From: Benjamin Herrenschmidt
> On Fri, 2014-11-28 at 08:45 +0530, Madhavan Srinivasan wrote:
> > > Can't we just unconditionally clear at as long as we do that after we've
> > > saved it ? In that case, it's just a matter for the fixup code to check
> > > the saved version rather than the actual CR..
> > >
> > I use CR bit setting in the interrupt return path to enter the fixup
> > section search. If we unconditionally clear it, we will have to enter
> > the fixup section for every kernel return nip right?
>
> As I said above. Can't we look at the saved version ?
>
> IE.
>
> - On interrupt entry:
>
> * Save CR to CCR(r1)
> * clear CR5
>
> - On exit
>
> * Check CCR(r1)'s CR5 field
> * restore CR
Actually there is no real reason why the 'fixup' can't be done
during interrupt entry.
David
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