On Tue, Jan 30, 2018 at 11:03:50AM +0000, David Woodhouse wrote:
> I pondered that, but I didn't like it. I didn't want to always *force*
> those features on, for all CPUs, just because they happened to be
> discovered at boot time on the first CPU (which *did* have its
> microcode updated by the crappy BIOS, while the others didn't).
>
> I strongly suspect that's purely an academic concern, and we mostly
> check boot_cpu_has() and never even *notice* if secondary CPUs don't
> match. I just didn't want to make that *worse*. It tickled my OCD.
Well, you need to do it because those bits are AMD-specific and they are
not set in the Intel CPUID leaf and identify_cpu() towards the end takes
care of "ironing" all those bits out which are not part of the common
feature set and which get_cpu_cap() has *not* read out from CPUID.
It is one of those I-told-you-so moments when I suggested to make the
visible feature bits the artificial ones and have the *actual* hardware
ones set those.
:-)
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
