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_PREEMPT_DYNAMIC_KEY 140 select HAVE_REGS_AND_STACK_ACCESS_API 141 select HAVE_RETHOOK 142 select HAVE_RSEQ 143 select HAVE_RUST 144 select HAVE_SAMPLE_FTRACE_DIRECT 145 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 146 select HAVE_SETUP_PER_CPU_AREA if NUMA 147 select HAVE_STACKPROTECTOR 148 select HAVE_SYSCALL_TRACEPOINTS 149 select HAVE_TIF_NOHZ 150 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 151 select IRQ_FORCED_THREADING 152 select IRQ_LOONGARCH_CPU 153 select LOCK_MM_AND_FIND_VMA 154 select MMU_GATHER_MERGE_VMAS if MMU 155 select MODULES_USE_ELF_RELA if MODULES 156 select NEED_PER_CPU_EMBED_FIRST_CHUNK 157 select NEED_PER_CPU_PAGE_FIRST_CHUNK 158 select OF 159 select OF_EARLY_FLATTREE 160 select PCI 161 select PCI_DOMAINS_GENERIC 162 select PCI_ECAM if ACPI 163 select PCI_LOONGSON 164 select PCI_MSI_ARCH_FALLBACKS 165 select PCI_QUIRKS 166 select PERF_USE_VMALLOC 167 select RTC_LIB 168 select SMP 169 select SPARSE_IRQ 170 select SYSCTL_ARCH_UNALIGN_ALLOW 171 select SYSCTL_ARCH_UNALIGN_NO_WARN 172 select SYSCTL_EXCEPTION_TRACE 173 select SWIOTLB 174 select TRACE_IRQFLAGS_SUPPORT 175 select USE_PERCPU_NUMA_NODE_ID 176 select USER_STACKTRACE_SUPPORT 177 select ZONE_DMA32 178 179config 32BIT 180 bool 181 182config 64BIT 183 def_bool y 184 185config GENERIC_BUG 186 def_bool y 187 depends on BUG 188 189config GENERIC_BUG_RELATIVE_POINTERS 190 def_bool y 191 depends on GENERIC_BUG 192 193config GENERIC_CALIBRATE_DELAY 194 def_bool y 195 196config GENERIC_CSUM 197 def_bool y 198 199config GENERIC_HWEIGHT 200 def_bool y 201 202config L1_CACHE_SHIFT 203 int 204 default "6" 205 206config LOCKDEP_SUPPORT 207 bool 208 default y 209 210config STACKTRACE_SUPPORT 211 bool 212 default y 213 214# MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the 215# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 216# are shared between architectures, and specifically expecting the symbols. 217config MACH_LOONGSON32 218 def_bool 32BIT 219 220config MACH_LOONGSON64 221 def_bool 64BIT 222 223config FIX_EARLYCON_MEM 224 def_bool y 225 226config PAGE_SIZE_4KB 227 bool 228 229config PAGE_SIZE_16KB 230 bool 231 232config PAGE_SIZE_64KB 233 bool 234 235config PGTABLE_2LEVEL 236 bool 237 238config PGTABLE_3LEVEL 239 bool 240 241config PGTABLE_4LEVEL 242 bool 243 244config PGTABLE_LEVELS 245 int 246 default 2 if PGTABLE_2LEVEL 247 default 3 if PGTABLE_3LEVEL 248 default 4 if PGTABLE_4LEVEL 249 250config SCHED_OMIT_FRAME_POINTER 251 bool 252 default y 253 254config AS_HAS_EXPLICIT_RELOCS 255 def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) 256 257config AS_HAS_FCSR_CLASS 258 def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) 259 260config AS_HAS_LSX_EXTENSION 261 def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) 262 263config AS_HAS_LASX_EXTENSION 264 def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) 265 266config AS_HAS_LBT_EXTENSION 267 def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) 268 269config AS_HAS_LVZ_EXTENSION 270 def_bool $(as-instr,hvcl 0) 271 272menu "Kernel type and options" 273 274source "kernel/Kconfig.hz" 275 276choice 277 prompt "Page Table Layout" 278 default 16KB_2LEVEL if 32BIT 279 default 16KB_3LEVEL if 64BIT 280 help 281 Allows choosing the page table layout, which is a combination 282 of page size and page table levels. The size of virtual memory 283 address space are determined by the page table layout. 284 285config 4KB_3LEVEL 286 bool "4KB with 3 levels" 287 select PAGE_SIZE_4KB 288 select PGTABLE_3LEVEL 289 help 290 This option selects 4KB page size with 3 level page tables, which 291 support a maximum of 39 bits of application virtual memory. 292 293config 4KB_4LEVEL 294 bool "4KB with 4 levels" 295 select PAGE_SIZE_4KB 296 select PGTABLE_4LEVEL 297 help 298 This option selects 4KB page size with 4 level page tables, which 299 support a maximum of 48 bits of application virtual memory. 300 301config 16KB_2LEVEL 302 bool "16KB with 2 levels" 303 select PAGE_SIZE_16KB 304 select PGTABLE_2LEVEL 305 help 306 This option selects 16KB page size with 2 level page tables, which 307 support a maximum of 36 bits of application virtual memory. 308 309config 16KB_3LEVEL 310 bool "16KB with 3 levels" 311 select PAGE_SIZE_16KB 312 select PGTABLE_3LEVEL 313 help 314 This option selects 16KB page size with 3 level page tables, which 315 support a maximum of 47 bits of application virtual memory. 316 317config 64KB_2LEVEL 318 bool "64KB with 2 levels" 319 select PAGE_SIZE_64KB 320 select PGTABLE_2LEVEL 321 help 322 This option selects 64KB page size with 2 level page tables, which 323 support a maximum of 42 bits of application virtual memory. 324 325config 64KB_3LEVEL 326 bool "64KB with 3 levels" 327 select PAGE_SIZE_64KB 328 select PGTABLE_3LEVEL 329 help 330 This option selects 64KB page size with 3 level page tables, which 331 support a maximum of 55 bits of application virtual memory. 332 333endchoice 334 335config CMDLINE 336 string "Built-in kernel command line" 337 help 338 For most platforms, the arguments for the kernel's command line 339 are provided at run-time, during boot. However, there are cases 340 where either no arguments are being provided or the provided 341 arguments are insufficient or even invalid. 342 343 When that occurs, it is possible to define a built-in command 344 line here and choose how the kernel should use it later on. 345 346choice 347 prompt "Kernel command line type" 348 default CMDLINE_BOOTLOADER 349 help 350 Choose how the kernel will handle the provided built-in command 351 line. 352 353config CMDLINE_BOOTLOADER 354 bool "Use bootloader kernel arguments if available" 355 help 356 Prefer the command-line passed by the boot loader if available. 357 Use the built-in command line as fallback in case we get nothing 358 during boot. This is the default behaviour. 359 360config CMDLINE_EXTEND 361 bool "Use built-in to extend bootloader kernel arguments" 362 help 363 The command-line arguments provided during boot will be 364 appended to the built-in command line. This is useful in 365 cases where the provided arguments are insufficient and 366 you don't want to or cannot modify them. 367 368config CMDLINE_FORCE 369 bool "Always use the built-in kernel command string" 370 help 371 Always use the built-in command line, even if we get one during 372 boot. This is useful in case you need to override the provided 373 command line on systems where you don't have or want control 374 over it. 375 376endchoice 377 378config DMI 379 bool "Enable DMI scanning" 380 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 381 default y 382 help 383 This enables SMBIOS/DMI feature for systems, and scanning of 384 DMI to identify machine quirks. 385 386config EFI 387 bool "EFI runtime service support" 388 select UCS2_STRING 389 select EFI_RUNTIME_WRAPPERS 390 help 391 This enables the kernel to use EFI runtime services that are 392 available (such as the EFI variable services). 393 394config EFI_STUB 395 bool "EFI boot stub support" 396 default y 397 depends on EFI 398 select EFI_GENERIC_STUB 399 help 400 This kernel feature allows the kernel to be loaded directly by 401 EFI firmware without the use of a bootloader. 402 403config SCHED_SMT 404 bool "SMT scheduler support" 405 default y 406 help 407 Improves scheduler's performance when there are multiple 408 threads in one physical core. 409 410config SMP 411 bool "Multi-Processing support" 412 help 413 This enables support for systems with more than one CPU. If you have 414 a system with only one CPU, say N. If you have a system with more 415 than one CPU, say Y. 416 417 If you say N here, the kernel will run on uni- and multiprocessor 418 machines, but will use only one CPU of a multiprocessor machine. If 419 you say Y here, the kernel will run on many, but not all, 420 uniprocessor machines. On a uniprocessor machine, the kernel 421 will run faster if you say N here. 422 423 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 424 425 If you don't know what to do here, say N. 426 427config HOTPLUG_CPU 428 bool "Support for hot-pluggable CPUs" 429 depends on SMP 430 select GENERIC_IRQ_MIGRATION 431 help 432 Say Y here to allow turning CPUs off and on. CPUs can be 433 controlled through /sys/devices/system/cpu. 434 (Note: power management support will enable this option 435 automatically on SMP systems. ) 436 Say N if you want to disable CPU hotplug. 437 438config NR_CPUS 439 int "Maximum number of CPUs (2-256)" 440 range 2 256 441 depends on SMP 442 default "64" 443 help 444 This allows you to specify the maximum number of CPUs which this 445 kernel will support. 446 447config NUMA 448 bool "NUMA Support" 449 select SMP 450 select ACPI_NUMA if ACPI 451 help 452 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 453 support. This option improves performance on systems with more 454 than one NUMA node; on single node systems it is generally better 455 to leave it disabled. 456 457config NODES_SHIFT 458 int 459 default "6" 460 depends on NUMA 461 462config ARCH_FORCE_MAX_ORDER 463 int "Maximum zone order" 464 default "13" if PAGE_SIZE_64KB 465 default "11" if PAGE_SIZE_16KB 466 default "10" 467 help 468 The kernel memory allocator divides physically contiguous memory 469 blocks into "zones", where each zone is a power of two number of 470 pages. This option selects the largest power of two that the kernel 471 keeps in the memory allocator. If you need to allocate very large 472 blocks of physically contiguous memory, then you may need to 473 increase this value. 474 475 The page size is not necessarily 4KB. Keep this in mind 476 when choosing a value for this option. 477 478config ARCH_IOREMAP 479 bool "Enable LoongArch DMW-based ioremap()" 480 help 481 We use generic TLB-based ioremap() by default since it has page 482 protection support. However, you can enable LoongArch DMW-based 483 ioremap() for better performance. 484 485config ARCH_WRITECOMBINE 486 bool "Enable WriteCombine (WUC) for ioremap()" 487 help 488 LoongArch maintains cache coherency in hardware, but when paired 489 with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which 490 is similar to WriteCombine) is out of the scope of cache coherency 491 machanism for PCIe devices (this is a PCIe protocol violation, which 492 may be fixed in newer chipsets). 493 494 This means WUC can only used for write-only memory regions now, so 495 this option is disabled by default, making WUC silently fallback to 496 SUC for ioremap(). You can enable this option if the kernel is ensured 497 to run on hardware without this bug. 498 499 You can override this setting via writecombine=on/off boot parameter. 500 501config ARCH_STRICT_ALIGN 502 bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT 503 default y 504 help 505 Not all LoongArch cores support h/w unaligned access, we can use 506 -mstrict-align build parameter to prevent unaligned accesses. 507 508 CPUs with h/w unaligned access support: 509 Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. 510 511 CPUs without h/w unaligned access support: 512 Loongson-2K500/2K1000. 513 514 This option is enabled by default to make the kernel be able to run 515 on all LoongArch systems. But you can disable it manually if you want 516 to run kernel only on systems with h/w unaligned access support in 517 order to optimise for performance. 518 519config CPU_HAS_FPU 520 bool 521 default y 522 523config CPU_HAS_LSX 524 bool "Support for the Loongson SIMD Extension" 525 depends on AS_HAS_LSX_EXTENSION 526 help 527 Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers 528 and a set of SIMD instructions to operate on them. When this option 529 is enabled the kernel will support allocating & switching LSX 530 vector register contexts. If you know that your kernel will only be 531 running on CPUs which do not support LSX or that your userland will 532 not be making use of it then you may wish to say N here to reduce 533 the size & complexity of your kernel. 534 535 If unsure, say Y. 536 537config CPU_HAS_LASX 538 bool "Support for the Loongson Advanced SIMD Extension" 539 depends on CPU_HAS_LSX 540 depends on AS_HAS_LASX_EXTENSION 541 help 542 Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector 543 registers and a set of SIMD instructions to operate on them. When this 544 option is enabled the kernel will support allocating & switching LASX 545 vector register contexts. If you know that your kernel will only be 546 running on CPUs which do not support LASX or that your userland will 547 not be making use of it then you may wish to say N here to reduce 548 the size & complexity of your kernel. 549 550 If unsure, say Y. 551 552config CPU_HAS_LBT 553 bool "Support for the Loongson Binary Translation Extension" 554 depends on AS_HAS_LBT_EXTENSION 555 help 556 Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 557 to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). 558 Enabling this option allows the kernel to allocate and switch registers 559 specific to LBT. 560 561 If you want to use this feature, such as the Loongson Architecture 562 Translator (LAT), say Y. 563 564config CPU_HAS_PREFETCH 565 bool 566 default y 567 568config ARCH_SUPPORTS_KEXEC 569 def_bool y 570 571config ARCH_SUPPORTS_CRASH_DUMP 572 def_bool y 573 574config ARCH_SELECTS_CRASH_DUMP 575 def_bool y 576 depends on CRASH_DUMP 577 select RELOCATABLE 578 579config RELOCATABLE 580 bool "Relocatable kernel" 581 help 582 This builds the kernel as a Position Independent Executable (PIE), 583 which retains all relocation metadata required, so as to relocate 584 the kernel binary at runtime to a different virtual address from 585 its link address. 586 587config RANDOMIZE_BASE 588 bool "Randomize the address of the kernel (KASLR)" 589 depends on RELOCATABLE 590 help 591 Randomizes the physical and virtual address at which the 592 kernel image is loaded, as a security feature that 593 deters exploit attempts relying on knowledge of the location 594 of kernel internals. 595 596 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. 597 598 If unsure, say N. 599 600config RANDOMIZE_BASE_MAX_OFFSET 601 hex "Maximum KASLR offset" if EXPERT 602 depends on RANDOMIZE_BASE 603 range 0x0 0x10000000 604 default "0x01000000" 605 help 606 When KASLR is active, this provides the maximum offset that will 607 be applied to the kernel image. It should be set according to the 608 amount of physical RAM available in the target system. 609 610 This is limited by the size of the lower address memory, 256MB. 611 612config SECCOMP 613 bool "Enable seccomp to safely compute untrusted bytecode" 614 depends on PROC_FS 615 default y 616 help 617 This kernel feature is useful for number crunching applications 618 that may need to compute untrusted bytecode during their 619 execution. By using pipes or other transports made available to 620 the process as file descriptors supporting the read/write 621 syscalls, it's possible to isolate those applications in 622 their own address space using seccomp. Once seccomp is 623 enabled via /proc/<pid>/seccomp, it cannot be disabled 624 and the task is only allowed to execute a few safe syscalls 625 defined by each seccomp mode. 626 627 If unsure, say Y. Only embedded should say N here. 628 629endmenu 630 631config ARCH_SELECT_MEMORY_MODEL 632 def_bool y 633 634config ARCH_FLATMEM_ENABLE 635 def_bool y 636 depends on !NUMA 637 638config ARCH_SPARSEMEM_ENABLE 639 def_bool y 640 select SPARSEMEM_VMEMMAP_ENABLE 641 help 642 Say Y to support efficient handling of sparse physical memory, 643 for architectures which are either NUMA (Non-Uniform Memory Access) 644 or have huge holes in the physical address space for other reasons. 645 See <file:Documentation/mm/numa.rst> for more. 646 647config ARCH_ENABLE_THP_MIGRATION 648 def_bool y 649 depends on TRANSPARENT_HUGEPAGE 650 651config ARCH_MEMORY_PROBE 652 def_bool y 653 depends on MEMORY_HOTPLUG 654 655config MMU 656 bool 657 default y 658 659config ARCH_MMAP_RND_BITS_MIN 660 default 12 661 662config ARCH_MMAP_RND_BITS_MAX 663 default 18 664 665config ARCH_SUPPORTS_UPROBES 666 def_bool y 667 668config KASAN_SHADOW_OFFSET 669 hex 670 default 0x0 671 depends on KASAN 672 673menu "Power management options" 674 675config ARCH_SUSPEND_POSSIBLE 676 def_bool y 677 678config ARCH_HIBERNATION_POSSIBLE 679 def_bool y 680 681source "kernel/power/Kconfig" 682source "drivers/acpi/Kconfig" 683 684endmenu 685 686source "arch/loongarch/kvm/Kconfig" 687