[linux.git] / arch / Kconfig

#
# 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 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 trace point call sites"
       depends on HAVE_ARCH_JUMP_LABEL
       help
         If it is detected that the compiler has support for "asm goto",
	 the kernel will compile trace point locations with just a
	 nop instruction. When trace points are enabled, the nop will
	 be converted to a jump to the trace function. This technique
	 lowers overhead and stress on the branch prediction of the
	 processor.

	 On i386, 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 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
#
# 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 USE_GENERIC_SMP_HELPERS
	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_DEFAULT_NO_SPIN_MUTEXES
	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

source "kernel/gcov/Kconfig"
Commit	Line	Data
fb32e03f MD	1	#
	2	# General architecture dependent options
	3	#
125e5645 MD	4
125e5645 MD	5	config OPROFILE
b309a294	6	tristate "OProfile system profiling"
125e5645 MD	7	depends on PROFILING
125e5645 MD	8	depends on HAVE_OPROFILE
d69d59f4	9	select RING_BUFFER
9a5963eb	10	select RING_BUFFER_ALLOW_SWAP
125e5645 MD	11	help
	12	OProfile is a profiling system capable of profiling the
	13	whole system, include the kernel, kernel modules, libraries,
	14	and applications.
	15
	16	If unsure, say N.
	17
4d4036e0 JY	18	config OPROFILE_EVENT_MULTIPLEX
	19	bool "OProfile multiplexing support (EXPERIMENTAL)"
	20	default n
	21	depends on OPROFILE && X86
	22	help
	23	The number of hardware counters is limited. The multiplexing
	24	feature enables OProfile to gather more events than counters
	25	are provided by the hardware. This is realized by switching
	26	between events at an user specified time interval.
	27
	28	If unsure, say N.
	29
125e5645	30	config HAVE_OPROFILE
9ba16087	31	bool
125e5645 MD	32
	33	config KPROBES
	34	bool "Kprobes"
05ed160e	35	depends on MODULES
125e5645	36	depends on HAVE_KPROBES
05ed160e	37	select KALLSYMS
125e5645 MD	38	help
	39	Kprobes allows you to trap at almost any kernel address and
	40	execute a callback function. register_kprobe() establishes
	41	a probepoint and specifies the callback. Kprobes is useful
	42	for kernel debugging, non-intrusive instrumentation and testing.
	43	If in doubt, say "N".
	44
45f81b1c SR	45	config JUMP_LABEL
	46	bool "Optimize trace point call sites"
	47	depends on HAVE_ARCH_JUMP_LABEL
	48	help
	49	If it is detected that the compiler has support for "asm goto",
	50	the kernel will compile trace point locations with just a
	51	nop instruction. When trace points are enabled, the nop will
	52	be converted to a jump to the trace function. This technique
	53	lowers overhead and stress on the branch prediction of the
	54	processor.
	55
	56	On i386, options added to the compiler flags may increase
	57	the size of the kernel slightly.
	58
afd66255	59	config OPTPROBES
5cc718b9 MH	60	def_bool y
5cc718b9 MH	61	depends on KPROBES && HAVE_OPTPROBES
afd66255	62	depends on !PREEMPT
afd66255	63
58340a07	64	config HAVE_EFFICIENT_UNALIGNED_ACCESS
9ba16087	65	bool
58340a07 JB	66	help
	67	Some architectures are unable to perform unaligned accesses
	68	without the use of get_unaligned/put_unaligned. Others are
	69	unable to perform such accesses efficiently (e.g. trap on
	70	unaligned access and require fixing it up in the exception
	71	handler.)
	72
	73	This symbol should be selected by an architecture if it can
	74	perform unaligned accesses efficiently to allow different
	75	code paths to be selected for these cases. Some network
	76	drivers, for example, could opt to not fix up alignment
	77	problems with received packets if doing so would not help
	78	much.
	79
	80	See Documentation/unaligned-memory-access.txt for more
	81	information on the topic of unaligned memory accesses.
	82
1a94bc34 HC	83	config HAVE_SYSCALL_WRAPPERS
	84	bool
	85
9edddaa2 AM	86	config KRETPROBES
	87	def_bool y
	88	depends on KPROBES && HAVE_KRETPROBES
	89
7c68af6e AK	90	config USER_RETURN_NOTIFIER
	91	bool
	92	depends on HAVE_USER_RETURN_NOTIFIER
	93	help
	94	Provide a kernel-internal notification when a cpu is about to
	95	switch to user mode.
	96
28b2ee20	97	config HAVE_IOREMAP_PROT
9ba16087	98	bool
28b2ee20	99
125e5645	100	config HAVE_KPROBES
9ba16087	101	bool
9edddaa2 AM	102
9edddaa2 AM	103	config HAVE_KRETPROBES
9ba16087	104	bool
74bc7cee	105
afd66255 MH	106	config HAVE_OPTPROBES
afd66255 MH	107	bool
1f5a4ad9 RM	108	#
	109	# An arch should select this if it provides all these things:
	110	#
	111	# task_pt_regs() in asm/processor.h or asm/ptrace.h
	112	# arch_has_single_step() if there is hardware single-step support
	113	# arch_has_block_step() if there is hardware block-step support
1f5a4ad9 RM	114	# asm/syscall.h supplying asm-generic/syscall.h interface
	115	# linux/regset.h user_regset interfaces
	116	# CORE_DUMP_USE_REGSET #define'd in linux/elf.h
	117	# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit}
	118	# TIF_NOTIFY_RESUME calls tracehook_notify_resume()
	119	# signal delivery calls tracehook_signal_handler()
	120	#
	121	config HAVE_ARCH_TRACEHOOK
9ba16087	122	bool
1f5a4ad9	123
74bc7cee	124	config HAVE_DMA_ATTRS
9ba16087	125	bool
3d442233 JA	126
3d442233 JA	127	config USE_GENERIC_SMP_HELPERS
9ba16087	128	bool
9483a578	129
f850c30c HC	130	config HAVE_REGS_AND_STACK_ACCESS_API
f850c30c HC	131	bool
e01292b1 HC	132	help
	133	This symbol should be selected by an architecure if it supports
	134	the API needed to access registers and stack entries from pt_regs,
	135	declared in asm/ptrace.h
	136	For example the kprobes-based event tracer needs this API.
f850c30c	137
9483a578	138	config HAVE_CLK
9ba16087	139	bool
9483a578 DB	140	help
	141	The <linux/clk.h> calls support software clock gating and
	142	thus are a key power management tool on many systems.
	143
5ee00bd4 JR	144	config HAVE_DMA_API_DEBUG
5ee00bd4 JR	145	bool
36cd3c9f HC	146
	147	config HAVE_DEFAULT_NO_SPIN_MUTEXES
	148	bool
62a038d3 P	149
	150	config HAVE_HW_BREAKPOINT
	151	bool
99e8c5a3	152	depends on PERF_EVENTS
62a038d3	153
0102752e FW	154	config HAVE_MIXED_BREAKPOINTS_REGS
	155	bool
	156	depends on HAVE_HW_BREAKPOINT
	157	help
	158	Depending on the arch implementation of hardware breakpoints,
	159	some of them have separate registers for data and instruction
	160	breakpoints addresses, others have mixed registers to store
	161	them but define the access type in a control register.
	162	Select this option if your arch implements breakpoints under the
	163	latter fashion.
	164
7c68af6e AK	165	config HAVE_USER_RETURN_NOTIFIER
7c68af6e AK	166	bool
a1922ed6	167
c01d4323 FW	168	config HAVE_PERF_EVENTS_NMI
c01d4323 FW	169	bool
23637d47 FW	170	help
	171	System hardware can generate an NMI using the perf event
	172	subsystem. Also has support for calculating CPU cycle events
	173	to determine how many clock cycles in a given period.
c01d4323	174
bf5438fc JB	175	config HAVE_ARCH_JUMP_LABEL
	176	bool
	177
335d7afb GS	178	config HAVE_ARCH_MUTEX_CPU_RELAX
	179	bool
	180
2521f2c2	181	source "kernel/gcov/Kconfig"