Re: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces

From: Hugh Dickins
Date: Sat Jul 30 2005 - 14:30:59 EST

On Fri, 29 Jul 2005, Frank van Maarseveen wrote:
> 2.6.13-rc4 does not recognize the second CPU of a 3GHz HT P4:

I think your problem is this: HT has depended on CONFIG_ACPI for
some while, and now in 2.6.13-rc CONFIG_ACPI depends on CONFIG_PM.
You don't have CONFIG_PM set in your .config (nor had I), so you
don't get ACPI, so you don't get HT.

I don't know why CONFIG_ACPI now depends on CONFIG_PM: it seemed
gratuitous when it first hit me, looked like someone just felt it
was a nice arrangement. But seems particularly unhelpful for HT.

On the other hand, I can well understand Len wanting to simplify
the ACPI config interdependencies, which have caused breakage
after breakage after breakage.

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