__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
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 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
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<section id="feature-status-on-x86-architecture">
<h1><span class="section-number">34. </span>Feature status on x86 architecture<a class="headerlink" href="#feature-status-on-x86-architecture" title="Link to this heading">ΒΆ</a></h1>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Subsystem</p></th>
<th class="head"><p>Feature</p></th>
<th class="head"><p>Kconfig</p></th>
<th class="head"><p>Status</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>core</p></td>
<td><p>cBPF-JIT</p></td>
<td><p>HAVE_CBPF_JIT</p></td>
<td><p>TODO</p></td>
<td><p>arch supports cBPF JIT optimizations</p></td>
</tr>
<tr class="row-odd"><td><p>core</p></td>
<td><p>eBPF-JIT</p></td>
<td><p>HAVE_EBPF_JIT</p></td>
<td><p>ok</p></td>
<td><p>arch supports eBPF JIT optimizations</p></td>
</tr>
<tr class="row-even"><td><p>core</p></td>
<td><p>generic-idle-thread</p></td>
<td><p>GENERIC_SMP_IDLE_THREAD</p></td>
<td><p>ok</p></td>
<td><p>arch makes use of the generic SMP idle thread facility</p></td>
</tr>
<tr class="row-odd"><td><p>core</p></td>
<td><p>jump-labels</p></td>
<td><p>HAVE_ARCH_JUMP_LABEL</p></td>
<td><p>ok</p></td>
<td><p>arch supports live patched, high efficiency branches</p></td>
</tr>
<tr class="row-even"><td><p>core</p></td>
<td><p>mseal-system-mappings</p></td>
<td><p>ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS</p></td>
<td><p>ok</p></td>
<td><p>arch supports mseal system mappings</p></td>
</tr>
<tr class="row-odd"><td><p>core</p></td>
<td><p>thread-info-in-task</p></td>
<td><p>THREAD_INFO_IN_TASK</p></td>
<td><p>ok</p></td>
<td><p>arch makes use of the core kernel facility to embed thread_info in task_struct</p></td>
</tr>
<tr class="row-even"><td><p>core</p></td>
<td><p>tracehook</p></td>
<td><p>HAVE_ARCH_TRACEHOOK</p></td>
<td><p>ok</p></td>
<td><p>arch supports tracehook (ptrace) register handling APIs</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>debug-vm-pgtable</p></td>
<td><p>ARCH_HAS_DEBUG_VM_PGTABLE</p></td>
<td><p>ok</p></td>
<td><p>arch supports pgtable tests for semantics compliance</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>gcov-profile-all</p></td>
<td><p>ARCH_HAS_GCOV_PROFILE_ALL</p></td>
<td><p>ok</p></td>
<td><p>arch supports whole-kernel GCOV code coverage profiling</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>KASAN</p></td>
<td><p>HAVE_ARCH_KASAN</p></td>
<td><p>ok</p></td>
<td><p>arch supports the KASAN runtime memory checker</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>kcov</p></td>
<td><p>ARCH_HAS_KCOV</p></td>
<td><p>ok</p></td>
<td><p>arch supports kcov for coverage-guided fuzzing</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>kgdb</p></td>
<td><p>HAVE_ARCH_KGDB</p></td>
<td><p>ok</p></td>
<td><p>arch supports the kGDB kernel debugger</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>kmemleak</p></td>
<td><p>HAVE_DEBUG_KMEMLEAK</p></td>
<td><p>ok</p></td>
<td><p>arch supports the kernel memory leak detector</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>kprobes</p></td>
<td><p>HAVE_KPROBES</p></td>
<td><p>ok</p></td>
<td><p>arch supports live patched kernel probe</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>kprobes-on-ftrace</p></td>
<td><p>HAVE_KPROBES_ON_FTRACE</p></td>
<td><p>ok</p></td>
<td><p>arch supports combined kprobes and ftrace live patching</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>kretprobes</p></td>
<td><p>HAVE_KRETPROBES</p></td>
<td><p>ok</p></td>
<td><p>arch supports kernel function-return probes</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>optprobes</p></td>
<td><p>HAVE_OPTPROBES</p></td>
<td><p>ok</p></td>
<td><p>arch supports live patched optprobes</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>stackprotector</p></td>
<td><p>HAVE_STACKPROTECTOR</p></td>
<td><p>ok</p></td>
<td><p>arch supports compiler driven stack overflow protection</p></td>
</tr>
<tr class="row-even"><td><p>debug</p></td>
<td><p>uprobes</p></td>
<td><p>ARCH_SUPPORTS_UPROBES</p></td>
<td><p>ok</p></td>
<td><p>arch supports live patched user probes</p></td>
</tr>
<tr class="row-odd"><td><p>debug</p></td>
<td><p>user-ret-profiler</p></td>
<td><p>HAVE_USER_RETURN_NOTIFIER</p></td>
<td><p>ok</p></td>
<td><p>arch supports user-space return from system call profiler</p></td>
</tr>
<tr class="row-even"><td><p>io</p></td>
<td><p>dma-contiguous</p></td>
<td><p>HAVE_DMA_CONTIGUOUS</p></td>
<td><p>ok</p></td>
<td><p>arch supports the DMA CMA (continuous memory allocator)</p></td>
</tr>
<tr class="row-odd"><td><p>locking</p></td>
<td><p>cmpxchg-local</p></td>
<td><p>HAVE_CMPXCHG_LOCAL</p></td>
<td><p>ok</p></td>
<td><p>arch supports the <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">this_cpu_cmpxchg()</span></code> API</p></td>
</tr>
<tr class="row-even"><td><p>locking</p></td>
<td><p>lockdep</p></td>
<td><p>LOCKDEP_SUPPORT</p></td>
<td><p>ok</p></td>
<td><p>arch supports the runtime locking correctness debug facility</p></td>
</tr>
<tr class="row-odd"><td><p>locking</p></td>
<td><p>queued-rwlocks</p></td>
<td><p>ARCH_USE_QUEUED_RWLOCKS</p></td>
<td><p>ok</p></td>
<td><p>arch supports queued rwlocks</p></td>
</tr>
<tr class="row-even"><td><p>locking</p></td>
<td><p>queued-spinlocks</p></td>
<td><p>ARCH_USE_QUEUED_SPINLOCKS</p></td>
<td><p>ok</p></td>
<td><p>arch supports queued spinlocks</p></td>
</tr>
<tr class="row-odd"><td><p>perf</p></td>
<td><p>kprobes-event</p></td>
<td><p>HAVE_REGS_AND_STACK_ACCESS_API</p></td>
<td><p>ok</p></td>
<td><p>arch supports kprobes with perf events</p></td>
</tr>
<tr class="row-even"><td><p>perf</p></td>
<td><p>perf-regs</p></td>
<td><p>HAVE_PERF_REGS</p></td>
<td><p>ok</p></td>
<td><p>arch supports perf events register access</p></td>
</tr>
<tr class="row-odd"><td><p>perf</p></td>
<td><p>perf-stackdump</p></td>
<td><p>HAVE_PERF_USER_STACK_DUMP</p></td>
<td><p>ok</p></td>
<td><p>arch supports perf events stack dumps</p></td>
</tr>
<tr class="row-even"><td><p>sched</p></td>
<td><p>membarrier-sync-core</p></td>
<td><p>ARCH_HAS_MEMBARRIER_SYNC_CORE</p></td>
<td><p>ok</p></td>
<td><p>arch supports core serializing membarrier</p></td>
</tr>
<tr class="row-odd"><td><p>sched</p></td>
<td><p>numa-balancing</p></td>
<td><p>ARCH_SUPPORTS_NUMA_BALANCING</p></td>
<td><p>ok</p></td>
<td><p>arch supports NUMA balancing</p></td>
</tr>
<tr class="row-even"><td><p>seccomp</p></td>
<td><p>seccomp-filter</p></td>
<td><p>HAVE_ARCH_SECCOMP_FILTER</p></td>
<td><p>ok</p></td>
<td><p>arch supports seccomp filters</p></td>
</tr>
<tr class="row-odd"><td><p>time</p></td>
<td><p>arch-tick-broadcast</p></td>
<td><p>ARCH_HAS_TICK_BROADCAST</p></td>
<td><p>TODO</p></td>
<td><p>arch provides <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">tick_broadcast()</span></code></p></td>
</tr>
<tr class="row-even"><td><p>time</p></td>
<td><p>clockevents</p></td>
<td><p>!LEGACY_TIMER_TICK</p></td>
<td><p>ok</p></td>
<td><p>arch support generic clock events</p></td>
</tr>
<tr class="row-odd"><td><p>time</p></td>
<td><p>irq-time-acct</p></td>
<td><p>HAVE_IRQ_TIME_ACCOUNTING</p></td>
<td><p>ok</p></td>
<td><p>arch supports precise IRQ time accounting</p></td>
</tr>
<tr class="row-even"><td><p>time</p></td>
<td><p>user-context-tracking</p></td>
<td><p>HAVE_CONTEXT_TRACKING_USER</p></td>
<td><p>ok</p></td>
<td><p>arch supports user context tracking for NO_HZ_FULL</p></td>
</tr>
<tr class="row-odd"><td><p>time</p></td>
<td><p>virt-cpuacct</p></td>
<td><p>HAVE_VIRT_CPU_ACCOUNTING</p></td>
<td><p>ok</p></td>
<td><p>arch supports precise virtual CPU time accounting</p></td>
</tr>
<tr class="row-even"><td><p>vm</p></td>
<td><p>batch-unmap-tlb-flush</p></td>
<td><p>ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH</p></td>
<td><p>ok</p></td>
<td><p>arch supports deferral of TLB flush until multiple pages are unmapped</p></td>
</tr>
<tr class="row-odd"><td><p>vm</p></td>
<td><p>ELF-ASLR</p></td>
<td><p>ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT</p></td>
<td><p>ok</p></td>
<td><p>arch randomizes the stack, heap and binary images of ELF binaries</p></td>
</tr>
<tr class="row-even"><td><p>vm</p></td>
<td><p>huge-vmap</p></td>
<td><p>HAVE_ARCH_HUGE_VMAP</p></td>
<td><p>ok</p></td>
<td><p>arch supports the <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">arch_vmap_pud_supported()</span></code> and <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">arch_vmap_pmd_supported()</span></code> VM APIs</p></td>
</tr>
<tr class="row-odd"><td><p>vm</p></td>
<td><p>ioremap_prot</p></td>
<td><p>HAVE_IOREMAP_PROT</p></td>
<td><p>ok</p></td>
<td><p>arch has <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">ioremap_prot()</span></code></p></td>
</tr>
<tr class="row-even"><td><p>vm</p></td>
<td><p>pte_special</p></td>
<td><p>ARCH_HAS_PTE_SPECIAL</p></td>
<td><p>ok</p></td>
<td><p>arch supports the <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">pte_special()</span></code>/<code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">pte_mkspecial()</span></code> VM APIs</p></td>
</tr>
<tr class="row-odd"><td><p>vm</p></td>
<td><p>THP</p></td>
<td><p>HAVE_ARCH_TRANSPARENT_HUGEPAGE</p></td>
<td><p>ok</p></td>
<td><p>arch supports transparent hugepages</p></td>
</tr>
</tbody>
</table>
</section>


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