1# SPDX-License-Identifier: GPL-2.0 2config LOONGARCH 3 bool 4 default y 5 select ACPI 6 select ACPI_GENERIC_GSI if ACPI 7 select ACPI_MCFG if ACPI 8 select ACPI_PPTT if ACPI 9 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 10 select ARCH_BINFMT_ELF_STATE 11 select ARCH_DISABLE_KASAN_INLINE 12 select ARCH_ENABLE_MEMORY_HOTPLUG 13 select ARCH_ENABLE_MEMORY_HOTREMOVE 14 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 15 select ARCH_HAS_CPU_FINALIZE_INIT 16 select ARCH_HAS_FORTIFY_SOURCE 17 select ARCH_HAS_KCOV 18 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 19 select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 20 select ARCH_HAS_PTE_SPECIAL 21 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 22 select ARCH_INLINE_READ_LOCK if !PREEMPTION 23 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 24 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 25 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 26 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 27 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 28 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 29 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 30 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 31 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 32 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 33 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 34 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 35 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 36 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 37 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 38 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 39 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 40 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 41 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 42 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 43 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 44 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 45 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 46 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 47 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 48 select ARCH_KEEP_MEMBLOCK 49 select ARCH_MIGHT_HAVE_PC_PARPORT 50 select ARCH_MIGHT_HAVE_PC_SERIO 51 select ARCH_SPARSEMEM_ENABLE 52 select ARCH_STACKWALK 53 select ARCH_SUPPORTS_ACPI 54 select ARCH_SUPPORTS_ATOMIC_RMW 55 select ARCH_SUPPORTS_HUGETLBFS 56 select ARCH_SUPPORTS_LTO_CLANG 57 select ARCH_SUPPORTS_LTO_CLANG_THIN 58 select ARCH_SUPPORTS_NUMA_BALANCING 59 select ARCH_USE_BUILTIN_BSWAP 60 select ARCH_USE_CMPXCHG_LOCKREF 61 select ARCH_USE_QUEUED_RWLOCKS 62 select ARCH_USE_QUEUED_SPINLOCKS 63 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 64 select ARCH_WANT_LD_ORPHAN_WARN 65 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 66 select ARCH_WANTS_NO_INSTR 67 select BUILDTIME_TABLE_SORT 68 select COMMON_CLK 69 select CPU_PM 70 select EFI 71 select GENERIC_CLOCKEVENTS 72 select GENERIC_CMOS_UPDATE 73 select GENERIC_CPU_AUTOPROBE 74 select GENERIC_ENTRY 75 select GENERIC_GETTIMEOFDAY 76 select GENERIC_IOREMAP if !ARCH_IOREMAP 77 select GENERIC_IRQ_MULTI_HANDLER 78 select GENERIC_IRQ_PROBE 79 select GENERIC_IRQ_SHOW 80 select GENERIC_LIB_ASHLDI3 81 select GENERIC_LIB_ASHRDI3 82 select GENERIC_LIB_CMPDI2 83 select GENERIC_LIB_LSHRDI3 84 select GENERIC_LIB_UCMPDI2 85 select GENERIC_LIB_DEVMEM_IS_ALLOWED 86 select GENERIC_PCI_IOMAP 87 select GENERIC_SCHED_CLOCK 88 select GENERIC_SMP_IDLE_THREAD 89 select GENERIC_TIME_VSYSCALL 90 select GENERIC_VDSO_TIME_NS 91 select GPIOLIB 92 select HAS_IOPORT 93 select HAVE_ARCH_AUDITSYSCALL 94 select HAVE_ARCH_JUMP_LABEL 95 select HAVE_ARCH_JUMP_LABEL_RELATIVE 96 select HAVE_ARCH_KASAN 97 select HAVE_ARCH_KFENCE 98 select HAVE_ARCH_KGDB if PERF_EVENTS 99 select HAVE_ARCH_MMAP_RND_BITS if MMU 100 select HAVE_ARCH_SECCOMP_FILTER 101 select HAVE_ARCH_TRACEHOOK 102 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 103 select HAVE_ASM_MODVERSIONS 104 select HAVE_CONTEXT_TRACKING_USER 105 select HAVE_C_RECORDMCOUNT 106 select HAVE_DEBUG_KMEMLEAK 107 select HAVE_DEBUG_STACKOVERFLOW 108 select HAVE_DMA_CONTIGUOUS 109 select HAVE_DYNAMIC_FTRACE 110 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 111 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 112 select HAVE_DYNAMIC_FTRACE_WITH_REGS 113 select HAVE_EBPF_JIT 114 select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN 115 select HAVE_EXIT_THREAD 116 select HAVE_FAST_GUP 117 select HAVE_FTRACE_MCOUNT_RECORD 118 select HAVE_FUNCTION_ARG_ACCESS_API 119 select HAVE_FUNCTION_ERROR_INJECTION 120 select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER 121 select HAVE_FUNCTION_GRAPH_TRACER 122 select HAVE_FUNCTION_TRACER 123 select HAVE_GCC_PLUGINS 124 select HAVE_GENERIC_VDSO 125 select HAVE_HW_BREAKPOINT if PERF_EVENTS 126 select HAVE_IOREMAP_PROT 127 select HAVE_IRQ_EXIT_ON_IRQ_STACK 128 select HAVE_IRQ_TIME_ACCOUNTING 129 select HAVE_KPROBES 130 select HAVE_KPROBES_ON_FTRACE 131 select HAVE_KRETPROBES 132 select HAVE_MOD_ARCH_SPECIFIC 133 select HAVE_NMI 134 select HAVE_PCI 135 select HAVE_PERF_EVENTS 136 select HAVE_PERF_REGS 137 select HAVE_PERF_USER_STACK_DUMP 138 select HAVE_REGS_AND_STACK_ACCESS_API 139 select HAVE_RETHOOK 140 select HAVE_RSEQ 141 select HAVE_SAMPLE_FTRACE_DIRECT 142 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 143 select HAVE_SETUP_PER_CPU_AREA if NUMA 144 select HAVE_STACKPROTECTOR 145 select HAVE_SYSCALL_TRACEPOINTS 146 select HAVE_TIF_NOHZ 147 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 148 select IRQ_FORCED_THREADING 149 select IRQ_LOONGARCH_CPU 150 select LOCK_MM_AND_FIND_VMA 151 select MMU_GATHER_MERGE_VMAS if MMU 152 select MODULES_USE_ELF_RELA if MODULES 153 select NEED_PER_CPU_EMBED_FIRST_CHUNK 154 select NEED_PER_CPU_PAGE_FIRST_CHUNK 155 select OF 156 select OF_EARLY_FLATTREE 157 select PCI 158 select PCI_DOMAINS_GENERIC 159 select PCI_ECAM if ACPI 160 select PCI_LOONGSON 161 select PCI_MSI_ARCH_FALLBACKS 162 select PCI_QUIRKS 163 select PERF_USE_VMALLOC 164 select RTC_LIB 165 select SMP 166 select SPARSE_IRQ 167 select SYSCTL_ARCH_UNALIGN_ALLOW 168 select SYSCTL_ARCH_UNALIGN_NO_WARN 169 select SYSCTL_EXCEPTION_TRACE 170 select SWIOTLB 171 select TRACE_IRQFLAGS_SUPPORT 172 select USE_PERCPU_NUMA_NODE_ID 173 select USER_STACKTRACE_SUPPORT 174 select ZONE_DMA32 175 176config 32BIT 177 bool 178 179config 64BIT 180 def_bool y 181 182config GENERIC_BUG 183 def_bool y 184 depends on BUG 185 186config GENERIC_BUG_RELATIVE_POINTERS 187 def_bool y 188 depends on GENERIC_BUG 189 190config GENERIC_CALIBRATE_DELAY 191 def_bool y 192 193config GENERIC_CSUM 194 def_bool y 195 196config GENERIC_HWEIGHT 197 def_bool y 198 199config L1_CACHE_SHIFT 200 int 201 default "6" 202 203config LOCKDEP_SUPPORT 204 bool 205 default y 206 207config STACKTRACE_SUPPORT 208 bool 209 default y 210 211# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 212# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 213# are shared between architectures, and specifically expecting the symbols. 214config MACH_LOONGSON32 215 def_bool 32BIT 216 217config MACH_LOONGSON64 218 def_bool 64BIT 219 220config FIX_EARLYCON_MEM 221 def_bool y 222 223config PAGE_SIZE_4KB 224 bool 225 226config PAGE_SIZE_16KB 227 bool 228 229config PAGE_SIZE_64KB 230 bool 231 232config PGTABLE_2LEVEL 233 bool 234 235config PGTABLE_3LEVEL 236 bool 237 238config PGTABLE_4LEVEL 239 bool 240 241config PGTABLE_LEVELS 242 int 243 default 2 if PGTABLE_2LEVEL 244 default 3 if PGTABLE_3LEVEL 245 default 4 if PGTABLE_4LEVEL 246 247config SCHED_OMIT_FRAME_POINTER 248 bool 249 default y 250 251config AS_HAS_EXPLICIT_RELOCS 252 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 253 254config AS_HAS_FCSR_CLASS 255 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 256 257config AS_HAS_LSX_EXTENSION 258 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 259 260config AS_HAS_LASX_EXTENSION 261 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 262 263config AS_HAS_LBT_EXTENSION 264 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 265 266menu "Kernel type and options" 267 268source "kernel/Kconfig.hz" 269 270choice 271 prompt "Page Table Layout" 272 default 16KB_2LEVEL if 32BIT 273 default 16KB_3LEVEL if 64BIT 274 help 275 Allows choosing the page table layout, which is a combination 276 of page size and page table levels. The size of virtual memory 277 address space are determined by the page table layout. 278 279config 4KB_3LEVEL 280 bool "4KB with 3 levels" 281 select PAGE_SIZE_4KB 282 select PGTABLE_3LEVEL 283 help 284 This option selects 4KB page size with 3 level page tables, which 285 support a maximum of 39 bits of application virtual memory. 286 287config 4KB_4LEVEL 288 bool "4KB with 4 levels" 289 select PAGE_SIZE_4KB 290 select PGTABLE_4LEVEL 291 help 292 This option selects 4KB page size with 4 level page tables, which 293 support a maximum of 48 bits of application virtual memory. 294 295config 16KB_2LEVEL 296 bool "16KB with 2 levels" 297 select PAGE_SIZE_16KB 298 select PGTABLE_2LEVEL 299 help 300 This option selects 16KB page size with 2 level page tables, which 301 support a maximum of 36 bits of application virtual memory. 302 303config 16KB_3LEVEL 304 bool "16KB with 3 levels" 305 select PAGE_SIZE_16KB 306 select PGTABLE_3LEVEL 307 help 308 This option selects 16KB page size with 3 level page tables, which 309 support a maximum of 47 bits of application virtual memory. 310 311config 64KB_2LEVEL 312 bool "64KB with 2 levels" 313 select PAGE_SIZE_64KB 314 select PGTABLE_2LEVEL 315 help 316 This option selects 64KB page size with 2 level page tables, which 317 support a maximum of 42 bits of application virtual memory. 318 319config 64KB_3LEVEL 320 bool "64KB with 3 levels" 321 select PAGE_SIZE_64KB 322 select PGTABLE_3LEVEL 323 help 324 This option selects 64KB page size with 3 level page tables, which 325 support a maximum of 55 bits of application virtual memory. 326 327endchoice 328 329config CMDLINE 330 string "Built-in kernel command line" 331 help 332 For most platforms, the arguments for the kernel's command line 333 are provided at run-time, during boot. However, there are cases 334 where either no arguments are being provided or the provided 335 arguments are insufficient or even invalid. 336 337 When that occurs, it is possible to define a built-in command 338 line here and choose how the kernel should use it later on. 339 340choice 341 prompt "Kernel command line type" 342 default CMDLINE_BOOTLOADER 343 help 344 Choose how the kernel will handle the provided built-in command 345 line. 346 347config CMDLINE_BOOTLOADER 348 bool "Use bootloader kernel arguments if available" 349 help 350 Prefer the command-line passed by the boot loader if available. 351 Use the built-in command line as fallback in case we get nothing 352 during boot. This is the default behaviour. 353 354config CMDLINE_EXTEND 355 bool "Use built-in to extend bootloader kernel arguments" 356 help 357 The command-line arguments provided during boot will be 358 appended to the built-in command line. This is useful in 359 cases where the provided arguments are insufficient and 360 you don't want to or cannot modify them. 361 362config CMDLINE_FORCE 363 bool "Always use the built-in kernel command string" 364 help 365 Always use the built-in command line, even if we get one during 366 boot. This is useful in case you need to override the provided 367 command line on systems where you don't have or want control 368 over it. 369 370endchoice 371 372config DMI 373 bool "Enable DMI scanning" 374 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 375 default y 376 help 377 This enables SMBIOS/DMI feature for systems, and scanning of 378 DMI to identify machine quirks. 379 380config EFI 381 bool "EFI runtime service support" 382 select UCS2_STRING 383 select EFI_RUNTIME_WRAPPERS 384 help 385 This enables the kernel to use EFI runtime services that are 386 available (such as the EFI variable services). 387 388config EFI_STUB 389 bool "EFI boot stub support" 390 default y 391 depends on EFI 392 select EFI_GENERIC_STUB 393 help 394 This kernel feature allows the kernel to be loaded directly by 395 EFI firmware without the use of a bootloader. 396 397config SCHED_SMT 398 bool "SMT scheduler support" 399 default y 400 help 401 Improves scheduler's performance when there are multiple 402 threads in one physical core. 403 404config SMP 405 bool "Multi-Processing support" 406 help 407 This enables support for systems with more than one CPU. If you have 408 a system with only one CPU, say N. If you have a system with more 409 than one CPU, say Y. 410 411 If you say N here, the kernel will run on uni- and multiprocessor 412 machines, but will use only one CPU of a multiprocessor machine. If 413 you say Y here, the kernel will run on many, but not all, 414 uniprocessor machines. On a uniprocessor machine, the kernel 415 will run faster if you say N here. 416 417 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 418 419 If you don't know what to do here, say N. 420 421config HOTPLUG_CPU 422 bool "Support for hot-pluggable CPUs" 423 depends on SMP 424 select GENERIC_IRQ_MIGRATION 425 help 426 Say Y here to allow turning CPUs off and on. CPUs can be 427 controlled through /sys/devices/system/cpu. 428 (Note: power management support will enable this option 429 automatically on SMP systems. ) 430 Say N if you want to disable CPU hotplug. 431 432config NR_CPUS 433 int "Maximum number of CPUs (2-256)" 434 range 2 256 435 depends on SMP 436 default "64" 437 help 438 This allows you to specify the maximum number of CPUs which this 439 kernel will support. 440 441config NUMA 442 bool "NUMA Support" 443 select SMP 444 select ACPI_NUMA if ACPI 445 help 446 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 447 support. This option improves performance on systems with more 448 than one NUMA node; on single node systems it is generally better 449 to leave it disabled. 450 451config NODES_SHIFT 452 int 453 default "6" 454 depends on NUMA 455 456config ARCH_FORCE_MAX_ORDER 457 int "Maximum zone order" 458 default "13" if PAGE_SIZE_64KB 459 default "11" if PAGE_SIZE_16KB 460 default "10" 461 help 462 The kernel memory allocator divides physically contiguous memory 463 blocks into "zones", where each zone is a power of two number of 464 pages. This option selects the largest power of two that the kernel 465 keeps in the memory allocator. If you need to allocate very large 466 blocks of physically contiguous memory, then you may need to 467 increase this value. 468 469 The page size is not necessarily 4KB. Keep this in mind 470 when choosing a value for this option. 471 472config ARCH_IOREMAP 473 bool "Enable LoongArch DMW-based ioremap()" 474 help 475 We use generic TLB-based ioremap() by default since it has page 476 protection support. However, you can enable LoongArch DMW-based 477 ioremap() for better performance. 478 479config ARCH_WRITECOMBINE 480 bool "Enable WriteCombine (WUC) for ioremap()" 481 help 482 LoongArch maintains cache coherency in hardware, but when paired 483 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 484 is similar to WriteCombine) is out of the scope of cache coherency 485 machanism for PCIe devices (this is a PCIe protocol violation, which 486 may be fixed in newer chipsets). 487 488 This means WUC can only used for write-only memory regions now, so 489 this option is disabled by default, making WUC silently fallback to 490 SUC for ioremap(). You can enable this option if the kernel is ensured 491 to run on hardware without this bug. 492 493 You can override this setting via writecombine=on/off boot parameter. 494 495config ARCH_STRICT_ALIGN 496 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 497 default y 498 help 499 Not all LoongArch cores support h/w unaligned access, we can use 500 -mstrict-align build parameter to prevent unaligned accesses. 501 502 CPUs with h/w unaligned access support: 503 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 504 505 CPUs without h/w unaligned access support: 506 Loongson-2K500/2K1000. 507 508 This option is enabled by default to make the kernel be able to run 509 on all LoongArch systems. But you can disable it manually if you want 510 to run kernel only on systems with h/w unaligned access support in 511 order to optimise for performance. 512 513config CPU_HAS_FPU 514 bool 515 default y 516 517config CPU_HAS_LSX 518 bool "Support for the Loongson SIMD Extension" 519 depends on AS_HAS_LSX_EXTENSION 520 help 521 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 522 and a set of SIMD instructions to operate on them. When this option 523 is enabled the kernel will support allocating & switching LSX 524 vector register contexts. If you know that your kernel will only be 525 running on CPUs which do not support LSX or that your userland will 526 not be making use of it then you may wish to say N here to reduce 527 the size & complexity of your kernel. 528 529 If unsure, say Y. 530 531config CPU_HAS_LASX 532 bool "Support for the Loongson Advanced SIMD Extension" 533 depends on CPU_HAS_LSX 534 depends on AS_HAS_LASX_EXTENSION 535 help 536 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 537 registers and a set of SIMD instructions to operate on them. When this 538 option is enabled the kernel will support allocating & switching LASX 539 vector register contexts. If you know that your kernel will only be 540 running on CPUs which do not support LASX or that your userland will 541 not be making use of it then you may wish to say N here to reduce 542 the size & complexity of your kernel. 543 544 If unsure, say Y. 545 546config CPU_HAS_LBT 547 bool "Support for the Loongson Binary Translation Extension" 548 depends on AS_HAS_LBT_EXTENSION 549 help 550 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 551 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 552 Enabling this option allows the kernel to allocate and switch registers 553 specific to LBT. 554 555 If you want to use this feature, such as the Loongson Architecture 556 Translator (LAT), say Y. 557 558config CPU_HAS_PREFETCH 559 bool 560 default y 561 562config ARCH_SUPPORTS_KEXEC 563 def_bool y 564 565config ARCH_SUPPORTS_CRASH_DUMP 566 def_bool y 567 568config ARCH_SELECTS_CRASH_DUMP 569 def_bool y 570 depends on CRASH_DUMP 571 select RELOCATABLE 572 573config RELOCATABLE 574 bool "Relocatable kernel" 575 help 576 This builds the kernel as a Position Independent Executable (PIE), 577 which retains all relocation metadata required, so as to relocate 578 the kernel binary at runtime to a different virtual address from 579 its link address. 580 581config RANDOMIZE_BASE 582 bool "Randomize the address of the kernel (KASLR)" 583 depends on RELOCATABLE 584 help 585 Randomizes the physical and virtual address at which the 586 kernel image is loaded, as a security feature that 587 deters exploit attempts relying on knowledge of the location 588 of kernel internals. 589 590 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 591 592 If unsure, say N. 593 594config RANDOMIZE_BASE_MAX_OFFSET 595 hex "Maximum KASLR offset" if EXPERT 596 depends on RANDOMIZE_BASE 597 range 0x0 0x10000000 598 default "0x01000000" 599 help 600 When KASLR is active, this provides the maximum offset that will 601 be applied to the kernel image. It should be set according to the 602 amount of physical RAM available in the target system. 603 604 This is limited by the size of the lower address memory, 256MB. 605 606config SECCOMP 607 bool "Enable seccomp to safely compute untrusted bytecode" 608 depends on PROC_FS 609 default y 610 help 611 This kernel feature is useful for number crunching applications 612 that may need to compute untrusted bytecode during their 613 execution. By using pipes or other transports made available to 614 the process as file descriptors supporting the read/write 615 syscalls, it's possible to isolate those applications in 616 their own address space using seccomp. Once seccomp is 617 enabled via /proc/<pid>/seccomp, it cannot be disabled 618 and the task is only allowed to execute a few safe syscalls 619 defined by each seccomp mode. 620 621 If unsure, say Y. Only embedded should say N here. 622 623endmenu 624 625config ARCH_SELECT_MEMORY_MODEL 626 def_bool y 627 628config ARCH_FLATMEM_ENABLE 629 def_bool y 630 depends on !NUMA 631 632config ARCH_SPARSEMEM_ENABLE 633 def_bool y 634 select SPARSEMEM_VMEMMAP_ENABLE 635 help 636 Say Y to support efficient handling of sparse physical memory, 637 for architectures which are either NUMA (Non-Uniform Memory Access) 638 or have huge holes in the physical address space for other reasons. 639 See <file:Documentation/mm/numa.rst> for more. 640 641config ARCH_ENABLE_THP_MIGRATION 642 def_bool y 643 depends on TRANSPARENT_HUGEPAGE 644 645config ARCH_MEMORY_PROBE 646 def_bool y 647 depends on MEMORY_HOTPLUG 648 649config MMU 650 bool 651 default y 652 653config ARCH_MMAP_RND_BITS_MIN 654 default 12 655 656config ARCH_MMAP_RND_BITS_MAX 657 default 18 658 659config ARCH_SUPPORTS_UPROBES 660 def_bool y 661 662config KASAN_SHADOW_OFFSET 663 hex 664 default 0x0 665 depends on KASAN 666 667menu "Power management options" 668 669config ARCH_SUSPEND_POSSIBLE 670 def_bool y 671 672config ARCH_HIBERNATION_POSSIBLE 673 def_bool y 674 675source "kernel/power/Kconfig" 676source "drivers/acpi/Kconfig" 677 678endmenu 679