Messages in this thread | | | Date | Wed, 14 Aug 2002 18:28:05 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [patch 4/21] fix ARCH_HAS_PREFETCH |
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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
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