1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 6
3 PATCHLEVEL = 12
4 SUBLEVEL = 0
5 EXTRAVERSION = -rc7
6 NAME = 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
14 ifeq ($(filter output-sync,$(.FEATURES)),)
15 $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
16 endif
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
22 PHONY := __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
41 this-makefile := $(lastword $(MAKEFILE_LIST))
42 abs_srctree := $(realpath $(dir $(this-makefile)))
43 abs_objtree := $(CURDIR)
44
45 ifneq ($(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)
49 MAKEFLAGS += -rR
50
51 # Avoid funny character set dependencies
52 unexport LC_ALL
53 LC_COLLATE=C
54 LC_NUMERIC=C
55 export LC_COLLATE LC_NUMERIC
56
57 # Avoid interference with shell env settings
58 unexport 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) $(build)=scripts/basic
75 #
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
78 #
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
81
82 ifeq ("$(origin V)", "command line")
83 KBUILD_VERBOSE = $(V)
84 endif
85
86 quiet = quiet_
87 Q = @
88
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
90 quiet =
91 Q =
92 endif
93
94 # If the user is running make -s (silent mode), suppress echoing of
95 # commands
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
97 quiet=silent_
98 override KBUILD_VERBOSE :=
99 endif
100
101 export 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
113 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C)
115 endif
116 ifndef KBUILD_CHECKSRC
117 KBUILD_CHECKSRC = 0
118 endif
119
120 export KBUILD_CHECKSRC
121
122 # Enable "clippy" (a linter) as part of the Rust compilation.
123 #
124 # Use 'make CLIPPY=1' to enable it.
125 ifeq ("$(origin CLIPPY)", "command line")
126 KBUILD_CLIPPY := $(CLIPPY)
127 endif
128
129 export KBUILD_CLIPPY
130
131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132 # directory of external module to build. Setting M= takes precedence.
133 ifeq ("$(origin M)", "command line")
134 KBUILD_EXTMOD := $(M)
135 endif
136
137 $(if $(word 2, $(KBUILD_EXTMOD)), \
138 $(error building multiple external modules is not supported))
139
140 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
141 $(error module directory path cannot contain '$x')))
142
143 # Remove trailing slashes
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
146 endif
147
148 export KBUILD_EXTMOD
149
150 # backward compatibility
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
152
153 ifeq ("$(origin W)", "command line")
154 KBUILD_EXTRA_WARN := $(W)
155 endif
156
157 export KBUILD_EXTRA_WARN
158
159 # Kbuild will save output files in the current working directory.
160 # This does not need to match to the root of the kernel source tree.
161 #
162 # For example, you can do this:
163 #
164 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 #
166 # If you want to save output files in a different location, there are
167 # two syntaxes to specify it.
168 #
169 # 1) O=
170 # Use "make O=dir/to/store/output/files/"
171 #
172 # 2) Set KBUILD_OUTPUT
173 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
174 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 #
176 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
177 # variable.
178
179 # Do we want to change the working directory?
180 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O)
182 endif
183
184 ifneq ($(KBUILD_OUTPUT),)
185 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
186 $(shell mkdir -p "$(KBUILD_OUTPUT)")
187 # $(realpath ...) resolves symlinks
188 abs_objtree := $(realpath $(KBUILD_OUTPUT))
189 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
190 endif # ifneq ($(KBUILD_OUTPUT),)
191
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
193 $(error source directory cannot contain spaces or colons)
194 endif
195
196 export sub_make_done := 1
197
198 endif # sub_make_done
199
200 ifeq ($(abs_objtree),$(CURDIR))
201 # Suppress "Entering directory ..." if we are at the final work directory.
202 no-print-directory := --no-print-directory
203 else
204 # Recursion to show "Entering directory ..."
205 need-sub-make := 1
206 endif
207
208 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
209 # If --no-print-directory is unset, recurse once again to set it.
210 # You may end up recursing into __sub-make twice. This is needed due to the
211 # behavior change in GNU Make 4.4.1.
212 need-sub-make := 1
213 endif
214
215 ifeq ($(need-sub-make),1)
216
217 PHONY += $(MAKECMDGOALS) __sub-make
218
219 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
220 @:
221
222 # Invoke a second make in the output directory, passing relevant variables
223 __sub-make:
224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
226
227 else # need-sub-make
228
229 # We process the rest of the Makefile if this is the final invocation of make
230
231 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree
233 srctree := .
234 building_out_of_srctree :=
235 else
236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
237 # building in a subdirectory of the source tree
238 srctree := ..
239 else
240 srctree := $(abs_srctree)
241 endif
242 building_out_of_srctree := 1
243 endif
244
245 ifneq ($(KBUILD_ABS_SRCTREE),)
246 srctree := $(abs_srctree)
247 endif
248
249 objtree := .
250
251 VPATH :=
252
253 ifeq ($(KBUILD_EXTMOD),)
254 ifdef building_out_of_srctree
255 VPATH := $(srctree)
256 endif
257 endif
258
259 export building_out_of_srctree srctree objtree VPATH
260
261 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this case either (for *config).
268
269 version_h := include/generated/uapi/linux/version.h
270
271 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers headers_% archheaders archscripts \
275 %asm-generic kernelversion %src-pkg dt_binding_check \
276 outputmakefile rustavailable rustfmt rustfmtcheck
277 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
278 image_name
279 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
280
281 config-build :=
282 mixed-build :=
283 need-config := 1
284 may-sync-config := 1
285 single-build :=
286
287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config :=
290 endif
291 endif
292
293 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
295 may-sync-config :=
296 endif
297 endif
298
299 need-compiler := $(may-sync-config)
300
301 ifneq ($(KBUILD_EXTMOD),)
302 may-sync-config :=
303 endif
304
305 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),)
307 config-build := 1
308 ifneq ($(words $(MAKECMDGOALS)),1)
309 mixed-build := 1
310 endif
311 endif
312 endif
313
314 # We cannot build single targets and the others at the same time
315 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
316 single-build := 1
317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
318 mixed-build := 1
319 endif
320 endif
321
322 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 mixed-build := 1
326 endif
327 endif
328
329 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
332 mixed-build := 1
333 endif
334 endif
335
336 ifdef mixed-build
337 # ===========================================================================
338 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one.
340
341 PHONY += $(MAKECMDGOALS) __build_one_by_one
342
343 $(MAKECMDGOALS): __build_one_by_one
344 @:
345
346 __build_one_by_one:
347 $(Q)set -e; \
348 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile $$i; \
350 done
351
352 else # !mixed-build
353
354 include $(srctree)/scripts/Kbuild.include
355
356 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/config/kernel.release)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360
361 include $(srctree)/scripts/subarch.include
362
363 # Cross compiling and selecting different set of gcc/bin-utils
364 # ---------------------------------------------------------------------------
365 #
366 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make:
369 # make ARCH=arm64
370 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is executed.
372
373 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu-
378 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
381 ARCH ?= $(SUBARCH)
382
383 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH)
385 SRCARCH := $(ARCH)
386
387 # Additional ARCH settings for x86
388 ifeq ($(ARCH),i386)
389 SRCARCH := x86
390 endif
391 ifeq ($(ARCH),x86_64)
392 SRCARCH := x86
393 endif
394
395 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32)
397 SRCARCH := sparc
398 endif
399 ifeq ($(ARCH),sparc64)
400 SRCARCH := sparc
401 endif
402
403 # Additional ARCH settings for parisc
404 ifeq ($(ARCH),parisc64)
405 SRCARCH := parisc
406 endif
407
408 export cross_compiling :=
409 ifneq ($(SRCARCH),$(SUBARCH))
410 cross_compiling := 1
411 endif
412
413 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG
415
416 # SHELL used by kbuild
417 CONFIG_SHELL := sh
418
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
422
423 ifneq ($(LLVM),)
424 ifneq ($(filter %/,$(LLVM)),)
425 LLVM_PREFIX := $(LLVM)
426 else ifneq ($(filter -%,$(LLVM)),)
427 LLVM_SUFFIX := $(LLVM)
428 endif
429
430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
432 else
433 HOSTCC = gcc
434 HOSTCXX = g++
435 endif
436 HOSTRUSTC = rustc
437 HOSTPKG_CONFIG = pkg-config
438
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
440 -O2 -fomit-frame-pointer -std=gnu11
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
443
444 # These flags apply to all Rust code in the tree, including the kernel and
445 # host programs.
446 export rust_common_flags := --edition=2021 \
447 -Zbinary_dep_depinfo=y \
448 -Astable_features \
449 -Dunsafe_op_in_unsafe_fn \
450 -Dnon_ascii_idents \
451 -Wrust_2018_idioms \
452 -Wunreachable_pub \
453 -Wmissing_docs \
454 -Wrustdoc::missing_crate_level_docs \
455 -Wclippy::all \
456 -Wclippy::mut_mut \
457 -Wclippy::needless_bitwise_bool \
458 -Wclippy::needless_continue \
459 -Wclippy::no_mangle_with_rust_abi \
460 -Wclippy::dbg_macro
461
462 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
463 $(HOSTCFLAGS) -I $(srctree)/scripts/include
464 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
465 -I $(srctree)/scripts/include
466 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
467 -Zallow-features= $(HOSTRUSTFLAGS)
468 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
469 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
470
471 # Make variables (CC, etc...)
472 CPP = $(CC) -E
473 ifneq ($(LLVM),)
474 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
475 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
476 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
477 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
478 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
479 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
480 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
481 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
482 else
483 CC = $(CROSS_COMPILE)gcc
484 LD = $(CROSS_COMPILE)ld
485 AR = $(CROSS_COMPILE)ar
486 NM = $(CROSS_COMPILE)nm
487 OBJCOPY = $(CROSS_COMPILE)objcopy
488 OBJDUMP = $(CROSS_COMPILE)objdump
489 READELF = $(CROSS_COMPILE)readelf
490 STRIP = $(CROSS_COMPILE)strip
491 endif
492 RUSTC = rustc
493 RUSTDOC = rustdoc
494 RUSTFMT = rustfmt
495 CLIPPY_DRIVER = clippy-driver
496 BINDGEN = bindgen
497 PAHOLE = pahole
498 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
499 LEX = flex
500 YACC = bison
501 AWK = awk
502 INSTALLKERNEL := installkernel
503 PERL = perl
504 PYTHON3 = python3
505 CHECK = sparse
506 BASH = bash
507 KGZIP = gzip
508 KBZIP2 = bzip2
509 KLZOP = lzop
510 LZMA = lzma
511 LZ4 = lz4c
512 XZ = xz
513 ZSTD = zstd
514
515 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
516 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
517 NOSTDINC_FLAGS :=
518 CFLAGS_MODULE =
519 RUSTFLAGS_MODULE =
520 AFLAGS_MODULE =
521 LDFLAGS_MODULE =
522 CFLAGS_KERNEL =
523 RUSTFLAGS_KERNEL =
524 AFLAGS_KERNEL =
525 LDFLAGS_vmlinux =
526
527 # Use USERINCLUDE when you must reference the UAPI directories only.
528 USERINCLUDE := \
529 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
530 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
531 -I$(srctree)/include/uapi \
532 -I$(objtree)/include/generated/uapi \
533 -include $(srctree)/include/linux/compiler-version.h \
534 -include $(srctree)/include/linux/kconfig.h
535
536 # Use LINUXINCLUDE when you must reference the include/ directory.
537 # Needed to be compatible with the O= option
538 LINUXINCLUDE := \
539 -I$(srctree)/arch/$(SRCARCH)/include \
540 -I$(objtree)/arch/$(SRCARCH)/include/generated \
541 $(if $(building_out_of_srctree),-I$(srctree)/include) \
542 -I$(objtree)/include \
543 $(USERINCLUDE)
544
545 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
546
547 KBUILD_CFLAGS :=
548 KBUILD_CFLAGS += -std=gnu11
549 KBUILD_CFLAGS += -fshort-wchar
550 KBUILD_CFLAGS += -funsigned-char
551 KBUILD_CFLAGS += -fno-common
552 KBUILD_CFLAGS += -fno-PIE
553 KBUILD_CFLAGS += -fno-strict-aliasing
554
555 KBUILD_CPPFLAGS := -D__KERNEL__
556 KBUILD_RUSTFLAGS := $(rust_common_flags) \
557 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
558 -Cforce-unwind-tables=n -Ccodegen-units=1 \
559 -Csymbol-mangling-version=v0 \
560 -Crelocation-model=static \
561 -Zfunction-sections=n \
562 -Wclippy::float_arithmetic
563
564 KBUILD_AFLAGS_KERNEL :=
565 KBUILD_CFLAGS_KERNEL :=
566 KBUILD_RUSTFLAGS_KERNEL :=
567 KBUILD_AFLAGS_MODULE := -DMODULE
568 KBUILD_CFLAGS_MODULE := -DMODULE
569 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
570 KBUILD_LDFLAGS_MODULE :=
571 KBUILD_LDFLAGS :=
572 CLANG_FLAGS :=
573
574 ifeq ($(KBUILD_CLIPPY),1)
575 RUSTC_OR_CLIPPY_QUIET := CLIPPY
576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
577 else
578 RUSTC_OR_CLIPPY_QUIET := RUSTC
579 RUSTC_OR_CLIPPY = $(RUSTC)
580 endif
581
582 # Allows the usage of unstable features in stable compilers.
583 export RUSTC_BOOTSTRAP := 1
584
585 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
586 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
587 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
588 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
589 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
590 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
591 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
592 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
593
594 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
595 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
596 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
597 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
598 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
599 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
600
601 # Files to ignore in find ... statements
602
603 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
604 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
605 -prune -o
606
607 # ===========================================================================
608 # Rules shared between *config targets and build targets
609
610 # Basic helpers built in scripts/basic/
611 PHONY += scripts_basic
612 scripts_basic:
613 $(Q)$(MAKE) $(build)=scripts/basic
614
615 PHONY += outputmakefile
616 ifdef building_out_of_srctree
617 # Before starting out-of-tree build, make sure the source tree is clean.
618 # outputmakefile generates a Makefile in the output directory, if using a
619 # separate output directory. This allows convenient use of make in the
620 # output directory.
621 # At the same time when output Makefile generated, generate .gitignore to
622 # ignore whole output directory
623
624 quiet_cmd_makefile = GEN Makefile
625 cmd_makefile = { \
626 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
627 echo "include $(srctree)/Makefile"; \
628 } > Makefile
629
630 outputmakefile:
631 @if [ -f $(srctree)/.config -o \
632 -d $(srctree)/include/config -o \
633 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
634 echo >&2 "***"; \
635 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
636 echo >&2 "*** in $(abs_srctree)";\
637 echo >&2 "***"; \
638 false; \
639 fi
640 $(Q)ln -fsn $(srctree) source
641 $(call cmd,makefile)
642 $(Q)test -e .gitignore || \
643 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
644 endif
645
646 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
647 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
648 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they
649 # need export), and from include/config/auto.conf.cmd to detect the compiler
650 # upgrade.
651 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
652 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
653
654 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
655 include $(srctree)/scripts/Makefile.clang
656 endif
657
658 # Include this also for config targets because some architectures need
659 # cc-cross-prefix to determine CROSS_COMPILE.
660 ifdef need-compiler
661 include $(srctree)/scripts/Makefile.compiler
662 endif
663
664 ifdef config-build
665 # ===========================================================================
666 # *config targets only - make sure prerequisites are updated, and descend
667 # in scripts/kconfig to make the *config target
668
669 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
670 # KBUILD_DEFCONFIG may point out an alternative default configuration
671 # used for 'make defconfig'
672 include $(srctree)/arch/$(SRCARCH)/Makefile
673 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT
674
675 config: outputmakefile scripts_basic FORCE
676 $(Q)$(MAKE) $(build)=scripts/kconfig $@
677
678 %config: outputmakefile scripts_basic FORCE
679 $(Q)$(MAKE) $(build)=scripts/kconfig $@
680
681 else #!config-build
682 # ===========================================================================
683 # Build targets only - this includes vmlinux, arch-specific targets, clean
684 # targets and others. In general all targets except *config targets.
685
686 # If building an external module we do not care about the all: rule
687 # but instead __all depend on modules
688 PHONY += all
689 ifeq ($(KBUILD_EXTMOD),)
690 __all: all
691 else
692 __all: modules
693 endif
694
695 targets :=
696
697 # Decide whether to build built-in, modular, or both.
698 # Normally, just do built-in.
699
700 KBUILD_MODULES :=
701 KBUILD_BUILTIN := 1
702
703 # If we have only "make modules", don't compile built-in objects.
704 ifeq ($(MAKECMDGOALS),modules)
705 KBUILD_BUILTIN :=
706 endif
707
708 # If we have "make <whatever> modules", compile modules
709 # in addition to whatever we do anyway.
710 # Just "make" or "make all" shall build modules as well
711
712 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
713 KBUILD_MODULES := 1
714 endif
715
716 ifeq ($(MAKECMDGOALS),)
717 KBUILD_MODULES := 1
718 endif
719
720 export KBUILD_MODULES KBUILD_BUILTIN
721
722 ifdef need-config
723 include include/config/auto.conf
724 endif
725
726 ifeq ($(KBUILD_EXTMOD),)
727 # Objects we will link into vmlinux / subdirs we need to visit
728 core-y :=
729 drivers-y :=
730 libs-y := lib/
731 endif # KBUILD_EXTMOD
732
733 # The all: target is the default when no target is given on the
734 # command line.
735 # This allow a user to issue only 'make' to build a kernel including modules
736 # Defaults to vmlinux, but the arch makefile usually adds further targets
737 all: vmlinux
738
739 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
740 ifdef CONFIG_CC_IS_GCC
741 CFLAGS_GCOV += -fno-tree-loop-im
742 endif
743 export CFLAGS_GCOV
744
745 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
746 ifdef CONFIG_FUNCTION_TRACER
747 CC_FLAGS_FTRACE := -pg
748 endif
749
750 include $(srctree)/arch/$(SRCARCH)/Makefile
751
752 ifdef need-config
753 ifdef may-sync-config
754 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
755 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
756 # because some architectures define CROSS_COMPILE there.
757 include include/config/auto.conf.cmd
758
759 $(KCONFIG_CONFIG):
760 @echo >&2 '***'
761 @echo >&2 '*** Configuration file "$@" not found!'
762 @echo >&2 '***'
763 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
764 @echo >&2 '*** "make menuconfig" or "make xconfig").'
765 @echo >&2 '***'
766 @/bin/false
767
768 # The actual configuration files used during the build are stored in
769 # include/generated/ and include/config/. Update them if .config is newer than
770 # include/config/auto.conf (which mirrors .config).
771 #
772 # This exploits the 'multi-target pattern rule' trick.
773 # The syncconfig should be executed only once to make all the targets.
774 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
775 #
776 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
777 # so you cannot notice that Kconfig is waiting for the user input.
778 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
779 $(Q)$(kecho) " SYNC $@"
780 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
781 else # !may-sync-config
782 # External modules and some install targets need include/generated/autoconf.h
783 # and include/config/auto.conf but do not care if they are up-to-date.
784 # Use auto.conf to trigger the test
785 PHONY += include/config/auto.conf
786
787 include/config/auto.conf:
788 @test -e include/generated/autoconf.h -a -e $@ || ( \
789 echo >&2; \
790 echo >&2 " ERROR: Kernel configuration is invalid."; \
791 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
792 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
793 echo >&2 ; \
794 /bin/false)
795
796 endif # may-sync-config
797 endif # need-config
798
799 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
800
801 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
802 KBUILD_CFLAGS += -O2
803 KBUILD_RUSTFLAGS += -Copt-level=2
804 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
805 KBUILD_CFLAGS += -Os
806 KBUILD_RUSTFLAGS += -Copt-level=s
807 endif
808
809 # Always set `debug-assertions` and `overflow-checks` because their default
810 # depends on `opt-level` and `debug-assertions`, respectively.
811 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
812 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
813
814 # Tell gcc to never replace conditional load with a non-conditional one
815 ifdef CONFIG_CC_IS_GCC
816 # gcc-10 renamed --param=allow-store-data-races=0 to
817 # -fno-allow-store-data-races.
818 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
819 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
820 endif
821
822 ifdef CONFIG_READABLE_ASM
823 # Disable optimizations that make assembler listings hard to read.
824 # reorder blocks reorders the control in the function
825 # ipa clone creates specialized cloned functions
826 # partial inlining inlines only parts of functions
827 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
828 endif
829
830 stackp-flags-y := -fno-stack-protector
831 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
832 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
833
834 KBUILD_CFLAGS += $(stackp-flags-y)
835
836 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
837 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
838
839 ifdef CONFIG_FRAME_POINTER
840 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
841 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
842 else
843 # Some targets (ARM with Thumb2, for example), can't be built with frame
844 # pointers. For those, we don't have FUNCTION_TRACER automatically
845 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
846 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
847 # -fomit-frame-pointer with FUNCTION_TRACER.
848 # In the Rust target specification, "frame-pointer" is set explicitly
849 # to "may-omit".
850 ifndef CONFIG_FUNCTION_TRACER
851 KBUILD_CFLAGS += -fomit-frame-pointer
852 endif
853 endif
854
855 # Initialize all stack variables with a 0xAA pattern.
856 ifdef CONFIG_INIT_STACK_ALL_PATTERN
857 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
858 endif
859
860 # Initialize all stack variables with a zero value.
861 ifdef CONFIG_INIT_STACK_ALL_ZERO
862 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
863 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
864 # https://github.com/llvm/llvm-project/issues/44842
865 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
866 export CC_AUTO_VAR_INIT_ZERO_ENABLER
867 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
868 endif
869 endif
870
871 # While VLAs have been removed, GCC produces unreachable stack probes
872 # for the randomize_kstack_offset feature. Disable it for all compilers.
873 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
874
875 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
876 ifdef CONFIG_ZERO_CALL_USED_REGS
877 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
878 endif
879
880 ifdef CONFIG_FUNCTION_TRACER
881 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
882 CC_FLAGS_FTRACE += -mrecord-mcount
883 ifdef CONFIG_HAVE_NOP_MCOUNT
884 ifeq ($(call cc-option-yn, -mnop-mcount),y)
885 CC_FLAGS_FTRACE += -mnop-mcount
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
887 endif
888 endif
889 endif
890 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
891 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
892 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
893 endif
894 endif
895 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
896 ifdef CONFIG_HAVE_C_RECORDMCOUNT
897 BUILD_C_RECORDMCOUNT := y
898 export BUILD_C_RECORDMCOUNT
899 endif
900 endif
901 ifdef CONFIG_HAVE_FENTRY
902 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
903 ifeq ($(call cc-option-yn, -mfentry),y)
904 CC_FLAGS_FTRACE += -mfentry
905 CC_FLAGS_USING += -DCC_USING_FENTRY
906 endif
907 endif
908 export CC_FLAGS_FTRACE
909 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
910 KBUILD_AFLAGS += $(CC_FLAGS_USING)
911 endif
912
913 # We trigger additional mismatches with less inlining
914 ifdef CONFIG_DEBUG_SECTION_MISMATCH
915 KBUILD_CFLAGS += -fno-inline-functions-called-once
916 endif
917
918 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
919 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
920 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
921 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
922 LDFLAGS_vmlinux += --gc-sections
923 endif
924
925 ifdef CONFIG_SHADOW_CALL_STACK
926 ifndef CONFIG_DYNAMIC_SCS
927 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
928 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
929 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
930 endif
931 export CC_FLAGS_SCS
932 endif
933
934 ifdef CONFIG_LTO_CLANG
935 ifdef CONFIG_LTO_CLANG_THIN
936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
937 else
938 CC_FLAGS_LTO := -flto
939 endif
940 CC_FLAGS_LTO += -fvisibility=hidden
941
942 # Limit inlining across translation units to reduce binary size
943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
944 endif
945
946 ifdef CONFIG_LTO
947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
948 KBUILD_AFLAGS += -fno-lto
949 export CC_FLAGS_LTO
950 endif
951
952 ifdef CONFIG_CFI_CLANG
953 CC_FLAGS_CFI := -fsanitize=kcfi
954 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
955 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers
956 endif
957 ifdef CONFIG_RUST
958 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
959 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
960 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
961 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
962 export RUSTC_FLAGS_CFI
963 endif
964 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
965 export CC_FLAGS_CFI
966 endif
967
968 # Architectures can define flags to add/remove for floating-point support
969 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT
970 export CC_FLAGS_FPU
971 export CC_FLAGS_NO_FPU
972
973 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
974 # Set the minimal function alignment. Use the newer GCC option
975 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
976 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
977 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
978 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
979 else
980 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
981 endif
982 endif
983
984 # arch Makefile may override CC so keep this after arch Makefile is included
985 NOSTDINC_FLAGS += -nostdinc
986
987 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
988 # the kernel uses only C99 flexible arrays for dynamically sized trailing
989 # arrays. Enforce this for everything that may examine structure sizes and
990 # perform bounds checking.
991 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
992
993 #Currently, disable -Wstringop-overflow for GCC 11, globally.
994 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
995 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
996
997 # disable invalid "can't wrap" optimizations for signed / pointers
998 KBUILD_CFLAGS += -fno-strict-overflow
999
1000 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1001 KBUILD_CFLAGS += -fno-stack-check
1002
1003 # conserve stack if available
1004 ifdef CONFIG_CC_IS_GCC
1005 KBUILD_CFLAGS += -fconserve-stack
1006 endif
1007
1008 # change __FILE__ to the relative path from the srctree
1009 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1010
1011 # include additional Makefiles when needed
1012 include-y := scripts/Makefile.extrawarn
1013 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1014 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1015 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1016 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1017 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1018 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1019 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1020 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1022
1023 include $(addprefix $(srctree)/, $(include-y))
1024
1025 # scripts/Makefile.gcc-plugins is intentionally included last.
1026 # Do not add $(call cc-option,...) below this line. When you build the kernel
1027 # from the clean source tree, the GCC plugins do not exist at this point.
1028
1029 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1030 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1031 KBUILD_AFLAGS += $(KAFLAGS)
1032 KBUILD_CFLAGS += $(KCFLAGS)
1033 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1034
1035 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1036 LDFLAGS_vmlinux += --build-id=sha1
1037
1038 KBUILD_LDFLAGS += -z noexecstack
1039 ifeq ($(CONFIG_LD_IS_BFD),y)
1040 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1041 endif
1042
1043 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1044 LDFLAGS_vmlinux += -X
1045 endif
1046
1047 ifeq ($(CONFIG_RELR),y)
1048 # ld.lld before 15 did not support -z pack-relative-relocs.
1049 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1050 endif
1051
1052 # We never want expected sections to be placed heuristically by the
1053 # linker. All sections should be explicitly named in the linker script.
1054 ifdef CONFIG_LD_ORPHAN_WARN
1055 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1056 endif
1057
1058 # Align the bit size of userspace programs with the kernel
1059 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1060 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1061
1062 # make the checker run with the right architecture
1063 CHECKFLAGS += --arch=$(ARCH)
1064
1065 # insure the checker run with the right endianness
1066 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1067
1068 # the checker needs the correct machine size
1069 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1070
1071 # Default kernel image to build when no specific target is given.
1072 # KBUILD_IMAGE may be overruled on the command line or
1073 # set in the environment
1074 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1075 # this default value
1076 export KBUILD_IMAGE ?= vmlinux
1077
1078 #
1079 # INSTALL_PATH specifies where to place the updated kernel and system map
1080 # images. Default is /boot, but you can set it to other values
1081 export INSTALL_PATH ?= /boot
1082
1083 #
1084 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1085 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1086 # an argument if needed. Otherwise it defaults to the kernel install path
1087 #
1088 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1089
1090 #
1091 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1092 # relocations required by build roots. This is not defined in the
1093 # makefile but the argument can be passed to make if needed.
1094 #
1095
1096 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1097 export MODLIB
1098
1099 PHONY += prepare0
1100
1101 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1102 export MODORDER := $(extmod_prefix)modules.order
1103 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1104
1105 ifeq ($(KBUILD_EXTMOD),)
1106
1107 build-dir := .
1108 clean-dirs := $(sort . Documentation \
1109 $(patsubst %/,%,$(filter %/, $(core-) \
1110 $(drivers-) $(libs-))))
1111
1112 export ARCH_CORE := $(core-y)
1113 export ARCH_LIB := $(filter %/, $(libs-y))
1114 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1115 # Externally visible symbols (used by link-vmlinux.sh)
1116
1117 KBUILD_VMLINUX_OBJS := ./built-in.a
1118 ifdef CONFIG_MODULES
1119 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1120 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1121 else
1122 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1123 endif
1124
1125 export KBUILD_VMLINUX_LIBS
1126 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1127
1128 ifdef CONFIG_TRIM_UNUSED_KSYMS
1129 # For the kernel to actually contain only the needed exported symbols,
1130 # we have to build modules as well to determine what those symbols are.
1131 KBUILD_MODULES := 1
1132 endif
1133
1134 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1135 quiet_cmd_ar_vmlinux.a = AR $@
1136 cmd_ar_vmlinux.a = \
1137 rm -f $@; \
1138 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1139 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1140
1141 targets += vmlinux.a
1142 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1143 $(call if_changed,ar_vmlinux.a)
1144
1145 PHONY += vmlinux_o
1146 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1147 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1148
1149 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1150 @:
1151
1152 PHONY += vmlinux
1153 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1154 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1155 # unrelated; the decompressors just happen to have the same base name,
1156 # arch/*/boot/compressed/vmlinux.
1157 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1158 #
1159 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1160 # https://savannah.gnu.org/bugs/?61463
1161 # For Make > 4.4, the following simple code will work:
1162 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1163 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1164 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1165 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1166 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1167
1168 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in
1170 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1171
1172 ifeq ($(origin KERNELRELEASE),file)
1173 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1174 else
1175 filechk_kernel.release = echo $(KERNELRELEASE)
1176 endif
1177
1178 # Store (new) KERNELRELEASE string in include/config/kernel.release
1179 include/config/kernel.release: FORCE
1180 $(call filechk,kernel.release)
1181
1182 # Additional helpers built in scripts/
1183 # Carefully list dependencies so we do not try to build scripts twice
1184 # in parallel
1185 PHONY += scripts
1186 scripts: scripts_basic scripts_dtc
1187 $(Q)$(MAKE) $(build)=$(@)
1188
1189 # Things we need to do before we recursively start building the kernel
1190 # or the modules are listed in "prepare".
1191 # A multi level approach is used. prepareN is processed before prepareN-1.
1192 # archprepare is used in arch Makefiles and when processed asm symlink,
1193 # version.h and scripts_basic is processed / created.
1194
1195 PHONY += prepare archprepare
1196
1197 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1198 asm-generic $(version_h) include/generated/utsrelease.h \
1199 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1200
1201 prepare0: archprepare
1202 $(Q)$(MAKE) $(build)=scripts/mod
1203 $(Q)$(MAKE) $(build)=. prepare
1204
1205 # All the preparing..
1206 prepare: prepare0
1207 ifdef CONFIG_RUST
1208 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1209 $(Q)$(MAKE) $(build)=rust
1210 endif
1211
1212 PHONY += remove-stale-files
1213 remove-stale-files:
1214 $(Q)$(srctree)/scripts/remove-stale-files
1215
1216 # Support for using generic headers in asm-generic
1217 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1218
1219 PHONY += asm-generic uapi-asm-generic
1220 asm-generic: uapi-asm-generic
1221 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1222 generic=include/asm-generic
1223 uapi-asm-generic:
1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1225 generic=include/uapi/asm-generic
1226
1227 # Generate some files
1228 # ---------------------------------------------------------------------------
1229
1230 # KERNELRELEASE can change from a few different places, meaning version.h
1231 # needs to be updated, so this check is forced on all builds
1232
1233 uts_len := 64
1234 define filechk_utsrelease.h
1235 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1236 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1237 exit 1; \
1238 fi; \
1239 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1240 endef
1241
1242 define filechk_version.h
1243 if [ $(SUBLEVEL) -gt 255 ]; then \
1244 echo \#define LINUX_VERSION_CODE $(shell \
1245 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1246 else \
1247 echo \#define LINUX_VERSION_CODE $(shell \
1248 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1249 fi; \
1250 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1251 ((c) > 255 ? 255 : (c)))'; \
1252 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1253 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1254 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1255 endef
1256
1257 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1258 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1259 $(version_h): FORCE
1260 $(call filechk,version.h)
1261
1262 include/generated/utsrelease.h: include/config/kernel.release FORCE
1263 $(call filechk,utsrelease.h)
1264
1265 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1266 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1267
1268 include/generated/compile.h: FORCE
1269 $(call filechk,compile.h)
1270
1271 PHONY += headerdep
1272 headerdep:
1273 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275
1276 # ---------------------------------------------------------------------------
1277 # Kernel headers
1278
1279 #Default location for installed headers
1280 export INSTALL_HDR_PATH = $(objtree)/usr
1281
1282 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1283 cmd_headers_install = \
1284 mkdir -p $(INSTALL_HDR_PATH); \
1285 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1286 usr/include $(INSTALL_HDR_PATH)
1287
1288 PHONY += headers_install
1289 headers_install: headers
1290 $(call cmd,headers_install)
1291
1292 PHONY += archheaders archscripts
1293
1294 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295
1296 PHONY += headers
1297 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1298 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1301
1302 ifdef CONFIG_HEADERS_INSTALL
1303 prepare: headers
1304 endif
1305
1306 PHONY += scripts_unifdef
1307 scripts_unifdef: scripts_basic
1308 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1309
1310 # ---------------------------------------------------------------------------
1311 # Install
1312
1313 # Many distributions have the custom install script, /sbin/installkernel.
1314 # If DKMS is installed, 'make install' will eventually recurse back
1315 # to this Makefile to build and install external modules.
1316 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1317
1318 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1319 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1320
1321 # ---------------------------------------------------------------------------
1322 # vDSO install
1323
1324 PHONY += vdso_install
1325 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1326 vdso_install:
1327 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1328
1329 # ---------------------------------------------------------------------------
1330 # Tools
1331
1332 ifdef CONFIG_OBJTOOL
1333 prepare: tools/objtool
1334 endif
1335
1336 ifdef CONFIG_BPF
1337 ifdef CONFIG_DEBUG_INFO_BTF
1338 prepare: tools/bpf/resolve_btfids
1339 endif
1340 endif
1341
1342 # The tools build system is not a part of Kbuild and tends to introduce
1343 # its own unique issues. If you need to integrate a new tool into Kbuild,
1344 # please consider locating that tool outside the tools/ tree and using the
1345 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1346 # here. See Documentation/kbuild/makefiles.rst for details.
1347
1348 PHONY += resolve_btfids_clean
1349
1350 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1351
1352 # tools/bpf/resolve_btfids directory might not exist
1353 # in output directory, skip its clean in that case
1354 resolve_btfids_clean:
1355 ifneq ($(wildcard $(resolve_btfids_O)),)
1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1357 endif
1358
1359 # Clear a bunch of variables before executing the submake
1360 ifeq ($(quiet),silent_)
1361 tools_silent=s
1362 endif
1363
1364 tools/: FORCE
1365 $(Q)mkdir -p $(objtree)/tools
1366 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1367
1368 tools/%: FORCE
1369 $(Q)mkdir -p $(objtree)/tools
1370 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1371
1372 # ---------------------------------------------------------------------------
1373 # Kernel selftest
1374
1375 PHONY += kselftest
1376 kselftest: headers
1377 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1378
1379 kselftest-%: headers FORCE
1380 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1381
1382 PHONY += kselftest-merge
1383 kselftest-merge:
1384 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1385 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1386 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1387 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1388
1389 # ---------------------------------------------------------------------------
1390 # Devicetree files
1391
1392 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1393 dtstree := arch/$(SRCARCH)/boot/dts
1394 endif
1395
1396 ifneq ($(dtstree),)
1397
1398 %.dtb: dtbs_prepare
1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1400
1401 %.dtbo: dtbs_prepare
1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1403
1404 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1405 dtbs: dtbs_prepare
1406 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1407
1408 # include/config/kernel.release is actually needed when installing DTBs because
1409 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1410 # dtbs_install depend on it as dtbs_install may run as root.
1411 dtbs_prepare: include/config/kernel.release scripts_dtc
1412
1413 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1414 export CHECK_DTBS=y
1415 endif
1416
1417 ifneq ($(CHECK_DTBS),)
1418 dtbs_prepare: dt_binding_schemas
1419 endif
1420
1421 dtbs_check: dtbs
1422
1423 dtbs_install:
1424 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1425
1426 ifdef CONFIG_OF_EARLY_FLATTREE
1427 all: dtbs
1428 endif
1429
1430 endif
1431
1432 PHONY += scripts_dtc
1433 scripts_dtc: scripts_basic
1434 $(Q)$(MAKE) $(build)=scripts/dtc
1435
1436 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1437 export CHECK_DTBS=y
1438 endif
1439
1440 PHONY += dt_binding_check dt_binding_schemas
1441 dt_binding_check: dt_binding_schemas scripts_dtc
1442 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1443
1444 dt_binding_schemas:
1445 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1446
1447 PHONY += dt_compatible_check
1448 dt_compatible_check: dt_binding_schemas
1449 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1450
1451 # ---------------------------------------------------------------------------
1452 # Modules
1453
1454 ifdef CONFIG_MODULES
1455
1456 # By default, build modules as well
1457
1458 all: modules
1459
1460 # When we're building modules with modversions, we need to consider
1461 # the built-in objects during the descend as well, in order to
1462 # make sure the checksums are up to date before we record them.
1463 ifdef CONFIG_MODVERSIONS
1464 KBUILD_BUILTIN := 1
1465 endif
1466
1467 # Build modules
1468 #
1469
1470 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1471 # is an exception.
1472 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1473 KBUILD_BUILTIN := 1
1474 modules: vmlinux
1475 endif
1476
1477 modules: modules_prepare
1478
1479 # Target to prepare building external modules
1480 modules_prepare: prepare
1481 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1482
1483 endif # CONFIG_MODULES
1484
1485 ###
1486 # Cleaning is done on three levels.
1487 # make clean Delete most generated files
1488 # Leave enough to build external modules
1489 # make mrproper Delete the current configuration, and all generated files
1490 # make distclean Remove editor backup files, patch leftover files and the like
1491
1492 # Directories & files removed with 'make clean'
1493 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1494 modules.builtin modules.builtin.modinfo modules.nsdeps \
1495 modules.builtin.ranges vmlinux.o.map \
1496 compile_commands.json rust/test \
1497 rust-project.json .vmlinux.objs .vmlinux.export.c
1498
1499 # Directories & files removed with 'make mrproper'
1500 MRPROPER_FILES += include/config include/generated \
1501 arch/$(SRCARCH)/include/generated .objdiff \
1502 debian snap tar-install PKGBUILD pacman \
1503 .config .config.old .version \
1504 Module.symvers \
1505 certs/signing_key.pem \
1506 certs/x509.genkey \
1507 vmlinux-gdb.py \
1508 rpmbuild \
1509 rust/libmacros.so
1510
1511 # clean - Delete most, but leave enough to build external modules
1512 #
1513 clean: private rm-files := $(CLEAN_FILES)
1514
1515 PHONY += archclean vmlinuxclean
1516
1517 vmlinuxclean:
1518 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1520
1521 clean: archclean vmlinuxclean resolve_btfids_clean
1522
1523 # mrproper - Delete all generated files, including .config
1524 #
1525 mrproper: private rm-files := $(MRPROPER_FILES)
1526 mrproper-dirs := $(addprefix _mrproper_,scripts)
1527
1528 PHONY += $(mrproper-dirs) mrproper
1529 $(mrproper-dirs):
1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1531
1532 mrproper: clean $(mrproper-dirs)
1533 $(call cmd,rmfiles)
1534 @find . $(RCS_FIND_IGNORE) \
1535 \( -name '*.rmeta' \) \
1536 -type f -print | xargs rm -f
1537
1538 # distclean
1539 #
1540 PHONY += distclean
1541
1542 distclean: mrproper
1543 @find . $(RCS_FIND_IGNORE) \
1544 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1545 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1546 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1547 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1548 -type f -print | xargs rm -f
1549
1550
1551 # Packaging of the kernel to various formats
1552 # ---------------------------------------------------------------------------
1553
1554 %src-pkg: FORCE
1555 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1556 %pkg: include/config/kernel.release FORCE
1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1558
1559 # Brief documentation of the typical targets used
1560 # ---------------------------------------------------------------------------
1561
1562 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1563 boards := $(sort $(notdir $(boards)))
1564 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1565 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1566
1567 PHONY += help
1568 help:
1569 @echo 'Cleaning targets:'
1570 @echo ' clean - Remove most generated files but keep the config and'
1571 @echo ' enough build support to build external modules'
1572 @echo ' mrproper - Remove all generated files + config + various backup files'
1573 @echo ' distclean - mrproper + remove editor backup and patch files'
1574 @echo ''
1575 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1576 @echo ''
1577 @echo 'Other generic targets:'
1578 @echo ' all - Build all targets marked with [*]'
1579 @echo '* vmlinux - Build the bare kernel'
1580 @echo '* modules - Build all modules'
1581 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1582 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1583 @echo ' dir/ - Build all files in dir and below'
1584 @echo ' dir/file.[ois] - Build specified target only'
1585 @echo ' dir/file.ll - Build the LLVM assembly file'
1586 @echo ' (requires compiler support for LLVM assembly generation)'
1587 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1588 @echo ' (requires a recent binutils and recent build (System.map))'
1589 @echo ' dir/file.ko - Build module including final link'
1590 @echo ' modules_prepare - Set up for building external modules'
1591 @echo ' tags/TAGS - Generate tags file for editors'
1592 @echo ' cscope - Generate cscope index'
1593 @echo ' gtags - Generate GNU GLOBAL index'
1594 @echo ' kernelrelease - Output the release version string (use with make -s)'
1595 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1596 @echo ' image_name - Output the image name (use with make -s)'
1597 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1598 echo ' (default: $(INSTALL_HDR_PATH))'; \
1599 echo ''
1600 @echo 'Static analysers:'
1601 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1602 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1603 @echo ' versioncheck - Sanity check on version.h usage'
1604 @echo ' includecheck - Check for duplicate included header files'
1605 @echo ' export_report - List the usages of all exported symbols'
1606 @echo ' headerdep - Detect inclusion cycles in headers'
1607 @echo ' coccicheck - Check with Coccinelle'
1608 @echo ' clang-analyzer - Check with clang static analyzer'
1609 @echo ' clang-tidy - Check with clang-tidy'
1610 @echo ''
1611 @echo 'Tools:'
1612 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1613 @echo ''
1614 @echo 'Kernel selftest:'
1615 @echo ' kselftest - Build and run kernel selftest'
1616 @echo ' Build, install, and boot kernel before'
1617 @echo ' running kselftest on it'
1618 @echo ' Run as root for full coverage'
1619 @echo ' kselftest-all - Build kernel selftest'
1620 @echo ' kselftest-install - Build and install kernel selftest'
1621 @echo ' kselftest-clean - Remove all generated kselftest files'
1622 @echo ' kselftest-merge - Merge all the config dependencies of'
1623 @echo ' kselftest to existing .config.'
1624 @echo ''
1625 @echo 'Rust targets:'
1626 @echo ' rustavailable - Checks whether the Rust toolchain is'
1627 @echo ' available and, if not, explains why.'
1628 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1629 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1630 @echo ' is formatted, printing a diff otherwise.'
1631 @echo ' rustdoc - Generate Rust documentation'
1632 @echo ' (requires kernel .config)'
1633 @echo ' rusttest - Runs the Rust tests'
1634 @echo ' (requires kernel .config; downloads external repos)'
1635 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1636 @echo ' (requires kernel .config)'
1637 @echo ' dir/file.[os] - Build specified target only'
1638 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1639 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1640 @echo ' The output is not intended to be compilable.'
1641 @echo ' dir/file.ll - Build the LLVM assembly file'
1642 @echo ''
1643 @$(if $(dtstree), \
1644 echo 'Devicetree:'; \
1645 echo '* dtbs - Build device tree blobs for enabled boards'; \
1646 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1647 echo ' dt_binding_check - Validate device tree binding documents and examples'; \
1648 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \
1649 echo ' dtbs_check - Validate device tree source files';\
1650 echo '')
1651
1652 @echo 'Userspace tools targets:'
1653 @echo ' use "make tools/help"'
1654 @echo ' or "cd tools; make help"'
1655 @echo ''
1656 @echo 'Kernel packaging:'
1657 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1658 @echo ''
1659 @echo 'Documentation targets:'
1660 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1661 @echo ''
1662 @echo 'Architecture-specific targets ($(SRCARCH)):'
1663 @$(or $(archhelp),\
1664 echo ' No architecture-specific help defined for $(SRCARCH)')
1665 @echo ''
1666 @$(if $(boards), \
1667 $(foreach b, $(boards), \
1668 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1669 echo '')
1670 @$(if $(board-dirs), \
1671 $(foreach b, $(board-dirs), \
1672 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1673 printf " %-16s - Show all of the above\\n" help-boards; \
1674 echo '')
1675
1676 @echo ' make V=n [targets] 1: verbose build'
1677 @echo ' 2: give reason for rebuild of target'
1678 @echo ' V=1 and V=2 can be combined with V=12'
1679 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1680 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1681 @echo ' (sparse by default)'
1682 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1683 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1684 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1685 @echo ' 1: warnings which may be relevant and do not occur too often'
1686 @echo ' 2: warnings which occur quite often but may still be relevant'
1687 @echo ' 3: more obscure warnings, can most likely be ignored'
1688 @echo ' c: extra checks in the configuration stage (Kconfig)'
1689 @echo ' e: warnings are being treated as errors'
1690 @echo ' Multiple levels can be combined with W=12 or W=123'
1691 @$(if $(dtstree), \
1692 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1693 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1694 )
1695 @echo ''
1696 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1697 @echo 'For further info see the ./README file'
1698
1699
1700 help-board-dirs := $(addprefix help-,$(board-dirs))
1701
1702 help-boards: $(help-board-dirs)
1703
1704 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1705
1706 $(help-board-dirs): help-%:
1707 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1708 @$(if $(boards-per-dir), \
1709 $(foreach b, $(boards-per-dir), \
1710 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1711 echo '')
1712
1713
1714 # Documentation targets
1715 # ---------------------------------------------------------------------------
1716 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1717 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1718 PHONY += $(DOC_TARGETS)
1719 $(DOC_TARGETS):
1720 $(Q)$(MAKE) $(build)=Documentation $@
1721
1722
1723 # Rust targets
1724 # ---------------------------------------------------------------------------
1725
1726 # "Is Rust available?" target
1727 PHONY += rustavailable
1728 rustavailable:
1729 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1730
1731 # Documentation target
1732 #
1733 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1734 PHONY += rustdoc
1735 rustdoc: prepare
1736 $(Q)$(MAKE) $(build)=rust $@
1737
1738 # Testing target
1739 PHONY += rusttest
1740 rusttest: prepare
1741 $(Q)$(MAKE) $(build)=rust $@
1742
1743 # Formatting targets
1744 PHONY += rustfmt rustfmtcheck
1745
1746 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1747 #
1748 # We match using absolute paths since `find` does not resolve them
1749 # when matching, which is a problem when e.g. `srctree` is `..`.
1750 # We `grep` afterwards in order to remove the directory entry itself.
1751 rustfmt:
1752 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1753 -o -path $(abs_srctree)/rust/alloc -prune \
1754 -o -path $(abs_objtree)/rust/test -prune \
1755 | grep -Fv $(abs_srctree)/rust/alloc \
1756 | grep -Fv $(abs_objtree)/rust/test \
1757 | grep -Fv generated \
1758 | xargs $(RUSTFMT) $(rustfmt_flags)
1759
1760 rustfmtcheck: rustfmt_flags = --check
1761 rustfmtcheck: rustfmt
1762
1763 # Misc
1764 # ---------------------------------------------------------------------------
1765
1766 PHONY += misc-check
1767 misc-check:
1768 $(Q)$(srctree)/scripts/misc-check
1769
1770 all: misc-check
1771
1772 PHONY += scripts_gdb
1773 scripts_gdb: prepare0
1774 $(Q)$(MAKE) $(build)=scripts/gdb
1775 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1776
1777 ifdef CONFIG_GDB_SCRIPTS
1778 all: scripts_gdb
1779 endif
1780
1781 else # KBUILD_EXTMOD
1782
1783 filechk_kernel.release = echo $(KERNELRELEASE)
1784
1785 ###
1786 # External module support.
1787 # When building external modules the kernel used as basis is considered
1788 # read-only, and no consistency checks are made and the make
1789 # system is not used on the basis kernel. If updates are required
1790 # in the basis kernel ordinary make commands (without M=...) must be used.
1791
1792 # We are always building only modules.
1793 KBUILD_BUILTIN :=
1794 KBUILD_MODULES := 1
1795
1796 build-dir := $(KBUILD_EXTMOD)
1797
1798 compile_commands.json: $(extmod_prefix)compile_commands.json
1799 PHONY += compile_commands.json
1800
1801 clean-dirs := $(KBUILD_EXTMOD)
1802 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1803 $(KBUILD_EXTMOD)/compile_commands.json
1804
1805 PHONY += prepare
1806 # now expand this into a simple variable to reduce the cost of shell evaluations
1807 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1808 prepare:
1809 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1810 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1811 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1812 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1813 fi
1814
1815 PHONY += help
1816 help:
1817 @echo ' Building external modules.'
1818 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1819 @echo ''
1820 @echo ' modules - default target, build the module(s)'
1821 @echo ' modules_install - install the module'
1822 @echo ' clean - remove generated files in module directory only'
1823 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1824 @echo ''
1825
1826 ifndef CONFIG_MODULES
1827 modules modules_install: __external_modules_error
1828 __external_modules_error:
1829 @echo >&2 '***'
1830 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1831 @echo >&2 '*** You cannot build or install external modules.'
1832 @echo >&2 '***'
1833 @false
1834 endif
1835
1836 endif # KBUILD_EXTMOD
1837
1838 # ---------------------------------------------------------------------------
1839 # Modules
1840
1841 PHONY += modules modules_install modules_sign modules_prepare
1842
1843 modules_install:
1844 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1845 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1846
1847 ifeq ($(CONFIG_MODULE_SIG),y)
1848 # modules_sign is a subset of modules_install.
1849 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1850 modules_sign: modules_install
1851 @:
1852 else
1853 modules_sign:
1854 @echo >&2 '***'
1855 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1856 @echo >&2 '***'
1857 @false
1858 endif
1859
1860 ifdef CONFIG_MODULES
1861
1862 $(MODORDER): $(build-dir)
1863 @:
1864
1865 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1866 # This is solely useful to speed up test compiles.
1867 modules: modpost
1868 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1869 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1870 endif
1871
1872 PHONY += modules_check
1873 modules_check: $(MODORDER)
1874 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1875
1876 else # CONFIG_MODULES
1877
1878 modules:
1879 @:
1880
1881 KBUILD_MODULES :=
1882
1883 endif # CONFIG_MODULES
1884
1885 PHONY += modpost
1886 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1887 $(if $(KBUILD_MODULES), modules_check)
1888 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1889
1890 # Single targets
1891 # ---------------------------------------------------------------------------
1892 # To build individual files in subdirectories, you can do like this:
1893 #
1894 # make foo/bar/baz.s
1895 #
1896 # The supported suffixes for single-target are listed in 'single-targets'
1897 #
1898 # To build only under specific subdirectories, you can do like this:
1899 #
1900 # make foo/bar/baz/
1901
1902 ifdef single-build
1903
1904 # .ko is special because modpost is needed
1905 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1906 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1907 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1908
1909 $(single-ko): single_modules
1910 @:
1911 $(single-no-ko): $(build-dir)
1912 @:
1913
1914 # Remove MODORDER when done because it is not the real one.
1915 PHONY += single_modules
1916 single_modules: $(single-no-ko) modules_prepare
1917 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1918 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1919 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1920 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1921 endif
1922 $(Q)rm -f $(MODORDER)
1923
1924 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1925
1926 KBUILD_MODULES := 1
1927
1928 endif
1929
1930 # Preset locale variables to speed up the build process. Limit locale
1931 # tweaks to this spot to avoid wrong language settings when running
1932 # make menuconfig etc.
1933 # Error messages still appears in the original language
1934 PHONY += $(build-dir)
1935 $(build-dir): prepare
1936 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1937
1938 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1939 PHONY += $(clean-dirs) clean
1940 $(clean-dirs):
1941 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1942
1943 clean: $(clean-dirs)
1944 $(call cmd,rmfiles)
1945 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1946 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1947 -o -name '*.ko.*' \
1948 -o -name '*.dtb' -o -name '*.dtbo' \
1949 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1950 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1951 -o -name '*.dwo' -o -name '*.lst' \
1952 -o -name '*.su' -o -name '*.mod' \
1953 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1954 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1955 -o -name '*.asn1.[ch]' \
1956 -o -name '*.symtypes' -o -name 'modules.order' \
1957 -o -name '*.c.[012]*.*' \
1958 -o -name '*.ll' \
1959 -o -name '*.gcno' \
1960 \) -type f -print \
1961 -o -name '.tmp_*' -print \
1962 | xargs rm -rf
1963
1964 # Generate tags for editors
1965 # ---------------------------------------------------------------------------
1966 quiet_cmd_tags = GEN $@
1967 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1968
1969 tags TAGS cscope gtags: FORCE
1970 $(call cmd,tags)
1971
1972 # Generate rust-project.json (a file that describes the structure of non-Cargo
1973 # Rust projects) for rust-analyzer (an implementation of the Language Server
1974 # Protocol).
1975 PHONY += rust-analyzer
1976 rust-analyzer:
1977 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1978 $(Q)$(MAKE) $(build)=rust $@
1979
1980 # Script to generate missing namespace dependencies
1981 # ---------------------------------------------------------------------------
1982
1983 PHONY += nsdeps
1984 nsdeps: export KBUILD_NSDEPS=1
1985 nsdeps: modules
1986 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1987
1988 # Clang Tooling
1989 # ---------------------------------------------------------------------------
1990
1991 quiet_cmd_gen_compile_commands = GEN $@
1992 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1993
1994 $(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
1995 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1996 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1997 $(call if_changed,gen_compile_commands)
1998
1999 targets += $(extmod_prefix)compile_commands.json
2000
2001 PHONY += clang-tidy clang-analyzer
2002
2003 ifdef CONFIG_CC_IS_CLANG
2004 quiet_cmd_clang_tools = CHECK $<
2005 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2006
2007 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2008 $(call cmd,clang_tools)
2009 else
2010 clang-tidy clang-analyzer:
2011 @echo "$@ requires CC=clang" >&2
2012 @false
2013 endif
2014
2015 # Scripts to check various things for consistency
2016 # ---------------------------------------------------------------------------
2017
2018 PHONY += includecheck versioncheck coccicheck export_report
2019
2020 includecheck:
2021 find $(srctree)/* $(RCS_FIND_IGNORE) \
2022 -name '*.[hcS]' -type f -print | sort \
2023 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2024
2025 versioncheck:
2026 find $(srctree)/* $(RCS_FIND_IGNORE) \
2027 -name '*.[hcS]' -type f -print | sort \
2028 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2029
2030 coccicheck:
2031 $(Q)$(BASH) $(srctree)/scripts/$@
2032
2033 export_report:
2034 $(PERL) $(srctree)/scripts/export_report.pl
2035
2036 PHONY += checkstack kernelrelease kernelversion image_name
2037
2038 # UML needs a little special treatment here. It wants to use the host
2039 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2040 # else wants $(ARCH), including people doing cross-builds, which means
2041 # that $(SUBARCH) doesn't work here.
2042 ifeq ($(ARCH), um)
2043 CHECKSTACK_ARCH := $(SUBARCH)
2044 else
2045 CHECKSTACK_ARCH := $(ARCH)
2046 endif
2047 MINSTACKSIZE ?= 100
2048 checkstack:
2049 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2050 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2051
2052 kernelrelease:
2053 @$(filechk_kernel.release)
2054
2055 kernelversion:
2056 @echo $(KERNELVERSION)
2057
2058 image_name:
2059 @echo $(KBUILD_IMAGE)
2060
2061 PHONY += run-command
2062 run-command:
2063 $(Q)$(KBUILD_RUN_COMMAND)
2064
2065 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2066 cmd_rmfiles = rm -rf $(rm-files)
2067
2068 # read saved command lines for existing targets
2069 existing-targets := $(wildcard $(sort $(targets)))
2070
2071 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2072
2073 endif # config-build
2074 endif # mixed-build
2075 endif # need-sub-make
2076
2077 PHONY += FORCE
2078 FORCE:
2079
2080 # Declare the contents of the PHONY variable as phony. We keep that
2081 # information in a variable so we can use it in if_changed and friends.
2082 .PHONY: $(PHONY)
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