summaryrefslogtreecommitdiff
path: root/arch/Kconfig
blob: 98db63496bab755211fe494a39ea145c2eb22c24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
# SPDX-License-Identifier: GPL-2.0
#
# General architecture dependent options
#

#
# Note: arch/$(SRCARCH)/Kconfig needs to be included first so that it can
# override the default values in this file.
#
source "arch/$(SRCARCH)/Kconfig"

menu "General architecture-dependent options"

config CRASH_CORE
	bool

config KEXEC_CORE
	select CRASH_CORE
	bool

config KEXEC_ELF
	bool

config HAVE_IMA_KEXEC
	bool

config SET_FS
	bool

config HOTPLUG_SMT
	bool

config GENERIC_ENTRY
       bool

config KPROBES
	bool "Kprobes"
	depends on MODULES
	depends on HAVE_KPROBES
	select KALLSYMS
	help
	  Kprobes allows you to trap at almost any kernel address and
	  execute a callback function.  register_kprobe() establishes
	  a probepoint and specifies the callback.  Kprobes is useful
	  for kernel debugging, non-intrusive instrumentation and testing.
	  If in doubt, say "N".

config JUMP_LABEL
	bool "Optimize very unlikely/likely branches"
	depends on HAVE_ARCH_JUMP_LABEL
	depends on CC_HAS_ASM_GOTO
	help
	 This option enables a transparent branch optimization that
	 makes certain almost-always-true or almost-always-false branch
	 conditions even cheaper to execute within the kernel.

	 Certain performance-sensitive kernel code, such as trace points,
	 scheduler functionality, networking code and KVM have such
	 branches and include support for this optimization technique.

	 If it is detected that the compiler has support for "asm goto",
	 the kernel will compile such branches with just a nop
	 instruction. When the condition flag is toggled to true, the
	 nop will be converted to a jump instruction to execute the
	 conditional block of instructions.

	 This technique lowers overhead and stress on the branch prediction
	 of the processor and generally makes the kernel faster. The update
	 of the condition is slower, but those are always very rare.

	 ( On 32-bit x86, the necessary options added to the compiler
	   flags may increase the size of the kernel slightly. )

config STATIC_KEYS_SELFTEST
	bool "Static key selftest"
	depends on JUMP_LABEL
	help
	  Boot time self-test of the branch patching code.

config STATIC_CALL_SELFTEST
	bool "Static call selftest"
	depends on HAVE_STATIC_CALL
	help
	  Boot time self-test of the call patching code.

config OPTPROBES
	def_bool y
	depends on KPROBES && HAVE_OPTPROBES
	select TASKS_RCU if PREEMPTION

config KPROBES_ON_FTRACE
	def_bool y
	depends on KPROBES && HAVE_KPROBES_ON_FTRACE
	depends on DYNAMIC_FTRACE_WITH_REGS
	help
	 If function tracer is enabled and the arch supports full
	 passing of pt_regs to function tracing, then kprobes can
	 optimize on top of function tracing.

config UPROBES
	def_bool n
	depends on ARCH_SUPPORTS_UPROBES
	help
	  Uprobes is the user-space counterpart to kprobes: they
	  enable instrumentation applications (such as 'perf probe')
	  to establish unintrusive probes in user-space binaries and
	  libraries, by executing handler functions when the probes
	  are hit by user-space applications.

	  ( These probes come in the form of single-byte breakpoints,
	    managed by the kernel and kept transparent to the probed
	    application. )

config HAVE_64BIT_ALIGNED_ACCESS
	def_bool 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS
	help
	  Some architectures require 64 bit accesses to be 64 bit
	  aligned, which also requires structs containing 64 bit values
	  to be 64 bit aligned too. This includes some 32 bit
	  architectures which can do 64 bit accesses, as well as 64 bit
	  architectures without unaligned access.

	  This symbol should be selected by an architecture if 64 bit
	  accesses are required to be 64 bit aligned in this way even
	  though it is not a 64 bit architecture.

	  See Documentation/core-api/unaligned-memory-access.rst for
	  more information on the topic of unaligned memory accesses.

config HAVE_EFFICIENT_UNALIGNED_ACCESS
	bool
	help
	  Some architectures are unable to perform unaligned accesses
	  without the use of get_unaligned/put_unaligned. Others are
	  unable to perform such accesses efficiently (e.g. trap on
	  unaligned access and require fixing it up in the exception
	  handler.)

	  This symbol should be selected by an architecture if it can
	  perform unaligned accesses efficiently to allow different
	  code paths to be selected for these cases. Some network
	  drivers, for example, could opt to not fix up alignment
	  problems with received packets if doing so would not help
	  much.

	  See Documentation/core-api/unaligned-memory-access.rst for more
	  information on the topic of unaligned memory accesses.

config ARCH_USE_BUILTIN_BSWAP
	bool
	help
	 Modern versions of GCC (since 4.4) have builtin functions
	 for handling byte-swapping. Using these, instead of the old
	 inline assembler that the architecture code provides in the
	 __arch_bswapXX() macros, allows the compiler to see what's
	 happening and offers more opportunity for optimisation. In
	 particular, the compiler will be able to combine the byteswap
	 with a nearby load or store and use load-and-swap or
	 store-and-swap instructions if the architecture has them. It
	 should almost *never* result in code which is worse than the
	 hand-coded assembler in <asm/swab.h>.  But just in case it
	 does, the use of the builtins is optional.

	 Any architecture with load-and-swap or store-and-swap
	 instructions should set this. And it shouldn't hurt to set it
	 on architectures that don't have such instructions.

config KRETPROBES
	def_bool y
	depends on KPROBES && HAVE_KRETPROBES

config USER_RETURN_NOTIFIER
	bool
	depends on HAVE_USER_RETURN_NOTIFIER
	help
	  Provide a kernel-internal notification when a cpu is about to
	  switch to user mode.

config HAVE_IOREMAP_PROT
	bool

config HAVE_KPROBES
	bool

config HAVE_KRETPROBES
	bool

config HAVE_OPTPROBES
	bool

config HAVE_KPROBES_ON_FTRACE
	bool

config HAVE_FUNCTION_ERROR_INJECTION
	bool

config HAVE_NMI
	bool

#
# An arch should select this if it provides all these things:
#
#	task_pt_regs()		in asm/processor.h or asm/ptrace.h
#	arch_has_single_step()	if there is hardware single-step support
#	arch_has_block_step()	if there is hardware block-step support
#	asm/syscall.h		supplying asm-generic/syscall.h interface
#	linux/regset.h		user_regset interfaces
#	CORE_DUMP_USE_REGSET	#define'd in linux/elf.h
#	TIF_SYSCALL_TRACE	calls tracehook_report_syscall_{entry,exit}
#	TIF_NOTIFY_RESUME	calls tracehook_notify_resume()
#	signal delivery		calls tracehook_signal_handler()
#
config HAVE_ARCH_TRACEHOOK
	bool

config HAVE_DMA_CONTIGUOUS
	bool

config GENERIC_SMP_IDLE_THREAD
	bool

config GENERIC_IDLE_POLL_SETUP
	bool

config ARCH_HAS_FORTIFY_SOURCE
	bool
	help
	  An architecture should select this when it can successfully
	  build and run with CONFIG_FORTIFY_SOURCE.

#
# Select if the arch provides a historic keepinit alias for the retain_initrd
# command line option
#
config ARCH_HAS_KEEPINITRD
	bool

# Select if arch has all set_memory_ro/rw/x/nx() functions in asm/cacheflush.h
config ARCH_HAS_SET_MEMORY
	bool

# Select if arch has all set_direct_map_invalid/default() functions
config ARCH_HAS_SET_DIRECT_MAP
	bool

#
# Select if the architecture provides the arch_dma_set_uncached symbol to
# either provide an uncached segment alias for a DMA allocation, or
# to remap the page tables in place.
#
config ARCH_HAS_DMA_SET_UNCACHED
	bool

#
# Select if the architectures provides the arch_dma_clear_uncached symbol
# to undo an in-place page table remap for uncached access.
#
config ARCH_HAS_DMA_CLEAR_UNCACHED
	bool

# Select if arch init_task must go in the __init_task_data section
config ARCH_TASK_STRUCT_ON_STACK
	bool

# Select if arch has its private alloc_task_struct() function
config ARCH_TASK_STRUCT_ALLOCATOR
	bool

config HAVE_ARCH_THREAD_STRUCT_WHITELIST
	bool
	depends on !ARCH_TASK_STRUCT_ALLOCATOR
	help
	  An architecture should select this to provide hardened usercopy
	  knowledge about what region of the thread_struct should be
	  whitelisted for copying to userspace. Normally this is only the
	  FPU registers. Specifically, arch_thread_struct_whitelist()
	  should be implemented. Without this, the entire thread_struct
	  field in task_struct will be left whitelisted.

# Select if arch has its private alloc_thread_stack() function
config ARCH_THREAD_STACK_ALLOCATOR
	bool

# Select if arch wants to size task_struct dynamically via arch_task_struct_size:
config ARCH_WANTS_DYNAMIC_TASK_STRUCT
	bool

config ARCH_WANTS_NO_INSTR
	bool
	help
	  An architecture should select this if the noinstr macro is being used on
	  functions to denote that the toolchain should avoid instrumenting such
	  functions and is required for correctness.

config ARCH_32BIT_OFF_T
	bool
	depends on !64BIT
	help
	  All new 32-bit architectures should have 64-bit off_t type on
	  userspace side which corresponds to the loff_t kernel type. This
	  is the requirement for modern ABIs. Some existing architectures
	  still support 32-bit off_t. This option is enabled for all such
	  architectures explicitly.

# Selected by 64 bit architectures which have a 32 bit f_tinode in struct ustat
config ARCH_32BIT_USTAT_F_TINODE
	bool

config HAVE_ASM_MODVERSIONS
	bool
	help
	  This symbol should be selected by an architecture if it provides
	  <asm/asm-prototypes.h> to support the module versioning for symbols
	  exported from assembly code.

config HAVE_REGS_AND_STACK_ACCESS_API
	bool
	help
	  This symbol should be selected by an architecture if it supports
	  the API needed to access registers and stack entries from pt_regs,
	  declared in asm/ptrace.h
	  For example the kprobes-based event tracer needs this API.

config HAVE_RSEQ
	bool
	depends on HAVE_REGS_AND_STACK_ACCESS_API
	help
	  This symbol should be selected by an architecture if it
	  supports an implementation of restartable sequences.

config HAVE_FUNCTION_ARG_ACCESS_API
	bool
	help
	  This symbol should be selected by an architecture if it supports
	  the API needed to access function arguments from pt_regs,
	  declared in asm/ptrace.h

config HAVE_HW_BREAKPOINT
	bool
	depends on PERF_EVENTS

config HAVE_MIXED_BREAKPOINTS_REGS
	bool
	depends on HAVE_HW_BREAKPOINT
	help
	  Depending on the arch implementation of hardware breakpoints,
	  some of them have separate registers for data and instruction
	  breakpoints addresses, others have mixed registers to store
	  them but define the access type in a control register.
	  Select this option if your arch implements breakpoints under the
	  latter fashion.

config HAVE_USER_RETURN_NOTIFIER
	bool

config HAVE_PERF_EVENTS_NMI
	bool
	help
	  System hardware can generate an NMI using the perf event
	  subsystem.  Also has support for calculating CPU cycle events
	  to determine how many clock cycles in a given period.

config HAVE_HARDLOCKUP_DETECTOR_PERF
	bool
	depends on HAVE_PERF_EVENTS_NMI
	help
	  The arch chooses to use the generic perf-NMI-based hardlockup
	  detector. Must define HAVE_PERF_EVENTS_NMI.

config HAVE_NMI_WATCHDOG
	depends on HAVE_NMI
	bool
	help
	  The arch provides a low level NMI watchdog. It provides
	  asm/nmi.h, and defines its own arch_touch_nmi_watchdog().

config HAVE_HARDLOCKUP_DETECTOR_ARCH
	bool
	select HAVE_NMI_WATCHDOG
	help
	  The arch chooses to provide its own hardlockup detector, which is
	  a superset of the HAVE_NMI_WATCHDOG. It also conforms to config
	  interfaces and parameters provided by hardlockup detector subsystem.

config HAVE_PERF_REGS
	bool
	help
	  Support selective register dumps for perf events. This includes
	  bit-mapping of each registers and a unique architecture id.

config HAVE_PERF_USER_STACK_DUMP
	bool
	help
	  Support user stack dumps for perf event samples. This needs
	  access to the user stack pointer which is not unified across
	  architectures.

config HAVE_ARCH_JUMP_LABEL
	bool

config HAVE_ARCH_JUMP_LABEL_RELATIVE
	bool

config MMU_GATHER_TABLE_FREE
	bool

config MMU_GATHER_RCU_TABLE_FREE
	bool
	select MMU_GATHER_TABLE_FREE

config MMU_GATHER_PAGE_SIZE
	bool

config MMU_GATHER_NO_RANGE
	bool

config MMU_GATHER_NO_GATHER
	bool
	depends on MMU_GATHER_TABLE_FREE

config ARCH_WANT_IRQS_OFF_ACTIVATE_MM
	bool
	help
	  Temporary select until all architectures can be converted to have
	  irqs disabled over activate_mm. Architectures that do IPI based TLB
	  shootdowns should enable this.

config ARCH_HAVE_NMI_SAFE_CMPXCHG
	bool

config HAVE_ALIGNED_STRUCT_PAGE
	bool
	help
	  This makes sure that struct pages are double word aligned and that
	  e.g. the SLUB allocator can perform double word atomic operations
	  on a struct page for better performance. However selecting this
	  might increase the size of a struct page by a word.

config HAVE_CMPXCHG_LOCAL
	bool

config HAVE_CMPXCHG_DOUBLE
	bool

config ARCH_WEAK_RELEASE_ACQUIRE
	bool

config ARCH_WANT_IPC_PARSE_VERSION
	bool

config ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	bool

config ARCH_WANT_OLD_COMPAT_IPC
	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
	bool

config HAVE_ARCH_SECCOMP
	bool
	help
	  An arch should select this symbol to support seccomp mode 1 (the fixed
	  syscall policy), and must provide an overrides for __NR_seccomp_sigreturn,
	  and compat syscalls if the asm-generic/seccomp.h defaults need adjustment:
	  - __NR_seccomp_read_32
	  - __NR_seccomp_write_32
	  - __NR_seccomp_exit_32
	  - __NR_seccomp_sigreturn_32

config HAVE_ARCH_SECCOMP_FILTER
	bool
	select HAVE_ARCH_SECCOMP
	help
	  An arch should select this symbol if it provides all of these things:
	  - all the requirements for HAVE_ARCH_SECCOMP
	  - syscall_get_arch()
	  - syscall_get_arguments()
	  - syscall_rollback()
	  - syscall_set_return_value()
	  - SIGSYS siginfo_t support
	  - secure_computing is called from a ptrace_event()-safe context
	  - secure_computing return value is checked and a return value of -1
	    results in the system call being skipped immediately.
	  - seccomp syscall wired up
	  - if !HAVE_SPARSE_SYSCALL_NR, have SECCOMP_ARCH_NATIVE,
	    SECCOMP_ARCH_NATIVE_NR, SECCOMP_ARCH_NATIVE_NAME defined. If
	    COMPAT is supported, have the SECCOMP_ARCH_COMPAT* defines too.

config SECCOMP
	prompt "Enable seccomp to safely execute untrusted bytecode"
	def_bool y
	depends on HAVE_ARCH_SECCOMP
	help
	  This kernel feature is useful for number crunching applications
	  that may need to handle untrusted bytecode during their
	  execution. By using pipes or other transports made available
	  to the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in their
	  own address space using seccomp. Once seccomp is enabled via
	  prctl(PR_SET_SECCOMP) or the seccomp() syscall, it cannot be
	  disabled and the task is only allowed to execute a few safe
	  syscalls defined by each seccomp mode.

	  If unsure, say Y.

config SECCOMP_FILTER
	def_bool y
	depends on HAVE_ARCH_SECCOMP_FILTER && SECCOMP && NET
	help
	  Enable tasks to build secure computing environments defined
	  in terms of Berkeley Packet Filter programs which implement
	  task-defined system call filtering polices.

	  See Documentation/userspace-api/seccomp_filter.rst for details.

config SECCOMP_CACHE_DEBUG
	bool "Show seccomp filter cache status in /proc/pid/seccomp_cache"
	depends on SECCOMP_FILTER && !HAVE_SPARSE_SYSCALL_NR
	depends on PROC_FS
	help
	  This enables the /proc/pid/seccomp_cache interface to monitor
	  seccomp cache data. The file format is subject to change. Reading
	  the file requires CAP_SYS_ADMIN.

	  This option is for debugging only. Enabling presents the risk that
	  an adversary may be able to infer the seccomp filter logic.

	  If unsure, say N.

config HAVE_ARCH_STACKLEAK
	bool
	help
	  An architecture should select this if it has the code which
	  fills the used part of the kernel stack with the STACKLEAK_POISON
	  value before returning from system calls.

config HAVE_STACKPROTECTOR
	bool
	help
	  An arch should select this symbol if:
	  - it has implemented a stack canary (e.g. __stack_chk_guard)

config STACKPROTECTOR
	bool "Stack Protector buffer overflow detection"
	depends on HAVE_STACKPROTECTOR
	depends on $(cc-option,-fstack-protector)
	default y
	help
	  This option turns on the "stack-protector" GCC feature. This
	  feature puts, at the beginning of functions, a canary value on
	  the stack just before the return address, and validates
	  the value just before actually returning.  Stack based buffer
	  overflows (that need to overwrite this return address) now also
	  overwrite the canary, which gets detected and the attack is then
	  neutralized via a kernel panic.

	  Functions will have the stack-protector canary logic added if they
	  have an 8-byte or larger character array on the stack.

	  This feature requires gcc version 4.2 or above, or a distribution
	  gcc with the feature backported ("-fstack-protector").

	  On an x86 "defconfig" build, this feature adds canary checks to
	  about 3% of all kernel functions, which increases kernel code size
	  by about 0.3%.

config STACKPROTECTOR_STRONG
	bool "Strong Stack Protector"
	depends on STACKPROTECTOR
	depends on $(cc-option,-fstack-protector-strong)
	default y
	help
	  Functions will have the stack-protector canary logic added in any
	  of the following conditions:

	  - local variable's address used as part of the right hand side of an
	    assignment or function argument
	  - local variable is an array (or union containing an array),
	    regardless of array type or length
	  - uses register local variables

	  This feature requires gcc version 4.9 or above, or a distribution
	  gcc with the feature backported ("-fstack-protector-strong").

	  On an x86 "defconfig" build, this feature adds canary checks to
	  about 20% of all kernel functions, which increases the kernel code
	  size by about 2%.

config ARCH_SUPPORTS_SHADOW_CALL_STACK
	bool
	help
	  An architecture should select this if it supports Clang's Shadow
	  Call Stack and implements runtime support for shadow stack
	  switching.

config SHADOW_CALL_STACK
	bool "Clang Shadow Call Stack"
	depends on CC_IS_CLANG && ARCH_SUPPORTS_SHADOW_CALL_STACK
	depends on DYNAMIC_FTRACE_WITH_REGS || !FUNCTION_GRAPH_TRACER
	help
	  This option enables Clang's Shadow Call Stack, which uses a
	  shadow stack to protect function return addresses from being
	  overwritten by an attacker. More information can be found in
	  Clang's documentation:

	    https://clang.llvm.org/docs/ShadowCallStack.html

	  Note that security guarantees in the kernel differ from the
	  ones documented for user space. The kernel must store addresses
	  of shadow stacks in memory, which means an attacker capable of
	  reading and writing arbitrary memory may be able to locate them
	  and hijack control flow by modifying the stacks.

config LTO
	bool
	help
	  Selected if the kernel will be built using the compiler's LTO feature.

config LTO_CLANG
	bool
	select LTO
	help
	  Selected if the kernel will be built using Clang's LTO feature.

config ARCH_SUPPORTS_LTO_CLANG
	bool
	help
	  An architecture should select this option if it supports:
	  - compiling with Clang,
	  - compiling inline assembly with Clang's integrated assembler,
	  - and linking with LLD.

config ARCH_SUPPORTS_LTO_CLANG_THIN
	bool
	help
	  An architecture should select this option if it can support Clang's
	  ThinLTO mode.

config HAS_LTO_CLANG
	def_bool y
	# Clang >= 11: https://github.com/ClangBuiltLinux/linux/issues/510
	depends on CC_IS_CLANG && CLANG_VERSION >= 110000 && LD_IS_LLD && AS_IS_LLVM
	depends on $(success,$(NM) --help | head -n 1 | grep -qi llvm)
	depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
	depends on ARCH_SUPPORTS_LTO_CLANG
	depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT
	depends on !KASAN || KASAN_HW_TAGS
	depends on !GCOV_KERNEL
	help
	  The compiler and Kconfig options support building with Clang's
	  LTO.

choice
	prompt "Link Time Optimization (LTO)"
	default LTO_NONE
	help
	  This option enables Link Time Optimization (LTO), which allows the
	  compiler to optimize binaries globally.

	  If unsure, select LTO_NONE. Note that LTO is very resource-intensive
	  so it's disabled by default.

config LTO_NONE
	bool "None"
	help
	  Build the kernel normally, without Link Time Optimization (LTO).

config LTO_CLANG_FULL
	bool "Clang Full LTO (EXPERIMENTAL)"
	depends on HAS_LTO_CLANG
	depends on !COMPILE_TEST
	select LTO_CLANG
	help
          This option enables Clang's full Link Time Optimization (LTO), which
          allows the compiler to optimize the kernel globally. If you enable
          this option, the compiler generates LLVM bitcode instead of ELF
          object files, and the actual compilation from bitcode happens at
          the LTO link step, which may take several minutes depending on the
          kernel configuration. More information can be found from LLVM's
          documentation:

	    https://llvm.org/docs/LinkTimeOptimization.html

	  During link time, this option can use a large amount of RAM, and
	  may take much longer than the ThinLTO option.

config LTO_CLANG_THIN
	bool "Clang ThinLTO (EXPERIMENTAL)"
	depends on HAS_LTO_CLANG && ARCH_SUPPORTS_LTO_CLANG_THIN
	select LTO_CLANG
	help
	  This option enables Clang's ThinLTO, which allows for parallel
	  optimization and faster incremental compiles compared to the
	  CONFIG_LTO_CLANG_FULL option. More information can be found
	  from Clang's documentation:

	    https://clang.llvm.org/docs/ThinLTO.html

	  If unsure, say Y.
endchoice

config ARCH_SUPPORTS_CFI_CLANG
	bool
	help
	  An architecture should select this option if it can support Clang's
	  Control-Flow Integrity (CFI) checking.

config CFI_CLANG
	bool "Use Clang's Control Flow Integrity (CFI)"
	depends on LTO_CLANG && ARCH_SUPPORTS_CFI_CLANG
	# Clang >= 12:
	# - https://bugs.llvm.org/show_bug.cgi?id=46258
	# - https://bugs.llvm.org/show_bug.cgi?id=47479
	depends on CLANG_VERSION >= 120000
	select KALLSYMS
	help
	  This option enables Clang’s forward-edge Control Flow Integrity
	  (CFI) checking, where the compiler injects a runtime check to each
	  indirect function call to ensure the target is a valid function with
	  the correct static type. This restricts possible call targets and
	  makes it more difficult for an attacker to exploit bugs that allow
	  the modification of stored function pointers. More information can be
	  found from Clang's documentation:

	    https://clang.llvm.org/docs/ControlFlowIntegrity.html

config CFI_CLANG_SHADOW
	bool "Use CFI shadow to speed up cross-module checks"
	default y
	depends on CFI_CLANG && MODULES
	help
	  If you select this option, the kernel builds a fast look-up table of
	  CFI check functions in loaded modules to reduce performance overhead.

	  If unsure, say Y.

config CFI_PERMISSIVE
	bool "Use CFI in permissive mode"
	depends on CFI_CLANG
	help
	  When selected, Control Flow Integrity (CFI) violations result in a
	  warning instead of a kernel panic. This option should only be used
	  for finding indirect call type mismatches during development.

	  If unsure, say N.

config HAVE_ARCH_WITHIN_STACK_FRAMES
	bool
	help
	  An architecture should select this if it can walk the kernel stack
	  frames to determine if an object is part of either the arguments
	  or local variables (i.e. that it excludes saved return addresses,
	  and similar) by implementing an inline arch_within_stack_frames(),
	  which is used by CONFIG_HARDENED_USERCOPY.

config HAVE_CONTEXT_TRACKING
	bool
	help
	  Provide kernel/user boundaries probes necessary for subsystems
	  that need it, such as userspace RCU extended quiescent state.
	  Syscalls need to be wrapped inside user_exit()-user_enter(), either
	  optimized behind static key or through the slow path using TIF_NOHZ
	  flag. Exceptions handlers must be wrapped as well. Irqs are already
	  protected inside rcu_irq_enter/rcu_irq_exit() but preemption or signal
	  handling on irq exit still need to be protected.

config HAVE_CONTEXT_TRACKING_OFFSTACK
	bool
	help
	  Architecture neither relies on exception_enter()/exception_exit()
	  nor on schedule_user(). Also preempt_schedule_notrace() and
	  preempt_schedule_irq() can't be called in a preemptible section
	  while context tracking is CONTEXT_USER. This feature reflects a sane
	  entry implementation where the following requirements are met on
	  critical entry code, ie: before user_exit() or after user_enter():

	  - Critical entry code isn't preemptible (or better yet:
	    not interruptible).
	  - No use of RCU read side critical sections, unless rcu_nmi_enter()
	    got called.
	  - No use of instrumentation, unless instrumentation_begin() got
	    called.

config HAVE_TIF_NOHZ
	bool
	help
	  Arch relies on TIF_NOHZ and syscall slow path to implement context
	  tracking calls to user_enter()/user_exit().

config HAVE_VIRT_CPU_ACCOUNTING
	bool

config HAVE_VIRT_CPU_ACCOUNTING_IDLE
	bool
	help
	  Architecture has its own way to account idle CPU time and therefore
	  doesn't implement vtime_account_idle().

config ARCH_HAS_SCALED_CPUTIME
	bool

config HAVE_VIRT_CPU_ACCOUNTING_GEN
	bool
	default y if 64BIT
	help
	  With VIRT_CPU_ACCOUNTING_GEN, cputime_t becomes 64-bit.
	  Before enabling this option, arch code must be audited
	  to ensure there are no races in concurrent read/write of
	  cputime_t. For example, reading/writing 64-bit cputime_t on
	  some 32-bit arches may require multiple accesses, so proper
	  locking is needed to protect against concurrent accesses.

config HAVE_IRQ_TIME_ACCOUNTING
	bool
	help
	  Archs need to ensure they use a high enough resolution clock to
	  support irq time accounting and then call enable_sched_clock_irqtime().

config HAVE_MOVE_PUD
	bool
	help
	  Architectures that select this are able to move page tables at the
	  PUD level. If there are only 3 page table levels, the move effectively
	  happens at the PGD level.

config HAVE_MOVE_PMD
	bool
	help
	  Archs that select this are able to move page tables at the PMD level.

config HAVE_ARCH_TRANSPARENT_HUGEPAGE
	bool

config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
	bool

config HAVE_ARCH_HUGE_VMAP
	bool

#
#  Archs that select this would be capable of PMD-sized vmaps (i.e.,
#  arch_vmap_pmd_supported() returns true), and they must make no assumptions
#  that vmalloc memory is mapped with PAGE_SIZE ptes. The VM_NO_HUGE_VMAP flag
#  can be used to prohibit arch-specific allocations from using hugepages to
#  help with this (e.g., modules may require it).
#
config HAVE_ARCH_HUGE_VMALLOC
	depends on HAVE_ARCH_HUGE_VMAP
	bool

config ARCH_WANT_HUGE_PMD_SHARE
	bool

config HAVE_ARCH_SOFT_DIRTY
	bool

config HAVE_MOD_ARCH_SPECIFIC
	bool
	help
	  The arch uses struct mod_arch_specific to store data.  Many arches
	  just need a simple module loader without arch specific data - those
	  should not enable this.

config MODULES_USE_ELF_RELA
	bool
	help
	  Modules only use ELF RELA relocations.  Modules with ELF REL
	  relocations will give an error.

config MODULES_USE_ELF_REL
	bool
	help
	  Modules only use ELF REL relocations.  Modules with ELF RELA
	  relocations will give an error.

config HAVE_IRQ_EXIT_ON_IRQ_STACK
	bool
	help
	  Architecture doesn't only execute the irq handler on the irq stack
	  but also irq_exit(). This way we can process softirqs on this irq
	  stack instead of switching to a new one when we call __do_softirq()
	  in the end of an hardirq.
	  This spares a stack switch and improves cache usage on softirq
	  processing.

config HAVE_SOFTIRQ_ON_OWN_STACK
	bool
	help
	  Architecture provides a function to run __do_softirq() on a
	  seperate stack.

config PGTABLE_LEVELS
	int
	default 2

config ARCH_HAS_ELF_RANDOMIZE
	bool
	help
	  An architecture supports choosing randomized locations for
	  stack, mmap, brk, and ET_DYN. Defined functions:
	  - arch_mmap_rnd()
	  - arch_randomize_brk()

config HAVE_ARCH_MMAP_RND_BITS
	bool
	help
	  An arch should select this symbol if it supports setting a variable
	  number of bits for use in establishing the base address for mmap
	  allocations, has MMU enabled and provides values for both:
	  - ARCH_MMAP_RND_BITS_MIN
	  - ARCH_MMAP_RND_BITS_MAX

config HAVE_EXIT_THREAD
	bool
	help
	  An architecture implements exit_thread.

config ARCH_MMAP_RND_BITS_MIN
	int

config ARCH_MMAP_RND_BITS_MAX
	int

config ARCH_MMAP_RND_BITS_DEFAULT
	int

config ARCH_MMAP_RND_BITS
	int "Number of bits to use for ASLR of mmap base address" if EXPERT
	range ARCH_MMAP_RND_BITS_MIN ARCH_MMAP_RND_BITS_MAX
	default ARCH_MMAP_RND_BITS_DEFAULT if ARCH_MMAP_RND_BITS_DEFAULT
	default ARCH_MMAP_RND_BITS_MIN
	depends on HAVE_ARCH_MMAP_RND_BITS
	help
	  This value can be used to select the number of bits to use to
	  determine the random offset to the base address of vma regions
	  resulting from mmap allocations. This value will be bounded
	  by the architecture's minimum and maximum supported values.

	  This value can be changed after boot using the
	  /proc/sys/vm/mmap_rnd_bits tunable

config HAVE_ARCH_MMAP_RND_COMPAT_BITS
	bool
	help
	  An arch should select this symbol if it supports running applications
	  in compatibility mode, supports setting a variable number of bits for
	  use in establishing the base address for mmap allocations, has MMU
	  enabled and provides values for both:
	  - ARCH_MMAP_RND_COMPAT_BITS_MIN
	  - ARCH_MMAP_RND_COMPAT_BITS_MAX

config ARCH_MMAP_RND_COMPAT_BITS_MIN
	int

config ARCH_MMAP_RND_COMPAT_BITS_MAX
	int

config ARCH_MMAP_RND_COMPAT_BITS_DEFAULT
	int

config ARCH_MMAP_RND_COMPAT_BITS
	int "Number of bits to use for ASLR of mmap base address for compatible applications" if EXPERT
	range ARCH_MMAP_RND_COMPAT_BITS_MIN ARCH_MMAP_RND_COMPAT_BITS_MAX
	default ARCH_MMAP_RND_COMPAT_BITS_DEFAULT if ARCH_MMAP_RND_COMPAT_BITS_DEFAULT
	default ARCH_MMAP_RND_COMPAT_BITS_MIN
	depends on HAVE_ARCH_MMAP_RND_COMPAT_BITS
	help
	  This value can be used to select the number of bits to use to
	  determine the random offset to the base address of vma regions
	  resulting from mmap allocations for compatible applications This
	  value will be bounded by the architecture's minimum and maximum
	  supported values.

	  This value can be changed after boot using the
	  /proc/sys/vm/mmap_rnd_compat_bits tunable

config HAVE_ARCH_COMPAT_MMAP_BASES
	bool
	help
	  This allows 64bit applications to invoke 32-bit mmap() syscall
	  and vice-versa 32-bit applications to call 64-bit mmap().
	  Required for applications doing different bitness syscalls.

# This allows to use a set of generic functions to determine mmap base
# address by giving priority to top-down scheme only if the process
# is not in legacy mode (compat task, unlimited stack size or
# sysctl_legacy_va_layout).
# Architecture that selects this option can provide its own version of:
# - STACK_RND_MASK
config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
	bool
	depends on MMU
	select ARCH_HAS_ELF_RANDOMIZE

config HAVE_STACK_VALIDATION
	bool
	help
	  Architecture supports the 'objtool check' host tool command, which
	  performs compile-time stack metadata validation.

config HAVE_RELIABLE_STACKTRACE
	bool
	help
	  Architecture has either save_stack_trace_tsk_reliable() or
	  arch_stack_walk_reliable() function which only returns a stack trace
	  if it can guarantee the trace is reliable.

config HAVE_ARCH_HASH
	bool
	default n
	help
	  If this is set, the architecture provides an <asm/hash.h>
	  file which provides platform-specific implementations of some
	  functions in <linux/hash.h> or fs/namei.c.

config HAVE_ARCH_NVRAM_OPS
	bool

config ISA_BUS_API
	def_bool ISA

#
# ABI hall of shame
#
config CLONE_BACKWARDS
	bool
	help
	  Architecture has tls passed as the 4th argument of clone(2),
	  not the 5th one.

config CLONE_BACKWARDS2
	bool
	help
	  Architecture has the first two arguments of clone(2) swapped.

config CLONE_BACKWARDS3
	bool
	help
	  Architecture has tls passed as the 3rd argument of clone(2),
	  not the 5th one.

config ODD_RT_SIGACTION
	bool
	help
	  Architecture has unusual rt_sigaction(2) arguments

config OLD_SIGSUSPEND
	bool
	help
	  Architecture has old sigsuspend(2) syscall, of one-argument variety

config OLD_SIGSUSPEND3
	bool
	help
	  Even weirder antique ABI - three-argument sigsuspend(2)

config OLD_SIGACTION
	bool
	help
	  Architecture has old sigaction(2) syscall.  Nope, not the same
	  as OLD_SIGSUSPEND | OLD_SIGSUSPEND3 - alpha has sigsuspend(2),
	  but fairly different variant of sigaction(2), thanks to OSF/1
	  compatibility...

config COMPAT_OLD_SIGACTION
	bool

config COMPAT_32BIT_TIME
	bool "Provide system calls for 32-bit time_t"
	default !64BIT || COMPAT
	help
	  This enables 32 bit time_t support in addition to 64 bit time_t support.
	  This is relevant on all 32-bit architectures, and 64-bit architectures
	  as part of compat syscall handling.

config ARCH_NO_PREEMPT
	bool

config ARCH_EPHEMERAL_INODES
	def_bool n
	help
	  An arch should select this symbol if it doesn't keep track of inode
	  instances on its own, but instead relies on something else (e.g. the
	  host kernel for an UML kernel).

config ARCH_SUPPORTS_RT
	bool

config CPU_NO_EFFICIENT_FFS
	def_bool n

config HAVE_ARCH_VMAP_STACK
	def_bool n
	help
	  An arch should select this symbol if it can support kernel stacks
	  in vmalloc space.  This means:

	  - vmalloc space must be large enough to hold many kernel stacks.
	    This may rule out many 32-bit architectures.

	  - Stacks in vmalloc space need to work reliably.  For example, if
	    vmap page tables are created on demand, either this mechanism
	    needs to work while the stack points to a virtual address with
	    unpopulated page tables or arch code (switch_to() and switch_mm(),
	    most likely) needs to ensure that the stack's page table entries
	    are populated before running on a possibly unpopulated stack.

	  - If the stack overflows into a guard page, something reasonable
	    should happen.  The definition of "reasonable" is flexible, but
	    instantly rebooting without logging anything would be unfriendly.

config VMAP_STACK
	default y
	bool "Use a virtually-mapped stack"
	depends on HAVE_ARCH_VMAP_STACK
	depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC
	help
	  Enable this if you want the use virtually-mapped kernel stacks
	  with guard pages.  This causes kernel stack overflows to be
	  caught immediately rather than causing difficult-to-diagnose
	  corruption.

	  To use this with software KASAN modes, the architecture must support
	  backing virtual mappings with real shadow memory, and KASAN_VMALLOC
	  must be enabled.

config HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
	def_bool n
	help
	  An arch should select this symbol if it can support kernel stack
	  offset randomization with calls to add_random_kstack_offset()
	  during syscall entry and choose_random_kstack_offset() during
	  syscall exit. Careful removal of -fstack-protector-strong and
	  -fstack-protector should also be applied to the entry code and
	  closely examined, as the artificial stack bump looks like an array
	  to the compiler, so it will attempt to add canary checks regardless
	  of the static branch state.

config RANDOMIZE_KSTACK_OFFSET_DEFAULT
	bool "Randomize kernel stack offset on syscall entry"
	depends on HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
	help
	  The kernel stack offset can be randomized (after pt_regs) by
	  roughly 5 bits of entropy, frustrating memory corruption
	  attacks that depend on stack address determinism or
	  cross-syscall address exposures. This feature is controlled
	  by kernel boot param "randomize_kstack_offset=on/off", and this
	  config chooses the default boot state.

config ARCH_OPTIONAL_KERNEL_RWX
	def_bool n

config ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
	def_bool n

config ARCH_HAS_STRICT_KERNEL_RWX
	def_bool n

config STRICT_KERNEL_RWX
	bool "Make kernel text and rodata read-only" if ARCH_OPTIONAL_KERNEL_RWX
	depends on ARCH_HAS_STRICT_KERNEL_RWX
	default !ARCH_OPTIONAL_KERNEL_RWX || ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
	help
	  If this is set, kernel text and rodata memory will be made read-only,
	  and non-text memory will be made non-executable. This provides
	  protection against certain security exploits (e.g. executing the heap
	  or modifying text)

	  These features are considered standard security practice these days.
	  You should say Y here in almost all cases.

config ARCH_HAS_STRICT_MODULE_RWX
	def_bool n

config STRICT_MODULE_RWX
	bool "Set loadable kernel module data as NX and text as RO" if ARCH_OPTIONAL_KERNEL_RWX
	depends on ARCH_HAS_STRICT_MODULE_RWX && MODULES
	default !ARCH_OPTIONAL_KERNEL_RWX || ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
	help
	  If this is set, module text and rodata memory will be made read-only,
	  and non-text memory will be made non-executable. This provides
	  protection against certain security exploits (e.g. writing to text)

# select if the architecture provides an asm/dma-direct.h header
config ARCH_HAS_PHYS_TO_DMA
	bool

config HAVE_ARCH_COMPILER_H
	bool
	help
	  An architecture can select this if it provides an
	  asm/compiler.h header that should be included after
	  linux/compiler-*.h in order to override macro definitions that those
	  headers generally provide.

config HAVE_ARCH_PREL32_RELOCATIONS
	bool
	help
	  May be selected by an architecture if it supports place-relative
	  32-bit relocations, both in the toolchain and in the module loader,
	  in which case relative references can be used in special sections
	  for PCI fixup, initcalls etc which are only half the size on 64 bit
	  architectures, and don't require runtime relocation on relocatable
	  kernels.

config ARCH_USE_MEMREMAP_PROT
	bool

config LOCK_EVENT_COUNTS
	bool "Locking event counts collection"
	depends on DEBUG_FS
	help
	  Enable light-weight counting of various locking related events
	  in the system with minimal performance impact. This reduces
	  the chance of application behavior change because of timing
	  differences. The counts are reported via debugfs.

# Select if the architecture has support for applying RELR relocations.
config ARCH_HAS_RELR
	bool

config RELR
	bool "Use RELR relocation packing"
	depends on ARCH_HAS_RELR && TOOLS_SUPPORT_RELR
	default y
	help
	  Store the kernel's dynamic relocations in the RELR relocation packing
	  format. Requires a compatible linker (LLD supports this feature), as
	  well as compatible NM and OBJCOPY utilities (llvm-nm and llvm-objcopy
	  are compatible).

config ARCH_HAS_MEM_ENCRYPT
	bool

config HAVE_SPARSE_SYSCALL_NR
       bool
       help
          An architecture should select this if its syscall numbering is sparse
	  to save space. For example, MIPS architecture has a syscall array with
	  entries at 4000, 5000 and 6000 locations. This option turns on syscall
	  related optimizations for a given architecture.

config ARCH_HAS_VDSO_DATA
	bool

config HAVE_STATIC_CALL
	bool

config HAVE_STATIC_CALL_INLINE
	bool
	depends on HAVE_STATIC_CALL

config HAVE_PREEMPT_DYNAMIC
	bool
	depends on HAVE_STATIC_CALL
	depends on GENERIC_ENTRY
	help
	   Select this if the architecture support boot time preempt setting
	   on top of static calls. It is strongly advised to support inline
	   static call to avoid any overhead.

config ARCH_WANT_LD_ORPHAN_WARN
	bool
	help
	  An arch should select this symbol once all linker sections are explicitly
	  included, size-asserted, or discarded in the linker scripts. This is
	  important because we never want expected sections to be placed heuristically
	  by the linker, since the locations of such sections can change between linker
	  versions.

config HAVE_ARCH_PFN_VALID
	bool

config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	bool

config ARCH_SPLIT_ARG64
	bool
	help
	   If a 32-bit architecture requires 64-bit arguments to be split into
	   pairs of 32-bit arguments, select this option.

config ARCH_HAS_ELFCORE_COMPAT
	bool

config ARCH_HAS_PARANOID_L1D_FLUSH
	bool

source "kernel/gcov/Kconfig"

source "scripts/gcc-plugins/Kconfig"

endmenu