linux/kernel/power/poweroff.c
Zhang Rui 2f15fc4bdf pm: schedule sysrq poweroff on boot cpu
schedule sysrq poweroff on boot cpu.

sysrq poweroff needs to disable nonboot cpus, and we need to run this on boot
cpu to avoid any recursion.  http://bugzilla.kernel.org/show_bug.cgi?id=10897

[kosaki.motohiro@jp.fujitsu.com: build fix]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Rus <harbour@sfinx.od.ua>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:24 -07:00

46 lines
1,000 B
C

/*
* poweroff.c - sysrq handler to gracefully power down machine.
*
* This file is released under the GPL v2
*/
#include <linux/kernel.h>
#include <linux/sysrq.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
#include <linux/cpumask.h>
/*
* When the user hits Sys-Rq o to power down the machine this is the
* callback we use.
*/
static void do_poweroff(struct work_struct *dummy)
{
kernel_power_off();
}
static DECLARE_WORK(poweroff_work, do_poweroff);
static void handle_poweroff(int key, struct tty_struct *tty)
{
/* run sysrq poweroff on boot cpu */
schedule_work_on(first_cpu(cpu_online_map), &poweroff_work);
}
static struct sysrq_key_op sysrq_poweroff_op = {
.handler = handle_poweroff,
.help_msg = "powerOff",
.action_msg = "Power Off",
.enable_mask = SYSRQ_ENABLE_BOOT,
};
static int pm_sysrq_init(void)
{
register_sysrq_key('o', &sysrq_poweroff_op);
return 0;
}
subsys_initcall(pm_sysrq_init);