spin_is_locked() broken for uniprocessor?

[Peter Zijlstra]

On Wed, 2009-08-19 at 10:38 +0100, David Howells wrote:
> Thomas Gleixner <tglx at linutronix.de> wrote:
> 
> > > which implies to me that spin_is_locked() will always return false.  Is this
> > > expected behavior.
> > 
> > That's wrong. spin_is_locked should always return true on UP.
> 
> Surely it's not that simple?  Maybe spin_is_lock() should be undefined on UP.

#define spin_is_locked(l) panic()

should sort things out quickly ;-)