Re: 2.4.x and SMP fails to compile (`current' undefined)

[Alan Cox]

> > uninlining the code is too high a cost.
> 
> I question that. Athlon does branch prediction on call targets, function
> calls are cheap. 3dnow saves 25%-50% of cycles on a copy. How many function
> calls can be paid for with 1000 cycles or so?
> 
> My patch still inlines the standard string const_memcpy for the case of
> small known length.

We have a very large number of memcpy's of unknown short length (often in
interrupts) that are close to branches. A lot of

	if(foo==NULL)
		return
	memcpy(..

stuff for example.

Im more than happy for someone to do the benches and prove me wrong