Linus Torvalds writes:

quoted text
> We should just do this natively. There's been several tests over the years 
> saying that it's much more efficient to do sti/cli as a simple store, and 
> handling the "oops, we got an interrupt while interrupts were disabled" as 
> a special case.
> 
> I have this dim memory that ARM has done it that way for a long time 
> because it's so expensive to do a "real" cli/sti.
> 
> And I think -rt does it for other reasons. It's just more flexible.

64-bit powerpc does this now as well.

Paul.
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