1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # General architecture dependent options
4 #
5
6 #
7 # Note: arch/$(SRCARCH)/Kconfig needs to be in
8 # override the default values in this file.
9 #
10 source "arch/$(SRCARCH)/Kconfig"
11
12 config ARCH_CONFIGURES_CPU_MITIGATIONS
13 bool
14
15 if !ARCH_CONFIGURES_CPU_MITIGATIONS
16 config CPU_MITIGATIONS
17 def_bool y
18 endif
19
20 #
21 # Selected by architectures that need custom D
22 # IOMMUs not handled by dma-iommu. Drivers mu
23 #
24 config ARCH_HAS_DMA_OPS
25 depends on HAS_DMA
26 select DMA_OPS_HELPERS
27 bool
28
29 menu "General architecture-dependent options"
30
31 config ARCH_HAS_SUBPAGE_FAULTS
32 bool
33 help
34 Select if the architecture can check
35 granularity (e.g. arm64 MTE). The pr
36 must be implemented.
37
38 config HOTPLUG_SMT
39 bool
40
41 config SMT_NUM_THREADS_DYNAMIC
42 bool
43
44 # Selected by HOTPLUG_CORE_SYNC_DEAD or HOTPLU
45 config HOTPLUG_CORE_SYNC
46 bool
47
48 # Basic CPU dead synchronization selected by a
49 config HOTPLUG_CORE_SYNC_DEAD
50 bool
51 select HOTPLUG_CORE_SYNC
52
53 # Full CPU synchronization with alive state se
54 config HOTPLUG_CORE_SYNC_FULL
55 bool
56 select HOTPLUG_CORE_SYNC_DEAD if HOTPL
57 select HOTPLUG_CORE_SYNC
58
59 config HOTPLUG_SPLIT_STARTUP
60 bool
61 select HOTPLUG_CORE_SYNC_FULL
62
63 config HOTPLUG_PARALLEL
64 bool
65 select HOTPLUG_SPLIT_STARTUP
66
67 config GENERIC_ENTRY
68 bool
69
70 config KPROBES
71 bool "Kprobes"
72 depends on HAVE_KPROBES
73 select KALLSYMS
74 select EXECMEM
75 select NEED_TASKS_RCU
76 help
77 Kprobes allows you to trap at almost
78 execute a callback function. regist
79 a probepoint and specifies the callb
80 for kernel debugging, non-intrusive
81 If in doubt, say "N".
82
83 config JUMP_LABEL
84 bool "Optimize very unlikely/likely br
85 depends on HAVE_ARCH_JUMP_LABEL
86 select OBJTOOL if HAVE_JUMP_LABEL_HACK
87 help
88 This option enables a transparent br
89 makes certain almost-always-true or
90 conditions even cheaper to execute w
91
92 Certain performance-sensitive kernel
93 scheduler functionality, networking
94 branches and include support for thi
95
96 If it is detected that the compiler
97 the kernel will compile such branche
98 instruction. When the condition flag
99 nop will be converted to a jump inst
100 conditional block of instructions.
101
102 This technique lowers overhead and s
103 of the processor and generally makes
104 of the condition is slower, but thos
105
106 ( On 32-bit x86, the necessary optio
107 flags may increase the size of the
108
109 config STATIC_KEYS_SELFTEST
110 bool "Static key selftest"
111 depends on JUMP_LABEL
112 help
113 Boot time self-test of the branch pa
114
115 config STATIC_CALL_SELFTEST
116 bool "Static call selftest"
117 depends on HAVE_STATIC_CALL
118 help
119 Boot time self-test of the call patc
120
121 config OPTPROBES
122 def_bool y
123 depends on KPROBES && HAVE_OPTPROBES
124 select NEED_TASKS_RCU
125
126 config KPROBES_ON_FTRACE
127 def_bool y
128 depends on KPROBES && HAVE_KPROBES_ON_
129 depends on DYNAMIC_FTRACE_WITH_REGS
130 help
131 If function tracer is enabled and th
132 passing of pt_regs to function traci
133 optimize on top of function tracing.
134
135 config UPROBES
136 def_bool n
137 depends on ARCH_SUPPORTS_UPROBES
138 help
139 Uprobes is the user-space counterpar
140 enable instrumentation applications
141 to establish unintrusive probes in u
142 libraries, by executing handler func
143 are hit by user-space applications.
144
145 ( These probes come in the form of s
146 managed by the kernel and kept tra
147 application. )
148
149 config HAVE_64BIT_ALIGNED_ACCESS
150 def_bool 64BIT && !HAVE_EFFICIENT_UNAL
151 help
152 Some architectures require 64 bit ac
153 aligned, which also requires structs
154 to be 64 bit aligned too. This inclu
155 architectures which can do 64 bit ac
156 architectures without unaligned acce
157
158 This symbol should be selected by an
159 accesses are required to be 64 bit a
160 though it is not a 64 bit architectu
161
162 See Documentation/core-api/unaligned
163 more information on the topic of una
164
165 config HAVE_EFFICIENT_UNALIGNED_ACCESS
166 bool
167 help
168 Some architectures are unable to per
169 without the use of get_unaligned/put
170 unable to perform such accesses effi
171 unaligned access and require fixing
172 handler.)
173
174 This symbol should be selected by an
175 perform unaligned accesses efficient
176 code paths to be selected for these
177 drivers, for example, could opt to n
178 problems with received packets if do
179 much.
180
181 See Documentation/core-api/unaligned
182 information on the topic of unaligne
183
184 config ARCH_USE_BUILTIN_BSWAP
185 bool
186 help
187 Modern versions of GCC (since 4.4) h
188 for handling byte-swapping. Using th
189 inline assembler that the architectu
190 __arch_bswapXX() macros, allows the
191 happening and offers more opportunit
192 particular, the compiler will be abl
193 with a nearby load or store and use
194 store-and-swap instructions if the a
195 should almost *never* result in code
196 hand-coded assembler in <asm/swab.h>
197 does, the use of the builtins is opt
198
199 Any architecture with load-and-swap
200 instructions should set this. And it
201 on architectures that don't have suc
202
203 config KRETPROBES
204 def_bool y
205 depends on KPROBES && (HAVE_KRETPROBES
206
207 config KRETPROBE_ON_RETHOOK
208 def_bool y
209 depends on HAVE_RETHOOK
210 depends on KRETPROBES
211 select RETHOOK
212
213 config USER_RETURN_NOTIFIER
214 bool
215 depends on HAVE_USER_RETURN_NOTIFIER
216 help
217 Provide a kernel-internal notificati
218 switch to user mode.
219
220 config HAVE_IOREMAP_PROT
221 bool
222
223 config HAVE_KPROBES
224 bool
225
226 config HAVE_KRETPROBES
227 bool
228
229 config HAVE_OPTPROBES
230 bool
231
232 config HAVE_KPROBES_ON_FTRACE
233 bool
234
235 config ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
236 bool
237 help
238 Since kretprobes modifies return add
239 stacktrace may see the kretprobe tra
240 of correct one. If the architecture
241 unwinder can adjust such entries, se
242
243 config HAVE_FUNCTION_ERROR_INJECTION
244 bool
245
246 config HAVE_NMI
247 bool
248
249 config HAVE_FUNCTION_DESCRIPTORS
250 bool
251
252 config TRACE_IRQFLAGS_SUPPORT
253 bool
254
255 config TRACE_IRQFLAGS_NMI_SUPPORT
256 bool
257
258 #
259 # An arch should select this if it provides al
260 #
261 # task_pt_regs() in asm/process
262 # arch_has_single_step() if there is ha
263 # arch_has_block_step() if there is ha
264 # asm/syscall.h supplying asm-
265 # linux/regset.h user_regset in
266 # CORE_DUMP_USE_REGSET #define'd in l
267 # TIF_SYSCALL_TRACE calls ptrace_r
268 # TIF_NOTIFY_RESUME calls resume_u
269 #
270 config HAVE_ARCH_TRACEHOOK
271 bool
272
273 config HAVE_DMA_CONTIGUOUS
274 bool
275
276 config GENERIC_SMP_IDLE_THREAD
277 bool
278
279 config GENERIC_IDLE_POLL_SETUP
280 bool
281
282 config ARCH_HAS_FORTIFY_SOURCE
283 bool
284 help
285 An architecture should select this w
286 build and run with CONFIG_FORTIFY_SO
287
288 #
289 # Select if the arch provides a historic keepi
290 # command line option
291 #
292 config ARCH_HAS_KEEPINITRD
293 bool
294
295 # Select if arch has all set_memory_ro/rw/x/nx
296 config ARCH_HAS_SET_MEMORY
297 bool
298
299 # Select if arch has all set_direct_map_invali
300 config ARCH_HAS_SET_DIRECT_MAP
301 bool
302
303 #
304 # Select if the architecture provides the arch
305 # either provide an uncached segment alias for
306 # to remap the page tables in place.
307 #
308 config ARCH_HAS_DMA_SET_UNCACHED
309 bool
310
311 #
312 # Select if the architectures provides the arc
313 # to undo an in-place page table remap for unc
314 #
315 config ARCH_HAS_DMA_CLEAR_UNCACHED
316 bool
317
318 config ARCH_HAS_CPU_FINALIZE_INIT
319 bool
320
321 # The architecture has a per-task state that i
322 config ARCH_HAS_CPU_PASID
323 bool
324 select IOMMU_MM_DATA
325
326 config HAVE_ARCH_THREAD_STRUCT_WHITELIST
327 bool
328 help
329 An architecture should select this t
330 knowledge about what region of the t
331 whitelisted for copying to userspace
332 FPU registers. Specifically, arch_th
333 should be implemented. Without this,
334 field in task_struct will be left wh
335
336 # Select if arch wants to size task_struct dyn
337 config ARCH_WANTS_DYNAMIC_TASK_STRUCT
338 bool
339
340 config ARCH_WANTS_NO_INSTR
341 bool
342 help
343 An architecture should select this i
344 functions to denote that the toolcha
345 functions and is required for correc
346
347 config ARCH_32BIT_OFF_T
348 bool
349 depends on !64BIT
350 help
351 All new 32-bit architectures should
352 userspace side which corresponds to
353 is the requirement for modern ABIs.
354 still support 32-bit off_t. This opt
355 architectures explicitly.
356
357 # Selected by 64 bit architectures which have
358 config ARCH_32BIT_USTAT_F_TINODE
359 bool
360
361 config HAVE_ASM_MODVERSIONS
362 bool
363 help
364 This symbol should be selected by an
365 <asm/asm-prototypes.h> to support th
366 exported from assembly code.
367
368 config HAVE_REGS_AND_STACK_ACCESS_API
369 bool
370 help
371 This symbol should be selected by an
372 the API needed to access registers a
373 declared in asm/ptrace.h
374 For example the kprobes-based event
375
376 config HAVE_RSEQ
377 bool
378 depends on HAVE_REGS_AND_STACK_ACCESS_
379 help
380 This symbol should be selected by an
381 supports an implementation of restar
382
383 config HAVE_RUST
384 bool
385 help
386 This symbol should be selected by an
387 supports Rust.
388
389 config HAVE_FUNCTION_ARG_ACCESS_API
390 bool
391 help
392 This symbol should be selected by an
393 the API needed to access function ar
394 declared in asm/ptrace.h
395
396 config HAVE_HW_BREAKPOINT
397 bool
398 depends on PERF_EVENTS
399
400 config HAVE_MIXED_BREAKPOINTS_REGS
401 bool
402 depends on HAVE_HW_BREAKPOINT
403 help
404 Depending on the arch implementation
405 some of them have separate registers
406 breakpoints addresses, others have m
407 them but define the access type in a
408 Select this option if your arch impl
409 latter fashion.
410
411 config HAVE_USER_RETURN_NOTIFIER
412 bool
413
414 config HAVE_PERF_EVENTS_NMI
415 bool
416 help
417 System hardware can generate an NMI
418 subsystem. Also has support for cal
419 to determine how many clock cycles i
420
421 config HAVE_HARDLOCKUP_DETECTOR_PERF
422 bool
423 depends on HAVE_PERF_EVENTS_NMI
424 help
425 The arch chooses to use the generic
426 detector. Must define HAVE_PERF_EVEN
427
428 config HAVE_HARDLOCKUP_DETECTOR_ARCH
429 bool
430 help
431 The arch provides its own hardlockup
432 of the generic ones.
433
434 It uses the same command line parame
435 as the generic hardlockup detectors.
436
437 config HAVE_PERF_REGS
438 bool
439 help
440 Support selective register dumps for
441 bit-mapping of each registers and a
442
443 config HAVE_PERF_USER_STACK_DUMP
444 bool
445 help
446 Support user stack dumps for perf ev
447 access to the user stack pointer whi
448 architectures.
449
450 config HAVE_ARCH_JUMP_LABEL
451 bool
452
453 config HAVE_ARCH_JUMP_LABEL_RELATIVE
454 bool
455
456 config MMU_GATHER_TABLE_FREE
457 bool
458
459 config MMU_GATHER_RCU_TABLE_FREE
460 bool
461 select MMU_GATHER_TABLE_FREE
462
463 config MMU_GATHER_PAGE_SIZE
464 bool
465
466 config MMU_GATHER_NO_RANGE
467 bool
468 select MMU_GATHER_MERGE_VMAS
469
470 config MMU_GATHER_NO_FLUSH_CACHE
471 bool
472
473 config MMU_GATHER_MERGE_VMAS
474 bool
475
476 config MMU_GATHER_NO_GATHER
477 bool
478 depends on MMU_GATHER_TABLE_FREE
479
480 config ARCH_WANT_IRQS_OFF_ACTIVATE_MM
481 bool
482 help
483 Temporary select until all architect
484 irqs disabled over activate_mm. Arch
485 shootdowns should enable this.
486
487 # Use normal mm refcounting for MMU_LAZY_TLB k
488 # MMU_LAZY_TLB_REFCOUNT=n can improve the scal
489 # to/from kernel threads when the same mm is r
490 # multi-threaded application), by reducing con
491 #
492 # This can be disabled if the architecture ens
493 # "lazy tlb" beyond its final refcount (i.e.,
494 # or its kernel page tables). This could be ar
495 # final exit(2) TLB flush, for example.
496 #
497 # To implement this, an arch *must*:
498 # Ensure the _lazy_tlb variants of mmgrab/mmdr
499 # the lazy tlb reference of a kthread's ->acti
500 # converted already).
501 config MMU_LAZY_TLB_REFCOUNT
502 def_bool y
503 depends on !MMU_LAZY_TLB_SHOOTDOWN
504
505 # This option allows MMU_LAZY_TLB_REFCOUNT=n.
506 # mm as a lazy tlb beyond its last reference c
507 # users before the mm is deallocated. __mmdrop
508 # be using the mm as a lazy tlb, so that they
509 # init_mm for their active mm. mm_cpumask(mm)
510 # may be using mm as a lazy tlb mm.
511 #
512 # To implement this, an arch *must*:
513 # - At the time of the final mmdrop of the mm,
514 # at least all possible CPUs in which the mm
515 # - It must meet the requirements for MMU_LAZY
516 config MMU_LAZY_TLB_SHOOTDOWN
517 bool
518
519 config ARCH_HAVE_NMI_SAFE_CMPXCHG
520 bool
521
522 config ARCH_HAVE_EXTRA_ELF_NOTES
523 bool
524 help
525 An architecture should select this i
526 arch-specific ELF note section to co
527 functions: elf_coredump_extra_notes_
528 elf_coredump_extra_notes_write() whi
529 dumper.
530
531 config ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
532 bool
533
534 config HAVE_ALIGNED_STRUCT_PAGE
535 bool
536 help
537 This makes sure that struct pages ar
538 e.g. the SLUB allocator can perform
539 on a struct page for better performa
540 might increase the size of a struct
541
542 config HAVE_CMPXCHG_LOCAL
543 bool
544
545 config HAVE_CMPXCHG_DOUBLE
546 bool
547
548 config ARCH_WEAK_RELEASE_ACQUIRE
549 bool
550
551 config ARCH_WANT_IPC_PARSE_VERSION
552 bool
553
554 config ARCH_WANT_COMPAT_IPC_PARSE_VERSION
555 bool
556
557 config ARCH_WANT_OLD_COMPAT_IPC
558 select ARCH_WANT_COMPAT_IPC_PARSE_VERS
559 bool
560
561 config HAVE_ARCH_SECCOMP
562 bool
563 help
564 An arch should select this symbol to
565 syscall policy), and must provide an
566 and compat syscalls if the asm-gener
567 - __NR_seccomp_read_32
568 - __NR_seccomp_write_32
569 - __NR_seccomp_exit_32
570 - __NR_seccomp_sigreturn_32
571
572 config HAVE_ARCH_SECCOMP_FILTER
573 bool
574 select HAVE_ARCH_SECCOMP
575 help
576 An arch should select this symbol if
577 - all the requirements for HAVE_ARCH
578 - syscall_get_arch()
579 - syscall_get_arguments()
580 - syscall_rollback()
581 - syscall_set_return_value()
582 - SIGSYS siginfo_t support
583 - secure_computing is called from a
584 - secure_computing return value is c
585 results in the system call being s
586 - seccomp syscall wired up
587 - if !HAVE_SPARSE_SYSCALL_NR, have S
588 SECCOMP_ARCH_NATIVE_NR, SECCOMP_AR
589 COMPAT is supported, have the SECC
590
591 config SECCOMP
592 prompt "Enable seccomp to safely execu
593 def_bool y
594 depends on HAVE_ARCH_SECCOMP
595 help
596 This kernel feature is useful for nu
597 that may need to handle untrusted by
598 execution. By using pipes or other t
599 to the process as file descriptors s
600 syscalls, it's possible to isolate t
601 own address space using seccomp. Onc
602 prctl(PR_SET_SECCOMP) or the seccomp
603 disabled and the task is only allowe
604 syscalls defined by each seccomp mod
605
606 If unsure, say Y.
607
608 config SECCOMP_FILTER
609 def_bool y
610 depends on HAVE_ARCH_SECCOMP_FILTER &&
611 help
612 Enable tasks to build secure computi
613 in terms of Berkeley Packet Filter p
614 task-defined system call filtering p
615
616 See Documentation/userspace-api/secc
617
618 config SECCOMP_CACHE_DEBUG
619 bool "Show seccomp filter cache status
620 depends on SECCOMP_FILTER && !HAVE_SPA
621 depends on PROC_FS
622 help
623 This enables the /proc/pid/seccomp_c
624 seccomp cache data. The file format
625 the file requires CAP_SYS_ADMIN.
626
627 This option is for debugging only. E
628 an adversary may be able to infer th
629
630 If unsure, say N.
631
632 config HAVE_ARCH_STACKLEAK
633 bool
634 help
635 An architecture should select this i
636 fills the used part of the kernel st
637 value before returning from system c
638
639 config HAVE_STACKPROTECTOR
640 bool
641 help
642 An arch should select this symbol if
643 - it has implemented a stack canary
644
645 config STACKPROTECTOR
646 bool "Stack Protector buffer overflow
647 depends on HAVE_STACKPROTECTOR
648 depends on $(cc-option,-fstack-protect
649 default y
650 help
651 This option turns on the "stack-prot
652 feature puts, at the beginning of fu
653 the stack just before the return add
654 the value just before actually retur
655 overflows (that need to overwrite th
656 overwrite the canary, which gets det
657 neutralized via a kernel panic.
658
659 Functions will have the stack-protec
660 have an 8-byte or larger character a
661
662 This feature requires gcc version 4.
663 gcc with the feature backported ("-f
664
665 On an x86 "defconfig" build, this fe
666 about 3% of all kernel functions, wh
667 by about 0.3%.
668
669 config STACKPROTECTOR_STRONG
670 bool "Strong Stack Protector"
671 depends on STACKPROTECTOR
672 depends on $(cc-option,-fstack-protect
673 default y
674 help
675 Functions will have the stack-protec
676 of the following conditions:
677
678 - local variable's address used as p
679 assignment or function argument
680 - local variable is an array (or uni
681 regardless of array type or length
682 - uses register local variables
683
684 This feature requires gcc version 4.
685 gcc with the feature backported ("-f
686
687 On an x86 "defconfig" build, this fe
688 about 20% of all kernel functions, w
689 size by about 2%.
690
691 config ARCH_SUPPORTS_SHADOW_CALL_STACK
692 bool
693 help
694 An architecture should select this i
695 Shadow Call Stack and implements run
696 switching.
697
698 config SHADOW_CALL_STACK
699 bool "Shadow Call Stack"
700 depends on ARCH_SUPPORTS_SHADOW_CALL_S
701 depends on DYNAMIC_FTRACE_WITH_ARGS ||
702 depends on MMU
703 help
704 This option enables the compiler's S
705 uses a shadow stack to protect funct
706 being overwritten by an attacker. Mo
707 in the compiler's documentation:
708
709 - Clang: https://clang.llvm.org/docs
710 - GCC: https://gcc.gnu.org/onlinedoc
711
712 Note that security guarantees in the
713 ones documented for user space. The
714 of shadow stacks in memory, which me
715 reading and writing arbitrary memory
716 and hijack control flow by modifying
717
718 config DYNAMIC_SCS
719 bool
720 help
721 Set by the arch code if it relies on
722 shadow call stack push and pop instr
723 compiler.
724
725 config LTO
726 bool
727 help
728 Selected if the kernel will be built
729
730 config LTO_CLANG
731 bool
732 select LTO
733 help
734 Selected if the kernel will be built
735
736 config ARCH_SUPPORTS_LTO_CLANG
737 bool
738 help
739 An architecture should select this o
740 - compiling with Clang,
741 - compiling inline assembly with Cla
742 - and linking with LLD.
743
744 config ARCH_SUPPORTS_LTO_CLANG_THIN
745 bool
746 help
747 An architecture should select this o
748 ThinLTO mode.
749
750 config HAS_LTO_CLANG
751 def_bool y
752 depends on CC_IS_CLANG && LD_IS_LLD &&
753 depends on $(success,$(NM) --help | he
754 depends on $(success,$(AR) --help | he
755 depends on ARCH_SUPPORTS_LTO_CLANG
756 depends on !FTRACE_MCOUNT_USE_RECORDMC
757 # https://github.com/ClangBuiltLinux/l
758 depends on (!KASAN || KASAN_HW_TAGS ||
759 depends on (!KCOV || CLANG_VERSION >=
760 depends on !GCOV_KERNEL
761 help
762 The compiler and Kconfig options sup
763 LTO.
764
765 choice
766 prompt "Link Time Optimization (LTO)"
767 default LTO_NONE
768 help
769 This option enables Link Time Optimi
770 compiler to optimize binaries global
771
772 If unsure, select LTO_NONE. Note tha
773 so it's disabled by default.
774
775 config LTO_NONE
776 bool "None"
777 help
778 Build the kernel normally, without L
779
780 config LTO_CLANG_FULL
781 bool "Clang Full LTO (EXPERIMENTAL)"
782 depends on HAS_LTO_CLANG
783 depends on !COMPILE_TEST
784 select LTO_CLANG
785 help
786 This option enables Clang's full Lin
787 allows the compiler to optimize the
788 this option, the compiler generates
789 object files, and the actual compila
790 the LTO link step, which may take se
791 kernel configuration. More informati
792 documentation:
793
794 https://llvm.org/docs/LinkTimeOpti
795
796 During link time, this option can us
797 may take much longer than the ThinLT
798
799 config LTO_CLANG_THIN
800 bool "Clang ThinLTO (EXPERIMENTAL)"
801 depends on HAS_LTO_CLANG && ARCH_SUPPO
802 select LTO_CLANG
803 help
804 This option enables Clang's ThinLTO,
805 optimization and faster incremental
806 CONFIG_LTO_CLANG_FULL option. More i
807 from Clang's documentation:
808
809 https://clang.llvm.org/docs/ThinLT
810
811 If unsure, say Y.
812 endchoice
813
814 config ARCH_SUPPORTS_CFI_CLANG
815 bool
816 help
817 An architecture should select this o
818 Control-Flow Integrity (CFI) checkin
819
820 config ARCH_USES_CFI_TRAPS
821 bool
822
823 config CFI_CLANG
824 bool "Use Clang's Control Flow Integri
825 depends on ARCH_SUPPORTS_CFI_CLANG
826 depends on $(cc-option,-fsanitize=kcfi
827 help
828 This option enables Clang's forward-
829 (CFI) checking, where the compiler i
830 indirect function call to ensure the
831 the correct static type. This restri
832 makes it more difficult for an attac
833 the modification of stored function
834 found from Clang's documentation:
835
836 https://clang.llvm.org/docs/Contro
837
838 config CFI_ICALL_NORMALIZE_INTEGERS
839 bool "Normalize CFI tags for integers"
840 depends on CFI_CLANG
841 depends on HAVE_CFI_ICALL_NORMALIZE_IN
842 help
843 This option normalizes the CFI tags
844 integer types of the same size and s
845 tag.
846
847 The option is separate from CONFIG_R
848 When working with build systems that
849 convenient to be able to turn on thi
850 turned on.
851
852 This option is necessary for using C
853
854 config HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG
855 def_bool y
856 depends on $(cc-option,-fsanitize=kcfi
857 # With GCOV/KASAN we need this fix: ht
858 depends on CLANG_VERSION >= 190103 ||
859
860 config HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC
861 def_bool y
862 depends on HAVE_CFI_ICALL_NORMALIZE_IN
863 depends on RUSTC_VERSION >= 107900
864 # With GCOV/KASAN we need this fix: ht
865 depends on (RUSTC_LLVM_VERSION >= 1901
866 (!GCOV_KERNEL && !KASAN_GENERI
867
868 config CFI_PERMISSIVE
869 bool "Use CFI in permissive mode"
870 depends on CFI_CLANG
871 help
872 When selected, Control Flow Integrit
873 warning instead of a kernel panic. T
874 for finding indirect call type misma
875
876 If unsure, say N.
877
878 config HAVE_ARCH_WITHIN_STACK_FRAMES
879 bool
880 help
881 An architecture should select this i
882 frames to determine if an object is
883 or local variables (i.e. that it exc
884 and similar) by implementing an inli
885 which is used by CONFIG_HARDENED_USE
886
887 config HAVE_CONTEXT_TRACKING_USER
888 bool
889 help
890 Provide kernel/user boundaries probe
891 that need it, such as userspace RCU
892 Syscalls need to be wrapped inside u
893 optimized behind static key or throu
894 flag. Exceptions handlers must be wr
895 protected inside ct_irq_enter/ct_irq
896 handling on irq exit still need to b
897
898 config HAVE_CONTEXT_TRACKING_USER_OFFSTACK
899 bool
900 help
901 Architecture neither relies on excep
902 nor on schedule_user(). Also preempt
903 preempt_schedule_irq() can't be call
904 while context tracking is CT_STATE_U
905 entry implementation where the follo
906 critical entry code, ie: before user
907
908 - Critical entry code isn't preempti
909 not interruptible).
910 - No use of RCU read side critical s
911 got called.
912 - No use of instrumentation, unless
913 called.
914
915 config HAVE_TIF_NOHZ
916 bool
917 help
918 Arch relies on TIF_NOHZ and syscall
919 tracking calls to user_enter()/user_
920
921 config HAVE_VIRT_CPU_ACCOUNTING
922 bool
923
924 config HAVE_VIRT_CPU_ACCOUNTING_IDLE
925 bool
926 help
927 Architecture has its own way to acco
928 doesn't implement vtime_account_idle
929
930 config ARCH_HAS_SCALED_CPUTIME
931 bool
932
933 config HAVE_VIRT_CPU_ACCOUNTING_GEN
934 bool
935 default y if 64BIT
936 help
937 With VIRT_CPU_ACCOUNTING_GEN, cputim
938 Before enabling this option, arch co
939 to ensure there are no races in conc
940 cputime_t. For example, reading/writ
941 some 32-bit arches may require multi
942 locking is needed to protect against
943
944 config HAVE_IRQ_TIME_ACCOUNTING
945 bool
946 help
947 Archs need to ensure they use a high
948 support irq time accounting and then
949
950 config HAVE_MOVE_PUD
951 bool
952 help
953 Architectures that select this are a
954 PUD level. If there are only 3 page
955 happens at the PGD level.
956
957 config HAVE_MOVE_PMD
958 bool
959 help
960 Archs that select this are able to m
961
962 config HAVE_ARCH_TRANSPARENT_HUGEPAGE
963 bool
964
965 config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
966 bool
967
968 config HAVE_ARCH_HUGE_VMAP
969 bool
970
971 #
972 # Archs that select this would be capable of
973 # arch_vmap_pmd_supported() returns true). Th
974 # must be used to enable allocations to use h
975 #
976 config HAVE_ARCH_HUGE_VMALLOC
977 depends on HAVE_ARCH_HUGE_VMAP
978 bool
979
980 config ARCH_WANT_HUGE_PMD_SHARE
981 bool
982
983 # Archs that want to use pmd_mkwrite on kernel
984 # if there are no userspace memory management
985 config ARCH_WANT_KERNEL_PMD_MKWRITE
986 bool
987
988 config ARCH_WANT_PMD_MKWRITE
989 def_bool TRANSPARENT_HUGEPAGE || ARCH_
990
991 config HAVE_ARCH_SOFT_DIRTY
992 bool
993
994 config HAVE_MOD_ARCH_SPECIFIC
995 bool
996 help
997 The arch uses struct mod_arch_specif
998 just need a simple module loader wit
999 should not enable this.
1000
1001 config MODULES_USE_ELF_RELA
1002 bool
1003 help
1004 Modules only use ELF RELA relocatio
1005 relocations will give an error.
1006
1007 config MODULES_USE_ELF_REL
1008 bool
1009 help
1010 Modules only use ELF REL relocation
1011 relocations will give an error.
1012
1013 config ARCH_WANTS_MODULES_DATA_IN_VMALLOC
1014 bool
1015 help
1016 For architectures like powerpc/32 w
1017 allocation and need to allocate mod
1018
1019 config ARCH_WANTS_EXECMEM_LATE
1020 bool
1021 help
1022 For architectures that do not alloc
1023 boot, but rather require its initia
1024 enough entropy for module space ran
1025 arm64.
1026
1027 config HAVE_IRQ_EXIT_ON_IRQ_STACK
1028 bool
1029 help
1030 Architecture doesn't only execute t
1031 but also irq_exit(). This way we ca
1032 stack instead of switching to a new
1033 in the end of an hardirq.
1034 This spares a stack switch and impr
1035 processing.
1036
1037 config HAVE_SOFTIRQ_ON_OWN_STACK
1038 bool
1039 help
1040 Architecture provides a function to
1041 separate stack.
1042
1043 config SOFTIRQ_ON_OWN_STACK
1044 def_bool HAVE_SOFTIRQ_ON_OWN_STACK &&
1045
1046 config ALTERNATE_USER_ADDRESS_SPACE
1047 bool
1048 help
1049 Architectures set this when the CPU
1050 spaces for kernel and user space po
1051 access_ok() check on a __user point
1052
1053 config PGTABLE_LEVELS
1054 int
1055 default 2
1056
1057 config ARCH_HAS_ELF_RANDOMIZE
1058 bool
1059 help
1060 An architecture supports choosing r
1061 stack, mmap, brk, and ET_DYN. Defin
1062 - arch_mmap_rnd()
1063 - arch_randomize_brk()
1064
1065 config HAVE_ARCH_MMAP_RND_BITS
1066 bool
1067 help
1068 An arch should select this symbol i
1069 number of bits for use in establish
1070 allocations, has MMU enabled and pr
1071 - ARCH_MMAP_RND_BITS_MIN
1072 - ARCH_MMAP_RND_BITS_MAX
1073
1074 config HAVE_EXIT_THREAD
1075 bool
1076 help
1077 An architecture implements exit_thr
1078
1079 config ARCH_MMAP_RND_BITS_MIN
1080 int
1081
1082 config ARCH_MMAP_RND_BITS_MAX
1083 int
1084
1085 config ARCH_MMAP_RND_BITS_DEFAULT
1086 int
1087
1088 config ARCH_MMAP_RND_BITS
1089 int "Number of bits to use for ASLR o
1090 range ARCH_MMAP_RND_BITS_MIN ARCH_MMA
1091 default ARCH_MMAP_RND_BITS_DEFAULT if
1092 default ARCH_MMAP_RND_BITS_MIN
1093 depends on HAVE_ARCH_MMAP_RND_BITS
1094 help
1095 This value can be used to select th
1096 determine the random offset to the
1097 resulting from mmap allocations. Th
1098 by the architecture's minimum and m
1099
1100 This value can be changed after boo
1101 /proc/sys/vm/mmap_rnd_bits tunable
1102
1103 config HAVE_ARCH_MMAP_RND_COMPAT_BITS
1104 bool
1105 help
1106 An arch should select this symbol i
1107 in compatibility mode, supports set
1108 use in establishing the base addres
1109 enabled and provides values for bot
1110 - ARCH_MMAP_RND_COMPAT_BITS_MIN
1111 - ARCH_MMAP_RND_COMPAT_BITS_MAX
1112
1113 config ARCH_MMAP_RND_COMPAT_BITS_MIN
1114 int
1115
1116 config ARCH_MMAP_RND_COMPAT_BITS_MAX
1117 int
1118
1119 config ARCH_MMAP_RND_COMPAT_BITS_DEFAULT
1120 int
1121
1122 config ARCH_MMAP_RND_COMPAT_BITS
1123 int "Number of bits to use for ASLR o
1124 range ARCH_MMAP_RND_COMPAT_BITS_MIN A
1125 default ARCH_MMAP_RND_COMPAT_BITS_DEF
1126 default ARCH_MMAP_RND_COMPAT_BITS_MIN
1127 depends on HAVE_ARCH_MMAP_RND_COMPAT_
1128 help
1129 This value can be used to select th
1130 determine the random offset to the
1131 resulting from mmap allocations for
1132 value will be bounded by the archit
1133 supported values.
1134
1135 This value can be changed after boo
1136 /proc/sys/vm/mmap_rnd_compat_bits t
1137
1138 config HAVE_ARCH_COMPAT_MMAP_BASES
1139 bool
1140 help
1141 This allows 64bit applications to i
1142 and vice-versa 32-bit applications
1143 Required for applications doing dif
1144
1145 config HAVE_PAGE_SIZE_4KB
1146 bool
1147
1148 config HAVE_PAGE_SIZE_8KB
1149 bool
1150
1151 config HAVE_PAGE_SIZE_16KB
1152 bool
1153
1154 config HAVE_PAGE_SIZE_32KB
1155 bool
1156
1157 config HAVE_PAGE_SIZE_64KB
1158 bool
1159
1160 config HAVE_PAGE_SIZE_256KB
1161 bool
1162
1163 choice
1164 prompt "MMU page size"
1165
1166 config PAGE_SIZE_4KB
1167 bool "4KiB pages"
1168 depends on HAVE_PAGE_SIZE_4KB
1169 help
1170 This option select the standard 4Ki
1171 available option on many architectu
1172 minimize memory consumption and is
1173 memory systems.
1174 Some software that is written for x
1175 assumptions about the page size and
1176
1177 config PAGE_SIZE_8KB
1178 bool "8KiB pages"
1179 depends on HAVE_PAGE_SIZE_8KB
1180 help
1181 This option is the only supported p
1182 processors, and can be slightly fas
1183
1184 config PAGE_SIZE_16KB
1185 bool "16KiB pages"
1186 depends on HAVE_PAGE_SIZE_16KB
1187 help
1188 This option is usually a good compr
1189 consumption and performance for typ
1190 workloads, often saving a level of
1191 to 4KB pages as well as reducing TL
1192 per-page operations in the kernel a
1193 page cache.
1194
1195 config PAGE_SIZE_32KB
1196 bool "32KiB pages"
1197 depends on HAVE_PAGE_SIZE_32KB
1198 help
1199 Using 32KiB page size will result i
1200 kernel at the price of higher memor
1201 16KiB pages. This option is availa
1202 Note that you will need a suitable
1203 support this.
1204
1205 config PAGE_SIZE_64KB
1206 bool "64KiB pages"
1207 depends on HAVE_PAGE_SIZE_64KB
1208 help
1209 Using 64KiB page size will result i
1210 kernel at the price of much higher
1211 4KiB or 16KiB pages.
1212 This is not suitable for general-pu
1213 better performance may be worth the
1214 supercomputing or database applicat
1215 large in-memory data rather than sm
1216
1217 config PAGE_SIZE_256KB
1218 bool "256KiB pages"
1219 depends on HAVE_PAGE_SIZE_256KB
1220 help
1221 256KiB pages have little practical
1222 memory usage. The kernel will only
1223 that have been compiled with '-zmax
1224 (the default is 64KiB or 4KiB on mo
1225
1226 endchoice
1227
1228 config PAGE_SIZE_LESS_THAN_64KB
1229 def_bool y
1230 depends on !PAGE_SIZE_64KB
1231 depends on PAGE_SIZE_LESS_THAN_256KB
1232
1233 config PAGE_SIZE_LESS_THAN_256KB
1234 def_bool y
1235 depends on !PAGE_SIZE_256KB
1236
1237 config PAGE_SHIFT
1238 int
1239 default 12 if PAGE_SIZE_4KB
1240 default 13 if PAGE_SIZE_8KB
1241 default 14 if PAGE_SIZE_16KB
1242 default 15 if PAGE_SIZE_32KB
1243 default 16 if PAGE_SIZE_64KB
1244 default 18 if PAGE_SIZE_256KB
1245
1246 # This allows to use a set of generic functio
1247 # address by giving priority to top-down sche
1248 # is not in legacy mode (compat task, unlimit
1249 # sysctl_legacy_va_layout).
1250 # Architecture that selects this option can p
1251 # - STACK_RND_MASK
1252 config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
1253 bool
1254 depends on MMU
1255 select ARCH_HAS_ELF_RANDOMIZE
1256
1257 config HAVE_OBJTOOL
1258 bool
1259
1260 config HAVE_JUMP_LABEL_HACK
1261 bool
1262
1263 config HAVE_NOINSTR_HACK
1264 bool
1265
1266 config HAVE_NOINSTR_VALIDATION
1267 bool
1268
1269 config HAVE_UACCESS_VALIDATION
1270 bool
1271 select OBJTOOL
1272
1273 config HAVE_STACK_VALIDATION
1274 bool
1275 help
1276 Architecture supports objtool compi
1277 validation.
1278
1279 config HAVE_RELIABLE_STACKTRACE
1280 bool
1281 help
1282 Architecture has either save_stack_
1283 arch_stack_walk_reliable() function
1284 if it can guarantee the trace is re
1285
1286 config HAVE_ARCH_HASH
1287 bool
1288 default n
1289 help
1290 If this is set, the architecture pr
1291 file which provides platform-specif
1292 functions in <linux/hash.h> or fs/n
1293
1294 config HAVE_ARCH_NVRAM_OPS
1295 bool
1296
1297 config ISA_BUS_API
1298 def_bool ISA
1299
1300 #
1301 # ABI hall of shame
1302 #
1303 config CLONE_BACKWARDS
1304 bool
1305 help
1306 Architecture has tls passed as the
1307 not the 5th one.
1308
1309 config CLONE_BACKWARDS2
1310 bool
1311 help
1312 Architecture has the first two argu
1313
1314 config CLONE_BACKWARDS3
1315 bool
1316 help
1317 Architecture has tls passed as the
1318 not the 5th one.
1319
1320 config ODD_RT_SIGACTION
1321 bool
1322 help
1323 Architecture has unusual rt_sigacti
1324
1325 config OLD_SIGSUSPEND
1326 bool
1327 help
1328 Architecture has old sigsuspend(2)
1329
1330 config OLD_SIGSUSPEND3
1331 bool
1332 help
1333 Even weirder antique ABI - three-ar
1334
1335 config OLD_SIGACTION
1336 bool
1337 help
1338 Architecture has old sigaction(2) s
1339 as OLD_SIGSUSPEND | OLD_SIGSUSPEND3
1340 but fairly different variant of sig
1341 compatibility...
1342
1343 config COMPAT_OLD_SIGACTION
1344 bool
1345
1346 config COMPAT_32BIT_TIME
1347 bool "Provide system calls for 32-bit
1348 default !64BIT || COMPAT
1349 help
1350 This enables 32 bit time_t support
1351 This is relevant on all 32-bit arch
1352 as part of compat syscall handling.
1353
1354 config ARCH_NO_PREEMPT
1355 bool
1356
1357 config ARCH_SUPPORTS_RT
1358 bool
1359
1360 config CPU_NO_EFFICIENT_FFS
1361 def_bool n
1362
1363 config HAVE_ARCH_VMAP_STACK
1364 def_bool n
1365 help
1366 An arch should select this symbol i
1367 in vmalloc space. This means:
1368
1369 - vmalloc space must be large enoug
1370 This may rule out many 32-bit arc
1371
1372 - Stacks in vmalloc space need to w
1373 vmap page tables are created on d
1374 needs to work while the stack poi
1375 unpopulated page tables or arch c
1376 most likely) needs to ensure that
1377 are populated before running on a
1378
1379 - If the stack overflows into a gua
1380 should happen. The definition of
1381 instantly rebooting without loggi
1382
1383 config VMAP_STACK
1384 default y
1385 bool "Use a virtually-mapped stack"
1386 depends on HAVE_ARCH_VMAP_STACK
1387 depends on !KASAN || KASAN_HW_TAGS ||
1388 help
1389 Enable this if you want the use vir
1390 with guard pages. This causes kern
1391 caught immediately rather than caus
1392 corruption.
1393
1394 To use this with software KASAN mod
1395 backing virtual mappings with real
1396 must be enabled.
1397
1398 config HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
1399 def_bool n
1400 help
1401 An arch should select this symbol i
1402 offset randomization with calls to
1403 during syscall entry and choose_ran
1404 syscall exit. Careful removal of -f
1405 -fstack-protector should also be ap
1406 closely examined, as the artificial
1407 to the compiler, so it will attempt
1408 of the static branch state.
1409
1410 config RANDOMIZE_KSTACK_OFFSET
1411 bool "Support for randomizing kernel
1412 default y
1413 depends on HAVE_ARCH_RANDOMIZE_KSTACK
1414 depends on INIT_STACK_NONE || !CC_IS_
1415 help
1416 The kernel stack offset can be rand
1417 roughly 5 bits of entropy, frustrat
1418 attacks that depend on stack addres
1419 cross-syscall address exposures.
1420
1421 The feature is controlled via the "
1422 kernel boot param, and if turned of
1423 of static branches (see JUMP_LABEL)
1424
1425 If unsure, say Y.
1426
1427 config RANDOMIZE_KSTACK_OFFSET_DEFAULT
1428 bool "Default state of kernel stack o
1429 depends on RANDOMIZE_KSTACK_OFFSET
1430 help
1431 Kernel stack offset randomization i
1432 "randomize_kstack_offset=on/off", a
1433 boot state.
1434
1435 config ARCH_OPTIONAL_KERNEL_RWX
1436 def_bool n
1437
1438 config ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
1439 def_bool n
1440
1441 config ARCH_HAS_STRICT_KERNEL_RWX
1442 def_bool n
1443
1444 config STRICT_KERNEL_RWX
1445 bool "Make kernel text and rodata rea
1446 depends on ARCH_HAS_STRICT_KERNEL_RWX
1447 default !ARCH_OPTIONAL_KERNEL_RWX ||
1448 help
1449 If this is set, kernel text and rod
1450 and non-text memory will be made no
1451 protection against certain security
1452 or modifying text)
1453
1454 These features are considered stand
1455 You should say Y here in almost all
1456
1457 config ARCH_HAS_STRICT_MODULE_RWX
1458 def_bool n
1459
1460 config STRICT_MODULE_RWX
1461 bool "Set loadable kernel module data
1462 depends on ARCH_HAS_STRICT_MODULE_RWX
1463 default !ARCH_OPTIONAL_KERNEL_RWX ||
1464 help
1465 If this is set, module text and rod
1466 and non-text memory will be made no
1467 protection against certain security
1468
1469 # select if the architecture provides an asm/
1470 config ARCH_HAS_PHYS_TO_DMA
1471 bool
1472
1473 config HAVE_ARCH_COMPILER_H
1474 bool
1475 help
1476 An architecture can select this if
1477 asm/compiler.h header that should b
1478 linux/compiler-*.h in order to over
1479 headers generally provide.
1480
1481 config HAVE_ARCH_PREL32_RELOCATIONS
1482 bool
1483 help
1484 May be selected by an architecture
1485 32-bit relocations, both in the too
1486 in which case relative references c
1487 for PCI fixup, initcalls etc which
1488 architectures, and don't require ru
1489 kernels.
1490
1491 config ARCH_USE_MEMREMAP_PROT
1492 bool
1493
1494 config LOCK_EVENT_COUNTS
1495 bool "Locking event counts collection
1496 depends on DEBUG_FS
1497 help
1498 Enable light-weight counting of var
1499 in the system with minimal performa
1500 the chance of application behavior
1501 differences. The counts are reporte
1502
1503 # Select if the architecture has support for
1504 config ARCH_HAS_RELR
1505 bool
1506
1507 config RELR
1508 bool "Use RELR relocation packing"
1509 depends on ARCH_HAS_RELR && TOOLS_SUP
1510 default y
1511 help
1512 Store the kernel's dynamic relocati
1513 format. Requires a compatible linke
1514 well as compatible NM and OBJCOPY u
1515 are compatible).
1516
1517 config ARCH_HAS_MEM_ENCRYPT
1518 bool
1519
1520 config ARCH_HAS_CC_PLATFORM
1521 bool
1522
1523 config HAVE_SPARSE_SYSCALL_NR
1524 bool
1525 help
1526 An architecture should select this
1527 to save space. For example, MIPS ar
1528 entries at 4000, 5000 and 6000 loca
1529 related optimizations for a given a
1530
1531 config ARCH_HAS_VDSO_DATA
1532 bool
1533
1534 config HAVE_STATIC_CALL
1535 bool
1536
1537 config HAVE_STATIC_CALL_INLINE
1538 bool
1539 depends on HAVE_STATIC_CALL
1540 select OBJTOOL
1541
1542 config HAVE_PREEMPT_DYNAMIC
1543 bool
1544
1545 config HAVE_PREEMPT_DYNAMIC_CALL
1546 bool
1547 depends on HAVE_STATIC_CALL
1548 select HAVE_PREEMPT_DYNAMIC
1549 help
1550 An architecture should select this
1551 model being selected at boot time u
1552
1553 Where an architecture selects HAVE_
1554 preemption function will be patched
1555
1556 Where an architecture does not sele
1557 call to a preemption function will
1558 trampoline will be patched.
1559
1560 It is strongly advised to support i
1561 overhead.
1562
1563 config HAVE_PREEMPT_DYNAMIC_KEY
1564 bool
1565 depends on HAVE_ARCH_JUMP_LABEL
1566 select HAVE_PREEMPT_DYNAMIC
1567 help
1568 An architecture should select this
1569 model being selected at boot time u
1570
1571 Each preemption function will be gi
1572 static key. This should have slight
1573 static calls, as this effectively i
1574 start of its callee. This may avoid
1575 integrate better with CFI schemes.
1576
1577 This will have greater overhead tha
1578 the call to the preemption function
1579
1580 config ARCH_WANT_LD_ORPHAN_WARN
1581 bool
1582 help
1583 An arch should select this symbol o
1584 included, size-asserted, or discard
1585 important because we never want exp
1586 by the linker, since the locations
1587 versions.
1588
1589 config HAVE_ARCH_PFN_VALID
1590 bool
1591
1592 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
1593 bool
1594
1595 config ARCH_SUPPORTS_PAGE_TABLE_CHECK
1596 bool
1597
1598 config ARCH_SPLIT_ARG64
1599 bool
1600 help
1601 If a 32-bit architecture requires 6
1602 pairs of 32-bit arguments, select t
1603
1604 config ARCH_HAS_ELFCORE_COMPAT
1605 bool
1606
1607 config ARCH_HAS_PARANOID_L1D_FLUSH
1608 bool
1609
1610 config ARCH_HAVE_TRACE_MMIO_ACCESS
1611 bool
1612
1613 config DYNAMIC_SIGFRAME
1614 bool
1615
1616 # Select, if arch has a named attribute group
1617 config HAVE_ARCH_NODE_DEV_GROUP
1618 bool
1619
1620 config ARCH_HAS_HW_PTE_YOUNG
1621 bool
1622 help
1623 Architectures that select this opti
1624 accessed bit in PTE entries when us
1625 translations. Architectures that re
1626 this option and override arch_has_h
1627
1628 config ARCH_HAS_NONLEAF_PMD_YOUNG
1629 bool
1630 help
1631 Architectures that select this opti
1632 accessed bit in non-leaf PMD entrie
1633 address translations. Page table wa
1634 may use this capability to reduce t
1635
1636 config ARCH_HAS_KERNEL_FPU_SUPPORT
1637 bool
1638 help
1639 Architectures that select this opti
1640 the kernel, as described in Documen
1641
1642 source "kernel/gcov/Kconfig"
1643
1644 source "scripts/gcc-plugins/Kconfig"
1645
1646 config FUNCTION_ALIGNMENT_4B
1647 bool
1648
1649 config FUNCTION_ALIGNMENT_8B
1650 bool
1651
1652 config FUNCTION_ALIGNMENT_16B
1653 bool
1654
1655 config FUNCTION_ALIGNMENT_32B
1656 bool
1657
1658 config FUNCTION_ALIGNMENT_64B
1659 bool
1660
1661 config FUNCTION_ALIGNMENT
1662 int
1663 default 64 if FUNCTION_ALIGNMENT_64B
1664 default 32 if FUNCTION_ALIGNMENT_32B
1665 default 16 if FUNCTION_ALIGNMENT_16B
1666 default 8 if FUNCTION_ALIGNMENT_8B
1667 default 4 if FUNCTION_ALIGNMENT_4B
1668 default 0
1669
1670 config CC_HAS_MIN_FUNCTION_ALIGNMENT
1671 # Detect availability of the GCC opti
1672 # guarantees minimal alignment for al
1673 # -falign-functions which the compile
1674 def_bool $(cc-option, -fmin-function-
1675
1676 config CC_HAS_SANE_FUNCTION_ALIGNMENT
1677 # Set if the guaranteed alignment wit
1678 # available or extra care is required
1679 # strict alignment always, even with
1680 def_bool CC_HAS_MIN_FUNCTION_ALIGNMEN
1681
1682 config ARCH_NEED_CMPXCHG_1_EMU
1683 bool
1684
1685 endmenu
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