[PATCH 00/13] powerpc: Backport 8xx TLB to 2.4

[Joakim Tjernlund]

Willy Tarreau <w at 1wt.eu> wrote on 2011/01/11 21:08:53:
>
> On Tue, Jan 11, 2011 at 09:12:44AM +0100, Joakim Tjernlund wrote:
> > Willy Tarreau <w at 1wt.eu> wrote on 2011/01/11 07:09:26:
> > >
> > > Hi Joakim,
> > >
> > > On Mon, Jan 10, 2011 at 10:37:46PM +0100, Joakim Tjernlund wrote:
> > > > This is a backport from 2.6 which I did to overcome 8xx CPU
> > > > bugs. 8xx does not update the DAR register when taking a TLB
> > > > error caused by dcbX and icbi insns which makes it very
> > > > tricky to use these insns. Also the dcbst wrongly sets the
> > > > the store bit when faulting into DTLB error.
> > > > A few more bugs very found during development.
> > > >
> > > > I know 2.4 is in strict maintenance mode and 8xx is obsolete
> > > > but as it is still in use I wanted 8xx to age with grace.
> > >
> > > Thank you very much for taking care of this, that's very much appreciated.
> > > I'll look at this ASAP. Just a quick question in order to be certain, did
> > > you have the opportunity to test all of these changes on real hardware ?
> >
> > I tested these on real 8xx HW but I used an older 2.4 linux as we haven't
> > moved forward on 2.4 for quite some time.
> > The affected files were almost identical though.
>
> OK thank you for this precision. If you remember what version it was, we can
> also diff it against mainline and see if we spot any relevant changes that
> we need to take care of.

2.4.21-rc6 is the base version. The we have added bits and pieces.


>
> > Would be great if Scott could give them a spin on 8xx with current 2.4.
>
> Indeed, that would be great. My goal really is that 2.4 users can upgrade
> without wondering about any risk of regression. I appreciate a lot your
> fixes, they mean some people might see that some issues have suddenly
> disappeared. But it's important to stay on the non-reg side as much as
> possible.

Should be faster too :)