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Mathieu Desnoyersfb32e032008-02-02 15:10:33 -05001#
2# General architecture dependent options
3#
Mathieu Desnoyers125e5642008-02-02 15:10:36 -05004
5config OPROFILE
Robert Richterb309a292010-02-26 15:01:23 +01006 tristate "OProfile system profiling"
Mathieu Desnoyers125e5642008-02-02 15:10:36 -05007 depends on PROFILING
8 depends on HAVE_OPROFILE
Ingo Molnard69d59f2008-12-12 09:38:57 +01009 select RING_BUFFER
Christian Borntraeger9a5963e2009-09-16 21:56:49 +020010 select RING_BUFFER_ALLOW_SWAP
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050011 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
Jason Yeh4d4036e2009-07-08 13:49:38 +020018config 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
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050030config HAVE_OPROFILE
Jan Beulich9ba16082008-10-15 22:01:38 -070031 bool
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050032
Robert Richterdcfce4a2011-10-11 17:11:08 +020033config OPROFILE_NMI_TIMER
34 def_bool y
35 depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI
36
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050037config KPROBES
38 bool "Kprobes"
Masami Hiramatsu05ed1602010-09-13 19:25:41 +090039 depends on MODULES
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050040 depends on HAVE_KPROBES
Masami Hiramatsu05ed1602010-09-13 19:25:41 +090041 select KALLSYMS
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050042 help
43 Kprobes allows you to trap at almost any kernel address and
44 execute a callback function. register_kprobe() establishes
45 a probepoint and specifies the callback. Kprobes is useful
46 for kernel debugging, non-intrusive instrumentation and testing.
47 If in doubt, say "N".
48
Steven Rostedt45f81b12010-10-29 12:33:43 -040049config JUMP_LABEL
50 bool "Optimize trace point call sites"
51 depends on HAVE_ARCH_JUMP_LABEL
52 help
53 If it is detected that the compiler has support for "asm goto",
54 the kernel will compile trace point locations with just a
55 nop instruction. When trace points are enabled, the nop will
56 be converted to a jump to the trace function. This technique
57 lowers overhead and stress on the branch prediction of the
58 processor.
59
60 On i386, options added to the compiler flags may increase
61 the size of the kernel slightly.
62
Masami Hiramatsuafd66252010-02-25 08:34:07 -050063config OPTPROBES
Masami Hiramatsu5cc718b2010-03-15 13:00:54 -040064 def_bool y
65 depends on KPROBES && HAVE_OPTPROBES
Masami Hiramatsuafd66252010-02-25 08:34:07 -050066 depends on !PREEMPT
Masami Hiramatsuafd66252010-02-25 08:34:07 -050067
Johannes Berg58340a02008-07-25 01:45:33 -070068config HAVE_EFFICIENT_UNALIGNED_ACCESS
Jan Beulich9ba16082008-10-15 22:01:38 -070069 bool
Johannes Berg58340a02008-07-25 01:45:33 -070070 help
71 Some architectures are unable to perform unaligned accesses
72 without the use of get_unaligned/put_unaligned. Others are
73 unable to perform such accesses efficiently (e.g. trap on
74 unaligned access and require fixing it up in the exception
75 handler.)
76
77 This symbol should be selected by an architecture if it can
78 perform unaligned accesses efficiently to allow different
79 code paths to be selected for these cases. Some network
80 drivers, for example, could opt to not fix up alignment
81 problems with received packets if doing so would not help
82 much.
83
84 See Documentation/unaligned-memory-access.txt for more
85 information on the topic of unaligned memory accesses.
86
Heiko Carstens1a94bc32009-01-14 14:13:59 +010087config HAVE_SYSCALL_WRAPPERS
88 bool
89
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080090config KRETPROBES
91 def_bool y
92 depends on KPROBES && HAVE_KRETPROBES
93
Avi Kivity7c68af62009-09-19 09:40:22 +030094config USER_RETURN_NOTIFIER
95 bool
96 depends on HAVE_USER_RETURN_NOTIFIER
97 help
98 Provide a kernel-internal notification when a cpu is about to
99 switch to user mode.
100
Rik van Riel28b2ee22008-07-23 21:27:05 -0700101config HAVE_IOREMAP_PROT
Jan Beulich9ba16082008-10-15 22:01:38 -0700102 bool
Rik van Riel28b2ee22008-07-23 21:27:05 -0700103
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500104config HAVE_KPROBES
Jan Beulich9ba16082008-10-15 22:01:38 -0700105 bool
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -0800106
107config HAVE_KRETPROBES
Jan Beulich9ba16082008-10-15 22:01:38 -0700108 bool
Arthur Kepner74bc7ce2008-04-29 01:00:30 -0700109
Masami Hiramatsuafd66252010-02-25 08:34:07 -0500110config HAVE_OPTPROBES
111 bool
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700112#
113# An arch should select this if it provides all these things:
114#
115# task_pt_regs() in asm/processor.h or asm/ptrace.h
116# arch_has_single_step() if there is hardware single-step support
117# arch_has_block_step() if there is hardware block-step support
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700118# asm/syscall.h supplying asm-generic/syscall.h interface
119# linux/regset.h user_regset interfaces
120# CORE_DUMP_USE_REGSET #define'd in linux/elf.h
121# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit}
122# TIF_NOTIFY_RESUME calls tracehook_notify_resume()
123# signal delivery calls tracehook_signal_handler()
124#
125config HAVE_ARCH_TRACEHOOK
Jan Beulich9ba16082008-10-15 22:01:38 -0700126 bool
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700127
Arthur Kepner74bc7ce2008-04-29 01:00:30 -0700128config HAVE_DMA_ATTRS
Jan Beulich9ba16082008-10-15 22:01:38 -0700129 bool
Jens Axboe3d442232008-06-26 11:21:34 +0200130
131config USE_GENERIC_SMP_HELPERS
Jan Beulich9ba16082008-10-15 22:01:38 -0700132 bool
David Brownell9483a572008-07-23 21:26:48 -0700133
Heiko Carstensf850c30c2010-02-10 17:25:17 +0100134config HAVE_REGS_AND_STACK_ACCESS_API
135 bool
Heiko Carstense01292b2010-02-18 14:25:21 +0100136 help
137 This symbol should be selected by an architecure if it supports
138 the API needed to access registers and stack entries from pt_regs,
139 declared in asm/ptrace.h
140 For example the kprobes-based event tracer needs this API.
Heiko Carstensf850c30c2010-02-10 17:25:17 +0100141
David Brownell9483a572008-07-23 21:26:48 -0700142config HAVE_CLK
Jan Beulich9ba16082008-10-15 22:01:38 -0700143 bool
David Brownell9483a572008-07-23 21:26:48 -0700144 help
145 The <linux/clk.h> calls support software clock gating and
146 thus are a key power management tool on many systems.
147
Joerg Roedel5ee00bd2009-01-09 12:14:24 +0100148config HAVE_DMA_API_DEBUG
149 bool
Heiko Carstens36cd3c92009-04-09 18:48:34 +0200150
K.Prasad62a038d2009-06-01 23:43:33 +0530151config HAVE_HW_BREAKPOINT
152 bool
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +0100153 depends on PERF_EVENTS
K.Prasad62a038d2009-06-01 23:43:33 +0530154
Frederic Weisbecker01027522010-04-11 18:55:56 +0200155config HAVE_MIXED_BREAKPOINTS_REGS
156 bool
157 depends on HAVE_HW_BREAKPOINT
158 help
159 Depending on the arch implementation of hardware breakpoints,
160 some of them have separate registers for data and instruction
161 breakpoints addresses, others have mixed registers to store
162 them but define the access type in a control register.
163 Select this option if your arch implements breakpoints under the
164 latter fashion.
165
Avi Kivity7c68af62009-09-19 09:40:22 +0300166config HAVE_USER_RETURN_NOTIFIER
167 bool
Ingo Molnara1922ed2009-09-07 08:19:51 +0200168
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200169config HAVE_PERF_EVENTS_NMI
170 bool
Frederic Weisbecker23637d42010-05-15 23:15:20 +0200171 help
172 System hardware can generate an NMI using the perf event
173 subsystem. Also has support for calculating CPU cycle events
174 to determine how many clock cycles in a given period.
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200175
Jason Baronbf5438fc2010-09-17 11:09:00 -0400176config HAVE_ARCH_JUMP_LABEL
177 bool
178
Gerald Schaefer335d7af2010-11-22 15:47:36 +0100179config HAVE_ARCH_MUTEX_CPU_RELAX
180 bool
181
Peter Zijlstra26723912011-05-24 17:12:00 -0700182config HAVE_RCU_TABLE_FREE
183 bool
184
Huang Yingdf013ff2011-07-13 13:14:22 +0800185config ARCH_HAVE_NMI_SAFE_CMPXCHG
186 bool
187
Heiko Carstens43570fd2012-01-12 17:17:27 -0800188config HAVE_ALIGNED_STRUCT_PAGE
189 bool
190 help
191 This makes sure that struct pages are double word aligned and that
192 e.g. the SLUB allocator can perform double word atomic operations
193 on a struct page for better performance. However selecting this
194 might increase the size of a struct page by a word.
195
Heiko Carstens41561532012-01-12 17:17:30 -0800196config HAVE_CMPXCHG_LOCAL
197 bool
198
Heiko Carstens25654092012-01-12 17:17:33 -0800199config HAVE_CMPXCHG_DOUBLE
200 bool
201
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700202source "kernel/gcov/Kconfig"