Re: Linux patch disabling AVX when eagerfpu is turned off - possibly not required

[Andy Lutomirski]

On Jan 21, 2016 12:12 PM, "H. Peter Anvin" <hpa@xxxxxxxxx> wrote:
>
> On 01/21/16 12:08, Dave Hansen wrote:
> > On 01/21/2016 02:33 AM, Leonid Shatz wrote:
> >> In view of above findings we would like to suggest to double check if
> >> disabling AVX together with "eagerfpu off" is actually required and is a
> >> real necessity. It would be helpful to consult with Intel engineers
> >> regarding related design details.
> >
> > Hi Leonid,
> >
> > Thanks for the report!
> >
> > Are you aware of any actual eagerfpu=off use in practice, or is this
> > mostly a theoretical concern?
> >
>
> Looking into this, FWIW.

I still think that we should default eagerfpu=on on all CPUs for one
release and then, when nothing breaks, delete all the old lazy code.
I'll respin and send that patch.

--Andy