sysctl.c 67.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/*
 * sysctl.c: General linux system control interface
 *
 * Begun 24 March 1995, Stephen Tweedie
 * Added /proc support, Dec 1995
 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
 * Dynamic registration fixes, Stephen Tweedie.
 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
 *  Horn.
 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
 *  Wendling.
 * The list_for_each() macro wasn't appropriate for the sysctl loop.
 *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
27
#include <linux/security.h>
Linus Torvalds's avatar
Linus Torvalds committed
28 29 30
#include <linux/ctype.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
31
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
32 33
#include <linux/init.h>
#include <linux/kernel.h>
34
#include <linux/kobject.h>
35
#include <linux/net.h>
Linus Torvalds's avatar
Linus Torvalds committed
36 37 38 39 40
#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
#include <linux/hugetlb.h>
#include <linux/initrd.h>
41
#include <linux/key.h>
Linus Torvalds's avatar
Linus Torvalds committed
42 43 44 45
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
#include <linux/syscalls.h>
46 47
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
48
#include <linux/reboot.h>
49
#include <linux/ftrace.h>
Linus Torvalds's avatar
Linus Torvalds committed
50 51 52 53

#include <asm/uaccess.h>
#include <asm/processor.h>

54 55
#ifdef CONFIG_X86
#include <asm/nmi.h>
56
#include <asm/stacktrace.h>
57
#include <asm/io.h>
58 59
#endif

60 61
static int deprecated_sysctl_warning(struct __sysctl_args *args);

Linus Torvalds's avatar
Linus Torvalds committed
62 63 64 65
#if defined(CONFIG_SYSCTL)

/* External variables not in a header file. */
extern int C_A_D;
Ingo Molnar's avatar
Ingo Molnar committed
66
extern int print_fatal_signals;
Linus Torvalds's avatar
Linus Torvalds committed
67 68
extern int sysctl_overcommit_memory;
extern int sysctl_overcommit_ratio;
69
extern int sysctl_panic_on_oom;
70
extern int sysctl_oom_kill_allocating_task;
71
extern int sysctl_oom_dump_tasks;
Linus Torvalds's avatar
Linus Torvalds committed
72 73
extern int max_threads;
extern int core_uses_pid;
Alan Cox's avatar
Alan Cox committed
74
extern int suid_dumpable;
Linus Torvalds's avatar
Linus Torvalds committed
75 76 77 78
extern char core_pattern[];
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
79
extern int sysctl_drop_caches;
80
extern int percpu_pagelist_fraction;
81
extern int compat_log;
Kees Cook's avatar
Kees Cook committed
82
extern int maps_protect;
83
extern int sysctl_stat_interval;
Arjan van de Ven's avatar
Arjan van de Ven committed
84
extern int latencytop_enabled;
85
extern int sysctl_nr_open_min, sysctl_nr_open_max;
Linus Torvalds's avatar
Linus Torvalds committed
86

87
/* Constants used for minimum and  maximum */
88
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
89
static int one = 1;
90 91 92
#endif

#ifdef CONFIG_DETECT_SOFTLOCKUP
93
static int sixty = 60;
94
static int neg_one = -1;
95 96 97 98 99 100 101 102 103
#endif

#ifdef CONFIG_MMU
static int two = 2;
#endif

static int zero;
static int one_hundred = 100;

Linus Torvalds's avatar
Linus Torvalds committed
104 105 106
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
107
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128

static int ngroups_max = NGROUPS_MAX;

#ifdef CONFIG_KMOD
extern char modprobe_path[];
#endif
#ifdef CONFIG_CHR_DEV_SG
extern int sg_big_buff;
#endif

#ifdef __sparc__
extern char reboot_command [];
extern int stop_a_enabled;
extern int scons_pwroff;
#endif

#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

129
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
130 131 132 133
#ifdef CONFIG_MATHEMU
extern int sysctl_ieee_emulation_warnings;
#endif
extern int sysctl_userprocess_debug;
134
extern int spin_retry;
Linus Torvalds's avatar
Linus Torvalds committed
135 136 137 138 139 140
#endif

#ifdef CONFIG_BSD_PROCESS_ACCT
extern int acct_parm[];
#endif

141 142 143 144
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
#endif

Ingo Molnar's avatar
Ingo Molnar committed
145 146 147 148
#ifdef CONFIG_RT_MUTEXES
extern int max_lock_depth;
#endif

149
#ifdef CONFIG_PROC_SYSCTL
150
static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
151
		  void __user *buffer, size_t *lenp, loff_t *ppos);
152
static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
153
			       void __user *buffer, size_t *lenp, loff_t *ppos);
154
#endif
155

156
static struct ctl_table root_table[];
157 158 159 160 161 162 163 164 165 166
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
	.ctl_table = root_table,
	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
	.root = &sysctl_table_root,
};
static struct ctl_table_root sysctl_table_root = {
	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
	.header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
};
Linus Torvalds's avatar
Linus Torvalds committed
167

168 169 170 171 172 173
static struct ctl_table kern_table[];
static struct ctl_table vm_table[];
static struct ctl_table fs_table[];
static struct ctl_table debug_table[];
static struct ctl_table dev_table[];
extern struct ctl_table random_table[];
174
#ifdef CONFIG_INOTIFY_USER
175
extern struct ctl_table inotify_table[];
Robert Love's avatar
Robert Love committed
176
#endif
Linus Torvalds's avatar
Linus Torvalds committed
177 178 179 180 181

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

Peter Zijlstra's avatar
Peter Zijlstra committed
182 183
extern int prove_locking;
extern int lock_stat;
184

Linus Torvalds's avatar
Linus Torvalds committed
185 186
/* The default sysctl tables: */

187
static struct ctl_table root_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
	{
		.ctl_name	= CTL_KERN,
		.procname	= "kernel",
		.mode		= 0555,
		.child		= kern_table,
	},
	{
		.ctl_name	= CTL_VM,
		.procname	= "vm",
		.mode		= 0555,
		.child		= vm_table,
	},
	{
		.ctl_name	= CTL_FS,
		.procname	= "fs",
		.mode		= 0555,
		.child		= fs_table,
	},
	{
		.ctl_name	= CTL_DEBUG,
		.procname	= "debug",
		.mode		= 0555,
		.child		= debug_table,
	},
	{
		.ctl_name	= CTL_DEV,
		.procname	= "dev",
		.mode		= 0555,
		.child		= dev_table,
	},
218 219 220 221
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
Linus Torvalds's avatar
Linus Torvalds committed
222 223 224
	{ .ctl_name = 0 }
};

Ingo Molnar's avatar
Ingo Molnar committed
225
#ifdef CONFIG_SCHED_DEBUG
226 227 228 229
static int min_sched_granularity_ns = 100000;		/* 100 usecs */
static int max_sched_granularity_ns = NSEC_PER_SEC;	/* 1 second */
static int min_wakeup_granularity_ns;			/* 0 usecs */
static int max_wakeup_granularity_ns = NSEC_PER_SEC;	/* 1 second */
Ingo Molnar's avatar
Ingo Molnar committed
230 231
#endif

232
static struct ctl_table kern_table[] = {
Ingo Molnar's avatar
Ingo Molnar committed
233 234 235
#ifdef CONFIG_SCHED_DEBUG
	{
		.ctl_name	= CTL_UNNUMBERED,
236 237
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
238 239
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
240 241 242 243
		.proc_handler	= &sched_nr_latency_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
244
	},
245 246 247 248 249 250
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
251
		.proc_handler	= &sched_nr_latency_handler,
252 253 254 255
		.strategy	= &sysctl_intvec,
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
256 257 258 259 260 261 262 263 264 265 266
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
267 268 269 270 271 272 273 274
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_shares_ratelimit",
		.data		= &sysctl_sched_shares_ratelimit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Ingo Molnar's avatar
Ingo Molnar committed
275 276 277 278 279 280 281 282
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
283 284 285 286 287 288 289 290
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_features",
		.data		= &sysctl_sched_features,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
291 292 293 294 295 296 297 298
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_migration_cost",
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
299 300 301 302 303
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
304 305 306
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
307
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
308 309 310 311 312 313
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
314
		.proc_handler	= &sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
315 316 317 318 319 320 321
	},
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
322
		.proc_handler	= &sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
323
	},
324 325 326 327 328 329 330 331
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "sched_compat_yield",
		.data		= &sysctl_sched_compat_yield,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Peter Zijlstra's avatar
Peter Zijlstra committed
332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350
#ifdef CONFIG_PROVE_LOCKING
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Ingo Molnar's avatar
Ingo Molnar committed
351
#endif
Linus Torvalds's avatar
Linus Torvalds committed
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371
	{
		.ctl_name	= KERN_PANIC,
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= KERN_CORE_USES_PID,
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= KERN_CORE_PATTERN,
		.procname	= "core_pattern",
		.data		= core_pattern,
372
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
373 374 375 376
		.mode		= 0644,
		.proc_handler	= &proc_dostring,
		.strategy	= &sysctl_string,
	},
377
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
378 379 380 381
	{
		.procname	= "tainted",
		.data		= &tainted,
		.maxlen		= sizeof(int),
382 383
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_taint,
Linus Torvalds's avatar
Linus Torvalds committed
384
	},
385
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
386 387 388 389 390 391 392 393 394
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
395 396 397 398 399 400 401 402 403 404
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.ctl_name	= KERN_REALROOTDEV,
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
405 406 407 408 409 410 411 412
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
#ifdef __sparc__
	{
		.ctl_name	= KERN_SPARC_REBOOT,
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
		.proc_handler	= &proc_dostring,
		.strategy	= &sysctl_string,
	},
	{
		.ctl_name	= KERN_SPARC_STOP_A,
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= KERN_SPARC_SCONS_PWROFF,
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
#ifdef __hppa__
	{
		.ctl_name	= KERN_HPPA_PWRSW,
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= KERN_HPPA_UNALIGNED,
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
	{
		.ctl_name	= KERN_CTLALTDEL,
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
466 467 468 469 470 471 472 473 474 475
#ifdef CONFIG_FTRACE
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &ftrace_enable_sysctl,
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
476 477 478 479 480 481 482 483 484 485 486
#ifdef CONFIG_KMOD
	{
		.ctl_name	= KERN_MODPROBE,
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
		.proc_handler	= &proc_dostring,
		.strategy	= &sysctl_string,
	},
#endif
Andrew Morton's avatar
Andrew Morton committed
487
#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
Linus Torvalds's avatar
Linus Torvalds committed
488 489 490
	{
		.ctl_name	= KERN_HOTPLUG,
		.procname	= "hotplug",
491 492
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521
		.mode		= 0644,
		.proc_handler	= &proc_dostring,
		.strategy	= &sysctl_string,
	},
#endif
#ifdef CONFIG_CHR_DEV_SG
	{
		.ctl_name	= KERN_SG_BIG_BUFF,
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.ctl_name	= KERN_ACCT,
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.ctl_name	= KERN_SYSRQ,
		.procname	= "sysrq",
522
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
523 524 525 526 527
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
528
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
529 530
	{
		.procname	= "cad_pid",
531
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
532 533
		.maxlen		= sizeof (int),
		.mode		= 0600,
534
		.proc_handler	= &proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
535
	},
536
#endif
Linus Torvalds's avatar
Linus Torvalds committed
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
	{
		.ctl_name	= KERN_MAX_THREADS,
		.procname	= "threads-max",
		.data		= &max_threads,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= KERN_RANDOM,
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
	{
		.ctl_name	= KERN_OVERFLOWUID,
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.ctl_name	= KERN_OVERFLOWGID,
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
573
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
#ifdef CONFIG_MATHEMU
	{
		.ctl_name	= KERN_IEEE_EMULATION_WARNINGS,
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
	{
		.ctl_name	= KERN_S390_USER_DEBUG_LOGGING,
		.procname	= "userprocess_debug",
		.data		= &sysctl_userprocess_debug,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
	{
		.ctl_name	= KERN_PIDMAX,
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= sysctl_intvec,
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.ctl_name	= KERN_PANIC_ON_OOPS,
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
612 613 614 615 616 617 618 619 620
#if defined CONFIG_PRINTK
	{
		.ctl_name	= KERN_PRINTK,
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
	{
		.ctl_name	= KERN_PRINTK_RATELIMIT,
		.procname	= "printk_ratelimit",
		.data		= &printk_ratelimit_jiffies,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies,
	},
	{
		.ctl_name	= KERN_PRINTK_RATELIMIT_BURST,
		.procname	= "printk_ratelimit_burst",
		.data		= &printk_ratelimit_burst,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
638
#endif
Linus Torvalds's avatar
Linus Torvalds committed
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
	{
		.ctl_name	= KERN_NGROUPS_MAX,
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
	{
		.ctl_name       = KERN_UNKNOWN_NMI_PANIC,
		.procname       = "unknown_nmi_panic",
		.data           = &unknown_nmi_panic,
		.maxlen         = sizeof (int),
		.mode           = 0644,
654
		.proc_handler   = &proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
655
	},
656 657 658 659 660 661
	{
		.procname       = "nmi_watchdog",
		.data           = &nmi_watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
		.proc_handler   = &proc_nmi_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
662 663 664
	},
#endif
#if defined(CONFIG_X86)
665 666 667 668 669 670 671 672
	{
		.ctl_name	= KERN_PANIC_ON_NMI,
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
673 674 675 676 677 678 679 680
	{
		.ctl_name	= KERN_BOOTLOADER_TYPE,
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
681 682 683 684 685 686 687 688
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
689 690 691 692 693 694 695 696
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
697
#endif
698
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
699 700 701 702 703 704 705 706
	{
		.ctl_name	= KERN_RANDOMIZE,
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
707
#endif
708
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
709 710 711 712 713 714 715 716
	{
		.ctl_name	= KERN_SPIN_RETRY,
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
717
#endif
Len Brown's avatar
Len Brown committed
718
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
719 720
	{
		.procname	= "acpi_video_flags",
721
		.data		= &acpi_realmode_flags,
722 723
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
724
		.proc_handler	= &proc_doulongvec_minmax,
725
	},
726 727 728 729 730 731 732 733 734 735
#endif
#ifdef CONFIG_IA64
	{
		.ctl_name	= KERN_IA64_UNALIGNED,
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
736
#endif
737
#ifdef CONFIG_DETECT_SOFTLOCKUP
738 739 740 741 742 743 744 745 746 747 748
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_doulongvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one,
	},
749 750 751 752
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "softlockup_thresh",
		.data		= &softlockup_thresh,
753
		.maxlen		= sizeof(int),
754
		.mode		= 0644,
755
		.proc_handler	= &proc_dointvec_minmax,
756
		.strategy	= &sysctl_intvec,
757
		.extra1		= &neg_one,
758 759
		.extra2		= &sixty,
	},
760 761 762 763
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
764
		.maxlen		= sizeof(unsigned long),
765
		.mode		= 0644,
Ingo Molnar's avatar
Ingo Molnar committed
766
		.proc_handler	= &proc_doulongvec_minmax,
767 768 769 770 771 772
		.strategy	= &sysctl_intvec,
	},
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
773
		.maxlen		= sizeof(unsigned long),
774
		.mode		= 0644,
Ingo Molnar's avatar
Ingo Molnar committed
775
		.proc_handler	= &proc_doulongvec_minmax,
776 777 778 779 780 781
		.strategy	= &sysctl_intvec,
	},
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
782
		.maxlen		= sizeof(unsigned long),
783
		.mode		= 0644,
Ingo Molnar's avatar
Ingo Molnar committed
784
		.proc_handler	= &proc_doulongvec_minmax,
785 786
		.strategy	= &sysctl_intvec,
	},
787
#endif
788 789 790 791 792 793 794 795 796
#ifdef CONFIG_COMPAT
	{
		.ctl_name	= KERN_COMPAT_LOG,
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
797
#endif
Ingo Molnar's avatar
Ingo Molnar committed
798 799 800 801 802 803 804 805 806 807
#ifdef CONFIG_RT_MUTEXES
	{
		.ctl_name	= KERN_MAX_LOCK_DEPTH,
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
Kees Cook's avatar
Kees Cook committed
808 809 810 811 812 813 814 815 816 817
#ifdef CONFIG_PROC_FS
	{
		.ctl_name       = CTL_UNNUMBERED,
		.procname       = "maps_protect",
		.data           = &maps_protect,
		.maxlen         = sizeof(int),
		.mode           = 0644,
		.proc_handler   = &proc_dointvec,
	},
#endif
818 819 820 821 822 823 824 825 826
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
		.proc_handler	= &proc_dostring,
		.strategy	= &sysctl_string,
	},
827 828 829 830 831 832 833 834
#ifdef CONFIG_KEYS
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
835 836 837 838
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
Linus Torvalds's avatar
Linus Torvalds committed
839 840 841
	{ .ctl_name = 0 }
};

842
static struct ctl_table vm_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
843 844 845 846 847 848 849 850
	{
		.ctl_name	= VM_OVERCOMMIT_MEMORY,
		.procname	= "overcommit_memory",
		.data		= &sysctl_overcommit_memory,
		.maxlen		= sizeof(sysctl_overcommit_memory),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
851 852 853 854 855 856 857 858
	{
		.ctl_name	= VM_PANIC_ON_OOM,
		.procname	= "panic_on_oom",
		.data		= &sysctl_panic_on_oom,
		.maxlen		= sizeof(sysctl_panic_on_oom),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
859 860 861 862 863 864 865 866
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "oom_kill_allocating_task",
		.data		= &sysctl_oom_kill_allocating_task,
		.maxlen		= sizeof(sysctl_oom_kill_allocating_task),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
867 868 869 870 871 872 873 874
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "oom_dump_tasks",
		.data		= &sysctl_oom_dump_tasks,
		.maxlen		= sizeof(sysctl_oom_dump_tasks),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
	{
		.ctl_name	= VM_OVERCOMMIT_RATIO,
		.procname	= "overcommit_ratio",
		.data		= &sysctl_overcommit_ratio,
		.maxlen		= sizeof(sysctl_overcommit_ratio),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= VM_PAGE_CLUSTER,
		.procname	= "page-cluster", 
		.data		= &page_cluster,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= VM_DIRTY_BACKGROUND,
		.procname	= "dirty_background_ratio",
		.data		= &dirty_background_ratio,
		.maxlen		= sizeof(dirty_background_ratio),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one_hundred,
	},
	{
		.ctl_name	= VM_DIRTY_RATIO,
		.procname	= "dirty_ratio",
		.data		= &vm_dirty_ratio,
		.maxlen		= sizeof(vm_dirty_ratio),
		.mode		= 0644,
908
		.proc_handler	= &dirty_ratio_handler,
Linus Torvalds's avatar
Linus Torvalds committed
909 910 911 912 913 914
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one_hundred,
	},
	{
		.procname	= "dirty_writeback_centisecs",
915 916
		.data		= &dirty_writeback_interval,
		.maxlen		= sizeof(dirty_writeback_interval),
Linus Torvalds's avatar
Linus Torvalds committed
917 918 919 920 921
		.mode		= 0644,
		.proc_handler	= &dirty_writeback_centisecs_handler,
	},
	{
		.procname	= "dirty_expire_centisecs",
922 923
		.data		= &dirty_expire_interval,
		.maxlen		= sizeof(dirty_expire_interval),
Linus Torvalds's avatar
Linus Torvalds committed
924
		.mode		= 0644,
925
		.proc_handler	= &proc_dointvec_userhz_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
	},
	{
		.ctl_name	= VM_NR_PDFLUSH_THREADS,
		.procname	= "nr_pdflush_threads",
		.data		= &nr_pdflush_threads,
		.maxlen		= sizeof nr_pdflush_threads,
		.mode		= 0444 /* read-only*/,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= VM_SWAPPINESS,
		.procname	= "swappiness",
		.data		= &vm_swappiness,
		.maxlen		= sizeof(vm_swappiness),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one_hundred,
	},
#ifdef CONFIG_HUGETLB_PAGE
	 {
		.procname	= "nr_hugepages",
		.data		= &max_huge_pages,
		.maxlen		= sizeof(unsigned long),
		.mode		= 0644,
		.proc_handler	= &hugetlb_sysctl_handler,
		.extra1		= (void *)&hugetlb_zero,
		.extra2		= (void *)&hugetlb_infinity,
	 },
	 {
		.ctl_name	= VM_HUGETLB_GROUP,
		.procname	= "hugetlb_shm_group",
		.data		= &sysctl_hugetlb_shm_group,
		.maxlen		= sizeof(gid_t),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	 },
964 965 966 967 968 969 970 971
	 {
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "hugepages_treat_as_movable",
		.data		= &hugepages_treat_as_movable,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &hugetlb_treat_movable_handler,
	},
972 973 974
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "nr_overcommit_hugepages",
975 976
		.data		= &sysctl_overcommit_huge_pages,
		.maxlen		= sizeof(sysctl_overcommit_huge_pages),
977
		.mode		= 0644,
978
		.proc_handler	= &hugetlb_overcommit_handler,
979
	},
Linus Torvalds's avatar
Linus Torvalds committed
980 981 982 983 984 985 986 987 988 989
#endif
	{
		.ctl_name	= VM_LOWMEM_RESERVE_RATIO,
		.procname	= "lowmem_reserve_ratio",
		.data		= &sysctl_lowmem_reserve_ratio,
		.maxlen		= sizeof(sysctl_lowmem_reserve_ratio),
		.mode		= 0644,
		.proc_handler	= &lowmem_reserve_ratio_sysctl_handler,
		.strategy	= &sysctl_intvec,
	},
Andrew Morton's avatar
Andrew Morton committed
990 991 992 993 994 995 996 997 998
	{
		.ctl_name	= VM_DROP_PAGECACHE,
		.procname	= "drop_caches",
		.data		= &sysctl_drop_caches,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= drop_caches_sysctl_handler,
		.strategy	= &sysctl_intvec,
	},
Linus Torvalds's avatar
Linus Torvalds committed
999 1000 1001 1002 1003 1004 1005 1006 1007 1008
	{
		.ctl_name	= VM_MIN_FREE_KBYTES,
		.procname	= "min_free_kbytes",
		.data		= &min_free_kbytes,
		.maxlen		= sizeof(min_free_kbytes),
		.mode		= 0644,
		.proc_handler	= &min_free_kbytes_sysctl_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
	},
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	{
		.ctl_name	= VM_PERCPU_PAGELIST_FRACTION,
		.procname	= "percpu_pagelist_fraction",
		.data		= &percpu_pagelist_fraction,
		.maxlen		= sizeof(percpu_pagelist_fraction),
		.mode		= 0644,
		.proc_handler	= &percpu_pagelist_fraction_sysctl_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &min_percpu_pagelist_fract,
	},
Linus Torvalds's avatar
Linus Torvalds committed
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
#ifdef CONFIG_MMU
	{
		.ctl_name	= VM_MAX_MAP_COUNT,
		.procname	= "max_map_count",
		.data		= &sysctl_max_map_count,
		.maxlen		= sizeof(sysctl_max_map_count),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
#endif
	{
		.ctl_name	= VM_LAPTOP_MODE,
		.procname	= "laptop_mode",
		.data		= &laptop_mode,
		.maxlen		= sizeof(laptop_mode),
		.mode		= 0644,
1035 1036
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
	},
	{
		.ctl_name	= VM_BLOCK_DUMP,
		.procname	= "block_dump",
		.data		= &block_dump,
		.maxlen		= sizeof(block_dump),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
	},
	{
		.ctl_name	= VM_VFS_CACHE_PRESSURE,
		.procname	= "vfs_cache_pressure",
		.data		= &sysctl_vfs_cache_pressure,
		.maxlen		= sizeof(sysctl_vfs_cache_pressure),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
	},
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
	{
		.ctl_name	= VM_LEGACY_VA_LAYOUT,
		.procname	= "legacy_va_layout",
		.data		= &sysctl_legacy_va_layout,
		.maxlen		= sizeof(sysctl_legacy_va_layout),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
	},
#endif
1070 1071 1072 1073 1074 1075 1076 1077
#ifdef CONFIG_NUMA
	{
		.ctl_name	= VM_ZONE_RECLAIM_MODE,
		.procname	= "zone_reclaim_mode",
		.data		= &zone_reclaim_mode,
		.maxlen		= sizeof(zone_reclaim_mode),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
1078 1079
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
1080
	},
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
	{
		.ctl_name	= VM_MIN_UNMAPPED,
		.procname	= "min_unmapped_ratio",
		.data		= &sysctl_min_unmapped_ratio,
		.maxlen		= sizeof(sysctl_min_unmapped_ratio),
		.mode		= 0644,
		.proc_handler	= &sysctl_min_unmapped_ratio_sysctl_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one_hundred,
	},
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
	{
		.ctl_name	= VM_MIN_SLAB,
		.procname	= "min_slab_ratio",
		.data		= &sysctl_min_slab_ratio,
		.maxlen		= sizeof(sysctl_min_slab_ratio),
		.mode		= 0644,
		.proc_handler	= &sysctl_min_slab_ratio_sysctl_handler,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one_hundred,
	},
1103
#endif
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
#ifdef CONFIG_SMP
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "stat_interval",
		.data		= &sysctl_stat_interval,
		.maxlen		= sizeof(sysctl_stat_interval),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies,
	},
#endif
1115 1116 1117 1118 1119 1120 1121 1122 1123
#ifdef CONFIG_SECURITY
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "mmap_min_addr",
		.data		= &mmap_min_addr,
		.maxlen         = sizeof(unsigned long),
		.mode		= 0644,
		.proc_handler	= &proc_doulongvec_minmax,
	},
1124
#endif
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
#ifdef CONFIG_NUMA
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "numa_zonelist_order",
		.data		= &numa_zonelist_order,
		.maxlen		= NUMA_ZONELIST_ORDER_LEN,
		.mode		= 0644,
		.proc_handler	= &numa_zonelist_order_handler,
		.strategy	= &sysctl_string,
	},
#endif
1136
#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1137
   (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	{
		.ctl_name	= VM_VDSO_ENABLED,
		.procname	= "vdso_enabled",
		.data		= &vdso_enabled,
		.maxlen		= sizeof(vdso_enabled),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
	},
Linus Torvalds's avatar
Linus Torvalds committed
1148
#endif
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
#ifdef CONFIG_HIGHMEM
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "highmem_is_dirtyable",
		.data		= &vm_highmem_is_dirtyable,
		.maxlen		= sizeof(vm_highmem_is_dirtyable),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
1162 1163 1164 1165
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
Linus Torvalds's avatar
Linus Torvalds committed
1166 1167 1168
	{ .ctl_name = 0 }
};

1169
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1170
static struct ctl_table binfmt_misc_table[] = {
1171 1172 1173 1174
	{ .ctl_name = 0 }
};
#endif

1175
static struct ctl_table fs_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	{
		.ctl_name	= FS_NRINODE,
		.procname	= "inode-nr",
		.data		= &inodes_stat,
		.maxlen		= 2*sizeof(int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= FS_STATINODE,
		.procname	= "inode-state",
		.data		= &inodes_stat,
		.maxlen		= 7*sizeof(int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
	{
		.procname	= "file-nr",
		.data		= &files_stat,
		.maxlen		= 3*sizeof(int),
		.mode		= 0444,
Dipankar Sarma's avatar
Dipankar Sarma committed
1197
		.proc_handler	= &proc_nr_files,
Linus Torvalds's avatar
Linus Torvalds committed
1198 1199 1200 1201 1202 1203 1204 1205 1206
	},
	{
		.ctl_name	= FS_MAXFILE,
		.procname	= "file-max",
		.data		= &files_stat.max_files,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
1207 1208 1209 1210 1211 1212
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "nr_open",
		.data		= &sysctl_nr_open,
		.maxlen		= sizeof(int),
		.mode		= 0644,
1213 1214 1215
		.proc_handler	= &proc_dointvec_minmax,
		.extra1		= &sysctl_nr_open_min,
		.extra2		= &sysctl_nr_open_max,
1216
	},
Linus Torvalds's avatar
Linus Torvalds committed
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
	{
		.ctl_name	= FS_DENTRY,
		.procname	= "dentry-state",
		.data		= &dentry_stat,
		.maxlen		= 6*sizeof(int),
		.mode		= 0444,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= FS_OVERFLOWUID,
		.procname	= "overflowuid",
		.data		= &fs_overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.ctl_name	= FS_OVERFLOWGID,
		.procname	= "overflowgid",
		.data		= &fs_overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.ctl_name	= FS_LEASES,
		.procname	= "leases-enable",
		.data		= &leases_enable,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#ifdef CONFIG_DNOTIFY
	{
		.ctl_name	= FS_DIR_NOTIFY,
		.procname	= "dir-notify-enable",
		.data		= &dir_notify_enable,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
#endif
#ifdef CONFIG_MMU
	{
		.ctl_name	= FS_LEASE_TIME,
		.procname	= "lease-break-time",
		.data		= &lease_break_time,
		.maxlen		= sizeof(int),
		.mode		= 0644,
1272 1273 1274 1275
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= &zero,
		.extra2		= &two,
Linus Torvalds's avatar
Linus Torvalds committed
1276 1277 1278 1279 1280 1281
	},
	{
		.procname	= "aio-nr",
		.data		= &aio_nr,
		.maxlen		= sizeof(aio_nr),
		.mode		= 0444,
1282
		.proc_handler	= &proc_doulongvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
1283 1284 1285 1286 1287 1288
	},
	{
		.procname	= "aio-max-nr",
		.data		= &aio_max_nr,
		.maxlen		= sizeof(aio_max_nr),
		.mode		= 0644,
1289
		.proc_handler	= &proc_doulongvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
1290
	},
1291
#ifdef CONFIG_INOTIFY_USER
Robert Love's avatar
Robert Love committed
1292 1293 1294 1295 1296 1297 1298
	{
		.ctl_name	= FS_INOTIFY,
		.procname	= "inotify",
		.mode		= 0555,
		.child		= inotify_table,
	},
#endif	
Linus Torvalds's avatar
Linus Torvalds committed
1299
#endif
Alan Cox's avatar
Alan Cox committed
1300 1301 1302 1303 1304 1305 1306 1307
	{
		.ctl_name	= KERN_SETUID_DUMPABLE,
		.procname	= "suid_dumpable",
		.data		= &suid_dumpable,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
1308 1309 1310 1311 1312 1313 1314 1315
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "binfmt_misc",
		.mode		= 0555,
		.child		= binfmt_misc_table,
	},
#endif
1316 1317 1318 1319
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
Linus Torvalds's avatar
Linus Torvalds committed
1320 1321 1322
	{ .ctl_name = 0 }
};

1323
static struct ctl_table debug_table[] = {
1324
#if defined(CONFIG_X86) || defined(CONFIG_PPC)
1325 1326 1327 1328 1329 1330 1331 1332 1333
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "exception-trace",
		.data		= &show_unhandled_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
1334 1335 1336
	{ .ctl_name = 0 }
};

1337
static struct ctl_table dev_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
1338
	{ .ctl_name = 0 }
Robert Love's avatar
Robert Love committed
1339
};
Linus Torvalds's avatar
Linus Torvalds committed
1340

1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
static DEFINE_SPINLOCK(sysctl_lock);

/* called under sysctl_lock */
static int use_table(struct ctl_table_header *p)