[PATCHv4 1/5] arm64: Add support for hooks to handle undefined instructions

Hi Catalin,

Catalin Marinas [off-list ref] writes:

On Wed, Nov 12, 2014 at 11:44:48AM +0000, Punit Agrawal wrote:

quoted

+int register_undef_hook(struct undef_hook *hook)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&undef_lock, flags);
+	list_add(&hook->node, &undef_hook);
+	raw_spin_unlock_irqrestore(&undef_lock, flags);
+
+	return 0;
+}

I missed this. Why do we need this function to return something? I don't
see how it would fail.

You're right. I don't remember why I changed the return type when
porting this over from arm. I'll update this and affected code.

Cheers,
Punit