules: $(single-no-ko) modules_prepare
2056	$(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order
2057	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2058ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2059	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2060endif
2061	$(Q)rm -f modules.order
2062
2063single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2064
2065KBUILD_MODULES := y
2066
2067endif
2068
2069prepare: outputmakefile
2070
2071# Preset locale variables to speed up the build process. Limit locale
2072# tweaks to this spot to avoid wrong language settings when running
2073# make menuconfig etc.
2074# Error messages still appears in the original language
2075PHONY += $(build-dir)
2076$(build-dir): prepare
2077	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2078
2079clean-dirs := $(addprefix _clean_, $(clean-dirs))
2080PHONY += $(clean-dirs) clean
2081$(clean-dirs):
2082	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2083
2084clean: $(clean-dirs)
2085	$(call cmd,rmfiles)
2086	@find . $(RCS_FIND_IGNORE) \
2087		\( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2088		-o -name '*.ko.*' \
2089		-o -name '*.dtb' -o -name '*.dtbo' \
2090		-o -name '*.dtb.S' -o -name '*.dtbo.S' \
2091		-o -name '*.dt.yaml' -o -name 'dtbs-list' \
2092		-o -name '*.dwo' -o -name '*.lst' \
2093		-o -name '*.su' -o -name '*.mod' \
2094		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2095		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
2096		-o -name '*.asn1.[ch]' \
2097		-o -name '*.symtypes' -o -name 'modules.order' \
2098		-o -name '*.c.[012]*.*' \
2099		-o -name '*.ll' \
2100		-o -name '*.gcno' \
2101		\) -type f -print \
2102		-o -name '.tmp_*' -print \
2103		| xargs rm -rf
2104
2105# Generate tags for editors
2106# ---------------------------------------------------------------------------
2107quiet_cmd_tags = GEN     $@
2108      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2109
2110tags TAGS cscope gtags: FORCE
2111	$(call cmd,tags)
2112
2113# Generate rust-project.json (a file that describes the structure of non-Cargo
2114# Rust projects) for rust-analyzer (an implementation of the Language Server
2115# Protocol).
2116PHONY += rust-analyzer
2117rust-analyzer:
2118	+$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
2119ifdef KBUILD_EXTMOD
2120# FIXME: external modules must not descend into a sub-directory of the kernel
2121	$(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@
2122else
2123	$(Q)$(MAKE) $(build)=rust $@
2124endif
2125
2126# Script to generate missing namespace dependencies
2127# ---------------------------------------------------------------------------
2128
2129PHONY += nsdeps
2130nsdeps: export KBUILD_NSDEPS=1
2131nsdeps: modules
2132	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2133
2134# Clang Tooling
2135# ---------------------------------------------------------------------------
2136
2137quiet_cmd_gen_compile_commands = GEN     $@
2138      cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2139
2140compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
2141	$(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2142	$(if $(CONFIG_MODULES), modules.order) FORCE
2143	$(call if_changed,gen_compile_commands)
2144
2145targets += compile_commands.json
2146
2147PHONY += clang-tidy clang-analyzer
2148
2149ifdef CONFIG_CC_IS_CLANG
2150quiet_cmd_clang_tools = CHECK   $<
2151      cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2152
2153clang-tidy clang-analyzer: compile_commands.json
2154	$(call cmd,clang_tools)
2155else
2156clang-tidy clang-analyzer:
2157	@echo "$@ requires CC=clang" >&2
2158	@false
2159endif
2160
2161# Scripts to check various things for consistency
2162# ---------------------------------------------------------------------------
2163
2164PHONY += includecheck versioncheck coccicheck
2165
2166includecheck:
2167	find $(srctree)/* $(RCS_FIND_IGNORE) \
2168		-name '*.[hcS]' -type f -print | sort \
2169		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2170
2171versioncheck:
2172	find $(srctree)/* $(RCS_FIND_IGNORE) \
2173		-name '*.[hcS]' -type f -print | sort \
2174		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2175
2176coccicheck:
2177	$(Q)$(BASH) $(srctree)/scripts/$@
2178
2179PHONY += checkstack kernelrelease kernelversion image_name
2180
2181# UML needs a little special treatment here.  It wants to use the host
2182# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2183# else wants $(ARCH), including people doing cross-builds, which means
2184# that $(SUBARCH) doesn't work here.
2185ifeq ($(ARCH), um)
2186CHECKSTACK_ARCH := $(SUBARCH)
2187else
2188CHECKSTACK_ARCH := $(ARCH)
2189endif
2190MINSTACKSIZE	?= 100
2191checkstack:
2192	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2193	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2194
2195kernelrelease:
2196	@$(filechk_kernel.release)
2197
2198kernelversion:
2199	@echo $(KERNELVERSION)
2200
2201image_name:
2202	@echo $(KBUILD_IMAGE)
2203
2204PHONY += run-command
2205run-command:
2206	$(Q)$(KBUILD_RUN_COMMAND)
2207
2208quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2209      cmd_rmfiles = rm -rf $(rm-files)
2210
2211# read saved command lines for existing targets
2212existing-targets := $(wildcard $(sort $(targets)))
2213
2214-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2215
2216endif # config-build
2217endif # mixed-build
2218endif # need-sub-make
2219
2220PHONY += FORCE
2221FORCE:
2222
2223# Declare the contents of the PHONY variable as phony.  We keep that
2224# information in a variable so we can use it in if_changed and friends.
2225.PHONY: $(PHONY)
2226