Re: [patch 4/21] fix ARCH_HAS_PREFETCH

[H. Peter Anvin]

Alan Cox wrote:
> On Wed, 2002-08-14 at 21:58, H. Peter Anvin wrote:
> 
>>Since some processors now have "busy wait delay" instructions, this
>>would also make it possible to do:
> 
> 
> Nobody should be using an empty busy loop. If its a short timed busy
> loop then they should be using udelay, if its a long one
> schedule_timeout()
> 

Indeed.

> If its polling hardware then it isnt an empty loop

True indeed as well, although we should still have a busy_wait(); macro
that can insert whatever hint instruction the architecture might or
might not have.

	-hpa