// SPDX-License-Identifier: GPL-2.0#include <linux/kmsg_dump.h>#include <linux/spinlock.h>#include <linux/console.h>#include <linux/string.h>#include <shared/init.h>#include <shared/kern.h>#include <os.h> static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,				enum kmsg_dump_reason reason){	static struct kmsg_dump_iter iter;	static DEFINE_SPINLOCK(lock);	static char line[1024];	struct console *con;	unsigned long flags;	size_t len = 0;	int cookie; 	/*	 * If no consoles are available to output crash information, dump	 * the kmsg buffer to stdout.	 */ 	cookie = console_srcu_read_lock();	for_each_console_srcu(con) {		/*		 * The ttynull console and disabled consoles are ignored		 * since they cannot output. All other consoles are		 * expected to output the crash information.		 */		if (strcmp(con->name, "ttynull") != 0 &&		    (console_srcu_read_flags(con) & CON_ENABLED)) {			break;		}	}	console_srcu_read_unlock(cookie);	if (con)		return; 	if (!spin_trylock_irqsave(&lock, flags))		return; 	kmsg_dump_rewind(&iter); 	printf("kmsg_dump:\n");	while (kmsg_dump_get_line(&iter, true, line, sizeof(line), &len)) {		line[len] = '\0';		printf("%s", line);	} 	spin_unlock_irqrestore(&lock, flags);} static struct kmsg_dumper kmsg_dumper = {	.dump = kmsg_dumper_stdout}; int __init kmsg_dumper_stdout_init(void){	return kmsg_dump_register(&kmsg_dumper);} __uml_postsetup(kmsg_dumper_stdout_init);