/* SPDX-License-Identifier: GPL-2.0 *//* *  Unified handling of special chars. * *    Copyright IBM Corp. 2001 *    Author(s): Fritz Elfert <felfert@millenux.com> <elfert@de.ibm.com> * */ #include <linux/tty.h>#include <linux/sysrq.h>#include <linux/workqueue.h> extern unsigned intctrlchar_handle(const unsigned char *buf, int len, struct tty_struct *tty);  #define CTRLCHAR_NONE  (1 << 8)#define CTRLCHAR_CTRL  (2 << 8)#define CTRLCHAR_SYSRQ (3 << 8) #define CTRLCHAR_MASK (~0xffu)  #ifdef CONFIG_MAGIC_SYSRQstruct sysrq_work {	int key;	struct work_struct work;}; void schedule_sysrq_work(struct sysrq_work *sw);#endif