diff --git a/arch/m68knommu/kernel/ptrace.c b/arch/m68knommu/kernel/ptrace.c
index 9130119537b9..72d349623575 100644
--- a/arch/m68knommu/kernel/ptrace.c
+++ b/arch/m68knommu/kernel/ptrace.c
@@ -62,7 +62,7 @@ static inline long get_reg(struct task_struct *task, int regno)
 
 	if (regno == PT_USP)
 		addr = &task->thread.usp;
-	else if (regno < sizeof(regoff)/sizeof(regoff[0]))
+	else if (regno < ARRAY_SIZE(regoff))
 		addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
 	else
 		return 0;
@@ -79,7 +79,7 @@ static inline int put_reg(struct task_struct *task, int regno,
 
 	if (regno == PT_USP)
 		addr = &task->thread.usp;
-	else if (regno < sizeof(regoff)/sizeof(regoff[0]))
+	else if (regno < ARRAY_SIZE(regoff))
 		addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
 	else
 		return -1;
diff --git a/arch/m68knommu/kernel/traps.c b/arch/m68knommu/kernel/traps.c
index 9129b3a5258b..bed5f47bf568 100644
--- a/arch/m68knommu/kernel/traps.c
+++ b/arch/m68knommu/kernel/traps.c
@@ -158,7 +158,7 @@ void show_stack(struct task_struct *task, unsigned long *stack)
 void bad_super_trap(struct frame *fp)
 {
 	console_verbose();
-	if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
+	if (fp->ptregs.vector < 4 * ARRAY_SIZE(vec_names))
 		printk (KERN_WARNING "*** %s ***   FORMAT=%X\n",
 			vec_names[(fp->ptregs.vector) >> 2],
 			fp->ptregs.format);