diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
index eaaaf805f31b6d32039376df4f0e9ffdec777b5d..5e4570ef515c5fd97937596814d7b8d9ee321d0c 100644
--- a/arch/microblaze/kernel/traps.c
+++ b/arch/microblaze/kernel/traps.c
@@ -22,13 +22,11 @@ void trap_init(void)
 	__enable_hw_exceptions();
 }
 
-static int kstack_depth_to_print = 24;
+static unsigned long kstack_depth_to_print = 24;
 
 static int __init kstack_setup(char *s)
 {
-	kstack_depth_to_print = strict_strtoul(s, 0, NULL);
-
-	return 1;
+	return !strict_strtoul(s, 0, &kstack_depth_to_print);
 }
 __setup("kstack=", kstack_setup);