Merge tag 'linux-kselftest-4.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.git] / arch / um / kernel / kmsg_dump.c
1 #include <linux/kmsg_dump.h>
2 #include <linux/console.h>
3 #include <shared/init.h>
4 #include <shared/kern.h>
5 #include <os.h>
6
7 static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
8                                 enum kmsg_dump_reason reason)
9 {
10         static char line[1024];
11
12         size_t len = 0;
13         bool con_available = false;
14
15         /* only dump kmsg when no console is available */
16         if (!console_trylock())
17                 return;
18
19         if (console_drivers != NULL)
20                 con_available = true;
21
22         console_unlock();
23
24         if (con_available == true)
25                 return;
26
27         printf("kmsg_dump:\n");
28         while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
29                 line[len] = '\0';
30                 printf("%s", line);
31         }
32 }
33
34 static struct kmsg_dumper kmsg_dumper = {
35         .dump = kmsg_dumper_stdout
36 };
37
38 int __init kmsg_dumper_stdout_init(void)
39 {
40         return kmsg_dump_register(&kmsg_dumper);
41 }
42
43 __uml_postsetup(kmsg_dumper_stdout_init);