static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
+ local_irq_enable();
machine_restart(NULL);
}
/* END SIGNAL SYSRQ HANDLERS BLOCK */
+static void sysrq_handle_unrt(int key, struct pt_regs *pt_regs,
+ struct tty_struct *tty)
+{
+ normalize_rt_tasks();
+}
+static struct sysrq_key_op sysrq_unrt_op = {
+ .handler = sysrq_handle_unrt,
+ .help_msg = "Nice",
+ .action_msg = "Nice All RT Tasks"
+};
/* Key Operations table and lock */
-static spinlock_t sysrq_key_table_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(sysrq_key_table_lock);
#define SYSRQ_KEY_TABLE_LENGTH 36
static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
/* 0 */ &sysrq_loglevel_op,
#endif
/* l */ NULL,
/* m */ &sysrq_showmem_op,
-/* n */ NULL,
+/* n */ &sysrq_unrt_op,
/* o */ NULL, /* This will often be registered
as 'Off' at init time */
/* p */ &sysrq_showregs_op,
return retval;
}
-/*
- * table lock and unlocking functions, exposed to modules
- */
-
-void __sysrq_lock_table (void) { spin_lock(&sysrq_key_table_lock); }
-
-void __sysrq_unlock_table (void) { spin_unlock(&sysrq_key_table_lock); }
-
/*
* get and put functions for the table, exposed to modules.
*/
struct sysrq_key_op *op_p;
int orig_log_level;
int i, j;
+ unsigned long flags;
- __sysrq_lock_table();
+ spin_lock_irqsave(&sysrq_key_table_lock, flags);
orig_log_level = console_loglevel;
console_loglevel = 7;
printk(KERN_INFO "SysRq : ");
printk ("\n");
console_loglevel = orig_log_level;
}
- __sysrq_unlock_table();
+ spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
}
/*
__handle_sysrq(key, pt_regs, tty);
}
+int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
+ struct sysrq_key_op *remove_op_p) {
+
+ int retval;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sysrq_key_table_lock, flags);
+ if (__sysrq_get_key_op(key) == remove_op_p) {
+ __sysrq_put_key_op(key, insert_op_p);
+ retval = 0;
+ } else {
+ retval = -1;
+ }
+ spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+
+ return retval;
+}
+
+int register_sysrq_key(int key, struct sysrq_key_op *op_p)
+{
+ return __sysrq_swap_key_ops(key, op_p, NULL);
+}
+
+int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
+{
+ return __sysrq_swap_key_ops(key, NULL, op_p);
+}
+
EXPORT_SYMBOL(handle_sysrq);
-EXPORT_SYMBOL(__sysrq_lock_table);
-EXPORT_SYMBOL(__sysrq_unlock_table);
-EXPORT_SYMBOL(__sysrq_get_key_op);
-EXPORT_SYMBOL(__sysrq_put_key_op);
+EXPORT_SYMBOL(register_sysrq_key);
+EXPORT_SYMBOL(unregister_sysrq_key);