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
  13         size_t len = 0;
  14         bool con_available = false;
  15
  16         /* only dump kmsg when no console is available */
  17         if (!console_trylock())
  18                 return;
  19
  20         if (console_drivers != NULL)
  21                 con_available = true;
  22
  23         console_unlock();
  24
  25         if (con_available == true)
  26                 return;
  27
  28         printf("kmsg_dump:\n");
  29         while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
  30                 line[len] = '\0';
  31                 printf("%s", line);
  32         }
  33 }
  34
  35 static struct kmsg_dumper kmsg_dumper = {
  36         .dump = kmsg_dumper_stdout
  37 };
  38
  39 int __init kmsg_dumper_stdout_init(void)
  40 {
  41         return kmsg_dump_register(&kmsg_dumper);
  42 }
  43
  44 __uml_postsetup(kmsg_dumper_stdout_init);