reboot: move shutdown/reboot related functions to kernel/reboot.c

This patch is preparatory.  It moves reboot related syscall, etc
functions from kernel/sys.c to kernel/reboot.c.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 331 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index b882440bd0c0..771129b299f8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -116,20 +116,6 @@ EXPORT_SYMBOL(fs_overflowuid);
 EXPORT_SYMBOL(fs_overflowgid);
 
 /*
- * this indicates whether you can reboot with ctrl-alt-del: the default is yes
- */
-
-int C_A_D = 1;
-struct pid *cad_pid;
-EXPORT_SYMBOL(cad_pid);
-
-/*
- * If set, this is used for preparing the system to power off.
- */
-
-void (*pm_power_off_prepare)(void);
-
-/*
  * Returns true if current's euid is same as p's uid or euid,
  * or has CAP_SYS_NICE to p's user_ns.
  *
@@ -308,261 +294,6 @@ out_unlock:
         return retval;
 }
 
-/**
- *      emergency_restart - reboot the system
- *
- *      Without shutting down any hardware or taking any locks
- *      reboot the system.  This is called when we know we are in
- *      trouble so this is our best effort to reboot.  This is
- *      safe to call in interrupt context.
- */
-void emergency_restart(void)
-{
-        kmsg_dump(KMSG_DUMP_EMERG);
-        machine_emergency_restart();
-}
-EXPORT_SYMBOL_GPL(emergency_restart);
-
-void kernel_restart_prepare(char *cmd)
-{
-        blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
-        system_state = SYSTEM_RESTART;
-        usermodehelper_disable();
-        device_shutdown();
-}
-
-/**
- *      register_reboot_notifier - Register function to be called at reboot time
- *      @nb: Info about notifier function to be called
- *
- *      Registers a function with the list of functions
- *      to be called at reboot time.
- *
- *      Currently always returns zero, as blocking_notifier_chain_register()
- *      always returns zero.
- */
-int register_reboot_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_register(&reboot_notifier_list, nb);
-}
-EXPORT_SYMBOL(register_reboot_notifier);
-
-/**
- *      unregister_reboot_notifier - Unregister previously registered reboot notifier
- *      @nb: Hook to be unregistered
- *
- *      Unregisters a previously registered reboot
- *      notifier function.
- *
- *      Returns zero on success, or %-ENOENT on failure.
- */
-int unregister_reboot_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
-}
-EXPORT_SYMBOL(unregister_reboot_notifier);
-
-static void migrate_to_reboot_cpu(void)
-{
-        /* The boot cpu is always logical cpu 0 */
-        int cpu = 0;
-
-        cpu_hotplug_disable();
-
-        /* Make certain the cpu I'm about to reboot on is online */
-        if (!cpu_online(cpu))
-                cpu = cpumask_first(cpu_online_mask);
-
-        /* Prevent races with other tasks migrating this task */
-        current->flags |= PF_NO_SETAFFINITY;
-
-        /* Make certain I only run on the appropriate processor */
-        set_cpus_allowed_ptr(current, cpumask_of(cpu));
-}
-
-/**
- *      kernel_restart - reboot the system
- *      @cmd: pointer to buffer containing command to execute for restart
- *              or %NULL
- *
- *      Shutdown everything and perform a clean reboot.
- *      This is not safe to call in interrupt context.
- */
-void kernel_restart(char *cmd)
-{
-        kernel_restart_prepare(cmd);
-        migrate_to_reboot_cpu();
-        syscore_shutdown();
-        if (!cmd)
-                printk(KERN_EMERG "Restarting system.\n");
-        else
-                printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
-        kmsg_dump(KMSG_DUMP_RESTART);
-        machine_restart(cmd);
-}
-EXPORT_SYMBOL_GPL(kernel_restart);
-
-static void kernel_shutdown_prepare(enum system_states state)
-{
-        blocking_notifier_call_chain(&reboot_notifier_list,
-                (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
-        system_state = state;
-        usermodehelper_disable();
-        device_shutdown();
-}
-/**
- *      kernel_halt - halt the system
- *
- *      Shutdown everything and perform a clean system halt.
- */
-void kernel_halt(void)
-{
-        kernel_shutdown_prepare(SYSTEM_HALT);
-        migrate_to_reboot_cpu();
-        syscore_shutdown();
-        printk(KERN_EMERG "System halted.\n");
-        kmsg_dump(KMSG_DUMP_HALT);
-        machine_halt();
-}
-
-EXPORT_SYMBOL_GPL(kernel_halt);
-
-/**
- *      kernel_power_off - power_off the system
- *
- *      Shutdown everything and perform a clean system power_off.
- */
-void kernel_power_off(void)
-{
-        kernel_shutdown_prepare(SYSTEM_POWER_OFF);
-        if (pm_power_off_prepare)
-                pm_power_off_prepare();
-        migrate_to_reboot_cpu();
-        syscore_shutdown();
-        printk(KERN_EMERG "Power down.\n");
-        kmsg_dump(KMSG_DUMP_POWEROFF);
-        machine_power_off();
-}
-EXPORT_SYMBOL_GPL(kernel_power_off);
-
-static DEFINE_MUTEX(reboot_mutex);
-
-/*
- * Reboot system call: for obvious reasons only root may call it,
- * and even root needs to set up some magic numbers in the registers
- * so that some mistake won't make this reboot the whole machine.
- * You can also set the meaning of the ctrl-alt-del-key here.
- *
- * reboot doesn't sync: do that yourself before calling this.
- */
-SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
-                void __user *, arg)
-{
-        struct pid_namespace *pid_ns = task_active_pid_ns(current);
-        char buffer[256];
-        int ret = 0;
-
-        /* We only trust the superuser with rebooting the system. */
-        if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
-                return -EPERM;
-
-        /* For safety, we require "magic" arguments. */
-        if (magic1 != LINUX_REBOOT_MAGIC1 ||
-            (magic2 != LINUX_REBOOT_MAGIC2 &&
-                        magic2 != LINUX_REBOOT_MAGIC2A &&
-                        magic2 != LINUX_REBOOT_MAGIC2B &&
-                        magic2 != LINUX_REBOOT_MAGIC2C))
-                return -EINVAL;
-
-        /*
-         * If pid namespaces are enabled and the current task is in a child
-         * pid_namespace, the command is handled by reboot_pid_ns() which will
-         * call do_exit().
-         */
-        ret = reboot_pid_ns(pid_ns, cmd);
-        if (ret)
-                return ret;
-
-        /* Instead of trying to make the power_off code look like
-         * halt when pm_power_off is not set do it the easy way.
-         */
-        if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
-                cmd = LINUX_REBOOT_CMD_HALT;