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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
33config KPROBES
34 bool "Kprobes"
Masami Hiramatsu05ed1602010-09-13 19:25:41 +090035 depends on MODULES
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050036 depends on HAVE_KPROBES
Masami Hiramatsu05ed1602010-09-13 19:25:41 +090037 select KALLSYMS
Mathieu Desnoyers125e5642008-02-02 15:10:36 -050038 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
Steven Rostedt45f81b12010-10-29 12:33:43 -040045config 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
Masami Hiramatsuafd66252010-02-25 08:34:07 -050059config OPTPROBES
Masami Hiramatsu5cc718b2010-03-15 13:00:54 -040060 def_bool y
61 depends on KPROBES && HAVE_OPTPROBES
Masami Hiramatsuafd66252010-02-25 08:34:07 -050062 depends on !PREEMPT
Masami Hiramatsuafd66252010-02-25 08:34:07 -050063
Johannes Berg58340a02008-07-25 01:45:33 -070064config HAVE_EFFICIENT_UNALIGNED_ACCESS
Jan Beulich9ba16082008-10-15 22:01:38 -070065 bool
Johannes Berg58340a02008-07-25 01:45:33 -070066 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
Heiko Carstens1a94bc32009-01-14 14:13:59 +010083config HAVE_SYSCALL_WRAPPERS
84 bool
85
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080086config KRETPROBES
87 def_bool y
88 depends on KPROBES && HAVE_KRETPROBES
89
Avi Kivity7c68af62009-09-19 09:40:22 +030090config 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
Rik van Riel28b2ee22008-07-23 21:27:05 -070097config HAVE_IOREMAP_PROT
Jan Beulich9ba16082008-10-15 22:01:38 -070098 bool
Rik van Riel28b2ee22008-07-23 21:27:05 -070099
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500100config HAVE_KPROBES
Jan Beulich9ba16082008-10-15 22:01:38 -0700101 bool
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -0800102
103config HAVE_KRETPROBES
Jan Beulich9ba16082008-10-15 22:01:38 -0700104 bool
Arthur Kepner74bc7ce2008-04-29 01:00:30 -0700105
Masami Hiramatsuafd66252010-02-25 08:34:07 -0500106config HAVE_OPTPROBES
107 bool
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700108#
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
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700114# 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#
121config HAVE_ARCH_TRACEHOOK
Jan Beulich9ba16082008-10-15 22:01:38 -0700122 bool
Roland McGrath1f5a4ad2008-07-25 19:45:57 -0700123
Arthur Kepner74bc7ce2008-04-29 01:00:30 -0700124config HAVE_DMA_ATTRS
Jan Beulich9ba16082008-10-15 22:01:38 -0700125 bool
Jens Axboe3d442232008-06-26 11:21:34 +0200126
127config USE_GENERIC_SMP_HELPERS
Jan Beulich9ba16082008-10-15 22:01:38 -0700128 bool
David Brownell9483a572008-07-23 21:26:48 -0700129
Heiko Carstensf850c302010-02-10 17:25:17 +0100130config HAVE_REGS_AND_STACK_ACCESS_API
131 bool
Heiko Carstense01292b2010-02-18 14:25:21 +0100132 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.
Heiko Carstensf850c302010-02-10 17:25:17 +0100137
David Brownell9483a572008-07-23 21:26:48 -0700138config HAVE_CLK
Jan Beulich9ba16082008-10-15 22:01:38 -0700139 bool
David Brownell9483a572008-07-23 21:26:48 -0700140 help
141 The <linux/clk.h> calls support software clock gating and
142 thus are a key power management tool on many systems.
143
Joerg Roedel5ee00bd2009-01-09 12:14:24 +0100144config HAVE_DMA_API_DEBUG
145 bool
Heiko Carstens36cd3c92009-04-09 18:48:34 +0200146
K.Prasad62a038d2009-06-01 23:43:33 +0530147config HAVE_HW_BREAKPOINT
148 bool
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +0100149 depends on PERF_EVENTS
K.Prasad62a038d2009-06-01 23:43:33 +0530150
Frederic Weisbecker01027522010-04-11 18:55:56 +0200151config HAVE_MIXED_BREAKPOINTS_REGS
152 bool
153 depends on HAVE_HW_BREAKPOINT
154 help
155 Depending on the arch implementation of hardware breakpoints,
156 some of them have separate registers for data and instruction
157 breakpoints addresses, others have mixed registers to store
158 them but define the access type in a control register.
159 Select this option if your arch implements breakpoints under the
160 latter fashion.
161
Avi Kivity7c68af62009-09-19 09:40:22 +0300162config HAVE_USER_RETURN_NOTIFIER
163 bool
Ingo Molnara1922ed2009-09-07 08:19:51 +0200164
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200165config HAVE_PERF_EVENTS_NMI
166 bool
Frederic Weisbecker23637d42010-05-15 23:15:20 +0200167 help
168 System hardware can generate an NMI using the perf event
169 subsystem. Also has support for calculating CPU cycle events
170 to determine how many clock cycles in a given period.
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200171
Jason Baronbf5438fc2010-09-17 11:09:00 -0400172config HAVE_ARCH_JUMP_LABEL
173 bool
174
Gerald Schaefer335d7af2010-11-22 15:47:36 +0100175config HAVE_ARCH_MUTEX_CPU_RELAX
176 bool
177
Peter Zijlstra26723912011-05-24 17:12:00 -0700178config HAVE_RCU_TABLE_FREE
179 bool
180
Huang Yingdf013ff2011-07-13 13:14:22 +0800181config ARCH_HAVE_NMI_SAFE_CMPXCHG
182 bool
183
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700184source "kernel/gcov/Kconfig"