Eric Lee / smarc-ti-linux-kernel

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Commit ee7e5516be4f2107535ad5a3d47d9c79f93661a2

Authored by Dmitry Baryshkov
Committed by Ingo Molnar
1 parent 543cf4cb3f
Exists in master and in 20 other branches dlt-processor-sdk-linux-03.00.00.04, newt-ti-linux-3.12.y, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.12.10, smarc-ti-linux-3.12.y, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.12.y, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

generic: per-device coherent dma allocator 

Currently x86_32, sh and cris-v32 provide per-device coherent dma
memory allocator.

However their implementation is nearly identical. Refactor out
common code to be reused by them.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Showing 4 changed files with 164 additions and 0 deletions Inline Diff

include/asm-generic/dma-coherent.h
Diff comments   View file @ ee7e551
File was created 1 #ifndef DMA_COHERENT_H
2 #define DMA_COHERENT_H
3
4 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
5 /*
6 * These two functions are only for dma allocator.
7 * Don't use them in device drivers.
8 */
9 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
10 dma_addr_t *dma_handle, void **ret);
11 int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
12
13 /*
14 * Standard interface
15 */
16 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
17 extern int
18 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
19 dma_addr_t device_addr, size_t size, int flags);
20
21 extern void
22 dma_release_declared_memory(struct device *dev);
23
24 extern void *
25 dma_mark_declared_memory_occupied(struct device *dev,
26 dma_addr_t device_addr, size_t size);
27 #else
28 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
29 #define dma_release_from_coherent(dev, order, vaddr) (0)
30 #endif
31
32 #endif
33
1 config ARCH 1 config ARCH
2 string 2 string
3 option env="ARCH" 3 option env="ARCH"
4 4
5 config KERNELVERSION 5 config KERNELVERSION
6 string 6 string
7 option env="KERNELVERSION" 7 option env="KERNELVERSION"
8 8
9 config DEFCONFIG_LIST 9 config DEFCONFIG_LIST
10 string 10 string
11 depends on !UML 11 depends on !UML
12 option defconfig_list 12 option defconfig_list
13 default "/lib/modules/$UNAME_RELEASE/.config" 13 default "/lib/modules/$UNAME_RELEASE/.config"
14 default "/etc/kernel-config" 14 default "/etc/kernel-config"
15 default "/boot/config-$UNAME_RELEASE" 15 default "/boot/config-$UNAME_RELEASE"
16 default "$ARCH_DEFCONFIG" 16 default "$ARCH_DEFCONFIG"
17 default "arch/$ARCH/defconfig" 17 default "arch/$ARCH/defconfig"
18 18
19 menu "General setup" 19 menu "General setup"
20 20
21 config EXPERIMENTAL 21 config EXPERIMENTAL
22 bool "Prompt for development and/or incomplete code/drivers" 22 bool "Prompt for development and/or incomplete code/drivers"
23 ---help--- 23 ---help---
24 Some of the various things that Linux supports (such as network 24 Some of the various things that Linux supports (such as network
25 drivers, file systems, network protocols, etc.) can be in a state 25 drivers, file systems, network protocols, etc.) can be in a state
26 of development where the functionality, stability, or the level of 26 of development where the functionality, stability, or the level of
27 testing is not yet high enough for general use. This is usually 27 testing is not yet high enough for general use. This is usually
28 known as the "alpha-test" phase among developers. If a feature is 28 known as the "alpha-test" phase among developers. If a feature is
29 currently in alpha-test, then the developers usually discourage 29 currently in alpha-test, then the developers usually discourage
30 uninformed widespread use of this feature by the general public to 30 uninformed widespread use of this feature by the general public to
31 avoid "Why doesn't this work?" type mail messages. However, active 31 avoid "Why doesn't this work?" type mail messages. However, active
32 testing and use of these systems is welcomed. Just be aware that it 32 testing and use of these systems is welcomed. Just be aware that it
33 may not meet the normal level of reliability or it may fail to work 33 may not meet the normal level of reliability or it may fail to work
34 in some special cases. Detailed bug reports from people familiar 34 in some special cases. Detailed bug reports from people familiar
35 with the kernel internals are usually welcomed by the developers 35 with the kernel internals are usually welcomed by the developers
36 (before submitting bug reports, please read the documents 36 (before submitting bug reports, please read the documents
37 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, 37 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
38 <file:Documentation/BUG-HUNTING>, and 38 <file:Documentation/BUG-HUNTING>, and
39 <file:Documentation/oops-tracing.txt> in the kernel source). 39 <file:Documentation/oops-tracing.txt> in the kernel source).
40 40
41 This option will also make obsoleted drivers available. These are 41 This option will also make obsoleted drivers available. These are
42 drivers that have been replaced by something else, and/or are 42 drivers that have been replaced by something else, and/or are
43 scheduled to be removed in a future kernel release. 43 scheduled to be removed in a future kernel release.
44 44
45 Unless you intend to help test and develop a feature or driver that 45 Unless you intend to help test and develop a feature or driver that
46 falls into this category, or you have a situation that requires 46 falls into this category, or you have a situation that requires
47 using these features, you should probably say N here, which will 47 using these features, you should probably say N here, which will
48 cause the configurator to present you with fewer choices. If 48 cause the configurator to present you with fewer choices. If
49 you say Y here, you will be offered the choice of using features or 49 you say Y here, you will be offered the choice of using features or
50 drivers that are currently considered to be in the alpha-test phase. 50 drivers that are currently considered to be in the alpha-test phase.
51 51
52 config BROKEN 52 config BROKEN
53 bool 53 bool
54 54
55 config BROKEN_ON_SMP 55 config BROKEN_ON_SMP
56 bool 56 bool
57 depends on BROKEN || !SMP 57 depends on BROKEN || !SMP
58 default y 58 default y
59 59
60 config LOCK_KERNEL 60 config LOCK_KERNEL
61 bool 61 bool
62 depends on SMP || PREEMPT 62 depends on SMP || PREEMPT
63 default y 63 default y
64 64
65 config INIT_ENV_ARG_LIMIT 65 config INIT_ENV_ARG_LIMIT
66 int 66 int
67 default 32 if !UML 67 default 32 if !UML
68 default 128 if UML 68 default 128 if UML
69 help 69 help
70 Maximum of each of the number of arguments and environment 70 Maximum of each of the number of arguments and environment
71 variables passed to init from the kernel command line. 71 variables passed to init from the kernel command line.
72 72
73 73
74 config LOCALVERSION 74 config LOCALVERSION
75 string "Local version - append to kernel release" 75 string "Local version - append to kernel release"
76 help 76 help
77 Append an extra string to the end of your kernel version. 77 Append an extra string to the end of your kernel version.
78 This will show up when you type uname, for example. 78 This will show up when you type uname, for example.
79 The string you set here will be appended after the contents of 79 The string you set here will be appended after the contents of
80 any files with a filename matching localversion* in your 80 any files with a filename matching localversion* in your
81 object and source tree, in that order. Your total string can 81 object and source tree, in that order. Your total string can
82 be a maximum of 64 characters. 82 be a maximum of 64 characters.
83 83
84 config LOCALVERSION_AUTO 84 config LOCALVERSION_AUTO
85 bool "Automatically append version information to the version string" 85 bool "Automatically append version information to the version string"
86 default y 86 default y
87 help 87 help
88 This will try to automatically determine if the current tree is a 88 This will try to automatically determine if the current tree is a
89 release tree by looking for git tags that belong to the current 89 release tree by looking for git tags that belong to the current
90 top of tree revision. 90 top of tree revision.
91 91
92 A string of the format -gxxxxxxxx will be added to the localversion 92 A string of the format -gxxxxxxxx will be added to the localversion
93 if a git-based tree is found. The string generated by this will be 93 if a git-based tree is found. The string generated by this will be
94 appended after any matching localversion* files, and after the value 94 appended after any matching localversion* files, and after the value
95 set in CONFIG_LOCALVERSION. 95 set in CONFIG_LOCALVERSION.
96 96
97 (The actual string used here is the first eight characters produced 97 (The actual string used here is the first eight characters produced
98 by running the command: 98 by running the command:
99 99
100 $ git rev-parse --verify HEAD 100 $ git rev-parse --verify HEAD
101 101
102 which is done within the script "scripts/setlocalversion".) 102 which is done within the script "scripts/setlocalversion".)
103 103
104 config SWAP 104 config SWAP
105 bool "Support for paging of anonymous memory (swap)" 105 bool "Support for paging of anonymous memory (swap)"
106 depends on MMU && BLOCK 106 depends on MMU && BLOCK
107 default y 107 default y
108 help 108 help
109 This option allows you to choose whether you want to have support 109 This option allows you to choose whether you want to have support
110 for so called swap devices or swap files in your kernel that are 110 for so called swap devices or swap files in your kernel that are
111 used to provide more virtual memory than the actual RAM present 111 used to provide more virtual memory than the actual RAM present
112 in your computer. If unsure say Y. 112 in your computer. If unsure say Y.
113 113
114 config SYSVIPC 114 config SYSVIPC
115 bool "System V IPC" 115 bool "System V IPC"
116 ---help--- 116 ---help---
117 Inter Process Communication is a suite of library functions and 117 Inter Process Communication is a suite of library functions and
118 system calls which let processes (running programs) synchronize and 118 system calls which let processes (running programs) synchronize and
119 exchange information. It is generally considered to be a good thing, 119 exchange information. It is generally considered to be a good thing,
120 and some programs won't run unless you say Y here. In particular, if 120 and some programs won't run unless you say Y here. In particular, if
121 you want to run the DOS emulator dosemu under Linux (read the 121 you want to run the DOS emulator dosemu under Linux (read the
122 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), 122 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
123 you'll need to say Y here. 123 you'll need to say Y here.
124 124
125 You can find documentation about IPC with "info ipc" and also in 125 You can find documentation about IPC with "info ipc" and also in
126 section 6.4 of the Linux Programmer's Guide, available from 126 section 6.4 of the Linux Programmer's Guide, available from
127 <http://www.tldp.org/guides.html>. 127 <http://www.tldp.org/guides.html>.
128 128
129 config SYSVIPC_SYSCTL 129 config SYSVIPC_SYSCTL
130 bool 130 bool
131 depends on SYSVIPC 131 depends on SYSVIPC
132 depends on SYSCTL 132 depends on SYSCTL
133 default y 133 default y
134 134
135 config POSIX_MQUEUE 135 config POSIX_MQUEUE
136 bool "POSIX Message Queues" 136 bool "POSIX Message Queues"
137 depends on NET && EXPERIMENTAL 137 depends on NET && EXPERIMENTAL
138 ---help--- 138 ---help---
139 POSIX variant of message queues is a part of IPC. In POSIX message 139 POSIX variant of message queues is a part of IPC. In POSIX message
140 queues every message has a priority which decides about succession 140 queues every message has a priority which decides about succession
141 of receiving it by a process. If you want to compile and run 141 of receiving it by a process. If you want to compile and run
142 programs written e.g. for Solaris with use of its POSIX message 142 programs written e.g. for Solaris with use of its POSIX message
143 queues (functions mq_*) say Y here. 143 queues (functions mq_*) say Y here.
144 144
145 POSIX message queues are visible as a filesystem called 'mqueue' 145 POSIX message queues are visible as a filesystem called 'mqueue'
146 and can be mounted somewhere if you want to do filesystem 146 and can be mounted somewhere if you want to do filesystem
147 operations on message queues. 147 operations on message queues.
148 148
149 If unsure, say Y. 149 If unsure, say Y.
150 150
151 config BSD_PROCESS_ACCT 151 config BSD_PROCESS_ACCT
152 bool "BSD Process Accounting" 152 bool "BSD Process Accounting"
153 help 153 help
154 If you say Y here, a user level program will be able to instruct the 154 If you say Y here, a user level program will be able to instruct the
155 kernel (via a special system call) to write process accounting 155 kernel (via a special system call) to write process accounting
156 information to a file: whenever a process exits, information about 156 information to a file: whenever a process exits, information about
157 that process will be appended to the file by the kernel. The 157 that process will be appended to the file by the kernel. The
158 information includes things such as creation time, owning user, 158 information includes things such as creation time, owning user,
159 command name, memory usage, controlling terminal etc. (the complete 159 command name, memory usage, controlling terminal etc. (the complete
160 list is in the struct acct in <file:include/linux/acct.h>). It is 160 list is in the struct acct in <file:include/linux/acct.h>). It is
161 up to the user level program to do useful things with this 161 up to the user level program to do useful things with this
162 information. This is generally a good idea, so say Y. 162 information. This is generally a good idea, so say Y.
163 163
164 config BSD_PROCESS_ACCT_V3 164 config BSD_PROCESS_ACCT_V3
165 bool "BSD Process Accounting version 3 file format" 165 bool "BSD Process Accounting version 3 file format"
166 depends on BSD_PROCESS_ACCT 166 depends on BSD_PROCESS_ACCT
167 default n 167 default n
168 help 168 help
169 If you say Y here, the process accounting information is written 169 If you say Y here, the process accounting information is written
170 in a new file format that also logs the process IDs of each 170 in a new file format that also logs the process IDs of each
171 process and it's parent. Note that this file format is incompatible 171 process and it's parent. Note that this file format is incompatible
172 with previous v0/v1/v2 file formats, so you will need updated tools 172 with previous v0/v1/v2 file formats, so you will need updated tools
173 for processing it. A preliminary version of these tools is available 173 for processing it. A preliminary version of these tools is available
174 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>. 174 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
175 175
176 config TASKSTATS 176 config TASKSTATS
177 bool "Export task/process statistics through netlink (EXPERIMENTAL)" 177 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
178 depends on NET 178 depends on NET
179 default n 179 default n
180 help 180 help
181 Export selected statistics for tasks/processes through the 181 Export selected statistics for tasks/processes through the
182 generic netlink interface. Unlike BSD process accounting, the 182 generic netlink interface. Unlike BSD process accounting, the
183 statistics are available during the lifetime of tasks/processes as 183 statistics are available during the lifetime of tasks/processes as
184 responses to commands. Like BSD accounting, they are sent to user 184 responses to commands. Like BSD accounting, they are sent to user
185 space on task exit. 185 space on task exit.
186 186
187 Say N if unsure. 187 Say N if unsure.
188 188
189 config TASK_DELAY_ACCT 189 config TASK_DELAY_ACCT
190 bool "Enable per-task delay accounting (EXPERIMENTAL)" 190 bool "Enable per-task delay accounting (EXPERIMENTAL)"
191 depends on TASKSTATS 191 depends on TASKSTATS
192 help 192 help
193 Collect information on time spent by a task waiting for system 193 Collect information on time spent by a task waiting for system
194 resources like cpu, synchronous block I/O completion and swapping 194 resources like cpu, synchronous block I/O completion and swapping
195 in pages. Such statistics can help in setting a task's priorities 195 in pages. Such statistics can help in setting a task's priorities
196 relative to other tasks for cpu, io, rss limits etc. 196 relative to other tasks for cpu, io, rss limits etc.
197 197
198 Say N if unsure. 198 Say N if unsure.
199 199
200 config TASK_XACCT 200 config TASK_XACCT
201 bool "Enable extended accounting over taskstats (EXPERIMENTAL)" 201 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
202 depends on TASKSTATS 202 depends on TASKSTATS
203 help 203 help
204 Collect extended task accounting data and send the data 204 Collect extended task accounting data and send the data
205 to userland for processing over the taskstats interface. 205 to userland for processing over the taskstats interface.
206 206
207 Say N if unsure. 207 Say N if unsure.
208 208
209 config TASK_IO_ACCOUNTING 209 config TASK_IO_ACCOUNTING
210 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" 210 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
211 depends on TASK_XACCT 211 depends on TASK_XACCT
212 help 212 help
213 Collect information on the number of bytes of storage I/O which this 213 Collect information on the number of bytes of storage I/O which this
214 task has caused. 214 task has caused.
215 215
216 Say N if unsure. 216 Say N if unsure.
217 217
218 config AUDIT 218 config AUDIT
219 bool "Auditing support" 219 bool "Auditing support"
220 depends on NET 220 depends on NET
221 help 221 help
222 Enable auditing infrastructure that can be used with another 222 Enable auditing infrastructure that can be used with another
223 kernel subsystem, such as SELinux (which requires this for 223 kernel subsystem, such as SELinux (which requires this for
224 logging of avc messages output). Does not do system-call 224 logging of avc messages output). Does not do system-call
225 auditing without CONFIG_AUDITSYSCALL. 225 auditing without CONFIG_AUDITSYSCALL.
226 226
227 config AUDITSYSCALL 227 config AUDITSYSCALL
228 bool "Enable system-call auditing support" 228 bool "Enable system-call auditing support"
229 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH) 229 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
230 default y if SECURITY_SELINUX 230 default y if SECURITY_SELINUX
231 help 231 help
232 Enable low-overhead system-call auditing infrastructure that 232 Enable low-overhead system-call auditing infrastructure that
233 can be used independently or with another kernel subsystem, 233 can be used independently or with another kernel subsystem,
234 such as SELinux. To use audit's filesystem watch feature, please 234 such as SELinux. To use audit's filesystem watch feature, please
235 ensure that INOTIFY is configured. 235 ensure that INOTIFY is configured.
236 236
237 config AUDIT_TREE 237 config AUDIT_TREE
238 def_bool y 238 def_bool y
239 depends on AUDITSYSCALL && INOTIFY 239 depends on AUDITSYSCALL && INOTIFY
240 240
241 config IKCONFIG 241 config IKCONFIG
242 tristate "Kernel .config support" 242 tristate "Kernel .config support"
243 ---help--- 243 ---help---
244 This option enables the complete Linux kernel ".config" file 244 This option enables the complete Linux kernel ".config" file
245 contents to be saved in the kernel. It provides documentation 245 contents to be saved in the kernel. It provides documentation
246 of which kernel options are used in a running kernel or in an 246 of which kernel options are used in a running kernel or in an
247 on-disk kernel. This information can be extracted from the kernel 247 on-disk kernel. This information can be extracted from the kernel
248 image file with the script scripts/extract-ikconfig and used as 248 image file with the script scripts/extract-ikconfig and used as
249 input to rebuild the current kernel or to build another kernel. 249 input to rebuild the current kernel or to build another kernel.
250 It can also be extracted from a running kernel by reading 250 It can also be extracted from a running kernel by reading
251 /proc/config.gz if enabled (below). 251 /proc/config.gz if enabled (below).
252 252
253 config IKCONFIG_PROC 253 config IKCONFIG_PROC
254 bool "Enable access to .config through /proc/config.gz" 254 bool "Enable access to .config through /proc/config.gz"
255 depends on IKCONFIG && PROC_FS 255 depends on IKCONFIG && PROC_FS
256 ---help--- 256 ---help---
257 This option enables access to the kernel configuration file 257 This option enables access to the kernel configuration file
258 through /proc/config.gz. 258 through /proc/config.gz.
259 259
260 config LOG_BUF_SHIFT 260 config LOG_BUF_SHIFT
261 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" 261 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
262 range 12 21 262 range 12 21
263 default 17 263 default 17
264 help 264 help
265 Select kernel log buffer size as a power of 2. 265 Select kernel log buffer size as a power of 2.
266 Examples: 266 Examples:
267 17 => 128 KB 267 17 => 128 KB
268 16 => 64 KB 268 16 => 64 KB
269 15 => 32 KB 269 15 => 32 KB
270 14 => 16 KB 270 14 => 16 KB
271 13 => 8 KB 271 13 => 8 KB
272 12 => 4 KB 272 12 => 4 KB
273 273
274 config CGROUPS 274 config CGROUPS
275 bool "Control Group support" 275 bool "Control Group support"
276 help 276 help
277 This option will let you use process cgroup subsystems 277 This option will let you use process cgroup subsystems
278 such as Cpusets 278 such as Cpusets
279 279
280 Say N if unsure. 280 Say N if unsure.
281 281
282 config CGROUP_DEBUG 282 config CGROUP_DEBUG
283 bool "Example debug cgroup subsystem" 283 bool "Example debug cgroup subsystem"
284 depends on CGROUPS 284 depends on CGROUPS
285 default n 285 default n
286 help 286 help
287 This option enables a simple cgroup subsystem that 287 This option enables a simple cgroup subsystem that
288 exports useful debugging information about the cgroups 288 exports useful debugging information about the cgroups
289 framework 289 framework
290 290
291 Say N if unsure 291 Say N if unsure
292 292
293 config CGROUP_NS 293 config CGROUP_NS
294 bool "Namespace cgroup subsystem" 294 bool "Namespace cgroup subsystem"
295 depends on CGROUPS 295 depends on CGROUPS
296 help 296 help
297 Provides a simple namespace cgroup subsystem to 297 Provides a simple namespace cgroup subsystem to
298 provide hierarchical naming of sets of namespaces, 298 provide hierarchical naming of sets of namespaces,
299 for instance virtual servers and checkpoint/restart 299 for instance virtual servers and checkpoint/restart
300 jobs. 300 jobs.
301 301
302 config CGROUP_DEVICE 302 config CGROUP_DEVICE
303 bool "Device controller for cgroups" 303 bool "Device controller for cgroups"
304 depends on CGROUPS && EXPERIMENTAL 304 depends on CGROUPS && EXPERIMENTAL
305 help 305 help
306 Provides a cgroup implementing whitelists for devices which 306 Provides a cgroup implementing whitelists for devices which
307 a process in the cgroup can mknod or open. 307 a process in the cgroup can mknod or open.
308 308
309 config CPUSETS 309 config CPUSETS
310 bool "Cpuset support" 310 bool "Cpuset support"
311 depends on SMP && CGROUPS 311 depends on SMP && CGROUPS
312 help 312 help
313 This option will let you create and manage CPUSETs which 313 This option will let you create and manage CPUSETs which
314 allow dynamically partitioning a system into sets of CPUs and 314 allow dynamically partitioning a system into sets of CPUs and
315 Memory Nodes and assigning tasks to run only within those sets. 315 Memory Nodes and assigning tasks to run only within those sets.
316 This is primarily useful on large SMP or NUMA systems. 316 This is primarily useful on large SMP or NUMA systems.
317 317
318 Say N if unsure. 318 Say N if unsure.
319 319
320 # 320 #
321 # Architectures with an unreliable sched_clock() should select this: 321 # Architectures with an unreliable sched_clock() should select this:
322 # 322 #
323 config HAVE_UNSTABLE_SCHED_CLOCK 323 config HAVE_UNSTABLE_SCHED_CLOCK
324 bool 324 bool
325 325
326 config GROUP_SCHED 326 config GROUP_SCHED
327 bool "Group CPU scheduler" 327 bool "Group CPU scheduler"
328 depends on EXPERIMENTAL 328 depends on EXPERIMENTAL
329 default n 329 default n
330 help 330 help
331 This feature lets CPU scheduler recognize task groups and control CPU 331 This feature lets CPU scheduler recognize task groups and control CPU
332 bandwidth allocation to such task groups. 332 bandwidth allocation to such task groups.
333 333
334 config FAIR_GROUP_SCHED 334 config FAIR_GROUP_SCHED
335 bool "Group scheduling for SCHED_OTHER" 335 bool "Group scheduling for SCHED_OTHER"
336 depends on GROUP_SCHED 336 depends on GROUP_SCHED
337 default GROUP_SCHED 337 default GROUP_SCHED
338 338
339 config RT_GROUP_SCHED 339 config RT_GROUP_SCHED
340 bool "Group scheduling for SCHED_RR/FIFO" 340 bool "Group scheduling for SCHED_RR/FIFO"
341 depends on EXPERIMENTAL 341 depends on EXPERIMENTAL
342 depends on GROUP_SCHED 342 depends on GROUP_SCHED
343 default n 343 default n
344 help 344 help
345 This feature lets you explicitly allocate real CPU bandwidth 345 This feature lets you explicitly allocate real CPU bandwidth
346 to users or control groups (depending on the "Basis for grouping tasks" 346 to users or control groups (depending on the "Basis for grouping tasks"
347 setting below. If enabled, it will also make it impossible to 347 setting below. If enabled, it will also make it impossible to
348 schedule realtime tasks for non-root users until you allocate 348 schedule realtime tasks for non-root users until you allocate
349 realtime bandwidth for them. 349 realtime bandwidth for them.
350 See Documentation/sched-rt-group.txt for more information. 350 See Documentation/sched-rt-group.txt for more information.
351 351
352 choice 352 choice
353 depends on GROUP_SCHED 353 depends on GROUP_SCHED
354 prompt "Basis for grouping tasks" 354 prompt "Basis for grouping tasks"
355 default USER_SCHED 355 default USER_SCHED
356 356
357 config USER_SCHED 357 config USER_SCHED
358 bool "user id" 358 bool "user id"
359 help 359 help
360 This option will choose userid as the basis for grouping 360 This option will choose userid as the basis for grouping
361 tasks, thus providing equal CPU bandwidth to each user. 361 tasks, thus providing equal CPU bandwidth to each user.
362 362
363 config CGROUP_SCHED 363 config CGROUP_SCHED
364 bool "Control groups" 364 bool "Control groups"
365 depends on CGROUPS 365 depends on CGROUPS
366 help 366 help
367 This option allows you to create arbitrary task groups 367 This option allows you to create arbitrary task groups
368 using the "cgroup" pseudo filesystem and control 368 using the "cgroup" pseudo filesystem and control
369 the cpu bandwidth allocated to each such task group. 369 the cpu bandwidth allocated to each such task group.
370 Refer to Documentation/cgroups.txt for more information 370 Refer to Documentation/cgroups.txt for more information
371 on "cgroup" pseudo filesystem. 371 on "cgroup" pseudo filesystem.
372 372
373 endchoice 373 endchoice
374 374
375 config CGROUP_CPUACCT 375 config CGROUP_CPUACCT
376 bool "Simple CPU accounting cgroup subsystem" 376 bool "Simple CPU accounting cgroup subsystem"
377 depends on CGROUPS 377 depends on CGROUPS
378 help 378 help
379 Provides a simple Resource Controller for monitoring the 379 Provides a simple Resource Controller for monitoring the
380 total CPU consumed by the tasks in a cgroup 380 total CPU consumed by the tasks in a cgroup
381 381
382 config RESOURCE_COUNTERS 382 config RESOURCE_COUNTERS
383 bool "Resource counters" 383 bool "Resource counters"
384 help 384 help
385 This option enables controller independent resource accounting 385 This option enables controller independent resource accounting
386 infrastructure that works with cgroups 386 infrastructure that works with cgroups
387 depends on CGROUPS 387 depends on CGROUPS
388 388
389 config MM_OWNER 389 config MM_OWNER
390 bool 390 bool
391 391
392 config CGROUP_MEM_RES_CTLR 392 config CGROUP_MEM_RES_CTLR
393 bool "Memory Resource Controller for Control Groups" 393 bool "Memory Resource Controller for Control Groups"
394 depends on CGROUPS && RESOURCE_COUNTERS 394 depends on CGROUPS && RESOURCE_COUNTERS
395 select MM_OWNER 395 select MM_OWNER
396 help 396 help
397 Provides a memory resource controller that manages both page cache and 397 Provides a memory resource controller that manages both page cache and
398 RSS memory. 398 RSS memory.
399 399
400 Note that setting this option increases fixed memory overhead 400 Note that setting this option increases fixed memory overhead
401 associated with each page of memory in the system by 4/8 bytes 401 associated with each page of memory in the system by 4/8 bytes
402 and also increases cache misses because struct page on many 64bit 402 and also increases cache misses because struct page on many 64bit
403 systems will not fit into a single cache line anymore. 403 systems will not fit into a single cache line anymore.
404 404
405 Only enable when you're ok with these trade offs and really 405 Only enable when you're ok with these trade offs and really
406 sure you need the memory resource controller. 406 sure you need the memory resource controller.
407 407
408 This config option also selects MM_OWNER config option, which 408 This config option also selects MM_OWNER config option, which
409 could in turn add some fork/exit overhead. 409 could in turn add some fork/exit overhead.
410 410
411 config SYSFS_DEPRECATED 411 config SYSFS_DEPRECATED
412 bool 412 bool
413 413
414 config SYSFS_DEPRECATED_V2 414 config SYSFS_DEPRECATED_V2
415 bool "Create deprecated sysfs files" 415 bool "Create deprecated sysfs files"
416 depends on SYSFS 416 depends on SYSFS
417 default y 417 default y
418 select SYSFS_DEPRECATED 418 select SYSFS_DEPRECATED
419 help 419 help
420 This option creates deprecated symlinks such as the 420 This option creates deprecated symlinks such as the
421 "device"-link, the <subsystem>:<name>-link, and the 421 "device"-link, the <subsystem>:<name>-link, and the
422 "bus"-link. It may also add deprecated key in the 422 "bus"-link. It may also add deprecated key in the
423 uevent environment. 423 uevent environment.
424 None of these features or values should be used today, as 424 None of these features or values should be used today, as
425 they export driver core implementation details to userspace 425 they export driver core implementation details to userspace
426 or export properties which can't be kept stable across kernel 426 or export properties which can't be kept stable across kernel
427 releases. 427 releases.
428 428
429 If enabled, this option will also move any device structures 429 If enabled, this option will also move any device structures
430 that belong to a class, back into the /sys/class hierarchy, in 430 that belong to a class, back into the /sys/class hierarchy, in
431 order to support older versions of udev and some userspace 431 order to support older versions of udev and some userspace
432 programs. 432 programs.
433 433
434 If you are using a distro with the most recent userspace 434 If you are using a distro with the most recent userspace
435 packages, it should be safe to say N here. 435 packages, it should be safe to say N here.
436 436
437 config PROC_PID_CPUSET 437 config PROC_PID_CPUSET
438 bool "Include legacy /proc/<pid>/cpuset file" 438 bool "Include legacy /proc/<pid>/cpuset file"
439 depends on CPUSETS 439 depends on CPUSETS
440 default y 440 default y
441 441
442 config RELAY 442 config RELAY
443 bool "Kernel->user space relay support (formerly relayfs)" 443 bool "Kernel->user space relay support (formerly relayfs)"
444 help 444 help
445 This option enables support for relay interface support in 445 This option enables support for relay interface support in
446 certain file systems (such as debugfs). 446 certain file systems (such as debugfs).
447 It is designed to provide an efficient mechanism for tools and 447 It is designed to provide an efficient mechanism for tools and
448 facilities to relay large amounts of data from kernel space to 448 facilities to relay large amounts of data from kernel space to
449 user space. 449 user space.
450 450
451 If unsure, say N. 451 If unsure, say N.
452 452
453 config NAMESPACES 453 config NAMESPACES
454 bool "Namespaces support" if EMBEDDED 454 bool "Namespaces support" if EMBEDDED
455 default !EMBEDDED 455 default !EMBEDDED
456 help 456 help
457 Provides the way to make tasks work with different objects using 457 Provides the way to make tasks work with different objects using
458 the same id. For example same IPC id may refer to different objects 458 the same id. For example same IPC id may refer to different objects
459 or same user id or pid may refer to different tasks when used in 459 or same user id or pid may refer to different tasks when used in
460 different namespaces. 460 different namespaces.
461 461
462 config UTS_NS 462 config UTS_NS
463 bool "UTS namespace" 463 bool "UTS namespace"
464 depends on NAMESPACES 464 depends on NAMESPACES
465 help 465 help
466 In this namespace tasks see different info provided with the 466 In this namespace tasks see different info provided with the
467 uname() system call 467 uname() system call
468 468
469 config IPC_NS 469 config IPC_NS
470 bool "IPC namespace" 470 bool "IPC namespace"
471 depends on NAMESPACES && SYSVIPC 471 depends on NAMESPACES && SYSVIPC
472 help 472 help
473 In this namespace tasks work with IPC ids which correspond to 473 In this namespace tasks work with IPC ids which correspond to
474 different IPC objects in different namespaces 474 different IPC objects in different namespaces
475 475
476 config USER_NS 476 config USER_NS
477 bool "User namespace (EXPERIMENTAL)" 477 bool "User namespace (EXPERIMENTAL)"
478 depends on NAMESPACES && EXPERIMENTAL 478 depends on NAMESPACES && EXPERIMENTAL
479 help 479 help
480 This allows containers, i.e. vservers, to use user namespaces 480 This allows containers, i.e. vservers, to use user namespaces
481 to provide different user info for different servers. 481 to provide different user info for different servers.
482 If unsure, say N. 482 If unsure, say N.
483 483
484 config PID_NS 484 config PID_NS
485 bool "PID Namespaces (EXPERIMENTAL)" 485 bool "PID Namespaces (EXPERIMENTAL)"
486 default n 486 default n
487 depends on NAMESPACES && EXPERIMENTAL 487 depends on NAMESPACES && EXPERIMENTAL
488 help 488 help
489 Suport process id namespaces. This allows having multiple 489 Suport process id namespaces. This allows having multiple
490 process with the same pid as long as they are in different 490 process with the same pid as long as they are in different
491 pid namespaces. This is a building block of containers. 491 pid namespaces. This is a building block of containers.
492 492
493 Unless you want to work with an experimental feature 493 Unless you want to work with an experimental feature
494 say N here. 494 say N here.
495 495
496 config BLK_DEV_INITRD 496 config BLK_DEV_INITRD
497 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" 497 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
498 depends on BROKEN || !FRV 498 depends on BROKEN || !FRV
499 help 499 help
500 The initial RAM filesystem is a ramfs which is loaded by the 500 The initial RAM filesystem is a ramfs which is loaded by the
501 boot loader (loadlin or lilo) and that is mounted as root 501 boot loader (loadlin or lilo) and that is mounted as root
502 before the normal boot procedure. It is typically used to 502 before the normal boot procedure. It is typically used to
503 load modules needed to mount the "real" root file system, 503 load modules needed to mount the "real" root file system,
504 etc. See <file:Documentation/initrd.txt> for details. 504 etc. See <file:Documentation/initrd.txt> for details.
505 505
506 If RAM disk support (BLK_DEV_RAM) is also included, this 506 If RAM disk support (BLK_DEV_RAM) is also included, this
507 also enables initial RAM disk (initrd) support and adds 507 also enables initial RAM disk (initrd) support and adds
508 15 Kbytes (more on some other architectures) to the kernel size. 508 15 Kbytes (more on some other architectures) to the kernel size.
509 509
510 If unsure say Y. 510 If unsure say Y.
511 511
512 if BLK_DEV_INITRD 512 if BLK_DEV_INITRD
513 513
514 source "usr/Kconfig" 514 source "usr/Kconfig"
515 515
516 endif 516 endif
517 517
518 config CC_OPTIMIZE_FOR_SIZE 518 config CC_OPTIMIZE_FOR_SIZE
519 bool "Optimize for size" 519 bool "Optimize for size"
520 default y 520 default y
521 help 521 help
522 Enabling this option will pass "-Os" instead of "-O2" to gcc 522 Enabling this option will pass "-Os" instead of "-O2" to gcc
523 resulting in a smaller kernel. 523 resulting in a smaller kernel.
524 524
525 If unsure, say N. 525 If unsure, say N.
526 526
527 config SYSCTL 527 config SYSCTL
528 bool 528 bool
529 529
530 menuconfig EMBEDDED 530 menuconfig EMBEDDED
531 bool "Configure standard kernel features (for small systems)" 531 bool "Configure standard kernel features (for small systems)"
532 help 532 help
533 This option allows certain base kernel options and settings 533 This option allows certain base kernel options and settings
534 to be disabled or tweaked. This is for specialized 534 to be disabled or tweaked. This is for specialized
535 environments which can tolerate a "non-standard" kernel. 535 environments which can tolerate a "non-standard" kernel.
536 Only use this if you really know what you are doing. 536 Only use this if you really know what you are doing.
537 537
538 config UID16 538 config UID16
539 bool "Enable 16-bit UID system calls" if EMBEDDED 539 bool "Enable 16-bit UID system calls" if EMBEDDED
540 depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) 540 depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
541 default y 541 default y
542 help 542 help
543 This enables the legacy 16-bit UID syscall wrappers. 543 This enables the legacy 16-bit UID syscall wrappers.
544 544
545 config SYSCTL_SYSCALL 545 config SYSCTL_SYSCALL
546 bool "Sysctl syscall support" if EMBEDDED 546 bool "Sysctl syscall support" if EMBEDDED
547 default y 547 default y
548 select SYSCTL 548 select SYSCTL
549 ---help--- 549 ---help---
550 sys_sysctl uses binary paths that have been found challenging 550 sys_sysctl uses binary paths that have been found challenging
551 to properly maintain and use. The interface in /proc/sys 551 to properly maintain and use. The interface in /proc/sys
552 using paths with ascii names is now the primary path to this 552 using paths with ascii names is now the primary path to this
553 information. 553 information.
554 554
555 Almost nothing using the binary sysctl interface so if you are 555 Almost nothing using the binary sysctl interface so if you are
556 trying to save some space it is probably safe to disable this, 556 trying to save some space it is probably safe to disable this,
557 making your kernel marginally smaller. 557 making your kernel marginally smaller.
558 558
559 If unsure say Y here. 559 If unsure say Y here.
560 560
561 config SYSCTL_SYSCALL_CHECK 561 config SYSCTL_SYSCALL_CHECK
562 bool "Sysctl checks" if EMBEDDED 562 bool "Sysctl checks" if EMBEDDED
563 depends on SYSCTL_SYSCALL 563 depends on SYSCTL_SYSCALL
564 default y 564 default y
565 ---help--- 565 ---help---
566 sys_sysctl uses binary paths that have been found challenging 566 sys_sysctl uses binary paths that have been found challenging
567 to properly maintain and use. This enables checks that help 567 to properly maintain and use. This enables checks that help
568 you to keep things correct. 568 you to keep things correct.
569 569
570 If unsure say Y here. 570 If unsure say Y here.
571 571
572 config KALLSYMS 572 config KALLSYMS
573 bool "Load all symbols for debugging/ksymoops" if EMBEDDED 573 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
574 default y 574 default y
575 help 575 help
576 Say Y here to let the kernel print out symbolic crash information and 576 Say Y here to let the kernel print out symbolic crash information and
577 symbolic stack backtraces. This increases the size of the kernel 577 symbolic stack backtraces. This increases the size of the kernel
578 somewhat, as all symbols have to be loaded into the kernel image. 578 somewhat, as all symbols have to be loaded into the kernel image.
579 579
580 config KALLSYMS_ALL 580 config KALLSYMS_ALL
581 bool "Include all symbols in kallsyms" 581 bool "Include all symbols in kallsyms"
582 depends on DEBUG_KERNEL && KALLSYMS 582 depends on DEBUG_KERNEL && KALLSYMS
583 help 583 help
584 Normally kallsyms only contains the symbols of functions, for nicer 584 Normally kallsyms only contains the symbols of functions, for nicer
585 OOPS messages. Some debuggers can use kallsyms for other 585 OOPS messages. Some debuggers can use kallsyms for other
586 symbols too: say Y here to include all symbols, if you need them 586 symbols too: say Y here to include all symbols, if you need them
587 and you don't care about adding 300k to the size of your kernel. 587 and you don't care about adding 300k to the size of your kernel.
588 588
589 Say N. 589 Say N.
590 590
591 config KALLSYMS_EXTRA_PASS 591 config KALLSYMS_EXTRA_PASS
592 bool "Do an extra kallsyms pass" 592 bool "Do an extra kallsyms pass"
593 depends on KALLSYMS 593 depends on KALLSYMS
594 help 594 help
595 If kallsyms is not working correctly, the build will fail with 595 If kallsyms is not working correctly, the build will fail with
596 inconsistent kallsyms data. If that occurs, log a bug report and 596 inconsistent kallsyms data. If that occurs, log a bug report and
597 turn on KALLSYMS_EXTRA_PASS which should result in a stable build. 597 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
598 Always say N here unless you find a bug in kallsyms, which must be 598 Always say N here unless you find a bug in kallsyms, which must be
599 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while 599 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
600 you wait for kallsyms to be fixed. 600 you wait for kallsyms to be fixed.
601 601
602 602
603 config HOTPLUG 603 config HOTPLUG
604 bool "Support for hot-pluggable devices" if EMBEDDED 604 bool "Support for hot-pluggable devices" if EMBEDDED
605 default y 605 default y
606 help 606 help
607 This option is provided for the case where no hotplug or uevent 607 This option is provided for the case where no hotplug or uevent
608 capabilities is wanted by the kernel. You should only consider 608 capabilities is wanted by the kernel. You should only consider
609 disabling this option for embedded systems that do not use modules, a 609 disabling this option for embedded systems that do not use modules, a
610 dynamic /dev tree, or dynamic device discovery. Just say Y. 610 dynamic /dev tree, or dynamic device discovery. Just say Y.
611 611
612 config PRINTK 612 config PRINTK
613 default y 613 default y
614 bool "Enable support for printk" if EMBEDDED 614 bool "Enable support for printk" if EMBEDDED
615 help 615 help
616 This option enables normal printk support. Removing it 616 This option enables normal printk support. Removing it
617 eliminates most of the message strings from the kernel image 617 eliminates most of the message strings from the kernel image
618 and makes the kernel more or less silent. As this makes it 618 and makes the kernel more or less silent. As this makes it
619 very difficult to diagnose system problems, saying N here is 619 very difficult to diagnose system problems, saying N here is
620 strongly discouraged. 620 strongly discouraged.
621 621
622 config BUG 622 config BUG
623 bool "BUG() support" if EMBEDDED 623 bool "BUG() support" if EMBEDDED
624 default y 624 default y
625 help 625 help
626 Disabling this option eliminates support for BUG and WARN, reducing 626 Disabling this option eliminates support for BUG and WARN, reducing
627 the size of your kernel image and potentially quietly ignoring 627 the size of your kernel image and potentially quietly ignoring
628 numerous fatal conditions. You should only consider disabling this 628 numerous fatal conditions. You should only consider disabling this
629 option for embedded systems with no facilities for reporting errors. 629 option for embedded systems with no facilities for reporting errors.
630 Just say Y. 630 Just say Y.
631 631
632 config ELF_CORE 632 config ELF_CORE
633 default y 633 default y
634 bool "Enable ELF core dumps" if EMBEDDED 634 bool "Enable ELF core dumps" if EMBEDDED
635 help 635 help
636 Enable support for generating core dumps. Disabling saves about 4k. 636 Enable support for generating core dumps. Disabling saves about 4k.
637 637
638 config PCSPKR_PLATFORM 638 config PCSPKR_PLATFORM
639 bool "Enable PC-Speaker support" if EMBEDDED 639 bool "Enable PC-Speaker support" if EMBEDDED
640 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES 640 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
641 default y 641 default y
642 help 642 help
643 This option allows to disable the internal PC-Speaker 643 This option allows to disable the internal PC-Speaker
644 support, saving some memory. 644 support, saving some memory.
645 645
646 config COMPAT_BRK 646 config COMPAT_BRK
647 bool "Disable heap randomization" 647 bool "Disable heap randomization"
648 default y 648 default y
649 help 649 help
650 Randomizing heap placement makes heap exploits harder, but it 650 Randomizing heap placement makes heap exploits harder, but it
651 also breaks ancient binaries (including anything libc5 based). 651 also breaks ancient binaries (including anything libc5 based).
652 This option changes the bootup default to heap randomization 652 This option changes the bootup default to heap randomization
653 disabled, and can be overriden runtime by setting 653 disabled, and can be overriden runtime by setting
654 /proc/sys/kernel/randomize_va_space to 2. 654 /proc/sys/kernel/randomize_va_space to 2.
655 655
656 On non-ancient distros (post-2000 ones) N is usually a safe choice. 656 On non-ancient distros (post-2000 ones) N is usually a safe choice.
657 657
658 config BASE_FULL 658 config BASE_FULL
659 default y 659 default y
660 bool "Enable full-sized data structures for core" if EMBEDDED 660 bool "Enable full-sized data structures for core" if EMBEDDED
661 help 661 help
662 Disabling this option reduces the size of miscellaneous core 662 Disabling this option reduces the size of miscellaneous core
663 kernel data structures. This saves memory on small machines, 663 kernel data structures. This saves memory on small machines,
664 but may reduce performance. 664 but may reduce performance.
665 665
666 config FUTEX 666 config FUTEX
667 bool "Enable futex support" if EMBEDDED 667 bool "Enable futex support" if EMBEDDED
668 default y 668 default y
669 select RT_MUTEXES 669 select RT_MUTEXES
670 help 670 help
671 Disabling this option will cause the kernel to be built without 671 Disabling this option will cause the kernel to be built without
672 support for "fast userspace mutexes". The resulting kernel may not 672 support for "fast userspace mutexes". The resulting kernel may not
673 run glibc-based applications correctly. 673 run glibc-based applications correctly.
674 674
675 config ANON_INODES 675 config ANON_INODES
676 bool 676 bool
677 677
678 config EPOLL 678 config EPOLL
679 bool "Enable eventpoll support" if EMBEDDED 679 bool "Enable eventpoll support" if EMBEDDED
680 default y 680 default y
681 select ANON_INODES 681 select ANON_INODES
682 help 682 help
683 Disabling this option will cause the kernel to be built without 683 Disabling this option will cause the kernel to be built without
684 support for epoll family of system calls. 684 support for epoll family of system calls.
685 685
686 config SIGNALFD 686 config SIGNALFD
687 bool "Enable signalfd() system call" if EMBEDDED 687 bool "Enable signalfd() system call" if EMBEDDED
688 select ANON_INODES 688 select ANON_INODES
689 default y 689 default y
690 help 690 help
691 Enable the signalfd() system call that allows to receive signals 691 Enable the signalfd() system call that allows to receive signals
692 on a file descriptor. 692 on a file descriptor.
693 693
694 If unsure, say Y. 694 If unsure, say Y.
695 695
696 config TIMERFD 696 config TIMERFD
697 bool "Enable timerfd() system call" if EMBEDDED 697 bool "Enable timerfd() system call" if EMBEDDED
698 select ANON_INODES 698 select ANON_INODES
699 default y 699 default y
700 help 700 help
701 Enable the timerfd() system call that allows to receive timer 701 Enable the timerfd() system call that allows to receive timer
702 events on a file descriptor. 702 events on a file descriptor.
703 703
704 If unsure, say Y. 704 If unsure, say Y.
705 705
706 config EVENTFD 706 config EVENTFD
707 bool "Enable eventfd() system call" if EMBEDDED 707 bool "Enable eventfd() system call" if EMBEDDED
708 select ANON_INODES 708 select ANON_INODES
709 default y 709 default y
710 help 710 help
711 Enable the eventfd() system call that allows to receive both 711 Enable the eventfd() system call that allows to receive both
712 kernel notification (ie. KAIO) or userspace notifications. 712 kernel notification (ie. KAIO) or userspace notifications.
713 713
714 If unsure, say Y. 714 If unsure, say Y.
715 715
716 config SHMEM 716 config SHMEM
717 bool "Use full shmem filesystem" if EMBEDDED 717 bool "Use full shmem filesystem" if EMBEDDED
718 default y 718 default y
719 depends on MMU 719 depends on MMU
720 help 720 help
721 The shmem is an internal filesystem used to manage shared memory. 721 The shmem is an internal filesystem used to manage shared memory.
722 It is backed by swap and manages resource limits. It is also exported 722 It is backed by swap and manages resource limits. It is also exported
723 to userspace as tmpfs if TMPFS is enabled. Disabling this 723 to userspace as tmpfs if TMPFS is enabled. Disabling this
724 option replaces shmem and tmpfs with the much simpler ramfs code, 724 option replaces shmem and tmpfs with the much simpler ramfs code,
725 which may be appropriate on small systems without swap. 725 which may be appropriate on small systems without swap.
726 726
727 config VM_EVENT_COUNTERS 727 config VM_EVENT_COUNTERS
728 default y 728 default y
729 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED 729 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
730 help 730 help
731 VM event counters are needed for event counts to be shown. 731 VM event counters are needed for event counts to be shown.
732 This option allows the disabling of the VM event counters 732 This option allows the disabling of the VM event counters
733 on EMBEDDED systems. /proc/vmstat will only show page counts 733 on EMBEDDED systems. /proc/vmstat will only show page counts
734 if VM event counters are disabled. 734 if VM event counters are disabled.
735 735
736 config SLUB_DEBUG 736 config SLUB_DEBUG
737 default y 737 default y
738 bool "Enable SLUB debugging support" if EMBEDDED 738 bool "Enable SLUB debugging support" if EMBEDDED
739 depends on SLUB && SYSFS 739 depends on SLUB && SYSFS
740 help 740 help
741 SLUB has extensive debug support features. Disabling these can 741 SLUB has extensive debug support features. Disabling these can
742 result in significant savings in code size. This also disables 742 result in significant savings in code size. This also disables
743 SLUB sysfs support. /sys/slab will not exist and there will be 743 SLUB sysfs support. /sys/slab will not exist and there will be
744 no support for cache validation etc. 744 no support for cache validation etc.
745 745
746 choice 746 choice
747 prompt "Choose SLAB allocator" 747 prompt "Choose SLAB allocator"
748 default SLUB 748 default SLUB
749 help 749 help
750 This option allows to select a slab allocator. 750 This option allows to select a slab allocator.
751 751
752 config SLAB 752 config SLAB
753 bool "SLAB" 753 bool "SLAB"
754 help 754 help
755 The regular slab allocator that is established and known to work 755 The regular slab allocator that is established and known to work
756 well in all environments. It organizes cache hot objects in 756 well in all environments. It organizes cache hot objects in
757 per cpu and per node queues. SLAB is the default choice for 757 per cpu and per node queues. SLAB is the default choice for
758 a slab allocator. 758 a slab allocator.
759 759
760 config SLUB 760 config SLUB
761 bool "SLUB (Unqueued Allocator)" 761 bool "SLUB (Unqueued Allocator)"
762 help 762 help
763 SLUB is a slab allocator that minimizes cache line usage 763 SLUB is a slab allocator that minimizes cache line usage
764 instead of managing queues of cached objects (SLAB approach). 764 instead of managing queues of cached objects (SLAB approach).
765 Per cpu caching is realized using slabs of objects instead 765 Per cpu caching is realized using slabs of objects instead
766 of queues of objects. SLUB can use memory efficiently 766 of queues of objects. SLUB can use memory efficiently
767 and has enhanced diagnostics. 767 and has enhanced diagnostics.
768 768
769 config SLOB 769 config SLOB
770 depends on EMBEDDED 770 depends on EMBEDDED
771 bool "SLOB (Simple Allocator)" 771 bool "SLOB (Simple Allocator)"
772 help 772 help
773 SLOB replaces the stock allocator with a drastically simpler 773 SLOB replaces the stock allocator with a drastically simpler
774 allocator. SLOB is generally more space efficient but 774 allocator. SLOB is generally more space efficient but
775 does not perform as well on large systems. 775 does not perform as well on large systems.
776 776
777 endchoice 777 endchoice
778 778
779 config PROFILING 779 config PROFILING
780 bool "Profiling support (EXPERIMENTAL)" 780 bool "Profiling support (EXPERIMENTAL)"
781 help 781 help
782 Say Y here to enable the extended profiling support mechanisms used 782 Say Y here to enable the extended profiling support mechanisms used
783 by profilers such as OProfile. 783 by profilers such as OProfile.
784 784
785 config MARKERS 785 config MARKERS
786 bool "Activate markers" 786 bool "Activate markers"
787 help 787 help
788 Place an empty function call at each marker site. Can be 788 Place an empty function call at each marker site. Can be
789 dynamically changed for a probe function. 789 dynamically changed for a probe function.
790 790
791 source "arch/Kconfig" 791 source "arch/Kconfig"
792 792
793 config PROC_PAGE_MONITOR 793 config PROC_PAGE_MONITOR
794 default y 794 default y
795 depends on PROC_FS && MMU 795 depends on PROC_FS && MMU
796 bool "Enable /proc page monitoring" if EMBEDDED 796 bool "Enable /proc page monitoring" if EMBEDDED
797 help 797 help
798 Various /proc files exist to monitor process memory utilization: 798 Various /proc files exist to monitor process memory utilization:
799 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, 799 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
800 /proc/kpagecount, and /proc/kpageflags. Disabling these 800 /proc/kpagecount, and /proc/kpageflags. Disabling these
801 interfaces will reduce the size of the kernel by approximately 4kb. 801 interfaces will reduce the size of the kernel by approximately 4kb.
802 802
803 endmenu # General setup 803 endmenu # General setup
804 804
805 config HAVE_GENERIC_DMA_COHERENT
806 bool
807 default n
808
805 config SLABINFO 809 config SLABINFO
806 bool 810 bool
807 depends on PROC_FS 811 depends on PROC_FS
808 depends on SLAB || SLUB_DEBUG 812 depends on SLAB || SLUB_DEBUG
809 default y 813 default y
810 814
811 config RT_MUTEXES 815 config RT_MUTEXES
812 boolean 816 boolean
813 select PLIST 817 select PLIST
814 818
815 config TINY_SHMEM 819 config TINY_SHMEM
816 default !SHMEM 820 default !SHMEM
817 bool 821 bool
818 822
819 config BASE_SMALL 823 config BASE_SMALL
820 int 824 int
821 default 0 if BASE_FULL 825 default 0 if BASE_FULL
822 default 1 if !BASE_FULL 826 default 1 if !BASE_FULL
823 827
824 menuconfig MODULES 828 menuconfig MODULES
825 bool "Enable loadable module support" 829 bool "Enable loadable module support"
826 help 830 help
827 Kernel modules are small pieces of compiled code which can 831 Kernel modules are small pieces of compiled code which can
828 be inserted in the running kernel, rather than being 832 be inserted in the running kernel, rather than being
829 permanently built into the kernel. You use the "modprobe" 833 permanently built into the kernel. You use the "modprobe"
830 tool to add (and sometimes remove) them. If you say Y here, 834 tool to add (and sometimes remove) them. If you say Y here,
831 many parts of the kernel can be built as modules (by 835 many parts of the kernel can be built as modules (by
832 answering M instead of Y where indicated): this is most 836 answering M instead of Y where indicated): this is most
833 useful for infrequently used options which are not required 837 useful for infrequently used options which are not required
834 for booting. For more information, see the man pages for 838 for booting. For more information, see the man pages for
835 modprobe, lsmod, modinfo, insmod and rmmod. 839 modprobe, lsmod, modinfo, insmod and rmmod.
836 840
837 If you say Y here, you will need to run "make 841 If you say Y here, you will need to run "make
838 modules_install" to put the modules under /lib/modules/ 842 modules_install" to put the modules under /lib/modules/
839 where modprobe can find them (you may need to be root to do 843 where modprobe can find them (you may need to be root to do
840 this). 844 this).
841 845
842 If unsure, say Y. 846 If unsure, say Y.
843 847
844 config MODULE_FORCE_LOAD 848 config MODULE_FORCE_LOAD
845 bool "Forced module loading" 849 bool "Forced module loading"
846 depends on MODULES 850 depends on MODULES
847 default n 851 default n
848 help 852 help
849 Allow loading of modules without version information (ie. modprobe 853 Allow loading of modules without version information (ie. modprobe
850 --force). Forced module loading sets the 'F' (forced) taint flag and 854 --force). Forced module loading sets the 'F' (forced) taint flag and
851 is usually a really bad idea. 855 is usually a really bad idea.
852 856
853 config MODULE_UNLOAD 857 config MODULE_UNLOAD
854 bool "Module unloading" 858 bool "Module unloading"
855 depends on MODULES 859 depends on MODULES
856 help 860 help
857 Without this option you will not be able to unload any 861 Without this option you will not be able to unload any
858 modules (note that some modules may not be unloadable 862 modules (note that some modules may not be unloadable
859 anyway), which makes your kernel slightly smaller and 863 anyway), which makes your kernel slightly smaller and
860 simpler. If unsure, say Y. 864 simpler. If unsure, say Y.
861 865
862 config MODULE_FORCE_UNLOAD 866 config MODULE_FORCE_UNLOAD
863 bool "Forced module unloading" 867 bool "Forced module unloading"
864 depends on MODULE_UNLOAD && EXPERIMENTAL 868 depends on MODULE_UNLOAD && EXPERIMENTAL
865 help 869 help
866 This option allows you to force a module to unload, even if the 870 This option allows you to force a module to unload, even if the
867 kernel believes it is unsafe: the kernel will remove the module 871 kernel believes it is unsafe: the kernel will remove the module
868 without waiting for anyone to stop using it (using the -f option to 872 without waiting for anyone to stop using it (using the -f option to
869 rmmod). This is mainly for kernel developers and desperate users. 873 rmmod). This is mainly for kernel developers and desperate users.
870 If unsure, say N. 874 If unsure, say N.
871 875
872 config MODVERSIONS 876 config MODVERSIONS
873 bool "Module versioning support" 877 bool "Module versioning support"
874 depends on MODULES 878 depends on MODULES
875 help 879 help
876 Usually, you have to use modules compiled with your kernel. 880 Usually, you have to use modules compiled with your kernel.
877 Saying Y here makes it sometimes possible to use modules 881 Saying Y here makes it sometimes possible to use modules
878 compiled for different kernels, by adding enough information 882 compiled for different kernels, by adding enough information
879 to the modules to (hopefully) spot any changes which would 883 to the modules to (hopefully) spot any changes which would
880 make them incompatible with the kernel you are running. If 884 make them incompatible with the kernel you are running. If
881 unsure, say N. 885 unsure, say N.
882 886
883 config MODULE_SRCVERSION_ALL 887 config MODULE_SRCVERSION_ALL
884 bool "Source checksum for all modules" 888 bool "Source checksum for all modules"
885 depends on MODULES 889 depends on MODULES
886 help 890 help
887 Modules which contain a MODULE_VERSION get an extra "srcversion" 891 Modules which contain a MODULE_VERSION get an extra "srcversion"
888 field inserted into their modinfo section, which contains a 892 field inserted into their modinfo section, which contains a
889 sum of the source files which made it. This helps maintainers 893 sum of the source files which made it. This helps maintainers
890 see exactly which source was used to build a module (since 894 see exactly which source was used to build a module (since
891 others sometimes change the module source without updating 895 others sometimes change the module source without updating
892 the version). With this option, such a "srcversion" field 896 the version). With this option, such a "srcversion" field
893 will be created for all modules. If unsure, say N. 897 will be created for all modules. If unsure, say N.
894 898
895 config KMOD 899 config KMOD
896 bool "Automatic kernel module loading" 900 bool "Automatic kernel module loading"
897 depends on MODULES 901 depends on MODULES
898 help 902 help
899 Normally when you have selected some parts of the kernel to 903 Normally when you have selected some parts of the kernel to
900 be created as kernel modules, you must load them (using the 904 be created as kernel modules, you must load them (using the
901 "modprobe" command) before you can use them. If you say Y 905 "modprobe" command) before you can use them. If you say Y
902 here, some parts of the kernel will be able to load modules 906 here, some parts of the kernel will be able to load modules
903 automatically: when a part of the kernel needs a module, it 907 automatically: when a part of the kernel needs a module, it
904 runs modprobe with the appropriate arguments, thereby 908 runs modprobe with the appropriate arguments, thereby
905 loading the module if it is available. If unsure, say Y. 909 loading the module if it is available. If unsure, say Y.
906 910
907 config STOP_MACHINE 911 config STOP_MACHINE
908 bool 912 bool
909 default y 913 default y
910 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU 914 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
911 help 915 help
912 Need stop_machine() primitive. 916 Need stop_machine() primitive.
913 917
914 source "block/Kconfig" 918 source "block/Kconfig"
915 919
916 config PREEMPT_NOTIFIERS 920 config PREEMPT_NOTIFIERS
917 bool 921 bool
918 922
919 config CLASSIC_RCU 923 config CLASSIC_RCU
920 def_bool !PREEMPT_RCU 924 def_bool !PREEMPT_RCU
921 help 925 help
922 This option selects the classic RCU implementation that is 926 This option selects the classic RCU implementation that is
923 designed for best read-side performance on non-realtime 927 designed for best read-side performance on non-realtime
924 systems. Classic RCU is the default. Note that the 928 systems. Classic RCU is the default. Note that the
925 PREEMPT_RCU symbol is used to select/deselect this option. 929 PREEMPT_RCU symbol is used to select/deselect this option.
926 930
1 # 1 #
2 # Makefile for the linux kernel. 2 # Makefile for the linux kernel.
3 # 3 #
4 4
5 obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \ 5 obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
6 exit.o itimer.o time.o softirq.o resource.o \ 6 exit.o itimer.o time.o softirq.o resource.o \
7 sysctl.o capability.o ptrace.o timer.o user.o \ 7 sysctl.o capability.o ptrace.o timer.o user.o \
8 signal.o sys.o kmod.o workqueue.o pid.o \ 8 signal.o sys.o kmod.o workqueue.o pid.o \
9 rcupdate.o extable.o params.o posix-timers.o \ 9 rcupdate.o extable.o params.o posix-timers.o \
10 kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \ 10 kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ 11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o 12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o
13 13
14 obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o 14 obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
15 obj-$(CONFIG_STACKTRACE) += stacktrace.o 15 obj-$(CONFIG_STACKTRACE) += stacktrace.o
16 obj-y += time/ 16 obj-y += time/
17 obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o 17 obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
18 obj-$(CONFIG_LOCKDEP) += lockdep.o 18 obj-$(CONFIG_LOCKDEP) += lockdep.o
19 ifeq ($(CONFIG_PROC_FS),y) 19 ifeq ($(CONFIG_PROC_FS),y)
20 obj-$(CONFIG_LOCKDEP) += lockdep_proc.o 20 obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
21 endif 21 endif
22 obj-$(CONFIG_FUTEX) += futex.o 22 obj-$(CONFIG_FUTEX) += futex.o
23 ifeq ($(CONFIG_COMPAT),y) 23 ifeq ($(CONFIG_COMPAT),y)
24 obj-$(CONFIG_FUTEX) += futex_compat.o 24 obj-$(CONFIG_FUTEX) += futex_compat.o
25 endif 25 endif
26 obj-$(CONFIG_RT_MUTEXES) += rtmutex.o 26 obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
27 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o 27 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
28 obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o 28 obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
29 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o 29 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
30 obj-$(CONFIG_SMP) += cpu.o spinlock.o 30 obj-$(CONFIG_SMP) += cpu.o spinlock.o
31 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o 31 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
32 obj-$(CONFIG_PROVE_LOCKING) += spinlock.o 32 obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
33 obj-$(CONFIG_UID16) += uid16.o 33 obj-$(CONFIG_UID16) += uid16.o
34 obj-$(CONFIG_MODULES) += module.o 34 obj-$(CONFIG_MODULES) += module.o
35 obj-$(CONFIG_KALLSYMS) += kallsyms.o 35 obj-$(CONFIG_KALLSYMS) += kallsyms.o
36 obj-$(CONFIG_PM) += power/ 36 obj-$(CONFIG_PM) += power/
37 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o 37 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
38 obj-$(CONFIG_KEXEC) += kexec.o 38 obj-$(CONFIG_KEXEC) += kexec.o
39 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o 39 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
40 obj-$(CONFIG_COMPAT) += compat.o 40 obj-$(CONFIG_COMPAT) += compat.o
41 obj-$(CONFIG_CGROUPS) += cgroup.o 41 obj-$(CONFIG_CGROUPS) += cgroup.o
42 obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o 42 obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
43 obj-$(CONFIG_CPUSETS) += cpuset.o 43 obj-$(CONFIG_CPUSETS) += cpuset.o
44 obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o 44 obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
45 obj-$(CONFIG_UTS_NS) += utsname.o 45 obj-$(CONFIG_UTS_NS) += utsname.o
46 obj-$(CONFIG_USER_NS) += user_namespace.o 46 obj-$(CONFIG_USER_NS) += user_namespace.o
47 obj-$(CONFIG_PID_NS) += pid_namespace.o 47 obj-$(CONFIG_PID_NS) += pid_namespace.o
48 obj-$(CONFIG_IKCONFIG) += configs.o 48 obj-$(CONFIG_IKCONFIG) += configs.o
49 obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o 49 obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
50 obj-$(CONFIG_STOP_MACHINE) += stop_machine.o 50 obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
51 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o 51 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
52 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o 52 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
53 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o 53 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
54 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o 54 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
55 obj-$(CONFIG_KPROBES) += kprobes.o 55 obj-$(CONFIG_KPROBES) += kprobes.o
56 obj-$(CONFIG_KGDB) += kgdb.o 56 obj-$(CONFIG_KGDB) += kgdb.o
57 obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o 57 obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
58 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/ 58 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
59 obj-$(CONFIG_SECCOMP) += seccomp.o 59 obj-$(CONFIG_SECCOMP) += seccomp.o
60 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o 60 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
61 obj-$(CONFIG_CLASSIC_RCU) += rcuclassic.o 61 obj-$(CONFIG_CLASSIC_RCU) += rcuclassic.o
62 obj-$(CONFIG_PREEMPT_RCU) += rcupreempt.o 62 obj-$(CONFIG_PREEMPT_RCU) += rcupreempt.o
63 ifeq ($(CONFIG_PREEMPT_RCU),y) 63 ifeq ($(CONFIG_PREEMPT_RCU),y)
64 obj-$(CONFIG_RCU_TRACE) += rcupreempt_trace.o 64 obj-$(CONFIG_RCU_TRACE) += rcupreempt_trace.o
65 endif 65 endif
66 obj-$(CONFIG_RELAY) += relay.o 66 obj-$(CONFIG_RELAY) += relay.o
67 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o 67 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
68 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o 68 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
69 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o 69 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
70 obj-$(CONFIG_MARKERS) += marker.o 70 obj-$(CONFIG_MARKERS) += marker.o
71 obj-$(CONFIG_LATENCYTOP) += latencytop.o 71 obj-$(CONFIG_LATENCYTOP) += latencytop.o
72 obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
72 73
73 ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y) 74 ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
74 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is 75 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
75 # needed for x86 only. Why this used to be enabled for all architectures is beyond 76 # needed for x86 only. Why this used to be enabled for all architectures is beyond
76 # me. I suspect most platforms don't need this, but until we know that for sure 77 # me. I suspect most platforms don't need this, but until we know that for sure
77 # I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k 78 # I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k
78 # to get a correct value for the wait-channel (WCHAN in ps). --davidm 79 # to get a correct value for the wait-channel (WCHAN in ps). --davidm
79 CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer 80 CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer
80 endif 81 endif
81 82
82 $(obj)/configs.o: $(obj)/config_data.h 83 $(obj)/configs.o: $(obj)/config_data.h
83 84
84 # config_data.h contains the same information as ikconfig.h but gzipped. 85 # config_data.h contains the same information as ikconfig.h but gzipped.
85 # Info from config_data can be extracted from /proc/config* 86 # Info from config_data can be extracted from /proc/config*
86 targets += config_data.gz 87 targets += config_data.gz
87 $(obj)/config_data.gz: .config FORCE 88 $(obj)/config_data.gz: .config FORCE
88 $(call if_changed,gzip) 89 $(call if_changed,gzip)
89 90
90 quiet_cmd_ikconfiggz = IKCFG $@ 91 quiet_cmd_ikconfiggz = IKCFG $@
91 cmd_ikconfiggz = (echo "static const char kernel_config_data[] = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@ 92 cmd_ikconfiggz = (echo "static const char kernel_config_data[] = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@
92 targets += config_data.h 93 targets += config_data.h
93 $(obj)/config_data.h: $(obj)/config_data.gz FORCE 94 $(obj)/config_data.h: $(obj)/config_data.gz FORCE
94 $(call if_changed,ikconfiggz) 95 $(call if_changed,ikconfiggz)
95 96
96 $(obj)/time.o: $(obj)/timeconst.h 97 $(obj)/time.o: $(obj)/timeconst.h
97 98
98 quiet_cmd_timeconst = TIMEC $@ 99 quiet_cmd_timeconst = TIMEC $@
99 cmd_timeconst = $(PERL) $< $(CONFIG_HZ) > $@ 100 cmd_timeconst = $(PERL) $< $(CONFIG_HZ) > $@
100 targets += timeconst.h 101 targets += timeconst.h
101 $(obj)/timeconst.h: $(src)/timeconst.pl FORCE 102 $(obj)/timeconst.h: $(src)/timeconst.pl FORCE
102 $(call if_changed,timeconst) 103 $(call if_changed,timeconst)
103 104
kernel/dma-coherent.c
Diff comments   View file @ ee7e551
File was created 1 /*
2 * Coherent per-device memory handling.
3 * Borrowed from i386
4 */
5 #include <linux/kernel.h>
6 #include <linux/dma-mapping.h>
7
8 struct dma_coherent_mem {
9 void *virt_base;
10 u32 device_base;
11 int size;
12 int flags;
13 unsigned long *bitmap;
14 };
15
16 int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
17 dma_addr_t device_addr, size_t size, int flags)
18 {
19 void __iomem *mem_base = NULL;
20 int pages = size >> PAGE_SHIFT;
21 int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
22
23 if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
24 goto out;
25 if (!size)
26 goto out;
27 if (dev->dma_mem)
28 goto out;
29
30 /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
31
32 mem_base = ioremap(bus_addr, size);
33 if (!mem_base)
34 goto out;
35
36 dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
37 if (!dev->dma_mem)
38 goto out;
39 dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
40 if (!dev->dma_mem->bitmap)
41 goto free1_out;
42
43 dev->dma_mem->virt_base = mem_base;
44 dev->dma_mem->device_base = device_addr;
45 dev->dma_mem->size = pages;
46 dev->dma_mem->flags = flags;
47
48 if (flags & DMA_MEMORY_MAP)
49 return DMA_MEMORY_MAP;
50
51 return DMA_MEMORY_IO;
52
53 free1_out:
54 kfree(dev->dma_mem);
55 out:
56 if (mem_base)
57 iounmap(mem_base);
58 return 0;
59 }
60 EXPORT_SYMBOL(dma_declare_coherent_memory);
61
62 void dma_release_declared_memory(struct device *dev)
63 {
64 struct dma_coherent_mem *mem = dev->dma_mem;
65
66 if (!mem)
67 return;
68 dev->dma_mem = NULL;
69 iounmap(mem->virt_base);
70 kfree(mem->bitmap);
71 kfree(mem);
72 }
73 EXPORT_SYMBOL(dma_release_declared_memory);
74
75 void *dma_mark_declared_memory_occupied(struct device *dev,
76 dma_addr_t device_addr, size_t size)
77 {
78 struct dma_coherent_mem *mem = dev->dma_mem;
79 int pos, err;
80 int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1);
81
82 pages >>= PAGE_SHIFT;
83
84 if (!mem)
85 return ERR_PTR(-EINVAL);
86
87 pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
88 err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));
89 if (err != 0)
90 return ERR_PTR(err);
91 return mem->virt_base + (pos << PAGE_SHIFT);
92 }
93 EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
94
95 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
96 dma_addr_t *dma_handle, void **ret)
97 {
98 struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
99 int order = get_order(size);
100
101 if (mem) {
102 int page = bitmap_find_free_region(mem->bitmap, mem->size,
103 order);
104 if (page >= 0) {
105 *dma_handle = mem->device_base + (page << PAGE_SHIFT);
106 *ret = mem->virt_base + (page << PAGE_SHIFT);
107 memset(*ret, 0, size);
108 }
109 if (mem->flags & DMA_MEMORY_EXCLUSIVE)
110 *ret = NULL;
111 }
112 return (mem != NULL);
113 }
114
115 int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
116 {
117 struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
118
119 if (mem && vaddr >= mem->virt_base && vaddr <
120 (mem->virt_base + (mem->size << PAGE_SHIFT))) {
121 int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
122
123 bitmap_release_region(mem->bitmap, page, order);
124 return 1;
125 }
126 return 0;
127 }
128