# SPDX-License-Identifier: GPL-2.0## General architecture dependent options# ## Note: arch/$(SRCARCH)/Kconfig needs to be included first so that it can# override the default values in this file.#source "arch/$(SRCARCH)/Kconfig" config ARCH_CONFIGURES_CPU_MITIGATIONS	bool if !ARCH_CONFIGURES_CPU_MITIGATIONSconfig CPU_MITIGATIONS	def_bool yendif ## Selected by architectures that need custom DMA operations for e.g. legacy# IOMMUs not handled by dma-iommu.  Drivers must never select this symbol.#config ARCH_HAS_DMA_OPS	depends on HAS_DMA	select DMA_OPS_HELPERS	bool menu "General architecture-dependent options" config ARCH_HAS_SUBPAGE_FAULTS	bool	help	  Select if the architecture can check permissions at sub-page	  granularity (e.g. arm64 MTE). The probe_user_*() functions	  must be implemented. config HOTPLUG_SMT	bool config SMT_NUM_THREADS_DYNAMIC	bool config ARCH_SUPPORTS_SCHED_SMT	bool config ARCH_SUPPORTS_SCHED_CLUSTER	bool config ARCH_SUPPORTS_SCHED_MC	bool config SCHED_SMT	bool "SMT (Hyperthreading) scheduler support"	depends on ARCH_SUPPORTS_SCHED_SMT	default y	help	  Improves the CPU scheduler's decision making when dealing with	  MultiThreading at a cost of slightly increased overhead in some	  places. If unsure say N here. config SCHED_CLUSTER	bool "Cluster scheduler support"	depends on ARCH_SUPPORTS_SCHED_CLUSTER	default y	help	  Cluster scheduler support improves the CPU scheduler's decision	  making when dealing with machines that have clusters of CPUs.	  Cluster usually means a couple of CPUs which are placed closely	  by sharing mid-level caches, last-level cache tags or internal	  busses. config SCHED_MC	bool "Multi-Core Cache (MC) scheduler support"	depends on ARCH_SUPPORTS_SCHED_MC	default y	help	  Multi-core scheduler support improves the CPU scheduler's decision	  making when dealing with multi-core CPU chips at a cost of slightly	  increased overhead in some places. If unsure say N here. # Selected by HOTPLUG_CORE_SYNC_DEAD or HOTPLUG_CORE_SYNC_FULLconfig HOTPLUG_CORE_SYNC	bool # Basic CPU dead synchronization selected by architectureconfig HOTPLUG_CORE_SYNC_DEAD	bool	select HOTPLUG_CORE_SYNC # Full CPU synchronization with alive state selected by architectureconfig HOTPLUG_CORE_SYNC_FULL	bool	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU	select HOTPLUG_CORE_SYNC config HOTPLUG_SPLIT_STARTUP	bool	select HOTPLUG_CORE_SYNC_FULL config HOTPLUG_PARALLEL	bool	select HOTPLUG_SPLIT_STARTUP config GENERIC_IRQ_ENTRY	bool config GENERIC_SYSCALL	bool	depends on GENERIC_IRQ_ENTRY config GENERIC_ENTRY	bool	select GENERIC_IRQ_ENTRY	select GENERIC_SYSCALL config ARCH_SUPPORTS_SYSCALL_USER_DISPATCH	bool config SYSCALL_USER_DISPATCH	bool "Syscall User Dispatch"	depends on ARCH_SUPPORTS_SYSCALL_USER_DISPATCH	depends on GENERIC_ENTRY	default y	help	  Syscall User Dispatch lets a thread have its own system calls	  intercepted and redirected to a userspace signal handler based	  on a prctl() configured instruction pointer range.	  If unsure, say Y. config KPROBES	bool "Kprobes"	depends on HAVE_KPROBES	select KALLSYMS	select EXECMEM	select NEED_TASKS_RCU	help	  Kprobes allows you to trap at almost any kernel address and	  execute a callback function.  register_kprobe() establishes	  a probepoint and specifies the callback.  Kprobes is useful	  for kernel debugging, non-intrusive instrumentation and testing.	  If in doubt, say "N". config JUMP_LABEL	bool "Optimize very unlikely/likely branches"	depends on HAVE_ARCH_JUMP_LABEL	select OBJTOOL if HAVE_JUMP_LABEL_HACK	help	  This option enables a transparent branch optimization that	  makes certain almost-always-true or almost-always-false branch	  conditions even cheaper to execute within the kernel. 	  Certain performance-sensitive kernel code, such as trace points,	  scheduler functionality, networking code and KVM have such	  branches and include support for this optimization technique. 	  If it is detected that the compiler has support for "asm goto",	  the kernel will compile such branches with just a nop	  instruction. When the condition flag is toggled to true, the	  nop will be converted to a jump instruction to execute the	  conditional block of instructions. 	  This technique lowers overhead and stress on the branch prediction	  of the processor and generally makes the kernel faster. The update	  of the condition is slower, but those are always very rare. 	  ( On 32-bit x86, the necessary options added to the compiler	    flags may increase the size of the kernel slightly. ) config STATIC_KEYS_SELFTEST	bool "Static key selftest"	depends on JUMP_LABEL	help	  Boot time self-test of the branch patching code. config STATIC_CALL_SELFTEST	bool "Static call selftest"	depends on HAVE_STATIC_CALL	help	  Boot time self-test of the call patching code. config OPTPROBES	def_bool y	depends on KPROBES && HAVE_OPTPROBES	select NEED_TASKS_RCU config KPROBES_ON_FTRACE	def_bool y	depends on KPROBES && HAVE_KPROBES_ON_FTRACE	depends on DYNAMIC_FTRACE_WITH_REGS	help	  If function tracer is enabled and the arch supports full	  passing of pt_regs to function tracing, then kprobes can	  optimize on top of function tracing. config UPROBES	def_bool n	depends on ARCH_SUPPORTS_UPROBES	select TASKS_TRACE_RCU	help	  Uprobes is the user-space counterpart to kprobes: they	  enable instrumentation applications (such as 'perf probe')	  to establish unintrusive probes in user-space binaries and	  libraries, by executing handler functions when the probes	  are hit by user-space applications. 	  ( These probes come in the form of single-byte breakpoints,	    managed by the kernel and kept transparent to the probed	    application. ) config HAVE_64BIT_ALIGNED_ACCESS	def_bool 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS	help	  Some architectures require 64 bit accesses to be 64 bit	  aligned, which also requires structs containing 64 bit values	  to be 64 bit aligned too. This includes some 32 bit	  architectures which can do 64 bit accesses, as well as 64 bit	  architectures without unaligned access. 	  This symbol should be selected by an architecture if 64 bit	  accesses are required to be 64 bit aligned in this way even	  though it is not a 64 bit architecture. 	  See Documentation/core-api/unaligned-memory-access.rst for	  more information on the topic of unaligned memory accesses. config HAVE_EFFICIENT_UNALIGNED_ACCESS	bool	help	  Some architectures are unable to perform unaligned accesses	  without the use of get_unaligned/put_unaligned. Others are	  unable to perform such accesses efficiently (e.g. trap on	  unaligned access and require fixing it up in the exception	  handler.) 	  This symbol should be selected by an architecture if it can	  perform unaligned accesses efficiently to allow different	  code paths to be selected for these cases. Some network	  drivers, for example, could opt to not fix up alignment	  problems with received packets if doing so would not help	  much. 	  See Documentation/core-api/unaligned-memory-access.rst for more	  information on the topic of unaligned memory accesses. config ARCH_USE_BUILTIN_BSWAP	bool	help	  GCC and Clang have builtin functions for handling byte-swapping.	  Using these allows the compiler to see what's happening and	  offers more opportunity for optimisation. In particular, the	  compiler will be able to combine the byteswap with a nearby load	  or store and use load-and-swap or store-and-swap instructions if	  the architecture has them. It should almost *never* result in code	  which is worse than the hand-coded assembler in <asm/swab.h>.	  But just in case it does, the use of the builtins is optional. 	  Any architecture with load-and-swap or store-and-swap	  instructions should set this. And it shouldn't hurt to set it	  on architectures that don't have such instructions. config KRETPROBES	def_bool y	depends on KPROBES && (HAVE_KRETPROBES || HAVE_RETHOOK) config KRETPROBE_ON_RETHOOK	def_bool y	depends on HAVE_RETHOOK	depends on KRETPROBES	select RETHOOK config USER_RETURN_NOTIFIER	bool	depends on HAVE_USER_RETURN_NOTIFIER	help	  Provide a kernel-internal notification when a cpu is about to	  switch to user mode. config HAVE_IOREMAP_PROT	bool config HAVE_KPROBES	bool config HAVE_KRETPROBES	bool config HAVE_OPTPROBES	bool config HAVE_KPROBES_ON_FTRACE	bool config ARCH_CORRECT_STACKTRACE_ON_KRETPROBE	bool	help	  Since kretprobes modifies return address on the stack, the	  stacktrace may see the kretprobe trampoline address instead	  of correct one. If the architecture stacktrace code and	  unwinder can adjust such entries, select this configuration. config HAVE_FUNCTION_ERROR_INJECTION	bool config HAVE_NMI	bool config HAVE_FUNCTION_DESCRIPTORS	bool config TRACE_IRQFLAGS_SUPPORT	bool config TRACE_IRQFLAGS_NMI_SUPPORT	bool ## An arch should select this if it provides all these things:##	task_pt_regs()		in asm/processor.h or asm/ptrace.h#	arch_has_single_step()	if there is hardware single-step support#	arch_has_block_step()	if there is hardware block-step support#	asm/syscall.h		supplying asm-generic/syscall.h interface#	linux/regset.h		user_regset interfaces#	CORE_DUMP_USE_REGSET	#define'd in linux/elf.h#	TIF_SYSCALL_TRACE	calls ptrace_report_syscall_{entry,exit}#	TIF_NOTIFY_RESUME	calls resume_user_mode_work()#config HAVE_ARCH_TRACEHOOK	bool config HAVE_DMA_CONTIGUOUS	bool config GENERIC_SMP_IDLE_THREAD	bool config GENERIC_IDLE_POLL_SETUP	bool config ARCH_HAS_FORTIFY_SOURCE	bool	help	  An architecture should select this when it can successfully	  build and run with CONFIG_FORTIFY_SOURCE. ## Select if the arch provides a historic keepinit alias for the retain_initrd# command line option#config ARCH_HAS_KEEPINITRD	bool # Select if arch has all set_memory_ro/rw/x/nx() functions in asm/cacheflush.hconfig ARCH_HAS_SET_MEMORY	bool # Select if arch has all set_direct_map_invalid/default() functionsconfig ARCH_HAS_SET_DIRECT_MAP	bool ## Select if the architecture provides the arch_dma_set_uncached symbol to# either provide an uncached segment alias for a DMA allocation, or# to remap the page tables in place.#config ARCH_HAS_DMA_SET_UNCACHED	bool ## Select if the architectures provides the arch_dma_clear_uncached symbol# to undo an in-place page table remap for uncached access.#config ARCH_HAS_DMA_CLEAR_UNCACHED	bool config ARCH_HAS_CPU_FINALIZE_INIT	bool config ARCH_HAS_DELAY_TIMER	bool # The architecture has a per-task state that includes the mm's PASIDconfig ARCH_HAS_CPU_PASID	bool	select IOMMU_MM_DATA config HAVE_ARCH_THREAD_STRUCT_WHITELIST	bool	help	  An architecture should select this to provide hardened usercopy	  knowledge about what region of the thread_struct should be	  whitelisted for copying to userspace. Normally this is only the	  FPU registers. Specifically, arch_thread_struct_whitelist()	  should be implemented. Without this, the entire thread_struct	  field in task_struct will be left whitelisted. # Select if arch wants to size task_struct dynamically via arch_task_struct_size:config ARCH_WANTS_DYNAMIC_TASK_STRUCT	bool config ARCH_WANTS_NO_INSTR	bool	help	  An architecture should select this if the noinstr macro is being used on	  functions to denote that the toolchain should avoid instrumenting such	  functions and is required for correctness. config ARCH_32BIT_OFF_T	bool	depends on !64BIT	help	  All new 32-bit architectures should have 64-bit off_t type on	  userspace side which corresponds to the loff_t kernel type. This	  is the requirement for modern ABIs. Some existing architectures	  still support 32-bit off_t. This option is enabled for all such	  architectures explicitly. # Selected by 64 bit architectures which have a 32 bit f_tinode in struct ustatconfig ARCH_32BIT_USTAT_F_TINODE	bool # Selected by architectures with Total Store Order (TSO)config ARCH_MEMORY_ORDER_TSO	bool config HAVE_ASM_MODVERSIONS	bool	help	  This symbol should be selected by an architecture if it provides	  <asm/asm-prototypes.h> to support the module versioning for symbols	  exported from assembly code. config HAVE_REGS_AND_STACK_ACCESS_API	bool	help	  This symbol should be selected by an architecture if it supports	  the API needed to access registers and stack entries from pt_regs,	  declared in asm/ptrace.h	  For example the kprobes-based event tracer needs this API. config HAVE_RSEQ	bool	depends on HAVE_REGS_AND_STACK_ACCESS_API	help	  This symbol should be selected by an architecture if it	  supports an implementation of restartable sequences. config HAVE_RUST	bool	help	  This symbol should be selected by an architecture if it	  supports Rust. config HAVE_FUNCTION_ARG_ACCESS_API	bool	help	  This symbol should be selected by an architecture if it supports	  the API needed to access function arguments from pt_regs,	  declared in asm/ptrace.h config HAVE_HW_BREAKPOINT	bool	depends on PERF_EVENTS config HAVE_MIXED_BREAKPOINTS_REGS	bool	depends on HAVE_HW_BREAKPOINT	help	  Depending on the arch implementation of hardware breakpoints,	  some of them have separate registers for data and instruction	  breakpoints addresses, others have mixed registers to store	  them but define the access type in a control register.	  Select this option if your arch implements breakpoints under the	  latter fashion. config HAVE_USER_RETURN_NOTIFIER	bool config HAVE_PERF_EVENTS_NMI	bool	help	  System hardware can generate an NMI using the perf event	  subsystem.  Also has support for calculating CPU cycle events	  to determine how many clock cycles in a given period. config HAVE_HARDLOCKUP_DETECTOR_PERF	bool	depends on HAVE_PERF_EVENTS_NMI	help	  The arch chooses to use the generic perf-NMI-based hardlockup	  detector. Must define HAVE_PERF_EVENTS_NMI. config HAVE_HARDLOCKUP_DETECTOR_ARCH	bool	help	  The arch provides its own hardlockup detector implementation instead	  of the generic ones. 	  It uses the same command line parameters, and sysctl interface,

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