Re: recursive spinlocks. Shoot.

[Martin J. Bligh]

> That's a problem looking for a solution!  No, the reason for wanting a
> recursive spinlock is that nonrecursive locks make programming harder.

And more correct.
 
> Though I've got quite good at finding and removing deadlocks in my old
> age, there are still two popular ways that the rest of the world's
> prgrammers often shoot themselves in the foot with a spinlock:
> 
>    a) sleeping while holding the spinlock
>    b) taking the spinlock in a subroutine while you already have it

So ... we should BUG() on both.

M.