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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546// SPDX-License-Identifier: GPL-2.0-only/* * poweroff.c - sysrq handler to gracefully power down machine. */
#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(u8 key){ /* run sysrq poweroff on boot cpu */ schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);}
static const struct sysrq_key_op sysrq_poweroff_op = { .handler = handle_poweroff, .help_msg = "poweroff(o)", .action_msg = "Power Off", .enable_mask = SYSRQ_ENABLE_BOOT,};
static int __init pm_sysrq_init(void){ register_sysrq_key('o', &sysrq_poweroff_op); return 0;}
subsys_initcall(pm_sysrq_init);