Feature status on all architectures¶

Subsystem: core¶

Feature	Kconfig / Description	Status per architecture
cBPF-JIT	`HAVE_CBPF_JIT` arch supports cBPF JIT optimizations	ok: mips, powerpc sparc TODO: alpha, arc, arm arm64, csky, hexagon, ia64 loong, m68k, microblaze nios2, openrisc, parisc riscv, s390, sh, um, x86 xtensa
eBPF-JIT	`HAVE_EBPF_JIT` arch supports eBPF JIT optimizations	ok: arm, arm64, mips powerpc, riscv, s390, sparc x86 TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, sh, um, xtensa
generic-idle-thread	`GENERIC_SMP_IDLE_THREAD` arch makes use of the generic SMP idle thread facility	ok: alpha, arc, arm arm64, csky, hexagon, ia64 loong, mips, openrisc parisc, powerpc, riscv s390, sh, sparc, x86 xtensa TODO: m68k, microblaze nios2, um
jump-labels	`HAVE_ARCH_JUMP_LABEL` arch supports live patched, high efficiency branches	ok: arc, arm, arm64 mips, parisc, powerpc riscv, s390, sparc, x86 xtensa TODO: alpha, csky hexagon, ia64, loong, m68k microblaze, nios2, openrisc sh, um
thread-info-in-task	`THREAD_INFO_IN_TASK` arch makes use of the core kernel facility to embedd thread_info in task_struct	ok: arm, arm64, parisc powerpc, riscv, s390, x86 TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, mips, nios2 openrisc, sh, sparc, um xtensa
tracehook	`HAVE_ARCH_TRACEHOOK` arch supports tracehook (ptrace) register handling APIs	ok: arc, arm, arm64 csky, hexagon, ia64, loong mips, nios2, openrisc parisc, powerpc, riscv s390, sh, sparc, x86 xtensa TODO: alpha, m68k microblaze, um

Subsystem: debug¶

Feature	Kconfig / Description	Status per architecture
debug-vm-pgtable	`ARCH_HAS_DEBUG_VM_PGTABLE` arch supports pgtable tests for semantics compliance	ok: arc, arm64, parisc powerpc, riscv, s390, x86 xtensa TODO: alpha, arm, csky hexagon, ia64, loong, m68k microblaze, mips, nios2 openrisc, sh, sparc, um
gcov-profile-all	`ARCH_HAS_GCOV_PROFILE_ALL` arch supports whole-kernel GCOV code coverage profiling	ok: arm, arm64, csky microblaze, mips, powerpc riscv, s390, sh, um, x86 xtensa TODO: alpha, arc hexagon, ia64, loong, m68k nios2, openrisc, parisc sparc
KASAN	`HAVE_ARCH_KASAN` arch supports the KASAN runtime memory checker	ok: arm, arm64, powerpc riscv, s390, x86, xtensa TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, mips, nios2 openrisc, parisc, sh, sparc um
kcov	`ARCH_HAS_KCOV` arch supports kcov for coverage-guided fuzzing	ok: arm, arm64, mips powerpc, riscv, s390, um x86, xtensa TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, sh, sparc
kgdb	`HAVE_ARCH_KGDB` arch supports the kGDB kernel debugger	ok: arc, arm, arm64 hexagon, microblaze, mips nios2, parisc, powerpc riscv, sh, sparc, x86 TODO: alpha, csky, ia64 loong, m68k, openrisc, s390 um, xtensa
kmemleak	`HAVE_DEBUG_KMEMLEAK` arch supports the kernel memory leak detector	ok: arc, arm, arm64 csky, microblaze, mips powerpc, riscv, s390, sh sparc, um, x86, xtensa TODO: alpha, hexagon ia64, loong, m68k, nios2 openrisc, parisc
kprobes	`HAVE_KPROBES` arch supports live patched kernel probe	ok: arc, arm, arm64 csky, ia64, mips, parisc powerpc, riscv, s390, sh sparc, x86 TODO: alpha, hexagon loong, m68k, microblaze nios2, openrisc, um, xtensa
kprobes-on-ftrace	`HAVE_KPROBES_ON_FTRACE` arch supports combined kprobes and ftrace live patching	ok: csky, parisc powerpc, riscv, s390, x86 TODO: alpha, arc, arm arm64, hexagon, ia64, loong m68k, microblaze, mips nios2, openrisc, sh, sparc um, xtensa
kretprobes	`HAVE_KRETPROBES` arch supports kernel function-return probes	ok: arc, arm, arm64 csky, ia64, mips, parisc powerpc, riscv, s390, sh sparc, x86 TODO: alpha, hexagon loong, m68k, microblaze nios2, openrisc, um, xtensa
optprobes	`HAVE_OPTPROBES` arch supports live patched optprobes	ok: arm, powerpc, x86 TODO: alpha, arc, arm64 csky, hexagon, ia64, loong m68k, microblaze, mips nios2, openrisc, parisc riscv, s390, sh, sparc, um xtensa
stackprotector	`HAVE_STACKPROTECTOR` arch supports compiler driven stack overflow protection	ok: arm, arm64, csky mips, powerpc, riscv, sh x86, xtensa TODO: alpha, arc hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, s390, sparc, um
uprobes	`ARCH_SUPPORTS_UPROBES` arch supports live patched user probes	ok: arm, arm64, csky mips, powerpc, riscv, s390 sparc, x86 TODO: alpha, arc hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, sh, um, xtensa
user-ret-profiler	`HAVE_USER_RETURN_NOTIFIER` arch supports user-space return from system call profiler	ok: x86 TODO: alpha, arc, arm arm64, csky, hexagon, ia64 loong, m68k, microblaze mips, nios2, openrisc parisc, powerpc, riscv s390, sh, sparc, um, xtensa

Subsystem: io¶

Feature

Kconfig / Description

Status per architecture

dma-contiguous

HAVE_DMA_CONTIGUOUS

arch supports the DMA CMA (continuous memory allocator)

ok: arm, arm64, csky loong, microblaze, mips riscv, s390, x86, xtensa
TODO: alpha, arc hexagon, ia64, m68k, nios2 openrisc, parisc, powerpc sh, sparc, um

Subsystem: locking¶

Feature	Kconfig / Description	Status per architecture
cmpxchg-local	`HAVE_CMPXCHG_LOCAL` arch supports the this_cpu_cmpxchg() API	ok: arm64, s390, x86 TODO: alpha, arc, arm csky, hexagon, ia64, loong m68k, microblaze, mips nios2, openrisc, parisc powerpc, riscv, sh, sparc um, xtensa
lockdep	`LOCKDEP_SUPPORT` arch supports the runtime locking correctness debug facility	ok: arc, arm, arm64 csky, hexagon, loong microblaze, mips, openrisc powerpc, riscv, s390, sh sparc, um, x86, xtensa TODO: alpha, ia64, m68k nios2, parisc
queued-rwlocks	`ARCH_USE_QUEUED_RWLOCKS` arch supports queued rwlocks	ok: arm64, csky, loong mips, openrisc, powerpc riscv, sparc, x86, xtensa TODO: alpha, arc, arm hexagon, ia64, m68k microblaze, nios2, parisc s390, sh, um
queued-spinlocks	`ARCH_USE_QUEUED_SPINLOCKS` arch supports queued spinlocks	ok: arm64, mips openrisc, powerpc, sparc x86, xtensa TODO: alpha, arc, arm csky, hexagon, ia64, loong m68k, microblaze, nios2 parisc, riscv, s390, sh, um

Subsystem: perf¶

Feature

Kconfig / Description

Status per architecture

kprobes-event

HAVE_REGS_AND_STACK_ACCESS_API

arch supports kprobes with perf events

ok: arc, arm, arm64 csky, hexagon, loong, mips parisc, powerpc, riscv s390, sh, sparc, x86
TODO: alpha, ia64, m68k microblaze, nios2, openrisc um, xtensa

perf-regs

HAVE_PERF_REGS

arch supports perf events register access

ok: arm, arm64, csky mips, powerpc, riscv, s390 x86
TODO: alpha, arc hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, sh, sparc, um xtensa

perf-stackdump

HAVE_PERF_USER_STACK_DUMP

arch supports perf events stack dumps

ok: arm, arm64, csky mips, powerpc, riscv, s390 x86
TODO: alpha, arc hexagon, ia64, loong, m68k microblaze, nios2, openrisc parisc, sh, sparc, um xtensa

Subsystem: sched¶

Feature

Kconfig / Description

Status per architecture

membarrier-sync-core

ARCH_HAS_MEMBARRIER_SYNC_CORE

arch supports core serializing membarrier

ok: arm, arm64, powerpc x86
TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, mips, nios2 openrisc, parisc, riscv s390, sh, sparc, um, xtensa

numa-balancing

ARCH_SUPPORTS_NUMA_BALANCING

arch supports NUMA balancing

ok: arm64, loong powerpc, riscv, s390, x86
TODO: alpha, ia64, mips sparc
Not compatible: arc arm, csky, hexagon, m68k microblaze, nios2, openrisc parisc, sh, um, xtensa

Subsystem: seccomp¶

Feature

Kconfig / Description

Status per architecture

seccomp-filter

HAVE_ARCH_SECCOMP_FILTER

arch supports seccomp filters

ok: arm, arm64, csky loong, mips, parisc powerpc, riscv, s390, sh um, x86, xtensa
TODO: alpha, arc hexagon, ia64, m68k microblaze, nios2, openrisc sparc

Subsystem: time¶

Feature	Kconfig / Description	Status per architecture
arch-tick-broadcast	`ARCH_HAS_TICK_BROADCAST` arch provides tick_broadcast()	ok: arm, arm64, loong mips, powerpc, riscv, sh TODO: alpha, arc, csky hexagon, ia64, m68k microblaze, nios2, openrisc parisc, s390, sparc, um x86, xtensa
clockevents	`!LEGACY_TIMER_TICK` arch support generic clock events	ok: alpha, arc, arm64 csky, hexagon, loong microblaze, mips, nios2 openrisc, powerpc, riscv s390, sh, sparc, um, x86 xtensa TODO: arm, ia64, m68k parisc
irq-time-acct	`HAVE_IRQ_TIME_ACCOUNTING` arch supports precise IRQ time accounting	ok: arm, arm64, loong mips, powerpc, riscv, x86 xtensa TODO: arc, csky hexagon, m68k, microblaze nios2, openrisc, sh, um Not compatible: alpha ia64, parisc, s390, sparc
user-context-tracking	`HAVE_CONTEXT_TRACKING_USER` arch supports user context tracking for NO_HZ_FULL	ok: arm, arm64, csky loong, mips, powerpc, riscv sparc, x86, xtensa TODO: alpha, arc hexagon, ia64, m68k microblaze, nios2, openrisc parisc, s390, sh, um
virt-cpuacct	`HAVE_VIRT_CPU_ACCOUNTING` arch supports precise virtual CPU time accounting	ok: alpha, arm, arm64 csky, ia64, loong, mips parisc, powerpc, s390 sparc, x86, xtensa TODO: arc, hexagon m68k, microblaze, nios2 openrisc, riscv, sh, um

Subsystem: vm¶

Feature	Kconfig / Description	Status per architecture
batch-unmap-tlb-flush	`ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH` arch supports deferral of TLB flush until multiple pages are unmapped	ok: x86 TODO: alpha, arc, arm csky, hexagon, ia64, loong mips, parisc, powerpc riscv, s390, sh, sparc xtensa N/A: arm64 Not compatible: m68k microblaze, nios2, openrisc um
ELF-ASLR	`ARCH_HAS_ELF_RANDOMIZE` arch randomizes the stack, heap and binary images of ELF binaries	ok: arm, arm64, mips parisc, powerpc, riscv s390, x86 TODO: alpha, arc, csky hexagon, ia64, loong, m68k microblaze, nios2, openrisc sh, sparc, um, xtensa
huge-vmap	`HAVE_ARCH_HUGE_VMAP` arch supports the arch_vmap_pud_supported() and arch_vmap_pmd_supported() VM APIs	ok: arm64, powerpc, x86 TODO: alpha, arc, arm csky, hexagon, ia64, loong m68k, microblaze, mips nios2, openrisc, parisc riscv, s390, sh, sparc, um xtensa
ioremap_prot	`HAVE_IOREMAP_PROT` arch has ioremap_prot()	ok: arc, arm64, loong mips, powerpc, s390, sh x86 TODO: alpha, arm, csky hexagon, ia64, m68k microblaze, nios2, openrisc parisc, riscv, sparc, um xtensa
PG_uncached	`ARCH_USES_PG_UNCACHED` arch supports the PG_uncached page flag	ok: ia64, x86 TODO: alpha, arc, arm arm64, csky, hexagon, loong m68k, microblaze, mips nios2, openrisc, parisc powerpc, riscv, s390, sh sparc, um, xtensa
pte_special	`ARCH_HAS_PTE_SPECIAL` arch supports the pte_special()/pte_mkspecial() VM APIs	ok: arc, arm, arm64 loong, mips, parisc powerpc, riscv, s390, sh sparc, x86 TODO: alpha, csky hexagon, ia64, m68k microblaze, nios2, openrisc um, xtensa
THP	`HAVE_ARCH_TRANSPARENT_HUGEPAGE` arch supports transparent hugepages	ok: arc, arm, arm64 loong, mips, powerpc, riscv s390, sparc, x86 TODO: alpha, ia64 parisc Not compatible: csky hexagon, m68k, microblaze nios2, openrisc, sh, um xtensa