Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

David Howells
2006-12-06T19:46:37Z

Linus Torvalds <torvalds@osdl.org> wrote:

> Also, I don't see quite why you think "cmpxchg()" and "atomic_cmpxchg()"
> would be different. ANY cmpxchg() needs to be atomic - if it's not,
> there's no point to the operation at all, since you'd just write it as

It's not that atomic_cmpxchg() is different to cmpxchg(), it's that
atomic_set() is different to direct assignment.

atomic_set() on PA-RISC, for example, has spinlocks in it.

David