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_KVM 133 select HAVE_MOD_ARCH_SPECIFIC 134 select HAVE_NMI 135 select HAVE_PCI 136 select HAVE_PERF_EVENTS 137 select HAVE_PERF_REGS 138 select HAVE_PERF_USER_STACK_DUMP 139 select HAVE_REGS_AND_STACK_ACCESS_API 140 select HAVE_RETHOOK 141 select HAVE_RSEQ 142 select HAVE_SAMPLE_FTRACE_DIRECT 143 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 144 select HAVE_SETUP_PER_CPU_AREA if NUMA 145 select HAVE_STACKPROTECTOR 146 select HAVE_SYSCALL_TRACEPOINTS 147 select HAVE_TIF_NOHZ 148 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 149 select IRQ_FORCED_THREADING 150 select IRQ_LOONGARCH_CPU 151 select LOCK_MM_AND_FIND_VMA 152 select MMU_GATHER_MERGE_VMAS if MMU 153 select MODULES_USE_ELF_RELA if MODULES 154 select NEED_PER_CPU_EMBED_FIRST_CHUNK 155 select NEED_PER_CPU_PAGE_FIRST_CHUNK 156 select OF 157 select OF_EARLY_FLATTREE 158 select PCI 159 select PCI_DOMAINS_GENERIC 160 select PCI_ECAM if ACPI 161 select PCI_LOONGSON 162 select PCI_MSI_ARCH_FALLBACKS 163 select PCI_QUIRKS 164 select PERF_USE_VMALLOC 165 select RTC_LIB 166 select SMP 167 select SPARSE_IRQ 168 select SYSCTL_ARCH_UNALIGN_ALLOW 169 select SYSCTL_ARCH_UNALIGN_NO_WARN 170 select SYSCTL_EXCEPTION_TRACE 171 select SWIOTLB 172 select TRACE_IRQFLAGS_SUPPORT 173 select USE_PERCPU_NUMA_NODE_ID 174 select USER_STACKTRACE_SUPPORT 175 select ZONE_DMA32 176 177config 32BIT 178 bool 179 180config 64BIT 181 def_bool y 182 183config GENERIC_BUG 184 def_bool y 185 depends on BUG 186 187config GENERIC_BUG_RELATIVE_POINTERS 188 def_bool y 189 depends on GENERIC_BUG 190 191config GENERIC_CALIBRATE_DELAY 192 def_bool y 193 194config GENERIC_CSUM 195 def_bool y 196 197config GENERIC_HWEIGHT 198 def_bool y 199 200config L1_CACHE_SHIFT 201 int 202 default "6" 203 204config LOCKDEP_SUPPORT 205 bool 206 default y 207 208config STACKTRACE_SUPPORT 209 bool 210 default y 211 212# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 213# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 214# are shared between architectures, and specifically expecting the symbols. 215config MACH_LOONGSON32 216 def_bool 32BIT 217 218config MACH_LOONGSON64 219 def_bool 64BIT 220 221config FIX_EARLYCON_MEM 222 def_bool y 223 224config PAGE_SIZE_4KB 225 bool 226 227config PAGE_SIZE_16KB 228 bool 229 230config PAGE_SIZE_64KB 231 bool 232 233config PGTABLE_2LEVEL 234 bool 235 236config PGTABLE_3LEVEL 237 bool 238 239config PGTABLE_4LEVEL 240 bool 241 242config PGTABLE_LEVELS 243 int 244 default 2 if PGTABLE_2LEVEL 245 default 3 if PGTABLE_3LEVEL 246 default 4 if PGTABLE_4LEVEL 247 248config SCHED_OMIT_FRAME_POINTER 249 bool 250 default y 251 252config AS_HAS_EXPLICIT_RELOCS 253 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 254 255config AS_HAS_FCSR_CLASS 256 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 257 258config AS_HAS_LSX_EXTENSION 259 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 260 261config AS_HAS_LASX_EXTENSION 262 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 263 264config AS_HAS_LBT_EXTENSION 265 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 266 267config AS_HAS_LVZ_EXTENSION 268 def_bool $(as-instr,hvcl 0) 269 270menu "Kernel type and options" 271 272source "kernel/Kconfig.hz" 273 274choice 275 prompt "Page Table Layout" 276 default 16KB_2LEVEL if 32BIT 277 default 16KB_3LEVEL if 64BIT 278 help 279 Allows choosing the page table layout, which is a combination 280 of page size and page table levels. The size of virtual memory 281 address space are determined by the page table layout. 282 283config 4KB_3LEVEL 284 bool "4KB with 3 levels" 285 select PAGE_SIZE_4KB 286 select PGTABLE_3LEVEL 287 help 288 This option selects 4KB page size with 3 level page tables, which 289 support a maximum of 39 bits of application virtual memory. 290 291config 4KB_4LEVEL 292 bool "4KB with 4 levels" 293 select PAGE_SIZE_4KB 294 select PGTABLE_4LEVEL 295 help 296 This option selects 4KB page size with 4 level page tables, which 297 support a maximum of 48 bits of application virtual memory. 298 299config 16KB_2LEVEL 300 bool "16KB with 2 levels" 301 select PAGE_SIZE_16KB 302 select PGTABLE_2LEVEL 303 help 304 This option selects 16KB page size with 2 level page tables, which 305 support a maximum of 36 bits of application virtual memory. 306 307config 16KB_3LEVEL 308 bool "16KB with 3 levels" 309 select PAGE_SIZE_16KB 310 select PGTABLE_3LEVEL 311 help 312 This option selects 16KB page size with 3 level page tables, which 313 support a maximum of 47 bits of application virtual memory. 314 315config 64KB_2LEVEL 316 bool "64KB with 2 levels" 317 select PAGE_SIZE_64KB 318 select PGTABLE_2LEVEL 319 help 320 This option selects 64KB page size with 2 level page tables, which 321 support a maximum of 42 bits of application virtual memory. 322 323config 64KB_3LEVEL 324 bool "64KB with 3 levels" 325 select PAGE_SIZE_64KB 326 select PGTABLE_3LEVEL 327 help 328 This option selects 64KB page size with 3 level page tables, which 329 support a maximum of 55 bits of application virtual memory. 330 331endchoice 332 333config CMDLINE 334 string "Built-in kernel command line" 335 help 336 For most platforms, the arguments for the kernel's command line 337 are provided at run-time, during boot. However, there are cases 338 where either no arguments are being provided or the provided 339 arguments are insufficient or even invalid. 340 341 When that occurs, it is possible to define a built-in command 342 line here and choose how the kernel should use it later on. 343 344choice 345 prompt "Kernel command line type" 346 default CMDLINE_BOOTLOADER 347 help 348 Choose how the kernel will handle the provided built-in command 349 line. 350 351config CMDLINE_BOOTLOADER 352 bool "Use bootloader kernel arguments if available" 353 help 354 Prefer the command-line passed by the boot loader if available. 355 Use the built-in command line as fallback in case we get nothing 356 during boot. This is the default behaviour. 357 358config CMDLINE_EXTEND 359 bool "Use built-in to extend bootloader kernel arguments" 360 help 361 The command-line arguments provided during boot will be 362 appended to the built-in command line. This is useful in 363 cases where the provided arguments are insufficient and 364 you don't want to or cannot modify them. 365 366config CMDLINE_FORCE 367 bool "Always use the built-in kernel command string" 368 help 369 Always use the built-in command line, even if we get one during 370 boot. This is useful in case you need to override the provided 371 command line on systems where you don't have or want control 372 over it. 373 374endchoice 375 376config DMI 377 bool "Enable DMI scanning" 378 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 379 default y 380 help 381 This enables SMBIOS/DMI feature for systems, and scanning of 382 DMI to identify machine quirks. 383 384config EFI 385 bool "EFI runtime service support" 386 select UCS2_STRING 387 select EFI_RUNTIME_WRAPPERS 388 help 389 This enables the kernel to use EFI runtime services that are 390 available (such as the EFI variable services). 391 392config EFI_STUB 393 bool "EFI boot stub support" 394 default y 395 depends on EFI 396 select EFI_GENERIC_STUB 397 help 398 This kernel feature allows the kernel to be loaded directly by 399 EFI firmware without the use of a bootloader. 400 401config SCHED_SMT 402 bool "SMT scheduler support" 403 default y 404 help 405 Improves scheduler's performance when there are multiple 406 threads in one physical core. 407 408config SMP 409 bool "Multi-Processing support" 410 help 411 This enables support for systems with more than one CPU. If you have 412 a system with only one CPU, say N. If you have a system with more 413 than one CPU, say Y. 414 415 If you say N here, the kernel will run on uni- and multiprocessor 416 machines, but will use only one CPU of a multiprocessor machine. If 417 you say Y here, the kernel will run on many, but not all, 418 uniprocessor machines. On a uniprocessor machine, the kernel 419 will run faster if you say N here. 420 421 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 422 423 If you don't know what to do here, say N. 424 425config HOTPLUG_CPU 426 bool "Support for hot-pluggable CPUs" 427 depends on SMP 428 select GENERIC_IRQ_MIGRATION 429 help 430 Say Y here to allow turning CPUs off and on. CPUs can be 431 controlled through /sys/devices/system/cpu. 432 (Note: power management support will enable this option 433 automatically on SMP systems. ) 434 Say N if you want to disable CPU hotplug. 435 436config NR_CPUS 437 int "Maximum number of CPUs (2-256)" 438 range 2 256 439 depends on SMP 440 default "64" 441 help 442 This allows you to specify the maximum number of CPUs which this 443 kernel will support. 444 445config NUMA 446 bool "NUMA Support" 447 select SMP 448 select ACPI_NUMA if ACPI 449 help 450 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 451 support. This option improves performance on systems with more 452 than one NUMA node; on single node systems it is generally better 453 to leave it disabled. 454 455config NODES_SHIFT 456 int 457 default "6" 458 depends on NUMA 459 460config ARCH_FORCE_MAX_ORDER 461 int "Maximum zone order" 462 default "13" if PAGE_SIZE_64KB 463 default "11" if PAGE_SIZE_16KB 464 default "10" 465 help 466 The kernel memory allocator divides physically contiguous memory 467 blocks into "zones", where each zone is a power of two number of 468 pages. This option selects the largest power of two that the kernel 469 keeps in the memory allocator. If you need to allocate very large 470 blocks of physically contiguous memory, then you may need to 471 increase this value. 472 473 The page size is not necessarily 4KB. Keep this in mind 474 when choosing a value for this option. 475 476config ARCH_IOREMAP 477 bool "Enable LoongArch DMW-based ioremap()" 478 help 479 We use generic TLB-based ioremap() by default since it has page 480 protection support. However, you can enable LoongArch DMW-based 481 ioremap() for better performance. 482 483config ARCH_WRITECOMBINE 484 bool "Enable WriteCombine (WUC) for ioremap()" 485 help 486 LoongArch maintains cache coherency in hardware, but when paired 487 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 488 is similar to WriteCombine) is out of the scope of cache coherency 489 machanism for PCIe devices (this is a PCIe protocol violation, which 490 may be fixed in newer chipsets). 491 492 This means WUC can only used for write-only memory regions now, so 493 this option is disabled by default, making WUC silently fallback to 494 SUC for ioremap(). You can enable this option if the kernel is ensured 495 to run on hardware without this bug. 496 497 You can override this setting via writecombine=on/off boot parameter. 498 499config ARCH_STRICT_ALIGN 500 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 501 default y 502 help 503 Not all LoongArch cores support h/w unaligned access, we can use 504 -mstrict-align build parameter to prevent unaligned accesses. 505 506 CPUs with h/w unaligned access support: 507 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 508 509 CPUs without h/w unaligned access support: 510 Loongson-2K500/2K1000. 511 512 This option is enabled by default to make the kernel be able to run 513 on all LoongArch systems. But you can disable it manually if you want 514 to run kernel only on systems with h/w unaligned access support in 515 order to optimise for performance. 516 517config CPU_HAS_FPU 518 bool 519 default y 520 521config CPU_HAS_LSX 522 bool "Support for the Loongson SIMD Extension" 523 depends on AS_HAS_LSX_EXTENSION 524 help 525 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 526 and a set of SIMD instructions to operate on them. When this option 527 is enabled the kernel will support allocating & switching LSX 528 vector register contexts. If you know that your kernel will only be 529 running on CPUs which do not support LSX or that your userland will 530 not be making use of it then you may wish to say N here to reduce 531 the size & complexity of your kernel. 532 533 If unsure, say Y. 534 535config CPU_HAS_LASX 536 bool "Support for the Loongson Advanced SIMD Extension" 537 depends on CPU_HAS_LSX 538 depends on AS_HAS_LASX_EXTENSION 539 help 540 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 541 registers and a set of SIMD instructions to operate on them. When this 542 option is enabled the kernel will support allocating & switching LASX 543 vector register contexts. If you know that your kernel will only be 544 running on CPUs which do not support LASX or that your userland will 545 not be making use of it then you may wish to say N here to reduce 546 the size & complexity of your kernel. 547 548 If unsure, say Y. 549 550config CPU_HAS_LBT 551 bool "Support for the Loongson Binary Translation Extension" 552 depends on AS_HAS_LBT_EXTENSION 553 help 554 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 555 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 556 Enabling this option allows the kernel to allocate and switch registers 557 specific to LBT. 558 559 If you want to use this feature, such as the Loongson Architecture 560 Translator (LAT), say Y. 561 562config CPU_HAS_PREFETCH 563 bool 564 default y 565 566config ARCH_SUPPORTS_KEXEC 567 def_bool y 568 569config ARCH_SUPPORTS_CRASH_DUMP 570 def_bool y 571 572config ARCH_SELECTS_CRASH_DUMP 573 def_bool y 574 depends on CRASH_DUMP 575 select RELOCATABLE 576 577config RELOCATABLE 578 bool "Relocatable kernel" 579 help 580 This builds the kernel as a Position Independent Executable (PIE), 581 which retains all relocation metadata required, so as to relocate 582 the kernel binary at runtime to a different virtual address from 583 its link address. 584 585config RANDOMIZE_BASE 586 bool "Randomize the address of the kernel (KASLR)" 587 depends on RELOCATABLE 588 help 589 Randomizes the physical and virtual address at which the 590 kernel image is loaded, as a security feature that 591 deters exploit attempts relying on knowledge of the location 592 of kernel internals. 593 594 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 595 596 If unsure, say N. 597 598config RANDOMIZE_BASE_MAX_OFFSET 599 hex "Maximum KASLR offset" if EXPERT 600 depends on RANDOMIZE_BASE 601 range 0x0 0x10000000 602 default "0x01000000" 603 help 604 When KASLR is active, this provides the maximum offset that will 605 be applied to the kernel image. It should be set according to the 606 amount of physical RAM available in the target system. 607 608 This is limited by the size of the lower address memory, 256MB. 609 610config SECCOMP 611 bool "Enable seccomp to safely compute untrusted bytecode" 612 depends on PROC_FS 613 default y 614 help 615 This kernel feature is useful for number crunching applications 616 that may need to compute untrusted bytecode during their 617 execution. By using pipes or other transports made available to 618 the process as file descriptors supporting the read/write 619 syscalls, it's possible to isolate those applications in 620 their own address space using seccomp. Once seccomp is 621 enabled via /proc/<pid>/seccomp, it cannot be disabled 622 and the task is only allowed to execute a few safe syscalls 623 defined by each seccomp mode. 624 625 If unsure, say Y. Only embedded should say N here. 626 627endmenu 628 629config ARCH_SELECT_MEMORY_MODEL 630 def_bool y 631 632config ARCH_FLATMEM_ENABLE 633 def_bool y 634 depends on !NUMA 635 636config ARCH_SPARSEMEM_ENABLE 637 def_bool y 638 select SPARSEMEM_VMEMMAP_ENABLE 639 help 640 Say Y to support efficient handling of sparse physical memory, 641 for architectures which are either NUMA (Non-Uniform Memory Access) 642 or have huge holes in the physical address space for other reasons. 643 See <file:Documentation/mm/numa.rst> for more. 644 645config ARCH_ENABLE_THP_MIGRATION 646 def_bool y 647 depends on TRANSPARENT_HUGEPAGE 648 649config ARCH_MEMORY_PROBE 650 def_bool y 651 depends on MEMORY_HOTPLUG 652 653config MMU 654 bool 655 default y 656 657config ARCH_MMAP_RND_BITS_MIN 658 default 12 659 660config ARCH_MMAP_RND_BITS_MAX 661 default 18 662 663config ARCH_SUPPORTS_UPROBES 664 def_bool y 665 666config KASAN_SHADOW_OFFSET 667 hex 668 default 0x0 669 depends on KASAN 670 671menu "Power management options" 672 673config ARCH_SUSPEND_POSSIBLE 674 def_bool y 675 676config ARCH_HIBERNATION_POSSIBLE 677 def_bool y 678 679source "kernel/power/Kconfig" 680source "drivers/acpi/Kconfig" 681 682endmenu 683 684source "arch/loongarch/kvm/Kconfig" 685