* Dave Hansen <d...@sr71.net> wrote:
> On 08/08/2015 02:06 AM, Ingo Molnar wrote:
> >>> What sense does it make to have a blob we don't know the exact layout of?
> >>> How will
> >>> > > debuggers or user-space in general be able to print (and change) the
> >>> > > register
> >>> > > values if they don't know the layout?
> >> >
> >> > Ingo, we know the layout. We know where every component is. We know
> >> > how big each component is. This patch does not change the fact that we
> >> > calculate and store that.
> > The patch you submitted blindly trusts the CPU, and I'm uneasy about that
> > for
> > multiple reasons. We can and should do better than that, while still
> > flexibly
> > making use of all CPU capabilities that are offered.
>
> Yes, it blindly trusts the CPU. This is precisely* what the *existing*
> code has done since commit dc1e35c6e95 got merged in 2008. Do you have
> some specific concern with the compact format that makes you want to
> stop blindly trusting the CPU after 7 years?
Yes, the fact that 'compact format' probably never worked well and we had to
revert use of it.
> I know what you want now (I've coded up half of it already), but I've not got
> the foggiest idea why other than pure paranoia.
There were multiple bugs in this code so some amount of paranoia is justified.
Thanks,
Ingo
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