Messages in this thread |  | | | Date | Thu, 08 May 2008 09:51:18 -0700 | | From | "H. Peter Anvin" <> | | Subject | Re: [PATCH] x86: introduce a new Linux defined feature flag for PAT support | |
Alan Cox wrote:
>> For old CPUs it is actually ok (after all they worked for years without
>> PAT), I just don't like it for new CPUs. It's a bad idea there and
>> in the x86 world it is a reasonable expectation that CPU features
>> generally work.
>
> Agreed 100%. We should default to assuming newer processors work. That
> will be true in almost if not all cases anyway, and since it'll bite
> anyone at Intel/AMD/.. testing new CPU steppings when it is on by default
> any problem cases won't be leaving the labs.
Yes, capping the upper end is an actively bad thing, because it can
actually *make* bugs appear (by artifically limiting testing by CPU houses.)
-hpa
|  |