metag: copy_thread(): rename 'arg' argument to 'kthread_arg'

The 'arg' argument to copy_thread() is only ever used when forking a new
kernel thread. Hence, rename it to 'kthread_arg' for clarity.
Signed-off-by: Alex Dowad <alexinbeijing@gmail.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>

arch/metag/kernel/process.c

@@ -174,8 +174,11 @@ void show_regs(struct pt_regs *regs)
 	show_trace(NULL, (unsigned long *)regs->ctx.AX[0].U0, regs);
 }
 
+/*
+ * Copy architecture-specific thread state
+ */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long arg, struct task_struct *tsk)
+		unsigned long kthread_arg, struct task_struct *tsk)
 {
 	struct pt_regs *childregs = task_pt_regs(tsk);
 	void *kernel_context = ((void *) childregs +
@@ -202,12 +205,13 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		global_base = __core_reg_get(A1GbP);
 		childregs->ctx.AX[0].U1 = (unsigned long) global_base;
 		childregs->ctx.AX[0].U0 = (unsigned long) kernel_context;
-		/* Set D1Ar1=arg and D1RtP=usp (fn) */
+		/* Set D1Ar1=kthread_arg and D1RtP=usp (fn) */
 		childregs->ctx.DX[4].U1 = usp;
-		childregs->ctx.DX[3].U1 = arg;
+		childregs->ctx.DX[3].U1 = kthread_arg;
 		tsk->thread.int_depth = 2;
 		return 0;
 	}
+
 	/*
 	 * Get a pointer to where the new child's register block should have
 	 * been pushed.