uml: move register initialization

Calling init_registers inside the skas3 checking causes mysterious crashes if
it doesn't happen because the skas3 checking is bypassed.  This patch moves it
to os_early_checks.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/os-Linux/start_up.c

@@ -342,6 +342,8 @@ static void __init check_coredump_limit(void)
 
 void __init os_early_checks(void)
 {
+	int pid;
+
 	/* Print out the core dump limits early */
 	check_coredump_limit();
 
@@ -351,6 +353,11 @@ void __init os_early_checks(void)
 	 * kernel is running.
 	 */
 	check_tmpexec();
+
+	pid = start_ptraced_child();
+	if (init_registers(pid))
+		fatal("Failed to initialize default registers");
+	stop_ptraced_child(pid, 1, 1);
 }
 
 static int __init noprocmm_cmd_param(char *str, int* add)
@@ -412,9 +419,6 @@ static inline void check_skas3_ptrace_faultinfo(void)
 			non_fatal("found\n");
 	}
 
-	if (init_registers(pid))
-		fatal("Failed to initialize default registers");
-
 	stop_ptraced_child(pid, 1, 1);
 }