kdb: Switch to nolock variants of kmsg_dump functions

The locked variants are prone to deadlocks (suppose we got to the
debugger w/ the logbuf lock held), so let's switch to nolock variants.

Signed-off-by: Anton Vorontsov <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/debug/kdb/kdb_main.c

···
 		kdb_set(2, setargs);
 	}
 
-	kmsg_dump_rewind(&dumper);
-	while (kmsg_dump_get_line(&dumper, 1, NULL, 0, NULL))
+	kmsg_dump_rewind_nolock(&dumper);
+	while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
 		n++;
 
 	if (lines < 0) {
···
 	if (skip >= n || skip < 0)
 		return 0;
 
-	kmsg_dump_rewind(&dumper);
-	while (kmsg_dump_get_line(&dumper, 1, buf, sizeof(buf), &len)) {
+	kmsg_dump_rewind_nolock(&dumper);
+	while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
 		if (skip) {
 			skip--;
 			continue;