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