2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
55 #include <asm/stacktrace.h>
59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
61 #if defined(CONFIG_SYSCTL)
63 /* External variables not in a header file. */
65 extern int print_fatal_signals;
66 extern int sysctl_overcommit_memory;
67 extern int sysctl_overcommit_ratio;
68 extern int sysctl_panic_on_oom;
69 extern int sysctl_oom_kill_allocating_task;
70 extern int sysctl_oom_dump_tasks;
71 extern int max_threads;
72 extern int core_uses_pid;
73 extern int suid_dumpable;
74 extern char core_pattern[];
76 extern int min_free_kbytes;
77 extern int pid_max_min, pid_max_max;
78 extern int sysctl_drop_caches;
79 extern int percpu_pagelist_fraction;
80 extern int compat_log;
81 extern int maps_protect;
82 extern int sysctl_stat_interval;
83 extern int latencytop_enabled;
84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
86 /* Constants used for minimum and maximum */
87 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
91 #ifdef CONFIG_DETECT_SOFTLOCKUP
92 static int sixty = 60;
93 static int neg_one = -1;
101 static int one_hundred = 100;
103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
104 static int maxolduid = 65535;
105 static int minolduid;
106 static int min_percpu_pagelist_fract = 8;
108 static int ngroups_max = NGROUPS_MAX;
111 extern char modprobe_path[];
113 #ifdef CONFIG_CHR_DEV_SG
114 extern int sg_big_buff;
118 extern char reboot_command [];
119 extern int stop_a_enabled;
120 extern int scons_pwroff;
124 extern int pwrsw_enabled;
125 extern int unaligned_enabled;
129 #ifdef CONFIG_MATHEMU
130 extern int sysctl_ieee_emulation_warnings;
132 extern int sysctl_userprocess_debug;
133 extern int spin_retry;
136 extern int sysctl_hz_timer;
138 #ifdef CONFIG_BSD_PROCESS_ACCT
139 extern int acct_parm[];
143 extern int no_unaligned_warning;
146 #ifdef CONFIG_RT_MUTEXES
147 extern int max_lock_depth;
150 #ifdef CONFIG_PROC_SYSCTL
151 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
152 void __user *buffer, size_t *lenp, loff_t *ppos);
153 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
154 void __user *buffer, size_t *lenp, loff_t *ppos);
157 static struct ctl_table root_table[];
158 static struct ctl_table_root sysctl_table_root;
159 static struct ctl_table_header root_table_header = {
160 .ctl_table = root_table,
161 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
162 .root = &sysctl_table_root,
164 static struct ctl_table_root sysctl_table_root = {
165 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
166 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
169 static struct ctl_table kern_table[];
170 static struct ctl_table vm_table[];
171 static struct ctl_table fs_table[];
172 static struct ctl_table debug_table[];
173 static struct ctl_table dev_table[];
174 extern struct ctl_table random_table[];
175 #ifdef CONFIG_INOTIFY_USER
176 extern struct ctl_table inotify_table[];
179 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
180 int sysctl_legacy_va_layout;
183 extern int prove_locking;
184 extern int lock_stat;
186 /* The default sysctl tables: */
188 static struct ctl_table root_table[] = {
190 .ctl_name = CTL_KERN,
191 .procname = "kernel",
208 .ctl_name = CTL_DEBUG,
211 .child = debug_table,
220 * NOTE: do not add new entries to this table unless you have read
221 * Documentation/sysctl/ctl_unnumbered.txt
226 #ifdef CONFIG_SCHED_DEBUG
227 static int min_sched_granularity_ns = 100000; /* 100 usecs */
228 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
229 static int min_wakeup_granularity_ns; /* 0 usecs */
230 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
233 static struct ctl_table kern_table[] = {
234 #ifdef CONFIG_SCHED_DEBUG
236 .ctl_name = CTL_UNNUMBERED,
237 .procname = "sched_min_granularity_ns",
238 .data = &sysctl_sched_min_granularity,
239 .maxlen = sizeof(unsigned int),
241 .proc_handler = &sched_nr_latency_handler,
242 .strategy = &sysctl_intvec,
243 .extra1 = &min_sched_granularity_ns,
244 .extra2 = &max_sched_granularity_ns,
247 .ctl_name = CTL_UNNUMBERED,
248 .procname = "sched_latency_ns",
249 .data = &sysctl_sched_latency,
250 .maxlen = sizeof(unsigned int),
252 .proc_handler = &sched_nr_latency_handler,
253 .strategy = &sysctl_intvec,
254 .extra1 = &min_sched_granularity_ns,
255 .extra2 = &max_sched_granularity_ns,
258 .ctl_name = CTL_UNNUMBERED,
259 .procname = "sched_wakeup_granularity_ns",
260 .data = &sysctl_sched_wakeup_granularity,
261 .maxlen = sizeof(unsigned int),
263 .proc_handler = &proc_dointvec_minmax,
264 .strategy = &sysctl_intvec,
265 .extra1 = &min_wakeup_granularity_ns,
266 .extra2 = &max_wakeup_granularity_ns,
269 .ctl_name = CTL_UNNUMBERED,
270 .procname = "sched_child_runs_first",
271 .data = &sysctl_sched_child_runs_first,
272 .maxlen = sizeof(unsigned int),
274 .proc_handler = &proc_dointvec,
277 .ctl_name = CTL_UNNUMBERED,
278 .procname = "sched_features",
279 .data = &sysctl_sched_features,
280 .maxlen = sizeof(unsigned int),
282 .proc_handler = &proc_dointvec,
285 .ctl_name = CTL_UNNUMBERED,
286 .procname = "sched_migration_cost",
287 .data = &sysctl_sched_migration_cost,
288 .maxlen = sizeof(unsigned int),
290 .proc_handler = &proc_dointvec,
293 .ctl_name = CTL_UNNUMBERED,
294 .procname = "sched_nr_migrate",
295 .data = &sysctl_sched_nr_migrate,
296 .maxlen = sizeof(unsigned int),
298 .proc_handler = &proc_dointvec,
302 .ctl_name = CTL_UNNUMBERED,
303 .procname = "sched_rt_period_us",
304 .data = &sysctl_sched_rt_period,
305 .maxlen = sizeof(unsigned int),
307 .proc_handler = &sched_rt_handler,
310 .ctl_name = CTL_UNNUMBERED,
311 .procname = "sched_rt_runtime_us",
312 .data = &sysctl_sched_rt_runtime,
313 .maxlen = sizeof(int),
315 .proc_handler = &sched_rt_handler,
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_compat_yield",
320 .data = &sysctl_sched_compat_yield,
321 .maxlen = sizeof(unsigned int),
323 .proc_handler = &proc_dointvec,
325 #ifdef CONFIG_PROVE_LOCKING
327 .ctl_name = CTL_UNNUMBERED,
328 .procname = "prove_locking",
329 .data = &prove_locking,
330 .maxlen = sizeof(int),
332 .proc_handler = &proc_dointvec,
335 #ifdef CONFIG_LOCK_STAT
337 .ctl_name = CTL_UNNUMBERED,
338 .procname = "lock_stat",
340 .maxlen = sizeof(int),
342 .proc_handler = &proc_dointvec,
346 .ctl_name = KERN_PANIC,
348 .data = &panic_timeout,
349 .maxlen = sizeof(int),
351 .proc_handler = &proc_dointvec,
354 .ctl_name = KERN_CORE_USES_PID,
355 .procname = "core_uses_pid",
356 .data = &core_uses_pid,
357 .maxlen = sizeof(int),
359 .proc_handler = &proc_dointvec,
362 .ctl_name = KERN_CORE_PATTERN,
363 .procname = "core_pattern",
364 .data = core_pattern,
365 .maxlen = CORENAME_MAX_SIZE,
367 .proc_handler = &proc_dostring,
368 .strategy = &sysctl_string,
370 #ifdef CONFIG_PROC_SYSCTL
372 .procname = "tainted",
374 .maxlen = sizeof(int),
376 .proc_handler = &proc_dointvec_taint,
379 #ifdef CONFIG_LATENCYTOP
381 .procname = "latencytop",
382 .data = &latencytop_enabled,
383 .maxlen = sizeof(int),
385 .proc_handler = &proc_dointvec,
388 #ifdef CONFIG_BLK_DEV_INITRD
390 .ctl_name = KERN_REALROOTDEV,
391 .procname = "real-root-dev",
392 .data = &real_root_dev,
393 .maxlen = sizeof(int),
395 .proc_handler = &proc_dointvec,
399 .ctl_name = CTL_UNNUMBERED,
400 .procname = "print-fatal-signals",
401 .data = &print_fatal_signals,
402 .maxlen = sizeof(int),
404 .proc_handler = &proc_dointvec,
408 .ctl_name = KERN_SPARC_REBOOT,
409 .procname = "reboot-cmd",
410 .data = reboot_command,
413 .proc_handler = &proc_dostring,
414 .strategy = &sysctl_string,
417 .ctl_name = KERN_SPARC_STOP_A,
418 .procname = "stop-a",
419 .data = &stop_a_enabled,
420 .maxlen = sizeof (int),
422 .proc_handler = &proc_dointvec,
425 .ctl_name = KERN_SPARC_SCONS_PWROFF,
426 .procname = "scons-poweroff",
427 .data = &scons_pwroff,
428 .maxlen = sizeof (int),
430 .proc_handler = &proc_dointvec,
435 .ctl_name = KERN_HPPA_PWRSW,
436 .procname = "soft-power",
437 .data = &pwrsw_enabled,
438 .maxlen = sizeof (int),
440 .proc_handler = &proc_dointvec,
443 .ctl_name = KERN_HPPA_UNALIGNED,
444 .procname = "unaligned-trap",
445 .data = &unaligned_enabled,
446 .maxlen = sizeof (int),
448 .proc_handler = &proc_dointvec,
452 .ctl_name = KERN_CTLALTDEL,
453 .procname = "ctrl-alt-del",
455 .maxlen = sizeof(int),
457 .proc_handler = &proc_dointvec,
461 .ctl_name = KERN_MODPROBE,
462 .procname = "modprobe",
463 .data = &modprobe_path,
464 .maxlen = KMOD_PATH_LEN,
466 .proc_handler = &proc_dostring,
467 .strategy = &sysctl_string,
470 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
472 .ctl_name = KERN_HOTPLUG,
473 .procname = "hotplug",
474 .data = &uevent_helper,
475 .maxlen = UEVENT_HELPER_PATH_LEN,
477 .proc_handler = &proc_dostring,
478 .strategy = &sysctl_string,
481 #ifdef CONFIG_CHR_DEV_SG
483 .ctl_name = KERN_SG_BIG_BUFF,
484 .procname = "sg-big-buff",
485 .data = &sg_big_buff,
486 .maxlen = sizeof (int),
488 .proc_handler = &proc_dointvec,
491 #ifdef CONFIG_BSD_PROCESS_ACCT
493 .ctl_name = KERN_ACCT,
496 .maxlen = 3*sizeof(int),
498 .proc_handler = &proc_dointvec,
501 #ifdef CONFIG_MAGIC_SYSRQ
503 .ctl_name = KERN_SYSRQ,
505 .data = &__sysrq_enabled,
506 .maxlen = sizeof (int),
508 .proc_handler = &proc_dointvec,
511 #ifdef CONFIG_PROC_SYSCTL
513 .procname = "cad_pid",
515 .maxlen = sizeof (int),
517 .proc_handler = &proc_do_cad_pid,
521 .ctl_name = KERN_MAX_THREADS,
522 .procname = "threads-max",
523 .data = &max_threads,
524 .maxlen = sizeof(int),
526 .proc_handler = &proc_dointvec,
529 .ctl_name = KERN_RANDOM,
530 .procname = "random",
532 .child = random_table,
535 .ctl_name = KERN_OVERFLOWUID,
536 .procname = "overflowuid",
537 .data = &overflowuid,
538 .maxlen = sizeof(int),
540 .proc_handler = &proc_dointvec_minmax,
541 .strategy = &sysctl_intvec,
542 .extra1 = &minolduid,
543 .extra2 = &maxolduid,
546 .ctl_name = KERN_OVERFLOWGID,
547 .procname = "overflowgid",
548 .data = &overflowgid,
549 .maxlen = sizeof(int),
551 .proc_handler = &proc_dointvec_minmax,
552 .strategy = &sysctl_intvec,
553 .extra1 = &minolduid,
554 .extra2 = &maxolduid,
557 #ifdef CONFIG_MATHEMU
559 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
560 .procname = "ieee_emulation_warnings",
561 .data = &sysctl_ieee_emulation_warnings,
562 .maxlen = sizeof(int),
564 .proc_handler = &proc_dointvec,
567 #ifdef CONFIG_NO_IDLE_HZ
569 .ctl_name = KERN_HZ_TIMER,
570 .procname = "hz_timer",
571 .data = &sysctl_hz_timer,
572 .maxlen = sizeof(int),
574 .proc_handler = &proc_dointvec,
578 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
579 .procname = "userprocess_debug",
580 .data = &sysctl_userprocess_debug,
581 .maxlen = sizeof(int),
583 .proc_handler = &proc_dointvec,
587 .ctl_name = KERN_PIDMAX,
588 .procname = "pid_max",
590 .maxlen = sizeof (int),
592 .proc_handler = &proc_dointvec_minmax,
593 .strategy = sysctl_intvec,
594 .extra1 = &pid_max_min,
595 .extra2 = &pid_max_max,
598 .ctl_name = KERN_PANIC_ON_OOPS,
599 .procname = "panic_on_oops",
600 .data = &panic_on_oops,
601 .maxlen = sizeof(int),
603 .proc_handler = &proc_dointvec,
605 #if defined CONFIG_PRINTK
607 .ctl_name = KERN_PRINTK,
608 .procname = "printk",
609 .data = &console_loglevel,
610 .maxlen = 4*sizeof(int),
612 .proc_handler = &proc_dointvec,
615 .ctl_name = KERN_PRINTK_RATELIMIT,
616 .procname = "printk_ratelimit",
617 .data = &printk_ratelimit_jiffies,
618 .maxlen = sizeof(int),
620 .proc_handler = &proc_dointvec_jiffies,
621 .strategy = &sysctl_jiffies,
624 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
625 .procname = "printk_ratelimit_burst",
626 .data = &printk_ratelimit_burst,
627 .maxlen = sizeof(int),
629 .proc_handler = &proc_dointvec,
633 .ctl_name = KERN_NGROUPS_MAX,
634 .procname = "ngroups_max",
635 .data = &ngroups_max,
636 .maxlen = sizeof (int),
638 .proc_handler = &proc_dointvec,
640 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
642 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
643 .procname = "unknown_nmi_panic",
644 .data = &unknown_nmi_panic,
645 .maxlen = sizeof (int),
647 .proc_handler = &proc_dointvec,
650 .procname = "nmi_watchdog",
651 .data = &nmi_watchdog_enabled,
652 .maxlen = sizeof (int),
654 .proc_handler = &proc_nmi_enabled,
657 #if defined(CONFIG_X86)
659 .ctl_name = KERN_PANIC_ON_NMI,
660 .procname = "panic_on_unrecovered_nmi",
661 .data = &panic_on_unrecovered_nmi,
662 .maxlen = sizeof(int),
664 .proc_handler = &proc_dointvec,
667 .ctl_name = KERN_BOOTLOADER_TYPE,
668 .procname = "bootloader_type",
669 .data = &bootloader_type,
670 .maxlen = sizeof (int),
672 .proc_handler = &proc_dointvec,
675 .ctl_name = CTL_UNNUMBERED,
676 .procname = "kstack_depth_to_print",
677 .data = &kstack_depth_to_print,
678 .maxlen = sizeof(int),
680 .proc_handler = &proc_dointvec,
683 .ctl_name = CTL_UNNUMBERED,
684 .procname = "io_delay_type",
685 .data = &io_delay_type,
686 .maxlen = sizeof(int),
688 .proc_handler = &proc_dointvec,
691 #if defined(CONFIG_MMU)
693 .ctl_name = KERN_RANDOMIZE,
694 .procname = "randomize_va_space",
695 .data = &randomize_va_space,
696 .maxlen = sizeof(int),
698 .proc_handler = &proc_dointvec,
701 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
703 .ctl_name = KERN_SPIN_RETRY,
704 .procname = "spin_retry",
706 .maxlen = sizeof (int),
708 .proc_handler = &proc_dointvec,
711 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
713 .procname = "acpi_video_flags",
714 .data = &acpi_realmode_flags,
715 .maxlen = sizeof (unsigned long),
717 .proc_handler = &proc_doulongvec_minmax,
722 .ctl_name = KERN_IA64_UNALIGNED,
723 .procname = "ignore-unaligned-usertrap",
724 .data = &no_unaligned_warning,
725 .maxlen = sizeof (int),
727 .proc_handler = &proc_dointvec,
730 #ifdef CONFIG_DETECT_SOFTLOCKUP
732 .ctl_name = CTL_UNNUMBERED,
733 .procname = "softlockup_panic",
734 .data = &softlockup_panic,
735 .maxlen = sizeof(int),
737 .proc_handler = &proc_doulongvec_minmax,
738 .strategy = &sysctl_intvec,
743 .ctl_name = CTL_UNNUMBERED,
744 .procname = "softlockup_thresh",
745 .data = &softlockup_thresh,
746 .maxlen = sizeof(int),
748 .proc_handler = &proc_dointvec_minmax,
749 .strategy = &sysctl_intvec,
754 .ctl_name = CTL_UNNUMBERED,
755 .procname = "hung_task_check_count",
756 .data = &sysctl_hung_task_check_count,
757 .maxlen = sizeof(unsigned long),
759 .proc_handler = &proc_doulongvec_minmax,
760 .strategy = &sysctl_intvec,
763 .ctl_name = CTL_UNNUMBERED,
764 .procname = "hung_task_timeout_secs",
765 .data = &sysctl_hung_task_timeout_secs,
766 .maxlen = sizeof(unsigned long),
768 .proc_handler = &proc_doulongvec_minmax,
769 .strategy = &sysctl_intvec,
772 .ctl_name = CTL_UNNUMBERED,
773 .procname = "hung_task_warnings",
774 .data = &sysctl_hung_task_warnings,
775 .maxlen = sizeof(unsigned long),
777 .proc_handler = &proc_doulongvec_minmax,
778 .strategy = &sysctl_intvec,
783 .ctl_name = KERN_COMPAT_LOG,
784 .procname = "compat-log",
786 .maxlen = sizeof (int),
788 .proc_handler = &proc_dointvec,
791 #ifdef CONFIG_RT_MUTEXES
793 .ctl_name = KERN_MAX_LOCK_DEPTH,
794 .procname = "max_lock_depth",
795 .data = &max_lock_depth,
796 .maxlen = sizeof(int),
798 .proc_handler = &proc_dointvec,
801 #ifdef CONFIG_PROC_FS
803 .ctl_name = CTL_UNNUMBERED,
804 .procname = "maps_protect",
805 .data = &maps_protect,
806 .maxlen = sizeof(int),
808 .proc_handler = &proc_dointvec,
812 .ctl_name = CTL_UNNUMBERED,
813 .procname = "poweroff_cmd",
814 .data = &poweroff_cmd,
815 .maxlen = POWEROFF_CMD_PATH_LEN,
817 .proc_handler = &proc_dostring,
818 .strategy = &sysctl_string,
822 .ctl_name = CTL_UNNUMBERED,
825 .child = key_sysctls,
829 * NOTE: do not add new entries to this table unless you have read
830 * Documentation/sysctl/ctl_unnumbered.txt
835 static struct ctl_table vm_table[] = {
837 .ctl_name = VM_OVERCOMMIT_MEMORY,
838 .procname = "overcommit_memory",
839 .data = &sysctl_overcommit_memory,
840 .maxlen = sizeof(sysctl_overcommit_memory),
842 .proc_handler = &proc_dointvec,
845 .ctl_name = VM_PANIC_ON_OOM,
846 .procname = "panic_on_oom",
847 .data = &sysctl_panic_on_oom,
848 .maxlen = sizeof(sysctl_panic_on_oom),
850 .proc_handler = &proc_dointvec,
853 .ctl_name = CTL_UNNUMBERED,
854 .procname = "oom_kill_allocating_task",
855 .data = &sysctl_oom_kill_allocating_task,
856 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
858 .proc_handler = &proc_dointvec,
861 .ctl_name = CTL_UNNUMBERED,
862 .procname = "oom_dump_tasks",
863 .data = &sysctl_oom_dump_tasks,
864 .maxlen = sizeof(sysctl_oom_dump_tasks),
866 .proc_handler = &proc_dointvec,
869 .ctl_name = VM_OVERCOMMIT_RATIO,
870 .procname = "overcommit_ratio",
871 .data = &sysctl_overcommit_ratio,
872 .maxlen = sizeof(sysctl_overcommit_ratio),
874 .proc_handler = &proc_dointvec,
877 .ctl_name = VM_PAGE_CLUSTER,
878 .procname = "page-cluster",
879 .data = &page_cluster,
880 .maxlen = sizeof(int),
882 .proc_handler = &proc_dointvec,
885 .ctl_name = VM_DIRTY_BACKGROUND,
886 .procname = "dirty_background_ratio",
887 .data = &dirty_background_ratio,
888 .maxlen = sizeof(dirty_background_ratio),
890 .proc_handler = &proc_dointvec_minmax,
891 .strategy = &sysctl_intvec,
893 .extra2 = &one_hundred,
896 .ctl_name = VM_DIRTY_RATIO,
897 .procname = "dirty_ratio",
898 .data = &vm_dirty_ratio,
899 .maxlen = sizeof(vm_dirty_ratio),
901 .proc_handler = &dirty_ratio_handler,
902 .strategy = &sysctl_intvec,
904 .extra2 = &one_hundred,
907 .procname = "dirty_writeback_centisecs",
908 .data = &dirty_writeback_interval,
909 .maxlen = sizeof(dirty_writeback_interval),
911 .proc_handler = &dirty_writeback_centisecs_handler,
914 .procname = "dirty_expire_centisecs",
915 .data = &dirty_expire_interval,
916 .maxlen = sizeof(dirty_expire_interval),
918 .proc_handler = &proc_dointvec_userhz_jiffies,
921 .ctl_name = VM_NR_PDFLUSH_THREADS,
922 .procname = "nr_pdflush_threads",
923 .data = &nr_pdflush_threads,
924 .maxlen = sizeof nr_pdflush_threads,
925 .mode = 0444 /* read-only*/,
926 .proc_handler = &proc_dointvec,
929 .ctl_name = VM_SWAPPINESS,
930 .procname = "swappiness",
931 .data = &vm_swappiness,
932 .maxlen = sizeof(vm_swappiness),
934 .proc_handler = &proc_dointvec_minmax,
935 .strategy = &sysctl_intvec,
937 .extra2 = &one_hundred,
939 #ifdef CONFIG_HUGETLB_PAGE
941 .procname = "nr_hugepages",
942 .data = &max_huge_pages,
943 .maxlen = sizeof(unsigned long),
945 .proc_handler = &hugetlb_sysctl_handler,
946 .extra1 = (void *)&hugetlb_zero,
947 .extra2 = (void *)&hugetlb_infinity,
950 .ctl_name = VM_HUGETLB_GROUP,
951 .procname = "hugetlb_shm_group",
952 .data = &sysctl_hugetlb_shm_group,
953 .maxlen = sizeof(gid_t),
955 .proc_handler = &proc_dointvec,
958 .ctl_name = CTL_UNNUMBERED,
959 .procname = "hugepages_treat_as_movable",
960 .data = &hugepages_treat_as_movable,
961 .maxlen = sizeof(int),
963 .proc_handler = &hugetlb_treat_movable_handler,
966 .ctl_name = CTL_UNNUMBERED,
967 .procname = "nr_overcommit_hugepages",
968 .data = &sysctl_overcommit_huge_pages,
969 .maxlen = sizeof(sysctl_overcommit_huge_pages),
971 .proc_handler = &hugetlb_overcommit_handler,
975 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
976 .procname = "lowmem_reserve_ratio",
977 .data = &sysctl_lowmem_reserve_ratio,
978 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
980 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
981 .strategy = &sysctl_intvec,
984 .ctl_name = VM_DROP_PAGECACHE,
985 .procname = "drop_caches",
986 .data = &sysctl_drop_caches,
987 .maxlen = sizeof(int),
989 .proc_handler = drop_caches_sysctl_handler,
990 .strategy = &sysctl_intvec,
993 .ctl_name = VM_MIN_FREE_KBYTES,
994 .procname = "min_free_kbytes",
995 .data = &min_free_kbytes,
996 .maxlen = sizeof(min_free_kbytes),
998 .proc_handler = &min_free_kbytes_sysctl_handler,
999 .strategy = &sysctl_intvec,
1003 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1004 .procname = "percpu_pagelist_fraction",
1005 .data = &percpu_pagelist_fraction,
1006 .maxlen = sizeof(percpu_pagelist_fraction),
1008 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1009 .strategy = &sysctl_intvec,
1010 .extra1 = &min_percpu_pagelist_fract,
1014 .ctl_name = VM_MAX_MAP_COUNT,
1015 .procname = "max_map_count",
1016 .data = &sysctl_max_map_count,
1017 .maxlen = sizeof(sysctl_max_map_count),
1019 .proc_handler = &proc_dointvec
1023 .ctl_name = VM_LAPTOP_MODE,
1024 .procname = "laptop_mode",
1025 .data = &laptop_mode,
1026 .maxlen = sizeof(laptop_mode),
1028 .proc_handler = &proc_dointvec_jiffies,
1029 .strategy = &sysctl_jiffies,
1032 .ctl_name = VM_BLOCK_DUMP,
1033 .procname = "block_dump",
1034 .data = &block_dump,
1035 .maxlen = sizeof(block_dump),
1037 .proc_handler = &proc_dointvec,
1038 .strategy = &sysctl_intvec,
1042 .ctl_name = VM_VFS_CACHE_PRESSURE,
1043 .procname = "vfs_cache_pressure",
1044 .data = &sysctl_vfs_cache_pressure,
1045 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1047 .proc_handler = &proc_dointvec,
1048 .strategy = &sysctl_intvec,
1051 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1053 .ctl_name = VM_LEGACY_VA_LAYOUT,
1054 .procname = "legacy_va_layout",
1055 .data = &sysctl_legacy_va_layout,
1056 .maxlen = sizeof(sysctl_legacy_va_layout),
1058 .proc_handler = &proc_dointvec,
1059 .strategy = &sysctl_intvec,
1065 .ctl_name = VM_ZONE_RECLAIM_MODE,
1066 .procname = "zone_reclaim_mode",
1067 .data = &zone_reclaim_mode,
1068 .maxlen = sizeof(zone_reclaim_mode),
1070 .proc_handler = &proc_dointvec,
1071 .strategy = &sysctl_intvec,
1075 .ctl_name = VM_MIN_UNMAPPED,
1076 .procname = "min_unmapped_ratio",
1077 .data = &sysctl_min_unmapped_ratio,
1078 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1080 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1081 .strategy = &sysctl_intvec,
1083 .extra2 = &one_hundred,
1086 .ctl_name = VM_MIN_SLAB,
1087 .procname = "min_slab_ratio",
1088 .data = &sysctl_min_slab_ratio,
1089 .maxlen = sizeof(sysctl_min_slab_ratio),
1091 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1092 .strategy = &sysctl_intvec,
1094 .extra2 = &one_hundred,
1099 .ctl_name = CTL_UNNUMBERED,
1100 .procname = "stat_interval",
1101 .data = &sysctl_stat_interval,
1102 .maxlen = sizeof(sysctl_stat_interval),
1104 .proc_handler = &proc_dointvec_jiffies,
1105 .strategy = &sysctl_jiffies,
1108 #ifdef CONFIG_SECURITY
1110 .ctl_name = CTL_UNNUMBERED,
1111 .procname = "mmap_min_addr",
1112 .data = &mmap_min_addr,
1113 .maxlen = sizeof(unsigned long),
1115 .proc_handler = &proc_doulongvec_minmax,
1120 .ctl_name = CTL_UNNUMBERED,
1121 .procname = "numa_zonelist_order",
1122 .data = &numa_zonelist_order,
1123 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1125 .proc_handler = &numa_zonelist_order_handler,
1126 .strategy = &sysctl_string,
1129 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1130 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1132 .ctl_name = VM_VDSO_ENABLED,
1133 .procname = "vdso_enabled",
1134 .data = &vdso_enabled,
1135 .maxlen = sizeof(vdso_enabled),
1137 .proc_handler = &proc_dointvec,
1138 .strategy = &sysctl_intvec,
1142 #ifdef CONFIG_HIGHMEM
1144 .ctl_name = CTL_UNNUMBERED,
1145 .procname = "highmem_is_dirtyable",
1146 .data = &vm_highmem_is_dirtyable,
1147 .maxlen = sizeof(vm_highmem_is_dirtyable),
1149 .proc_handler = &proc_dointvec_minmax,
1150 .strategy = &sysctl_intvec,
1156 * NOTE: do not add new entries to this table unless you have read
1157 * Documentation/sysctl/ctl_unnumbered.txt
1162 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1163 static struct ctl_table binfmt_misc_table[] = {
1168 static struct ctl_table fs_table[] = {
1170 .ctl_name = FS_NRINODE,
1171 .procname = "inode-nr",
1172 .data = &inodes_stat,
1173 .maxlen = 2*sizeof(int),
1175 .proc_handler = &proc_dointvec,
1178 .ctl_name = FS_STATINODE,
1179 .procname = "inode-state",
1180 .data = &inodes_stat,
1181 .maxlen = 7*sizeof(int),
1183 .proc_handler = &proc_dointvec,
1186 .procname = "file-nr",
1187 .data = &files_stat,
1188 .maxlen = 3*sizeof(int),
1190 .proc_handler = &proc_nr_files,
1193 .ctl_name = FS_MAXFILE,
1194 .procname = "file-max",
1195 .data = &files_stat.max_files,
1196 .maxlen = sizeof(int),
1198 .proc_handler = &proc_dointvec,
1201 .ctl_name = CTL_UNNUMBERED,
1202 .procname = "nr_open",
1203 .data = &sysctl_nr_open,
1204 .maxlen = sizeof(int),
1206 .proc_handler = &proc_dointvec_minmax,
1207 .extra1 = &sysctl_nr_open_min,
1208 .extra2 = &sysctl_nr_open_max,
1211 .ctl_name = FS_DENTRY,
1212 .procname = "dentry-state",
1213 .data = &dentry_stat,
1214 .maxlen = 6*sizeof(int),
1216 .proc_handler = &proc_dointvec,
1219 .ctl_name = FS_OVERFLOWUID,
1220 .procname = "overflowuid",
1221 .data = &fs_overflowuid,
1222 .maxlen = sizeof(int),
1224 .proc_handler = &proc_dointvec_minmax,
1225 .strategy = &sysctl_intvec,
1226 .extra1 = &minolduid,
1227 .extra2 = &maxolduid,
1230 .ctl_name = FS_OVERFLOWGID,
1231 .procname = "overflowgid",
1232 .data = &fs_overflowgid,
1233 .maxlen = sizeof(int),
1235 .proc_handler = &proc_dointvec_minmax,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &minolduid,
1238 .extra2 = &maxolduid,
1241 .ctl_name = FS_LEASES,
1242 .procname = "leases-enable",
1243 .data = &leases_enable,
1244 .maxlen = sizeof(int),
1246 .proc_handler = &proc_dointvec,
1248 #ifdef CONFIG_DNOTIFY
1250 .ctl_name = FS_DIR_NOTIFY,
1251 .procname = "dir-notify-enable",
1252 .data = &dir_notify_enable,
1253 .maxlen = sizeof(int),
1255 .proc_handler = &proc_dointvec,
1260 .ctl_name = FS_LEASE_TIME,
1261 .procname = "lease-break-time",
1262 .data = &lease_break_time,
1263 .maxlen = sizeof(int),
1265 .proc_handler = &proc_dointvec_minmax,
1266 .strategy = &sysctl_intvec,
1271 .procname = "aio-nr",
1273 .maxlen = sizeof(aio_nr),
1275 .proc_handler = &proc_doulongvec_minmax,
1278 .procname = "aio-max-nr",
1279 .data = &aio_max_nr,
1280 .maxlen = sizeof(aio_max_nr),
1282 .proc_handler = &proc_doulongvec_minmax,
1284 #ifdef CONFIG_INOTIFY_USER
1286 .ctl_name = FS_INOTIFY,
1287 .procname = "inotify",
1289 .child = inotify_table,
1294 .ctl_name = KERN_SETUID_DUMPABLE,
1295 .procname = "suid_dumpable",
1296 .data = &suid_dumpable,
1297 .maxlen = sizeof(int),
1299 .proc_handler = &proc_dointvec,
1301 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1303 .ctl_name = CTL_UNNUMBERED,
1304 .procname = "binfmt_misc",
1306 .child = binfmt_misc_table,
1310 * NOTE: do not add new entries to this table unless you have read
1311 * Documentation/sysctl/ctl_unnumbered.txt
1316 static struct ctl_table debug_table[] = {
1317 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1319 .ctl_name = CTL_UNNUMBERED,
1320 .procname = "exception-trace",
1321 .data = &show_unhandled_signals,
1322 .maxlen = sizeof(int),
1324 .proc_handler = proc_dointvec
1330 static struct ctl_table dev_table[] = {
1334 static DEFINE_SPINLOCK(sysctl_lock);
1336 /* called under sysctl_lock */
1337 static int use_table(struct ctl_table_header *p)
1339 if (unlikely(p->unregistering))
1345 /* called under sysctl_lock */
1346 static void unuse_table(struct ctl_table_header *p)
1349 if (unlikely(p->unregistering))
1350 complete(p->unregistering);
1353 /* called under sysctl_lock, will reacquire if has to wait */
1354 static void start_unregistering(struct ctl_table_header *p)
1357 * if p->used is 0, nobody will ever touch that entry again;
1358 * we'll eliminate all paths to it before dropping sysctl_lock
1360 if (unlikely(p->used)) {
1361 struct completion wait;
1362 init_completion(&wait);
1363 p->unregistering = &wait;
1364 spin_unlock(&sysctl_lock);
1365 wait_for_completion(&wait);
1366 spin_lock(&sysctl_lock);
1369 * do not remove from the list until nobody holds it; walking the
1370 * list in do_sysctl() relies on that.
1372 list_del_init(&p->ctl_entry);
1375 void sysctl_head_finish(struct ctl_table_header *head)
1379 spin_lock(&sysctl_lock);
1381 spin_unlock(&sysctl_lock);
1384 static struct list_head *
1385 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1387 struct list_head *header_list;
1388 header_list = &root->header_list;
1390 header_list = root->lookup(root, namespaces);
1394 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1395 struct ctl_table_header *prev)
1397 struct ctl_table_root *root;
1398 struct list_head *header_list;
1399 struct ctl_table_header *head;
1400 struct list_head *tmp;
1402 spin_lock(&sysctl_lock);
1405 tmp = &prev->ctl_entry;
1409 tmp = &root_table_header.ctl_entry;
1411 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1413 if (!use_table(head))
1415 spin_unlock(&sysctl_lock);
1420 header_list = lookup_header_list(root, namespaces);
1421 if (tmp != header_list)
1425 root = list_entry(root->root_list.next,
1426 struct ctl_table_root, root_list);
1427 if (root == &sysctl_table_root)
1429 header_list = lookup_header_list(root, namespaces);
1430 } while (list_empty(header_list));
1431 tmp = header_list->next;
1434 spin_unlock(&sysctl_lock);
1438 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1440 return __sysctl_head_next(current->nsproxy, prev);
1443 void register_sysctl_root(struct ctl_table_root *root)
1445 spin_lock(&sysctl_lock);
1446 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1447 spin_unlock(&sysctl_lock);
1450 #ifdef CONFIG_SYSCTL_SYSCALL
1451 /* Perform the actual read/write of a sysctl table entry. */
1452 static int do_sysctl_strategy(struct ctl_table_root *root,
1453 struct ctl_table *table,
1454 int __user *name, int nlen,
1455 void __user *oldval, size_t __user *oldlenp,
1456 void __user *newval, size_t newlen)
1464 if (sysctl_perm(root, table, op))
1467 if (table->strategy) {
1468 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1476 /* If there is no strategy routine, or if the strategy returns
1477 * zero, proceed with automatic r/w */
1478 if (table->data && table->maxlen) {
1479 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1487 static int parse_table(int __user *name, int nlen,
1488 void __user *oldval, size_t __user *oldlenp,
1489 void __user *newval, size_t newlen,
1490 struct ctl_table_root *root,
1491 struct ctl_table *table)
1497 if (get_user(n, name))
1499 for ( ; table->ctl_name || table->procname; table++) {
1500 if (!table->ctl_name)
1502 if (n == table->ctl_name) {
1505 if (sysctl_perm(root, table, 001))
1509 table = table->child;
1512 error = do_sysctl_strategy(root, table, name, nlen,
1521 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1522 void __user *newval, size_t newlen)
1524 struct ctl_table_header *head;
1525 int error = -ENOTDIR;
1527 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1531 if (!oldlenp || get_user(old_len, oldlenp))
1535 for (head = sysctl_head_next(NULL); head;
1536 head = sysctl_head_next(head)) {
1537 error = parse_table(name, nlen, oldval, oldlenp,
1539 head->root, head->ctl_table);
1540 if (error != -ENOTDIR) {
1541 sysctl_head_finish(head);
1548 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1550 struct __sysctl_args tmp;
1553 if (copy_from_user(&tmp, args, sizeof(tmp)))
1556 error = deprecated_sysctl_warning(&tmp);
1561 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1562 tmp.newval, tmp.newlen);
1567 #endif /* CONFIG_SYSCTL_SYSCALL */
1570 * sysctl_perm does NOT grant the superuser all rights automatically, because
1571 * some sysctl variables are readonly even to root.
1574 static int test_perm(int mode, int op)
1578 else if (in_egroup_p(0))
1580 if ((mode & op & 0007) == op)
1585 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1590 error = security_sysctl(table, op);
1594 if (root->permissions)
1595 mode = root->permissions(root, current->nsproxy, table);
1599 return test_perm(mode, op);
1602 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1604 for (; table->ctl_name || table->procname; table++) {
1605 table->parent = parent;
1607 sysctl_set_parent(table, table->child);
1611 static __init int sysctl_init(void)
1613 sysctl_set_parent(NULL, root_table);
1614 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1617 err = sysctl_check_table(current->nsproxy, root_table);
1623 core_initcall(sysctl_init);
1626 * __register_sysctl_paths - register a sysctl hierarchy
1627 * @root: List of sysctl headers to register on
1628 * @namespaces: Data to compute which lists of sysctl entries are visible
1629 * @path: The path to the directory the sysctl table is in.
1630 * @table: the top-level table structure
1632 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1633 * array. A completely 0 filled entry terminates the table.
1635 * The members of the &struct ctl_table structure are used as follows:
1637 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1638 * must be unique within that level of sysctl
1640 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1641 * enter a sysctl file
1643 * data - a pointer to data for use by proc_handler
1645 * maxlen - the maximum size in bytes of the data
1647 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1649 * child - a pointer to the child sysctl table if this entry is a directory, or
1652 * proc_handler - the text handler routine (described below)
1654 * strategy - the strategy routine (described below)
1656 * de - for internal use by the sysctl routines
1658 * extra1, extra2 - extra pointers usable by the proc handler routines
1660 * Leaf nodes in the sysctl tree will be represented by a single file
1661 * under /proc; non-leaf nodes will be represented by directories.
1663 * sysctl(2) can automatically manage read and write requests through
1664 * the sysctl table. The data and maxlen fields of the ctl_table
1665 * struct enable minimal validation of the values being written to be
1666 * performed, and the mode field allows minimal authentication.
1668 * More sophisticated management can be enabled by the provision of a
1669 * strategy routine with the table entry. This will be called before
1670 * any automatic read or write of the data is performed.
1672 * The strategy routine may return
1674 * < 0 - Error occurred (error is passed to user process)
1676 * 0 - OK - proceed with automatic read or write.
1678 * > 0 - OK - read or write has been done by the strategy routine, so
1679 * return immediately.
1681 * There must be a proc_handler routine for any terminal nodes
1682 * mirrored under /proc/sys (non-terminals are handled by a built-in
1683 * directory handler). Several default handlers are available to
1684 * cover common cases -
1686 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1687 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1688 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1690 * It is the handler's job to read the input buffer from user memory
1691 * and process it. The handler should return 0 on success.
1693 * This routine returns %NULL on a failure to register, and a pointer
1694 * to the table header on success.
1696 struct ctl_table_header *__register_sysctl_paths(
1697 struct ctl_table_root *root,
1698 struct nsproxy *namespaces,
1699 const struct ctl_path *path, struct ctl_table *table)
1701 struct list_head *header_list;
1702 struct ctl_table_header *header;
1703 struct ctl_table *new, **prevp;
1704 unsigned int n, npath;
1706 /* Count the path components */
1707 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1711 * For each path component, allocate a 2-element ctl_table array.
1712 * The first array element will be filled with the sysctl entry
1713 * for this, the second will be the sentinel (ctl_name == 0).
1715 * We allocate everything in one go so that we don't have to
1716 * worry about freeing additional memory in unregister_sysctl_table.
1718 header = kzalloc(sizeof(struct ctl_table_header) +
1719 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1723 new = (struct ctl_table *) (header + 1);
1725 /* Now connect the dots */
1726 prevp = &header->ctl_table;
1727 for (n = 0; n < npath; ++n, ++path) {
1728 /* Copy the procname */
1729 new->procname = path->procname;
1730 new->ctl_name = path->ctl_name;
1734 prevp = &new->child;
1739 header->ctl_table_arg = table;
1741 INIT_LIST_HEAD(&header->ctl_entry);
1743 header->unregistering = NULL;
1744 header->root = root;
1745 sysctl_set_parent(NULL, header->ctl_table);
1746 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1747 if (sysctl_check_table(namespaces, header->ctl_table)) {
1752 spin_lock(&sysctl_lock);
1753 header_list = lookup_header_list(root, namespaces);
1754 list_add_tail(&header->ctl_entry, header_list);
1755 spin_unlock(&sysctl_lock);
1761 * register_sysctl_table_path - register a sysctl table hierarchy
1762 * @path: The path to the directory the sysctl table is in.
1763 * @table: the top-level table structure
1765 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1766 * array. A completely 0 filled entry terminates the table.
1768 * See __register_sysctl_paths for more details.
1770 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1771 struct ctl_table *table)
1773 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1778 * register_sysctl_table - register a sysctl table hierarchy
1779 * @table: the top-level table structure
1781 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1782 * array. A completely 0 filled entry terminates the table.
1784 * See register_sysctl_paths for more details.
1786 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1788 static const struct ctl_path null_path[] = { {} };
1790 return register_sysctl_paths(null_path, table);
1794 * unregister_sysctl_table - unregister a sysctl table hierarchy
1795 * @header: the header returned from register_sysctl_table
1797 * Unregisters the sysctl table and all children. proc entries may not
1798 * actually be removed until they are no longer used by anyone.
1800 void unregister_sysctl_table(struct ctl_table_header * header)
1807 spin_lock(&sysctl_lock);
1808 start_unregistering(header);
1809 spin_unlock(&sysctl_lock);
1813 #else /* !CONFIG_SYSCTL */
1814 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1819 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1820 struct ctl_table *table)
1825 void unregister_sysctl_table(struct ctl_table_header * table)
1829 #endif /* CONFIG_SYSCTL */
1835 #ifdef CONFIG_PROC_SYSCTL
1837 static int _proc_do_string(void* data, int maxlen, int write,
1838 struct file *filp, void __user *buffer,
1839 size_t *lenp, loff_t *ppos)
1845 if (!data || !maxlen || !*lenp) {
1853 while (len < *lenp) {
1854 if (get_user(c, p++))
1856 if (c == 0 || c == '\n')
1862 if(copy_from_user(data, buffer, len))
1864 ((char *) data)[len] = 0;
1882 if(copy_to_user(buffer, data, len))
1885 if(put_user('\n', ((char __user *) buffer) + len))
1896 * proc_dostring - read a string sysctl
1897 * @table: the sysctl table
1898 * @write: %TRUE if this is a write to the sysctl file
1899 * @filp: the file structure
1900 * @buffer: the user buffer
1901 * @lenp: the size of the user buffer
1902 * @ppos: file position
1904 * Reads/writes a string from/to the user buffer. If the kernel
1905 * buffer provided is not large enough to hold the string, the
1906 * string is truncated. The copied string is %NULL-terminated.
1907 * If the string is being read by the user process, it is copied
1908 * and a newline '\n' is added. It is truncated if the buffer is
1911 * Returns 0 on success.
1913 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1914 void __user *buffer, size_t *lenp, loff_t *ppos)
1916 return _proc_do_string(table->data, table->maxlen, write, filp,
1917 buffer, lenp, ppos);
1921 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1923 int write, void *data)
1926 *valp = *negp ? -*lvalp : *lvalp;
1931 *lvalp = (unsigned long)-val;
1934 *lvalp = (unsigned long)val;
1940 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1941 int write, struct file *filp, void __user *buffer,
1942 size_t *lenp, loff_t *ppos,
1943 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1944 int write, void *data),
1947 #define TMPBUFLEN 21
1948 int *i, vleft, first=1, neg, val;
1952 char buf[TMPBUFLEN], *p;
1953 char __user *s = buffer;
1955 if (!tbl_data || !table->maxlen || !*lenp ||
1956 (*ppos && !write)) {
1961 i = (int *) tbl_data;
1962 vleft = table->maxlen / sizeof(*i);
1966 conv = do_proc_dointvec_conv;
1968 for (; left && vleft--; i++, first=0) {
1983 if (len > sizeof(buf) - 1)
1984 len = sizeof(buf) - 1;
1985 if (copy_from_user(buf, s, len))
1989 if (*p == '-' && left > 1) {
1993 if (*p < '0' || *p > '9')
1996 lval = simple_strtoul(p, &p, 0);
1999 if ((len < left) && *p && !isspace(*p))
2006 if (conv(&neg, &lval, i, 1, data))
2013 if (conv(&neg, &lval, i, 0, data))
2016 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2020 if(copy_to_user(s, buf, len))
2027 if (!write && !first && left) {
2028 if(put_user('\n', s))
2035 if (get_user(c, s++))
2050 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2051 void __user *buffer, size_t *lenp, loff_t *ppos,
2052 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2053 int write, void *data),
2056 return __do_proc_dointvec(table->data, table, write, filp,
2057 buffer, lenp, ppos, conv, data);
2061 * proc_dointvec - read a vector of integers
2062 * @table: the sysctl table
2063 * @write: %TRUE if this is a write to the sysctl file
2064 * @filp: the file structure
2065 * @buffer: the user buffer
2066 * @lenp: the size of the user buffer
2067 * @ppos: file position
2069 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2070 * values from/to the user buffer, treated as an ASCII string.
2072 * Returns 0 on success.
2074 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2075 void __user *buffer, size_t *lenp, loff_t *ppos)
2077 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2085 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2087 int write, void *data)
2089 int op = *(int *)data;
2091 int val = *negp ? -*lvalp : *lvalp;
2093 case OP_SET: *valp = val; break;
2094 case OP_AND: *valp &= val; break;
2095 case OP_OR: *valp |= val; break;
2101 *lvalp = (unsigned long)-val;
2104 *lvalp = (unsigned long)val;
2111 * Taint values can only be increased
2113 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2114 void __user *buffer, size_t *lenp, loff_t *ppos)
2118 if (write && !capable(CAP_SYS_ADMIN))
2122 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2123 do_proc_dointvec_bset_conv,&op);
2126 struct do_proc_dointvec_minmax_conv_param {
2131 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2133 int write, void *data)
2135 struct do_proc_dointvec_minmax_conv_param *param = data;
2137 int val = *negp ? -*lvalp : *lvalp;
2138 if ((param->min && *param->min > val) ||
2139 (param->max && *param->max < val))
2146 *lvalp = (unsigned long)-val;
2149 *lvalp = (unsigned long)val;
2156 * proc_dointvec_minmax - read a vector of integers with min/max values
2157 * @table: the sysctl table
2158 * @write: %TRUE if this is a write to the sysctl file
2159 * @filp: the file structure
2160 * @buffer: the user buffer
2161 * @lenp: the size of the user buffer
2162 * @ppos: file position
2164 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2165 * values from/to the user buffer, treated as an ASCII string.
2167 * This routine will ensure the values are within the range specified by
2168 * table->extra1 (min) and table->extra2 (max).
2170 * Returns 0 on success.
2172 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2173 void __user *buffer, size_t *lenp, loff_t *ppos)
2175 struct do_proc_dointvec_minmax_conv_param param = {
2176 .min = (int *) table->extra1,
2177 .max = (int *) table->extra2,
2179 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2180 do_proc_dointvec_minmax_conv, ¶m);
2183 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2185 void __user *buffer,
2186 size_t *lenp, loff_t *ppos,
2187 unsigned long convmul,
2188 unsigned long convdiv)
2190 #define TMPBUFLEN 21
2191 unsigned long *i, *min, *max, val;
2192 int vleft, first=1, neg;
2194 char buf[TMPBUFLEN], *p;
2195 char __user *s = buffer;
2197 if (!data || !table->maxlen || !*lenp ||
2198 (*ppos && !write)) {
2203 i = (unsigned long *) data;
2204 min = (unsigned long *) table->extra1;
2205 max = (unsigned long *) table->extra2;
2206 vleft = table->maxlen / sizeof(unsigned long);
2209 for (; left && vleft--; i++, min++, max++, first=0) {
2224 if (len > TMPBUFLEN-1)
2226 if (copy_from_user(buf, s, len))
2230 if (*p == '-' && left > 1) {
2234 if (*p < '0' || *p > '9')
2236 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2238 if ((len < left) && *p && !isspace(*p))
2247 if ((min && val < *min) || (max && val > *max))
2254 sprintf(p, "%lu", convdiv * (*i) / convmul);
2258 if(copy_to_user(s, buf, len))
2265 if (!write && !first && left) {
2266 if(put_user('\n', s))
2273 if (get_user(c, s++))
2288 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2290 void __user *buffer,
2291 size_t *lenp, loff_t *ppos,
2292 unsigned long convmul,
2293 unsigned long convdiv)
2295 return __do_proc_doulongvec_minmax(table->data, table, write,
2296 filp, buffer, lenp, ppos, convmul, convdiv);
2300 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2301 * @table: the sysctl table
2302 * @write: %TRUE if this is a write to the sysctl file
2303 * @filp: the file structure
2304 * @buffer: the user buffer
2305 * @lenp: the size of the user buffer
2306 * @ppos: file position
2308 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2309 * values from/to the user buffer, treated as an ASCII string.
2311 * This routine will ensure the values are within the range specified by
2312 * table->extra1 (min) and table->extra2 (max).
2314 * Returns 0 on success.
2316 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2317 void __user *buffer, size_t *lenp, loff_t *ppos)
2319 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2323 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2324 * @table: the sysctl table
2325 * @write: %TRUE if this is a write to the sysctl file
2326 * @filp: the file structure
2327 * @buffer: the user buffer
2328 * @lenp: the size of the user buffer
2329 * @ppos: file position
2331 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2332 * values from/to the user buffer, treated as an ASCII string. The values
2333 * are treated as milliseconds, and converted to jiffies when they are stored.
2335 * This routine will ensure the values are within the range specified by
2336 * table->extra1 (min) and table->extra2 (max).
2338 * Returns 0 on success.
2340 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2342 void __user *buffer,
2343 size_t *lenp, loff_t *ppos)
2345 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2346 lenp, ppos, HZ, 1000l);
2350 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2352 int write, void *data)
2355 if (*lvalp > LONG_MAX / HZ)
2357 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2363 lval = (unsigned long)-val;
2366 lval = (unsigned long)val;
2373 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2375 int write, void *data)
2378 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2380 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2386 lval = (unsigned long)-val;
2389 lval = (unsigned long)val;
2391 *lvalp = jiffies_to_clock_t(lval);
2396 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2398 int write, void *data)
2401 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2407 lval = (unsigned long)-val;
2410 lval = (unsigned long)val;
2412 *lvalp = jiffies_to_msecs(lval);
2418 * proc_dointvec_jiffies - read a vector of integers as seconds
2419 * @table: the sysctl table
2420 * @write: %TRUE if this is a write to the sysctl file
2421 * @filp: the file structure
2422 * @buffer: the user buffer
2423 * @lenp: the size of the user buffer
2424 * @ppos: file position
2426 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2427 * values from/to the user buffer, treated as an ASCII string.
2428 * The values read are assumed to be in seconds, and are converted into
2431 * Returns 0 on success.
2433 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2434 void __user *buffer, size_t *lenp, loff_t *ppos)
2436 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2437 do_proc_dointvec_jiffies_conv,NULL);
2441 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2442 * @table: the sysctl table
2443 * @write: %TRUE if this is a write to the sysctl file
2444 * @filp: the file structure
2445 * @buffer: the user buffer
2446 * @lenp: the size of the user buffer
2447 * @ppos: pointer to the file position
2449 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2450 * values from/to the user buffer, treated as an ASCII string.
2451 * The values read are assumed to be in 1/USER_HZ seconds, and
2452 * are converted into jiffies.
2454 * Returns 0 on success.
2456 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2459 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2460 do_proc_dointvec_userhz_jiffies_conv,NULL);
2464 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2465 * @table: the sysctl table
2466 * @write: %TRUE if this is a write to the sysctl file
2467 * @filp: the file structure
2468 * @buffer: the user buffer
2469 * @lenp: the size of the user buffer
2470 * @ppos: file position
2471 * @ppos: the current position in the file
2473 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2474 * values from/to the user buffer, treated as an ASCII string.
2475 * The values read are assumed to be in 1/1000 seconds, and
2476 * are converted into jiffies.
2478 * Returns 0 on success.
2480 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2483 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2484 do_proc_dointvec_ms_jiffies_conv, NULL);
2487 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2488 void __user *buffer, size_t *lenp, loff_t *ppos)
2490 struct pid *new_pid;
2494 tmp = pid_vnr(cad_pid);
2496 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2497 lenp, ppos, NULL, NULL);
2501 new_pid = find_get_pid(tmp);
2505 put_pid(xchg(&cad_pid, new_pid));
2509 #else /* CONFIG_PROC_FS */
2511 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2512 void __user *buffer, size_t *lenp, loff_t *ppos)
2517 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2518 void __user *buffer, size_t *lenp, loff_t *ppos)
2523 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2524 void __user *buffer, size_t *lenp, loff_t *ppos)
2529 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2530 void __user *buffer, size_t *lenp, loff_t *ppos)
2535 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2536 void __user *buffer, size_t *lenp, loff_t *ppos)
2541 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2542 void __user *buffer, size_t *lenp, loff_t *ppos)
2547 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2548 void __user *buffer, size_t *lenp, loff_t *ppos)
2553 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2555 void __user *buffer,
2556 size_t *lenp, loff_t *ppos)
2562 #endif /* CONFIG_PROC_FS */
2565 #ifdef CONFIG_SYSCTL_SYSCALL
2567 * General sysctl support routines
2570 /* The generic sysctl data routine (used if no strategy routine supplied) */
2571 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2572 void __user *oldval, size_t __user *oldlenp,
2573 void __user *newval, size_t newlen)
2577 /* Get out of I don't have a variable */
2578 if (!table->data || !table->maxlen)
2581 if (oldval && oldlenp) {
2582 if (get_user(len, oldlenp))
2585 if (len > table->maxlen)
2586 len = table->maxlen;
2587 if (copy_to_user(oldval, table->data, len))
2589 if (put_user(len, oldlenp))
2594 if (newval && newlen) {
2595 if (newlen > table->maxlen)
2596 newlen = table->maxlen;
2598 if (copy_from_user(table->data, newval, newlen))
2604 /* The generic string strategy routine: */
2605 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2606 void __user *oldval, size_t __user *oldlenp,
2607 void __user *newval, size_t newlen)
2609 if (!table->data || !table->maxlen)
2612 if (oldval && oldlenp) {
2614 if (get_user(bufsize, oldlenp))
2617 size_t len = strlen(table->data), copied;
2619 /* This shouldn't trigger for a well-formed sysctl */
2620 if (len > table->maxlen)
2621 len = table->maxlen;
2623 /* Copy up to a max of bufsize-1 bytes of the string */
2624 copied = (len >= bufsize) ? bufsize - 1 : len;
2626 if (copy_to_user(oldval, table->data, copied) ||
2627 put_user(0, (char __user *)(oldval + copied)))
2629 if (put_user(len, oldlenp))
2633 if (newval && newlen) {
2634 size_t len = newlen;
2635 if (len > table->maxlen)
2636 len = table->maxlen;
2637 if(copy_from_user(table->data, newval, len))
2639 if (len == table->maxlen)
2641 ((char *) table->data)[len] = 0;
2647 * This function makes sure that all of the integers in the vector
2648 * are between the minimum and maximum values given in the arrays
2649 * table->extra1 and table->extra2, respectively.
2651 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2652 void __user *oldval, size_t __user *oldlenp,
2653 void __user *newval, size_t newlen)
2656 if (newval && newlen) {
2657 int __user *vec = (int __user *) newval;
2658 int *min = (int *) table->extra1;
2659 int *max = (int *) table->extra2;
2663 if (newlen % sizeof(int) != 0)
2666 if (!table->extra1 && !table->extra2)
2669 if (newlen > table->maxlen)
2670 newlen = table->maxlen;
2671 length = newlen / sizeof(int);
2673 for (i = 0; i < length; i++) {
2675 if (get_user(value, vec + i))
2677 if (min && value < min[i])
2679 if (max && value > max[i])
2686 /* Strategy function to convert jiffies to seconds */
2687 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2688 void __user *oldval, size_t __user *oldlenp,
2689 void __user *newval, size_t newlen)
2691 if (oldval && oldlenp) {
2694 if (get_user(olen, oldlenp))
2699 if (olen < sizeof(int))
2702 val = *(int *)(table->data) / HZ;
2703 if (put_user(val, (int __user *)oldval))
2705 if (put_user(sizeof(int), oldlenp))
2709 if (newval && newlen) {
2711 if (newlen != sizeof(int))
2713 if (get_user(new, (int __user *)newval))
2715 *(int *)(table->data) = new*HZ;
2720 /* Strategy function to convert jiffies to seconds */
2721 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2722 void __user *oldval, size_t __user *oldlenp,
2723 void __user *newval, size_t newlen)
2725 if (oldval && oldlenp) {
2728 if (get_user(olen, oldlenp))
2733 if (olen < sizeof(int))
2736 val = jiffies_to_msecs(*(int *)(table->data));
2737 if (put_user(val, (int __user *)oldval))
2739 if (put_user(sizeof(int), oldlenp))
2743 if (newval && newlen) {
2745 if (newlen != sizeof(int))
2747 if (get_user(new, (int __user *)newval))
2749 *(int *)(table->data) = msecs_to_jiffies(new);
2756 #else /* CONFIG_SYSCTL_SYSCALL */
2759 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2761 struct __sysctl_args tmp;
2764 if (copy_from_user(&tmp, args, sizeof(tmp)))
2767 error = deprecated_sysctl_warning(&tmp);
2769 /* If no error reading the parameters then just -ENOSYS ... */
2776 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2777 void __user *oldval, size_t __user *oldlenp,
2778 void __user *newval, size_t newlen)
2783 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2784 void __user *oldval, size_t __user *oldlenp,
2785 void __user *newval, size_t newlen)
2790 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2791 void __user *oldval, size_t __user *oldlenp,
2792 void __user *newval, size_t newlen)
2797 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2798 void __user *oldval, size_t __user *oldlenp,
2799 void __user *newval, size_t newlen)
2804 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2805 void __user *oldval, size_t __user *oldlenp,
2806 void __user *newval, size_t newlen)
2811 #endif /* CONFIG_SYSCTL_SYSCALL */
2813 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2815 static int msg_count;
2816 int name[CTL_MAXNAME];
2819 /* Check args->nlen. */
2820 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2823 /* Read in the sysctl name for better debug message logging */
2824 for (i = 0; i < args->nlen; i++)
2825 if (get_user(name[i], args->name + i))
2828 /* Ignore accesses to kernel.version */
2829 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2832 if (msg_count < 5) {
2835 "warning: process `%s' used the deprecated sysctl "
2836 "system call with ", current->comm);
2837 for (i = 0; i < args->nlen; i++)
2838 printk("%d.", name[i]);
2845 * No sense putting this after each symbol definition, twice,
2846 * exception granted :-)
2848 EXPORT_SYMBOL(proc_dointvec);
2849 EXPORT_SYMBOL(proc_dointvec_jiffies);
2850 EXPORT_SYMBOL(proc_dointvec_minmax);
2851 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2852 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2853 EXPORT_SYMBOL(proc_dostring);
2854 EXPORT_SYMBOL(proc_doulongvec_minmax);
2855 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2856 EXPORT_SYMBOL(register_sysctl_table);
2857 EXPORT_SYMBOL(register_sysctl_paths);
2858 EXPORT_SYMBOL(sysctl_intvec);
2859 EXPORT_SYMBOL(sysctl_jiffies);
2860 EXPORT_SYMBOL(sysctl_ms_jiffies);
2861 EXPORT_SYMBOL(sysctl_string);
2862 EXPORT_SYMBOL(sysctl_data);
2863 EXPORT_SYMBOL(unregister_sysctl_table);