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-#
-# General architecture dependent options
-#
-
-config OPROFILE
- tristate "OProfile system profiling"
- depends on PROFILING
- depends on HAVE_OPROFILE
- select RING_BUFFER
- select RING_BUFFER_ALLOW_SWAP
- help
- OProfile is a profiling system capable of profiling the
- whole system, include the kernel, kernel modules, libraries,
- and applications.
-
- If unsure, say N.
-
-config OPROFILE_EVENT_MULTIPLEX
- bool "OProfile multiplexing support (EXPERIMENTAL)"
- default n
- depends on OPROFILE && X86
- help
- The number of hardware counters is limited. The multiplexing
- feature enables OProfile to gather more events than counters
- are provided by the hardware. This is realized by switching
- between events at an user specified time interval.
-
- If unsure, say N.
-
-config HAVE_OPROFILE
- bool
-
-config OPROFILE_NMI_TIMER
- def_bool y
- depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI
-
-config KPROBES
- bool "Kprobes"
- depends on MODULES
- depends on HAVE_KPROBES
- select KALLSYMS
- 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
- 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 OPTPROBES
- def_bool y
- depends on KPROBES && HAVE_OPTPROBES
- depends on !PREEMPT
-
-config UPROBES
- bool "Transparent user-space probes (EXPERIMENTAL)"
- depends on UPROBE_EVENT && PERF_EVENTS
- default n
- 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. )
-
- If in doubt, say "N".
-
-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/unaligned-memory-access.txt for more
- information on the topic of unaligned memory accesses.
-
-config HAVE_SYSCALL_WRAPPERS
- bool
-
-config KRETPROBES
- def_bool y
- depends on KPROBES && HAVE_KRETPROBES
-
-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_NMI_WATCHDOG
- 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 tracehook_report_syscall_{entry,exit}
-# TIF_NOTIFY_RESUME calls tracehook_notify_resume()
-# signal delivery calls tracehook_signal_handler()
-#
-config HAVE_ARCH_TRACEHOOK
- bool
-
-config HAVE_DMA_ATTRS
- bool
-
-config HAVE_DMA_CONTIGUOUS
- bool
-
-config USE_GENERIC_SMP_HELPERS
- bool
-
-config GENERIC_SMP_IDLE_THREAD
- bool
-
-# Select if arch init_task initializer is different to init/init_task.c
-config ARCH_INIT_TASK
- bool
-
-# Select if arch has its private alloc_task_struct() function
-config ARCH_TASK_STRUCT_ALLOCATOR
- bool
-
-# Select if arch has its private alloc_thread_info() function
-config ARCH_THREAD_INFO_ALLOCATOR
- bool
-
-config HAVE_REGS_AND_STACK_ACCESS_API
- bool
- help
- This symbol should be selected by an architecure 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_CLK
- bool
- help
- The <linux/clk.h> calls support software clock gating and
- thus are a key power management tool on many systems.
-
-config HAVE_DMA_API_DEBUG
- bool
-
-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_ARCH_JUMP_LABEL
- bool
-
-config HAVE_ARCH_MUTEX_CPU_RELAX
- bool
-
-config HAVE_RCU_TABLE_FREE
- bool
-
-config ARCH_HAVE_NMI_SAFE_CMPXCHG
- bool
-
-config HAVE_ALIGNED_STRUCT_PAGE
- bool
- help
- This makes sure that struct pages are double word aligned and that
- e.g. the SLUB allocator can perform double word atomic operations
- on a struct page for better performance. However selecting this
- might increase the size of a struct page by a word.
-
-config HAVE_CMPXCHG_LOCAL
- bool
-
-config HAVE_CMPXCHG_DOUBLE
- bool
-
-config ARCH_WANT_OLD_COMPAT_IPC
- bool
-
-config HAVE_ARCH_SECCOMP_FILTER
- bool
- help
- An arch should select this symbol if it provides all of these things:
- - syscall_get_arch()
- - syscall_get_arguments()
- - syscall_rollback()
- - syscall_set_return_value()
- - SIGSYS siginfo_t support
- - secure_computing is called from a ptrace_event()-safe context
- - secure_computing return value is checked and a return value of -1
- results in the system call being skipped immediately.
-
-config SECCOMP_FILTER
- def_bool y
- depends on HAVE_ARCH_SECCOMP_FILTER && SECCOMP && NET
- help
- Enable tasks to build secure computing environments defined
- in terms of Berkeley Packet Filter programs which implement
- task-defined system call filtering polices.
-
- See Documentation/prctl/seccomp_filter.txt for details.
-
-source "kernel/gcov/Kconfig"