spin_is_locked() broken for uniprocessor?

[Thomas Gleixner]

On Tue, 18 Aug 2009, Kumar Gala wrote:
> I just want to validate that what I'm seeing (for UP, non-debug features):
> 
> spin_is_locked() is defined as:
> 
> include/linux/spinlock.h:#define spin_is_locked(lock)
> __raw_spin_is_locked(&(lock)->raw_lock)
> 
> for UP that should get us:
> 
> include/linux/spinlock_up.h:#define __raw_spin_is_locked(lock)  ((void)(lock),
> 0)
> 
> 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.

Thanks,

	tglx