config/Config-kernel.in

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Copyright (C) 2006-2014 OpenWrt.org
   4
   5 config KERNEL_BUILD_USER
   6         string "Custom Kernel Build User Name"
   7         default "builder" if BUILDBOT
   8         default ""
   9         help
  10           Sets the Kernel build user string, which for example will be returned
  11           by 'uname -a' on running systems.
  12           If not set, uses system user at build time.
  13
  14 config KERNEL_BUILD_DOMAIN
  15         string "Custom Kernel Build Domain Name"
  16         default "buildhost" if BUILDBOT
  17         default ""
  18         help
  19           Sets the Kernel build domain string, which for example will be
  20           returned by 'uname -a' on running systems.
  21           If not set, uses system hostname at build time.
  22
  23 config KERNEL_PRINTK
  24         bool "Enable support for printk"
  25         default y
  26
  27 config KERNEL_SWAP
  28         bool "Support for paging of anonymous memory (swap)"
  29         default y if !SMALL_FLASH
  30
  31 config KERNEL_PROC_STRIPPED
  32         bool "Strip non-essential /proc functionality to reduce code size"
  33         default y if SMALL_FLASH
  34
  35 config KERNEL_DEBUG_FS
  36         bool "Compile the kernel with debug filesystem enabled"
  37         default y
  38         help
  39           debugfs is a virtual file system that kernel developers use to put
  40           debugging files into. Enable this option to be able to read and
  41           write to these files. Many common debugging facilities, such as
  42           ftrace, require the existence of debugfs.
  43
  44 config KERNEL_MIPS_FP_SUPPORT
  45         bool
  46         default y if TARGET_pistachio
  47
  48 config KERNEL_ARM_PMU
  49         bool
  50         depends on (arm || aarch64)
  51
  52 config KERNEL_X86_VSYSCALL_EMULATION
  53         bool "Enable vsyscall emulation"
  54         depends on x86_64
  55         help
  56           This enables emulation of the legacy vsyscall page.  Disabling
  57           it is roughly equivalent to booting with vsyscall=none, except
  58           that it will also disable the helpful warning if a program
  59           tries to use a vsyscall.  With this option set to N, offending
  60           programs will just segfault, citing addresses of the form
  61           0xffffffffff600?00.
  62
  63           This option is required by many programs built before 2013, and
  64           care should be used even with newer programs if set to N.
  65
  66           Disabling this option saves about 7K of kernel size and
  67           possibly 4K of additional runtime pagetable memory.
  68
  69 config KERNEL_PERF_EVENTS
  70         bool "Compile the kernel with performance events and counters"
  71         select KERNEL_ARM_PMU if (arm || aarch64)
  72
  73 config KERNEL_PROFILING
  74         bool "Compile the kernel with profiling enabled"
  75         select KERNEL_PERF_EVENTS
  76         help
  77           Enable the extended profiling support mechanisms used by profilers such
  78           as OProfile.
  79
  80 config KERNEL_RPI_AXIPERF
  81         bool "Compile the kernel with RaspberryPi AXI Performance monitors"
  82         default y
  83         depends on KERNEL_PERF_EVENTS && TARGET_bcm27xx
  84
  85 config KERNEL_UBSAN
  86         bool "Compile the kernel with undefined behaviour sanity checker"
  87         help
  88           This option enables undefined behaviour sanity checker
  89           Compile-time instrumentation is used to detect various undefined
  90           behaviours in runtime. Various types of checks may be enabled
  91           via boot parameter ubsan_handle
  92           (see: Documentation/dev-tools/ubsan.rst).
  93
  94 config KERNEL_UBSAN_SANITIZE_ALL
  95         bool "Enable instrumentation for the entire kernel"
  96         depends on KERNEL_UBSAN
  97         default y
  98         help
  99           This option activates instrumentation for the entire kernel.
 100           If you don't enable this option, you have to explicitly specify
 101           UBSAN_SANITIZE := y for the files/directories you want to check for UB.
 102           Enabling this option will get kernel image size increased
 103           significantly.
 104
 105 config KERNEL_UBSAN_ALIGNMENT
 106         bool "Enable checking of pointers alignment"
 107         depends on KERNEL_UBSAN
 108         help
 109           This option enables detection of unaligned memory accesses.
 110           Enabling this option on architectures that support unaligned
 111           accesses may produce a lot of false positives.
 112
 113 config KERNEL_UBSAN_BOUNDS
 114         bool "Perform array index bounds checking"
 115         depends on KERNEL_UBSAN
 116         help
 117           This option enables detection of directly indexed out of bounds array
 118           accesses, where the array size is known at compile time. Note that
 119           this does not protect array overflows via bad calls to the
 120           {str,mem}*cpy() family of functions (that is addressed by
 121           FORTIFY_SOURCE).
 122
 123 config KERNEL_UBSAN_NULL
 124         bool "Enable checking of null pointers"
 125         depends on KERNEL_UBSAN
 126         help
 127           This option enables detection of memory accesses via a
 128           null pointer.
 129
 130 config KERNEL_UBSAN_TRAP
 131         bool "On Sanitizer warnings, abort the running kernel code"
 132         depends on KERNEL_UBSAN
 133         help
 134           Building kernels with Sanitizer features enabled tends to grow the
 135           kernel size by around 5%, due to adding all the debugging text on
 136           failure paths. To avoid this, Sanitizer instrumentation can just
 137           issue a trap. This reduces the kernel size overhead but turns all
 138           warnings (including potentially harmless conditions) into full
 139           exceptions that abort the running kernel code (regardless of context,
 140           locks held, etc), which may destabilize the system. For some system
 141           builders this is an acceptable trade-off.
 142
 143 config KERNEL_KASAN
 144         bool "Compile the kernel with KASan: runtime memory debugger"
 145         select KERNEL_SLUB_DEBUG
 146         depends on (x86_64 || aarch64)
 147         help
 148           Enables kernel address sanitizer - runtime memory debugger,
 149           designed to find out-of-bounds accesses and use-after-free bugs.
 150           This is strictly a debugging feature and it requires a gcc version
 151           of 4.9.2 or later. Detection of out of bounds accesses to stack or
 152           global variables requires gcc 5.0 or later.
 153           This feature consumes about 1/8 of available memory and brings about
 154           ~x3 performance slowdown.
 155           For better error detection enable CONFIG_STACKTRACE.
 156           Currently CONFIG_KASAN doesn't work with CONFIG_DEBUG_SLAB
 157           (the resulting kernel does not boot).
 158
 159 config KERNEL_KASAN_EXTRA
 160         bool "KAsan: extra checks"
 161         depends on KERNEL_KASAN && KERNEL_DEBUG_KERNEL
 162         help
 163           This enables further checks in the kernel address sanitizer, for now
 164           it only includes the address-use-after-scope check that can lead
 165           to excessive kernel stack usage, frame size warnings and longer
 166           compile time.
 167           https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 has more
 168
 169 config KERNEL_KASAN_VMALLOC
 170         bool "Back mappings in vmalloc space with real shadow memory"
 171         depends on KERNEL_KASAN
 172         help
 173           By default, the shadow region for vmalloc space is the read-only
 174           zero page. This means that KASAN cannot detect errors involving
 175           vmalloc space.
 176
 177           Enabling this option will hook in to vmap/vmalloc and back those
 178           mappings with real shadow memory allocated on demand. This allows
 179           for KASAN to detect more sorts of errors (and to support vmapped
 180           stacks), but at the cost of higher memory usage.
 181
 182           This option depends on HAVE_ARCH_KASAN_VMALLOC, but we can't
 183           depend on that in here, so it is possible that enabling this
 184           will have no effect.
 185
 186 if KERNEL_KASAN
 187         config KERNEL_KASAN_GENERIC
 188         def_bool y
 189
 190         config KERNEL_KASAN_SW_TAGS
 191         def_bool n
 192 endif
 193
 194 choice
 195         prompt "Instrumentation type"
 196         depends on KERNEL_KASAN
 197         default KERNEL_KASAN_OUTLINE
 198
 199 config KERNEL_KASAN_OUTLINE
 200         bool "Outline instrumentation"
 201         help
 202           Before every memory access compiler insert function call
 203           __asan_load*/__asan_store*. These functions performs check
 204           of shadow memory. This is slower than inline instrumentation,
 205           however it doesn't bloat size of kernel's .text section so
 206           much as inline does.
 207
 208 config KERNEL_KASAN_INLINE
 209         bool "Inline instrumentation"
 210         help
 211           Compiler directly inserts code checking shadow memory before
 212           memory accesses. This is faster than outline (in some workloads
 213           it gives about x2 boost over outline instrumentation), but
 214           make kernel's .text size much bigger.
 215           This requires a gcc version of 5.0 or later.
 216
 217 endchoice
 218
 219 config KERNEL_KCOV
 220         bool "Compile the kernel with code coverage for fuzzing"
 221         select KERNEL_DEBUG_FS
 222         help
 223           KCOV exposes kernel code coverage information in a form suitable
 224           for coverage-guided fuzzing (randomized testing).
 225
 226           If RANDOMIZE_BASE is enabled, PC values will not be stable across
 227           different machines and across reboots. If you need stable PC values,
 228           disable RANDOMIZE_BASE.
 229
 230           For more details, see Documentation/kcov.txt.
 231
 232 config KERNEL_KCOV_ENABLE_COMPARISONS
 233         bool "Enable comparison operands collection by KCOV"
 234         depends on KERNEL_KCOV
 235         help
 236           KCOV also exposes operands of every comparison in the instrumented
 237           code along with operand sizes and PCs of the comparison instructions.
 238           These operands can be used by fuzzing engines to improve the quality
 239           of fuzzing coverage.
 240
 241 config KERNEL_KCOV_INSTRUMENT_ALL
 242         bool "Instrument all code by default"
 243         depends on KERNEL_KCOV
 244         default y if KERNEL_KCOV
 245         help
 246           If you are doing generic system call fuzzing (like e.g. syzkaller),
 247           then you will want to instrument the whole kernel and you should
 248           say y here. If you are doing more targeted fuzzing (like e.g.
 249           filesystem fuzzing with AFL) then you will want to enable coverage
 250           for more specific subsets of files, and should say n here.
 251
 252 config KERNEL_TASKSTATS
 253         bool "Compile the kernel with task resource/io statistics and accounting"
 254         help
 255           Enable the collection and publishing of task/io statistics and
 256           accounting.  Enable this option to enable i/o monitoring in system
 257           monitors.
 258
 259 if KERNEL_TASKSTATS
 260
 261         config KERNEL_TASK_DELAY_ACCT
 262                 def_bool y
 263
 264         config KERNEL_TASK_IO_ACCOUNTING
 265                 def_bool y
 266
 267         config KERNEL_TASK_XACCT
 268                 def_bool y
 269
 270 endif
 271
 272 config KERNEL_KALLSYMS
 273         bool "Compile the kernel with symbol table information"
 274         default y if !SMALL_FLASH
 275         help
 276           This will give you more information in stack traces from kernel oopses.
 277
 278 config KERNEL_FTRACE
 279         bool "Compile the kernel with tracing support"
 280         depends on !TARGET_uml
 281
 282 config KERNEL_FTRACE_SYSCALLS
 283         bool "Trace system calls"
 284         depends on KERNEL_FTRACE
 285
 286 config KERNEL_ENABLE_DEFAULT_TRACERS
 287         bool "Trace process context switches and events"
 288         depends on KERNEL_FTRACE
 289
 290 config KERNEL_FUNCTION_TRACER
 291         bool "Function tracer"
 292         depends on KERNEL_FTRACE
 293
 294 config KERNEL_FUNCTION_GRAPH_TRACER
 295         bool "Function graph tracer"
 296         depends on KERNEL_FUNCTION_TRACER
 297
 298 config KERNEL_DYNAMIC_FTRACE
 299         bool "Enable/disable function tracing dynamically"
 300         depends on KERNEL_FUNCTION_TRACER
 301
 302 config KERNEL_FUNCTION_PROFILER
 303         bool "Function profiler"
 304         depends on KERNEL_FUNCTION_TRACER
 305
 306 config KERNEL_IRQSOFF_TRACER
 307         bool "Interrupts-off Latency Tracer"
 308         depends on KERNEL_FTRACE
 309         help
 310           This option measures the time spent in irqs-off critical
 311           sections, with microsecond accuracy.
 312
 313           The default measurement method is a maximum search, which is
 314           disabled by default and can be runtime (re-)started
 315           via:
 316
 317               echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
 318
 319           (Note that kernel size and overhead increase with this option
 320           enabled. This option and the preempt-off timing option can be
 321           used together or separately.)
 322
 323 config KERNEL_PREEMPT_TRACER
 324         bool "Preemption-off Latency Tracer"
 325         depends on KERNEL_FTRACE
 326         help
 327           This option measures the time spent in preemption-off critical
 328           sections, with microsecond accuracy.
 329
 330           The default measurement method is a maximum search, which is
 331           disabled by default and can be runtime (re-)started
 332           via:
 333
 334               echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
 335
 336           (Note that kernel size and overhead increase with this option
 337           enabled. This option and the irqs-off timing option can be
 338           used together or separately.)
 339
 340 config KERNEL_HIST_TRIGGERS
 341         bool "Histogram triggers"
 342         depends on KERNEL_FTRACE
 343         help
 344           Hist triggers allow one or more arbitrary trace event fields to be
 345           aggregated into hash tables and dumped to stdout by reading a
 346           debugfs/tracefs file. They're useful for gathering quick and dirty
 347           (though precise) summaries of event activity as an initial guide for
 348           further investigation using more advanced tools.
 349
 350           Inter-event tracing of quantities such as latencies is also
 351           supported using hist triggers under this option.
 352
 353 config KERNEL_DEBUG_KERNEL
 354         bool
 355
 356 config KERNEL_DEBUG_INFO
 357         bool "Compile the kernel with debug information"
 358         default y if !SMALL_FLASH
 359         select KERNEL_DEBUG_KERNEL
 360         help
 361           This will compile your kernel and modules with debug information.
 362
 363 config KERNEL_DEBUG_INFO_BTF
 364
 365         bool "Enable additional BTF type information"
 366         depends on !HOST_OS_MACOS
 367         depends on KERNEL_DEBUG_INFO && !KERNEL_DEBUG_INFO_REDUCED
 368         select DWARVES
 369         help
 370           Generate BPF Type Format (BTF) information from DWARF debug info.
 371           Turning this on expects presence of pahole tool, which will convert
 372           DWARF type info into equivalent deduplicated BTF type info.
 373
 374           Required to run BPF CO-RE applications.
 375
 376 config KERNEL_DEBUG_INFO_REDUCED
 377         bool "Reduce debugging information"
 378         default y
 379         depends on KERNEL_DEBUG_INFO
 380         help
 381           If you say Y here gcc is instructed to generate less debugging
 382           information for structure types. This means that tools that
 383           need full debugging information (like kgdb or systemtap) won't
 384           be happy. But if you merely need debugging information to
 385           resolve line numbers there is no loss. Advantage is that
 386           build directory object sizes shrink dramatically over a full
 387           DEBUG_INFO build and compile times are reduced too.
 388           Only works with newer gcc versions.
 389
 390 # KERNEL_DEBUG_LL symbols must have the default value set as otherwise
 391 # KConfig wont evaluate them unless KERNEL_EARLY_PRINTK is selected
 392 # which means that buildroot wont override the DEBUG_LL symbols in target
 393 # kernel configurations and lead to devices that dont have working console
 394 config KERNEL_DEBUG_LL_UART_NONE
 395         bool
 396         default n
 397         depends on arm
 398
 399 config KERNEL_DEBUG_LL
 400         bool
 401         default n
 402         depends on arm
 403         select KERNEL_DEBUG_LL_UART_NONE
 404         help
 405           ARM low level debugging.
 406
 407 config KERNEL_DEBUG_VIRTUAL
 408         bool "Compile the kernel with VM translations debugging"
 409         select KERNEL_DEBUG_KERNEL
 410         help
 411           Enable checks sanity checks to catch invalid uses of
 412           virt_to_phys()/phys_to_virt() against the non-linear address space.
 413
 414 config KERNEL_DYNAMIC_DEBUG
 415         bool "Compile the kernel with dynamic printk"
 416         select KERNEL_DEBUG_FS
 417         help
 418           Compiles debug level messages into the kernel, which would not
 419           otherwise be available at runtime. These messages can then be
 420           enabled/disabled based on various levels of scope - per source file,
 421           function, module, format string, and line number. This mechanism
 422           implicitly compiles in all pr_debug() and dev_dbg() calls, which
 423           enlarges the kernel text size by about 2%.
 424
 425 config KERNEL_EARLY_PRINTK
 426         bool "Compile the kernel with early printk"
 427         default y if TARGET_bcm53xx
 428         depends on arm
 429         select KERNEL_DEBUG_KERNEL
 430         select KERNEL_DEBUG_LL if arm
 431         help
 432           Compile the kernel with early printk support.  This is only useful for
 433           debugging purposes to send messages over the serial console in early boot.
 434           Enable this to debug early boot problems.
 435
 436 config KERNEL_KPROBES
 437         bool "Compile the kernel with kprobes support"
 438         select KERNEL_FTRACE
 439         select KERNEL_PERF_EVENTS
 440         help
 441           Compiles the kernel with KPROBES support, which allows you to trap
 442           at almost any kernel address and execute a callback function.
 443           register_kprobe() establishes a probepoint and specifies the
 444           callback. Kprobes is useful for kernel debugging, non-intrusive
 445           instrumentation and testing.
 446           If in doubt, say "N".
 447
 448 config KERNEL_KPROBE_EVENTS
 449         bool
 450         default y if KERNEL_KPROBES
 451
 452 config KERNEL_BPF_EVENTS
 453         bool "Compile the kernel with BPF event support"
 454         select KERNEL_KPROBES
 455         help
 456           Allows to attach BPF programs to kprobe, uprobe and tracepoint events.
 457           This is required to use BPF maps of type BPF_MAP_TYPE_PERF_EVENT_ARRAY
 458           for sending data from BPF programs to user-space for post-processing
 459           or logging.
 460
 461 config KERNEL_BPF_KPROBE_OVERRIDE
 462         bool
 463         depends on KERNEL_KPROBES
 464         default n
 465
 466 config KERNEL_AIO
 467         bool "Compile the kernel with asynchronous IO support"
 468         default y if !SMALL_FLASH
 469
 470 config KERNEL_IO_URING
 471         bool "Compile the kernel with io_uring support"
 472         default y if !SMALL_FLASH
 473
 474 config KERNEL_FHANDLE
 475         bool "Compile the kernel with support for fhandle syscalls"
 476         default y if !SMALL_FLASH
 477
 478 config KERNEL_FANOTIFY
 479         bool "Compile the kernel with modern file notification support"
 480         default y if !SMALL_FLASH
 481
 482 config KERNEL_BLK_DEV_BSG
 483         bool "Compile the kernel with SCSI generic v4 support for any block device"
 484
 485 config KERNEL_TRANSPARENT_HUGEPAGE
 486         bool
 487
 488 choice
 489         prompt "Transparent Hugepage Support sysfs defaults"
 490         depends on KERNEL_TRANSPARENT_HUGEPAGE
 491         default KERNEL_TRANSPARENT_HUGEPAGE_ALWAYS
 492
 493         config KERNEL_TRANSPARENT_HUGEPAGE_ALWAYS
 494                 bool "always"
 495
 496         config KERNEL_TRANSPARENT_HUGEPAGE_MADVISE
 497                 bool "madvise"
 498 endchoice
 499
 500 config KERNEL_HUGETLBFS
 501         bool
 502
 503 config KERNEL_HUGETLB_PAGE
 504         bool "Compile the kernel with HugeTLB support"
 505         select KERNEL_TRANSPARENT_HUGEPAGE
 506         select KERNEL_HUGETLBFS
 507
 508 config KERNEL_MAGIC_SYSRQ
 509         bool "Compile the kernel with SysRq support"
 510         default y
 511
 512 config KERNEL_DEBUG_PINCTRL
 513         bool "Compile the kernel with pinctrl debugging"
 514         select KERNEL_DEBUG_KERNEL
 515
 516 config KERNEL_DEBUG_GPIO
 517         bool "Compile the kernel with gpio debugging"
 518         select KERNEL_DEBUG_KERNEL
 519
 520 config KERNEL_COREDUMP
 521         bool
 522
 523 config KERNEL_ELF_CORE
 524         bool "Enable process core dump support"
 525         select KERNEL_COREDUMP
 526         default y if !SMALL_FLASH
 527
 528 config KERNEL_PROVE_LOCKING
 529         bool "Enable kernel lock checking"
 530         select KERNEL_DEBUG_KERNEL
 531
 532 config KERNEL_SOFTLOCKUP_DETECTOR
 533         bool "Compile the kernel with detect Soft Lockups"
 534         depends on KERNEL_DEBUG_KERNEL
 535         help
 536           Say Y here to enable the kernel to act as a watchdog to detect
 537           soft lockups.
 538
 539           Softlockups are bugs that cause the kernel to loop in kernel
 540           mode for more than 20 seconds, without giving other tasks a
 541           chance to run.  The current stack trace is displayed upon
 542           detection and the system will stay locked up.
 543
 544 config KERNEL_HARDLOCKUP_DETECTOR
 545         bool "Compile the kernel with detect Hard Lockups"
 546         depends on KERNEL_DEBUG_KERNEL
 547         help
 548           Say Y here to enable the kernel to act as a watchdog to detect
 549           hard lockups.
 550
 551           Hardlockups are bugs that cause the CPU to loop in kernel mode
 552           for more than 10 seconds, without letting other interrupts have a
 553           chance to run.  The current stack trace is displayed upon detection
 554           and the system will stay locked up.
 555
 556 config KERNEL_DETECT_HUNG_TASK
 557         bool "Compile the kernel with detect Hung Tasks"
 558         depends on KERNEL_DEBUG_KERNEL
 559         default KERNEL_SOFTLOCKUP_DETECTOR
 560         help
 561           Say Y here to enable the kernel to detect "hung tasks",
 562           which are bugs that cause the task to be stuck in
 563           uninterruptible "D" state indefinitely.
 564
 565           When a hung task is detected, the kernel will print the
 566           current stack trace (which you should report), but the
 567           task will stay in uninterruptible state. If lockdep is
 568           enabled then all held locks will also be reported. This
 569           feature has negligible overhead.
 570
 571 config KERNEL_WQ_WATCHDOG
 572         bool "Compile the kernel with detect Workqueue Stalls"
 573         depends on KERNEL_DEBUG_KERNEL
 574         help
 575           Say Y here to enable stall detection on workqueues.  If a
 576           worker pool doesn't make forward progress on a pending work
 577           item for over a given amount of time, 30s by default, a
 578           warning message is printed along with dump of workqueue
 579           state.  This can be configured through kernel parameter
 580           "workqueue.watchdog_thresh" and its sysfs counterpart.
 581
 582 config KERNEL_DEBUG_ATOMIC_SLEEP
 583         bool "Compile the kernel with sleep inside atomic section checking"
 584         depends on KERNEL_DEBUG_KERNEL
 585         help
 586           If you say Y here, various routines which may sleep will become very
 587           noisy if they are called inside atomic sections: when a spinlock is
 588           held, inside an rcu read side critical section, inside preempt disabled
 589           sections, inside an interrupt, etc...
 590
 591 config KERNEL_DEBUG_VM
 592         bool "Compile the kernel with debug VM"
 593         depends on KERNEL_DEBUG_KERNEL
 594         help
 595           Enable this to turn on extended checks in the virtual-memory system
 596           that may impact performance.
 597
 598           If unsure, say N.
 599
 600 config KERNEL_PRINTK_TIME
 601         bool "Enable printk timestamps"
 602         default y
 603
 604 config KERNEL_SLUB_DEBUG
 605         bool
 606
 607 config KERNEL_SLUB_DEBUG_ON
 608         bool
 609
 610 config KERNEL_SLABINFO
 611         select KERNEL_SLUB_DEBUG
 612         select KERNEL_SLUB_DEBUG_ON
 613         bool "Enable /proc slab debug info"
 614
 615 config KERNEL_PROC_PAGE_MONITOR
 616         bool "Enable /proc page monitoring"
 617
 618 config KERNEL_RELAY
 619         bool
 620
 621 config KERNEL_KEXEC
 622         bool "Enable kexec support"
 623
 624 config KERNEL_PROC_VMCORE
 625         bool
 626
 627 config KERNEL_PROC_KCORE
 628         bool
 629
 630 config KERNEL_CRASH_DUMP
 631         depends on i386 || x86_64 || arm || armeb
 632         select KERNEL_KEXEC
 633         select KERNEL_PROC_VMCORE
 634         select KERNEL_PROC_KCORE
 635         bool "Enable support for kexec crashdump"
 636         default y
 637
 638 config USE_RFKILL
 639         bool "Enable rfkill support"
 640         default RFKILL_SUPPORT
 641
 642 config USE_SPARSE
 643         bool "Enable sparse check during kernel build"
 644
 645 config KERNEL_DEVTMPFS
 646         bool "Compile the kernel with device tmpfs enabled"
 647         help
 648           devtmpfs is a simple, kernel-managed /dev filesystem. The kernel creates
 649           devices nodes for all registered devices to simplify boot, but leaves more
 650           complex tasks to userspace (e.g. udev).
 651
 652 if KERNEL_DEVTMPFS
 653
 654         config KERNEL_DEVTMPFS_MOUNT
 655                 bool "Automatically mount devtmpfs after root filesystem is mounted"
 656
 657 endif
 658
 659 config KERNEL_KEYS
 660         bool "Enable kernel access key retention support"
 661         default !SMALL_FLASH
 662
 663 config KERNEL_PERSISTENT_KEYRINGS
 664         bool "Enable kernel persistent keyrings"
 665         depends on KERNEL_KEYS
 666
 667 config KERNEL_KEYS_REQUEST_CACHE
 668         bool "Enable temporary caching of the last request_key() result"
 669         depends on KERNEL_KEYS
 670
 671 config KERNEL_BIG_KEYS
 672         bool "Enable large payload keys on kernel keyrings"
 673         depends on KERNEL_KEYS
 674
 675 #
 676 # CGROUP support symbols
 677 #
 678
 679 config KERNEL_CGROUPS
 680         bool "Enable kernel cgroups"
 681         default y if !SMALL_FLASH
 682
 683 if KERNEL_CGROUPS
 684
 685         config KERNEL_CGROUP_DEBUG
 686                 bool "Example debug cgroup subsystem"
 687                 help
 688                   This option enables a simple cgroup subsystem that
 689                   exports useful debugging information about the cgroups
 690                   framework.
 691
 692         config KERNEL_FREEZER
 693                 bool
 694
 695         config KERNEL_CGROUP_FREEZER
 696                 bool "legacy Freezer cgroup subsystem"
 697                 select KERNEL_FREEZER
 698                 help
 699                   Provides a way to freeze and unfreeze all tasks in a
 700                   cgroup.
 701                   (legacy cgroup1-only controller, in cgroup2 freezer
 702                   is integrated in the Memory controller)
 703
 704         config KERNEL_CGROUP_DEVICE
 705                 bool "legacy Device controller for cgroups"
 706                 help
 707                   Provides a cgroup implementing whitelists for devices which
 708                   a process in the cgroup can mknod or open.
 709                   (legacy cgroup1-only controller)
 710
 711         config KERNEL_CGROUP_HUGETLB
 712                 bool "HugeTLB controller"
 713                 select KERNEL_HUGETLB_PAGE
 714
 715         config KERNEL_CGROUP_PIDS
 716                 bool "PIDs cgroup subsystem"
 717                 default y
 718                 help
 719                   Provides enforcement of process number limits in the scope of a
 720                   cgroup.
 721
 722         config KERNEL_CGROUP_RDMA
 723                 bool "RDMA controller for cgroups"
 724                 default y
 725
 726         config KERNEL_CGROUP_BPF
 727                 bool "Support for eBPF programs attached to cgroups"
 728                 default y
 729
 730         config KERNEL_CPUSETS
 731                 bool "Cpuset support"
 732                 default y
 733                 help
 734                   This option will let you create and manage CPUSETs which
 735                   allow dynamically partitioning a system into sets of CPUs and
 736                   Memory Nodes and assigning tasks to run only within those sets.
 737                   This is primarily useful on large SMP or NUMA systems.
 738
 739         config KERNEL_PROC_PID_CPUSET
 740                 bool "Include legacy /proc/<pid>/cpuset file"
 741                 depends on KERNEL_CPUSETS
 742
 743         config KERNEL_CGROUP_CPUACCT
 744                 bool "Simple CPU accounting cgroup subsystem"
 745                 default y
 746                 help
 747                   Provides a simple Resource Controller for monitoring the
 748                   total CPU consumed by the tasks in a cgroup.
 749
 750         config KERNEL_RESOURCE_COUNTERS
 751                 bool "Resource counters"
 752                 default y
 753                 help
 754                   This option enables controller independent resource accounting
 755                   infrastructure that works with cgroups.
 756
 757         config KERNEL_MM_OWNER
 758                 bool
 759                 default y if KERNEL_MEMCG
 760
 761         config KERNEL_MEMCG
 762                 bool "Memory Resource Controller for Control Groups"
 763                 default y
 764                 select KERNEL_FREEZER
 765                 depends on KERNEL_RESOURCE_COUNTERS
 766                 help
 767                   Provides a memory resource controller that manages both anonymous
 768                   memory and page cache. (See Documentation/cgroups/memory.txt)
 769
 770                   Note that setting this option increases fixed memory overhead
 771                   associated with each page of memory in the system. By this,
 772                   20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
 773                   usage tracking struct at boot. Total amount of this is printed out
 774                   at boot.
 775
 776                   Only enable when you're ok with these tradeoffs and really
 777                   sure you need the memory resource controller. Even when you enable
 778                   this, you can set "cgroup_disable=memory" at your boot option to
 779                   disable memory resource controller and you can avoid overheads
 780                   (but lose benefits of memory resource controller).
 781
 782                   This config option also selects MM_OWNER config option, which
 783                   could in turn add some fork/exit overhead.
 784
 785         config KERNEL_MEMCG_SWAP
 786                 bool "Memory Resource Controller Swap Extension"
 787                 default y
 788                 depends on KERNEL_MEMCG
 789                 help
 790                   Add swap management feature to memory resource controller. When you
 791                   enable this, you can limit mem+swap usage per cgroup. In other words,
 792                   when you disable this, memory resource controller has no cares to
 793                   usage of swap...a process can exhaust all of the swap. This extension
 794                   is useful when you want to avoid exhaustion swap but this itself
 795                   adds more overheads and consumes memory for remembering information.
 796                   Especially if you use 32bit system or small memory system, please
 797                   be careful about enabling this. When memory resource controller
 798                   is disabled by boot option, this will be automatically disabled and
 799                   there will be no overhead from this. Even when you set this config=y,
 800                   if boot option "swapaccount=0" is set, swap will not be accounted.
 801                   Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
 802                   size is 4096bytes, 512k per 1Gbytes of swap.
 803
 804         config KERNEL_MEMCG_SWAP_ENABLED
 805                 bool "Memory Resource Controller Swap Extension enabled by default"
 806                 depends on KERNEL_MEMCG_SWAP
 807                 help
 808                   Memory Resource Controller Swap Extension comes with its price in
 809                   a bigger memory consumption. General purpose distribution kernels
 810                   which want to enable the feature but keep it disabled by default
 811                   and let the user enable it by swapaccount boot command line
 812                   parameter should have this option unselected.
 813
 814                   Those who want to have the feature enabled by default should
 815                   select this option (if, for some reason, they need to disable it,
 816                   then swapaccount=0 does the trick).
 817
 818
 819         config KERNEL_MEMCG_KMEM
 820                 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
 821                 default y
 822                 depends on KERNEL_MEMCG
 823                 help
 824                   The Kernel Memory extension for Memory Resource Controller can limit
 825                   the amount of memory used by kernel objects in the system. Those are
 826                   fundamentally different from the entities handled by the standard
 827                   Memory Controller, which are page-based, and can be swapped. Users of
 828                   the kmem extension can use it to guarantee that no group of processes
 829                   will ever exhaust kernel resources alone.
 830
 831         config KERNEL_CGROUP_PERF
 832                 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
 833                 select KERNEL_PERF_EVENTS
 834                 help
 835                   This option extends the per-cpu mode to restrict monitoring to
 836                   threads which belong to the cgroup specified and run on the
 837                   designated cpu.
 838
 839         menuconfig KERNEL_CGROUP_SCHED
 840                 bool "Group CPU scheduler"
 841                 default y
 842                 help
 843                   This feature lets CPU scheduler recognize task groups and control CPU
 844                   bandwidth allocation to such task groups. It uses cgroups to group
 845                   tasks.
 846
 847         if KERNEL_CGROUP_SCHED
 848
 849                 config KERNEL_FAIR_GROUP_SCHED
 850                         bool "Group scheduling for SCHED_OTHER"
 851                         default y
 852
 853                 config KERNEL_CFS_BANDWIDTH
 854                         bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
 855                         default y
 856                         depends on KERNEL_FAIR_GROUP_SCHED
 857                         help
 858                           This option allows users to define CPU bandwidth rates (limits) for
 859                           tasks running within the fair group scheduler.  Groups with no limit
 860                           set are considered to be unconstrained and will run with no
 861                           restriction.
 862                           See tip/Documentation/scheduler/sched-bwc.txt for more information.
 863
 864                 config KERNEL_RT_GROUP_SCHED
 865                         bool "Group scheduling for SCHED_RR/FIFO"
 866                         default y
 867                         help
 868                           This feature lets you explicitly allocate real CPU bandwidth
 869                           to task groups. If enabled, it will also make it impossible to
 870                           schedule realtime tasks for non-root users until you allocate
 871                           realtime bandwidth for them.
 872
 873         endif
 874
 875         config KERNEL_BLK_CGROUP
 876                 bool "Block IO controller"
 877                 default y
 878                 help
 879                   Generic block IO controller cgroup interface. This is the common
 880                   cgroup interface which should be used by various IO controlling
 881                   policies.
 882
 883                   Currently, CFQ IO scheduler uses it to recognize task groups and
 884                   control disk bandwidth allocation (proportional time slice allocation)
 885                   to such task groups. It is also used by bio throttling logic in
 886                   block layer to implement upper limit in IO rates on a device.
 887
 888                   This option only enables generic Block IO controller infrastructure.
 889                   One needs to also enable actual IO controlling logic/policy. For
 890                   enabling proportional weight division of disk bandwidth in CFQ, set
 891                   CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
 892                   CONFIG_BLK_DEV_THROTTLING=y.
 893
 894         if KERNEL_BLK_CGROUP
 895
 896                 config KERNEL_CFQ_GROUP_IOSCHED
 897                         bool "Proportional weight of disk bandwidth in CFQ"
 898
 899                 config KERNEL_BLK_DEV_THROTTLING
 900                         bool "Enable throttling policy"
 901                         default y
 902
 903                 config KERNEL_BLK_DEV_THROTTLING_LOW
 904                         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 905                         depends on KERNEL_BLK_DEV_THROTTLING
 906         endif
 907
 908         config KERNEL_DEBUG_BLK_CGROUP
 909                 bool "Enable Block IO controller debugging"
 910                 depends on KERNEL_BLK_CGROUP
 911                 help
 912                   Enable some debugging help. Currently it exports additional stat
 913                   files in a cgroup which can be useful for debugging.
 914
 915         config KERNEL_NET_CLS_CGROUP
 916                 bool "legacy Control Group Classifier"
 917
 918         config KERNEL_CGROUP_NET_CLASSID
 919                 bool "legacy Network classid cgroup"
 920
 921         config KERNEL_CGROUP_NET_PRIO
 922                 bool "legacy Network priority cgroup"
 923
 924 endif
 925
 926 #
 927 # Namespace support symbols
 928 #
 929
 930 config KERNEL_NAMESPACES
 931         bool "Enable kernel namespaces"
 932         default y if !SMALL_FLASH
 933
 934 if KERNEL_NAMESPACES
 935
 936         config KERNEL_UTS_NS
 937                 bool "UTS namespace"
 938                 default y
 939                 help
 940                   In this namespace, tasks see different info provided
 941                   with the uname() system call.
 942
 943         config KERNEL_IPC_NS
 944                 bool "IPC namespace"
 945                 default y
 946                 help
 947                   In this namespace, tasks work with IPC ids which correspond to
 948                   different IPC objects in different namespaces.
 949
 950         config KERNEL_USER_NS
 951                 bool "User namespace (EXPERIMENTAL)"
 952                 default y
 953                 help
 954                   This allows containers, i.e. vservers, to use user namespaces
 955                   to provide different user info for different servers.
 956
 957         config KERNEL_PID_NS
 958                 bool "PID Namespaces"
 959                 default y
 960                 help
 961                   Support process id namespaces. This allows having multiple
 962                   processes with the same pid as long as they are in different
 963                   pid namespaces. This is a building block of containers.
 964
 965         config KERNEL_NET_NS
 966                 bool "Network namespace"
 967                 default y
 968                 help
 969                   Allow user space to create what appear to be multiple instances
 970                   of the network stack.
 971
 972 endif
 973
 974 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
 975         bool "Support multiple instances of devpts"
 976         default y if !SMALL_FLASH
 977         help
 978           Enable support for multiple instances of devpts filesystem.
 979           If you want to have isolated PTY namespaces (eg: in containers),
 980           say Y here. Otherwise, say N. If enabled, each mount of devpts
 981           filesystem with the '-o newinstance' option will create an
 982           independent PTY namespace.
 983
 984 config KERNEL_POSIX_MQUEUE
 985         bool "POSIX Message Queues"
 986         default y if !SMALL_FLASH
 987         help
 988           POSIX variant of message queues is a part of IPC. In POSIX message
 989           queues every message has a priority which decides about succession
 990           of receiving it by a process. If you want to compile and run
 991           programs written e.g. for Solaris with use of its POSIX message
 992           queues (functions mq_*) say Y here.
 993
 994           POSIX message queues are visible as a filesystem called 'mqueue'
 995           and can be mounted somewhere if you want to do filesystem
 996           operations on message queues.
 997
 998
 999 config KERNEL_SECCOMP_FILTER
1000         bool
1001         default y if !SMALL_FLASH
1002
1003 config KERNEL_SECCOMP
1004         bool "Enable seccomp support"
1005                 depends on !(TARGET_uml)
1006                 select KERNEL_SECCOMP_FILTER
1007                 default y if !SMALL_FLASH
1008                 help
1009                   Build kernel with support for seccomp.
1010
1011 #
1012 # IPv4 configuration
1013 #
1014
1015 config KERNEL_IP_MROUTE
1016         bool "Enable IPv4 multicast routing"
1017         default y
1018         help
1019           Multicast routing requires a multicast routing daemon in
1020           addition to kernel support.
1021
1022 if KERNEL_IP_MROUTE
1023
1024         config KERNEL_IP_MROUTE_MULTIPLE_TABLES
1025                 def_bool y
1026
1027         config KERNEL_IP_PIMSM_V1
1028                 def_bool y
1029
1030         config KERNEL_IP_PIMSM_V2
1031                 def_bool y
1032
1033 endif
1034
1035 #
1036 # IPv6 configuration
1037 #
1038
1039 config KERNEL_IPV6
1040         def_bool IPV6
1041
1042 if KERNEL_IPV6
1043
1044         config KERNEL_IPV6_MULTIPLE_TABLES
1045                 def_bool y
1046
1047         config KERNEL_IPV6_SUBTREES
1048                 def_bool y
1049
1050         config KERNEL_IPV6_MROUTE
1051                 bool "Enable IPv6 multicast routing"
1052                 default y
1053                 help
1054                   Multicast routing requires a multicast routing daemon in
1055                   addition to kernel support.
1056
1057         if KERNEL_IPV6_MROUTE
1058
1059                 config KERNEL_IPV6_MROUTE_MULTIPLE_TABLES
1060                         def_bool y
1061
1062                 config KERNEL_IPV6_PIMSM_V2
1063                         def_bool y
1064
1065         endif
1066
1067         config KERNEL_IPV6_SEG6_LWTUNNEL
1068                 bool "Enable support for lightweight tunnels"
1069                 default y if !SMALL_FLASH
1070                 help
1071                   Using lwtunnel (needed for IPv6 segment routing) requires ip-full package.
1072
1073         config KERNEL_LWTUNNEL_BPF
1074                 def_bool n
1075
1076 endif
1077
1078 #
1079 # Miscellaneous network configuration
1080 #
1081
1082 config KERNEL_NET_L3_MASTER_DEV
1083         bool "L3 Master device support"
1084         help
1085           This module provides glue between core networking code and device
1086           drivers to support L3 master devices like VRF.
1087
1088 config KERNEL_WIRELESS_EXT
1089         def_bool n
1090
1091 config KERNEL_WEXT_CORE
1092         def_bool KERNEL_WIRELESS_EXT
1093
1094 config KERNEL_WEXT_PRIV
1095         def_bool KERNEL_WIRELESS_EXT
1096
1097 config KERNEL_WEXT_PROC
1098         def_bool KERNEL_WIRELESS_EXT
1099
1100 config KERNEL_WEXT_SPY
1101         def_bool KERNEL_WIRELESS_EXT
1102
1103 config KERNEL_PAGE_POOL
1104         def_bool n
1105
1106 config KERNEL_PAGE_POOL_STATS
1107         bool "Page pool stats support"
1108         depends on KERNEL_PAGE_POOL
1109         depends on !LINUX_5_10
1110
1111 #
1112 # NFS related symbols
1113 #
1114 config KERNEL_IP_PNP
1115         bool "Compile the kernel with rootfs on NFS"
1116         help
1117            If you want to make your kernel boot off a NFS server as root
1118            filesystem, select Y here.
1119
1120 if KERNEL_IP_PNP
1121
1122         config KERNEL_IP_PNP_DHCP
1123                 def_bool y
1124
1125         config KERNEL_IP_PNP_BOOTP
1126                 def_bool n
1127
1128         config KERNEL_IP_PNP_RARP
1129                 def_bool n
1130
1131         config KERNEL_NFS_FS
1132                 def_bool y
1133
1134         config KERNEL_NFS_V2
1135                 def_bool y
1136
1137         config KERNEL_NFS_V3
1138                 def_bool y
1139
1140         config KERNEL_ROOT_NFS
1141                 def_bool y
1142
1143 endif
1144
1145 menu "Filesystem ACL and attr support options"
1146         config USE_FS_ACL_ATTR
1147                 bool "Use filesystem ACL and attr support by default"
1148                 help
1149                   Make using ACLs (e.g. POSIX ACL, NFSv4 ACL) the default
1150                   for kernel and packages, except tmpfs, flash filesystems,
1151                   and old NFS.  Also enable userspace extended attribute support
1152                   by default.  (OpenWrt already has an expection it will be
1153                   present in the kernel).
1154
1155         config KERNEL_FS_POSIX_ACL
1156                 bool "Enable POSIX ACL support"
1157                 default y if USE_FS_ACL_ATTR
1158
1159         config KERNEL_BTRFS_FS_POSIX_ACL
1160                 bool "Enable POSIX ACL for BtrFS Filesystems"
1161                 select KERNEL_FS_POSIX_ACL
1162                 default y if USE_FS_ACL_ATTR
1163
1164         config KERNEL_EXT4_FS_POSIX_ACL
1165                 bool "Enable POSIX ACL for Ext4 Filesystems"
1166                 select KERNEL_FS_POSIX_ACL
1167                 default y if USE_FS_ACL_ATTR
1168
1169         config KERNEL_F2FS_FS_POSIX_ACL
1170                 bool "Enable POSIX ACL for F2FS Filesystems"
1171                 select KERNEL_FS_POSIX_ACL
1172
1173         config KERNEL_JFFS2_FS_POSIX_ACL
1174                 bool "Enable POSIX ACL for JFFS2 Filesystems"
1175                 select KERNEL_FS_POSIX_ACL
1176
1177         config KERNEL_TMPFS_POSIX_ACL
1178                 bool "Enable POSIX ACL for TMPFS Filesystems"
1179                 select KERNEL_FS_POSIX_ACL
1180
1181         config KERNEL_CIFS_ACL
1182                 bool "Enable CIFS ACLs"
1183                 select KERNEL_FS_POSIX_ACL
1184                 default y if USE_FS_ACL_ATTR
1185
1186         config KERNEL_HFS_FS_POSIX_ACL
1187                 bool "Enable POSIX ACL for HFS Filesystems"
1188                 select KERNEL_FS_POSIX_ACL
1189                 default y if USE_FS_ACL_ATTR
1190
1191         config KERNEL_HFSPLUS_FS_POSIX_ACL
1192                 bool "Enable POSIX ACL for HFS+ Filesystems"
1193                 select KERNEL_FS_POSIX_ACL
1194                 default y if USE_FS_ACL_ATTR
1195
1196         config KERNEL_NFS_ACL_SUPPORT
1197                 bool "Enable ACLs for NFS"
1198                 default y if USE_FS_ACL_ATTR
1199
1200         config KERNEL_NFS_V3_ACL_SUPPORT
1201                 bool "Enable ACLs for NFSv3"
1202
1203         config KERNEL_NFSD_V2_ACL_SUPPORT
1204                 bool "Enable ACLs for NFSDv2"
1205
1206         config KERNEL_NFSD_V3_ACL_SUPPORT
1207                 bool "Enable ACLs for NFSDv3"
1208
1209         config KERNEL_REISER_FS_POSIX_ACL
1210                 bool "Enable POSIX ACLs for ReiserFS"
1211                 select KERNEL_FS_POSIX_ACL
1212                 default y if USE_FS_ACL_ATTR
1213
1214         config KERNEL_XFS_POSIX_ACL
1215                 bool "Enable POSIX ACLs for XFS"
1216                 select KERNEL_FS_POSIX_ACL
1217                 default y if USE_FS_ACL_ATTR
1218
1219         config KERNEL_JFS_POSIX_ACL
1220                 bool "Enable POSIX ACLs for JFS"
1221                 select KERNEL_FS_POSIX_ACL
1222                 default y if USE_FS_ACL_ATTR
1223
1224 endmenu
1225
1226 config KERNEL_DEVMEM
1227         bool "/dev/mem virtual device support"
1228         help
1229           Say Y here if you want to support the /dev/mem device.
1230           The /dev/mem device is used to access areas of physical
1231           memory.
1232
1233 config KERNEL_DEVKMEM
1234         bool "/dev/kmem virtual device support"
1235         help
1236           Say Y here if you want to support the /dev/kmem device. The
1237           /dev/kmem device is rarely used, but can be used for certain
1238           kind of kernel debugging operations.
1239
1240 config KERNEL_SQUASHFS_FRAGMENT_CACHE_SIZE
1241         int "Number of squashfs fragments cached"
1242         default 2 if (SMALL_FLASH && !LOW_MEMORY_FOOTPRINT)
1243         default 3
1244
1245 config KERNEL_SQUASHFS_XATTR
1246         bool "Squashfs XATTR support"
1247
1248 #
1249 # compile optimization setting
1250 #
1251 choice
1252         prompt "Compiler optimization level"
1253         default KERNEL_CC_OPTIMIZE_FOR_SIZE if SMALL_FLASH
1254
1255 config KERNEL_CC_OPTIMIZE_FOR_PERFORMANCE
1256         bool "Optimize for performance"
1257         help
1258           This is the default optimization level for the kernel, building
1259           with the "-O2" compiler flag for best performance and most
1260           helpful compile-time warnings.
1261
1262 config KERNEL_CC_OPTIMIZE_FOR_SIZE
1263         bool "Optimize for size"
1264         help
1265           Enabling this option will pass "-Os" instead of "-O2" to
1266           your compiler resulting in a smaller kernel.
1267
1268 endchoice
1269
1270 config KERNEL_AUDIT
1271         bool "Auditing support"
1272
1273 config KERNEL_SECURITY
1274         bool "Enable different security models"
1275
1276 config KERNEL_SECURITY_NETWORK
1277         bool "Socket and Networking Security Hooks"
1278         select KERNEL_SECURITY
1279
1280 config KERNEL_SECURITY_SELINUX
1281         bool "NSA SELinux Support"
1282         select KERNEL_SECURITY_NETWORK
1283         select KERNEL_AUDIT
1284
1285 config KERNEL_SECURITY_SELINUX_BOOTPARAM
1286         bool "NSA SELinux boot parameter"
1287         depends on KERNEL_SECURITY_SELINUX
1288         default y
1289
1290 config KERNEL_SECURITY_SELINUX_DISABLE
1291         bool "NSA SELinux runtime disable"
1292         depends on KERNEL_SECURITY_SELINUX
1293
1294 config KERNEL_SECURITY_SELINUX_DEVELOP
1295         bool "NSA SELinux Development Support"
1296         depends on KERNEL_SECURITY_SELINUX
1297         default y
1298
1299 config KERNEL_SECURITY_SELINUX_SIDTAB_HASH_BITS
1300         int
1301         depends on KERNEL_SECURITY_SELINUX
1302         default 9
1303
1304 config KERNEL_SECURITY_SELINUX_SID2STR_CACHE_SIZE
1305         int
1306         depends on KERNEL_SECURITY_SELINUX
1307         default 256
1308
1309 config KERNEL_LSM
1310         string
1311         default "lockdown,yama,loadpin,safesetid,integrity,selinux"
1312         depends on KERNEL_SECURITY_SELINUX
1313
1314 config KERNEL_EXT4_FS_SECURITY
1315         bool "Ext4 Security Labels"
1316
1317 config KERNEL_F2FS_FS_SECURITY
1318         bool "F2FS Security Labels"
1319
1320 config KERNEL_UBIFS_FS_SECURITY
1321         bool "UBIFS Security Labels"
1322
1323 config KERNEL_JFFS2_FS_SECURITY
1324         bool "JFFS2 Security Labels"