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

Ivan Kokshaysky
2006-12-07T13:20:36Z

On Thu, Dec 07, 2006 at 08:31:08PM +1100, Nick Piggin wrote:
> It might be reasonable to implement this watered down version, but:
> don't some architectures have restrictions on what instructions can
> be issued between the ll and the sc?

Yes. On Alpha you cannot execute other load/stores, taken branches etc.
So in general case the code between ll and sc cannot be written in C...

Ivan.