Messages in this thread | | | Date | Wed, 21 Mar 2007 11:03:14 +1100 | From | Paul Mackerras <> | Subject | Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable |
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Linus Torvalds writes:
> 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.
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