Add build option to to set the default panic timeout.
[linux-2.6.git] / kernel / sysctl.c
index 4cb1525..fd15163 100644 (file)
@@ -56,6 +56,7 @@
 #include <linux/kprobes.h>
 #include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
+#include <linux/kmod.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -95,6 +96,7 @@ extern char core_pattern[];
 extern unsigned int core_pipe_limit;
 extern int pid_max;
 extern int min_free_kbytes;
+extern int min_free_order_shift;
 extern int pid_max_min, pid_max_max;
 extern int sysctl_drop_caches;
 extern int percpu_pagelist_fraction;
@@ -117,6 +119,7 @@ static int neg_one = -1;
 static int zero;
 static int __maybe_unused one = 1;
 static int __maybe_unused two = 2;
+static int __maybe_unused three = 3;
 static unsigned long one_ul = 1;
 static int one_hundred = 100;
 #ifdef CONFIG_PRINTK
@@ -169,6 +172,11 @@ static int proc_taint(struct ctl_table *table, int write,
                               void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
+#ifdef CONFIG_PRINTK
+static int proc_dmesg_restrict(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif
+
 #ifdef CONFIG_MAGIC_SYSRQ
 /* Note: sysrq code uses it's own private copy */
 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
@@ -361,20 +369,13 @@ static struct ctl_table kern_table[] = {
                .mode           = 0644,
                .proc_handler   = sched_rt_handler,
        },
-       {
-               .procname       = "sched_compat_yield",
-               .data           = &sysctl_sched_compat_yield,
-               .maxlen         = sizeof(unsigned int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec,
-       },
 #ifdef CONFIG_SCHED_AUTOGROUP
        {
                .procname       = "sched_autogroup_enabled",
                .data           = &sysctl_sched_autogroup_enabled,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
                .extra1         = &zero,
                .extra2         = &one,
        },
@@ -617,6 +618,11 @@ static struct ctl_table kern_table[] = {
                .child          = random_table,
        },
        {
+               .procname       = "usermodehelper",
+               .mode           = 0555,
+               .child          = usermodehelper_table,
+       },
+       {
                .procname       = "overflowuid",
                .data           = &overflowuid,
                .maxlen         = sizeof(int),
@@ -713,7 +719,7 @@ static struct ctl_table kern_table[] = {
                .data           = &kptr_restrict,
                .maxlen         = sizeof(int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec_minmax,
+               .proc_handler   = proc_dmesg_restrict,
                .extra1         = &zero,
                .extra2         = &two,
        },
@@ -731,14 +737,16 @@ static struct ctl_table kern_table[] = {
                .data           = &watchdog_enabled,
                .maxlen         = sizeof (int),
                .mode           = 0644,
-               .proc_handler   = proc_dowatchdog_enabled,
+               .proc_handler   = proc_dowatchdog,
+               .extra1         = &zero,
+               .extra2         = &one,
        },
        {
                .procname       = "watchdog_thresh",
-               .data           = &softlockup_thresh,
+               .data           = &watchdog_thresh,
                .maxlen         = sizeof(int),
                .mode           = 0644,
-               .proc_handler   = proc_dowatchdog_thresh,
+               .proc_handler   = proc_dowatchdog,
                .extra1         = &neg_one,
                .extra2         = &sixty,
        },
@@ -756,7 +764,9 @@ static struct ctl_table kern_table[] = {
                .data           = &watchdog_enabled,
                .maxlen         = sizeof (int),
                .mode           = 0644,
-               .proc_handler   = proc_dowatchdog_enabled,
+               .proc_handler   = proc_dowatchdog,
+               .extra1         = &zero,
+               .extra2         = &one,
        },
 #endif
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
@@ -929,6 +939,12 @@ static struct ctl_table kern_table[] = {
        },
 #endif
 #ifdef CONFIG_PERF_EVENTS
+       /*
+        * User-space scripts rely on the existence of this file
+        * as a feature check for perf_events being enabled.
+        *
+        * So it's an ABI, do not remove!
+        */
        {
                .procname       = "perf_event_paranoid",
                .data           = &sysctl_perf_event_paranoid,
@@ -948,7 +964,7 @@ static struct ctl_table kern_table[] = {
                .data           = &sysctl_perf_event_sample_rate,
                .maxlen         = sizeof(sysctl_perf_event_sample_rate),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = perf_proc_update_handler,
        },
 #endif
 #ifdef CONFIG_KMEMCHECK
@@ -978,14 +994,18 @@ static struct ctl_table vm_table[] = {
                .data           = &sysctl_overcommit_memory,
                .maxlen         = sizeof(sysctl_overcommit_memory),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &two,
        },
        {
                .procname       = "panic_on_oom",
                .data           = &sysctl_panic_on_oom,
                .maxlen         = sizeof(sysctl_panic_on_oom),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &two,
        },
        {
                .procname       = "oom_kill_allocating_task",
@@ -1013,7 +1033,8 @@ static struct ctl_table vm_table[] = {
                .data           = &page_cluster,
                .maxlen         = sizeof(int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
        {
                .procname       = "dirty_background_ratio",
@@ -1061,7 +1082,8 @@ static struct ctl_table vm_table[] = {
                .data           = &dirty_expire_interval,
                .maxlen         = sizeof(dirty_expire_interval),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
        },
        {
                .procname       = "nr_pdflush_threads",
@@ -1137,6 +1159,8 @@ static struct ctl_table vm_table[] = {
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = drop_caches_sysctl_handler,
+               .extra1         = &one,
+               .extra2         = &three,
        },
 #ifdef CONFIG_COMPACTION
        {
@@ -1166,6 +1190,13 @@ static struct ctl_table vm_table[] = {
                .extra1         = &zero,
        },
        {
+               .procname       = "min_free_order_shift",
+               .data           = &min_free_order_shift,
+               .maxlen         = sizeof(min_free_order_shift),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec
+       },
+       {
                .procname       = "percpu_pagelist_fraction",
                .data           = &percpu_pagelist_fraction,
                .maxlen         = sizeof(percpu_pagelist_fraction),
@@ -1489,7 +1520,7 @@ static struct ctl_table fs_table[] = {
 
 static struct ctl_table debug_table[] = {
 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
-    defined(CONFIG_S390)
+    defined(CONFIG_S390) || defined(CONFIG_TILE)
        {
                .procname       = "exception-trace",
                .data           = &show_unhandled_signals,
@@ -1567,16 +1598,11 @@ void sysctl_head_get(struct ctl_table_header *head)
        spin_unlock(&sysctl_lock);
 }
 
-static void free_head(struct rcu_head *rcu)
-{
-       kfree(container_of(rcu, struct ctl_table_header, rcu));
-}
-
 void sysctl_head_put(struct ctl_table_header *head)
 {
        spin_lock(&sysctl_lock);
        if (!--head->count)
-               call_rcu(&head->rcu, free_head);
+               kfree_rcu(head, rcu);
        spin_unlock(&sysctl_lock);
 }
 
@@ -1948,10 +1974,10 @@ void unregister_sysctl_table(struct ctl_table_header * header)
        start_unregistering(header);
        if (!--header->parent->count) {
                WARN_ON(1);
-               call_rcu(&header->parent->rcu, free_head);
+               kfree_rcu(header->parent, rcu);
        }
        if (!--header->count)
-               call_rcu(&header->rcu, free_head);
+               kfree_rcu(header, rcu);
        spin_unlock(&sysctl_lock);
 }
 
@@ -2392,6 +2418,17 @@ static int proc_taint(struct ctl_table *table, int write,
        return err;
 }
 
+#ifdef CONFIG_PRINTK
+static int proc_dmesg_restrict(struct ctl_table *table, int write,
+                               void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       if (write && !capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
+       return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+#endif
+
 struct do_proc_dointvec_minmax_conv_param {
        int *min;
        int *max;