arch/um/kernel/kmsg_dump.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kmsg_dump.h>
   3 #include <linux/console.h>
   4 #include <shared/init.h>
   5 #include <shared/kern.h>
   6 #include <os.h>
   7
   8 static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
   9                                 enum kmsg_dump_reason reason)
  10 {
  11         static char line[1024];
  12         struct console *con;
  13         size_t len = 0;
  14
  15         /* only dump kmsg when no console is available */
  16         if (!console_trylock())
  17                 return;
  18
  19         for_each_console(con)
  20                 break;
  21
  22         console_unlock();
  23
  24         if (con)
  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);