1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kmsg_dump.h>
3 #include <linux/spinlock.h>
4 #include <linux/console.h>
5 #include <linux/string.h>
6 #include <shared/init.h>
7 #include <shared/kern.h>
10 static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
11 enum kmsg_dump_reason reason)
13 static struct kmsg_dump_iter iter;
14 static DEFINE_SPINLOCK(lock);
15 static char line[1024];
22 * If no consoles are available to output crash information, dump
23 * the kmsg buffer to stdout.
26 cookie = console_srcu_read_lock();
27 for_each_console_srcu(con) {
29 * The ttynull console and disabled consoles are ignored
30 * since they cannot output. All other consoles are
31 * expected to output the crash information.
33 if (strcmp(con->name, "ttynull") != 0 &&
34 (console_srcu_read_flags(con) & CON_ENABLED)) {
38 console_srcu_read_unlock(cookie);
42 if (!spin_trylock_irqsave(&lock, flags))
45 kmsg_dump_rewind(&iter);
47 printf("kmsg_dump:\n");
48 while (kmsg_dump_get_line(&iter, true, line, sizeof(line), &len)) {
53 spin_unlock_irqrestore(&lock, flags);
56 static struct kmsg_dumper kmsg_dumper = {
57 .dump = kmsg_dumper_stdout
60 int __init kmsg_dumper_stdout_init(void)
62 return kmsg_dump_register(&kmsg_dumper);
65 __uml_postsetup(kmsg_dumper_stdout_init);