Messages in this thread |  | | From | "H. Peter Anvin" <> | Date | 9 Oct 2001 18:38:39 -0700 |
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Followup to: <p05100361b77232f67994@[207.213.214.37]> By author: Jonathan Lundell <jlundell@pobox.com> In newsgroup: linux.dev.kernel > > At 4:28 PM +0200 2001-07-11, Dave Jones wrote: > >On Wed, 11 Jul 2001, Hugh Dickins wrote: > > > >> Am I paranoid? > > > >Probably :) > >The Intel CPUs with PSN I've seen simply drop 1 level. > >What other CPUs support this feature? ISTR Transmeta had it? > >Do they behave the same? > > > >> I feel nervous about "c->cpuid_level--" inferring > >> what we expect to happen to it, would prefer to check it (below). > >> + c->cpuid_level = cpuid_eax(0); > > > >No biggie, either solution is fine with me. > > HD's version has the advantage of not having to make assumptions > about how future CPUs might handle the level, and leaves open the > alternative possibility of leaving the level at 3 (or some future 4) > and just turning off the serial-number capability. >
cpuid_level-- is wrong on at least one existing processor (Crusoe), which doesn't have CPUID level 2 and therefore goes from 3 to 1.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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