Messages in this thread | | | Date | Tue, 8 Nov 2005 14:26:50 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 14/21] i386 Apm is on cpu zero only |
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* Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> On Maw, 2005-11-08 at 04:53 -0800, Zachary Amsden wrote: > > Can't hurt, and APM is largely obsolete because of ACPI, so I'm only > > concerned with trimming and keeping adequate protection of the kernel > > from APM code while maintaining correctness. I don't have a nice set of > > old machines with enough wacky APM BIOSen to validate that unpinning the > > CPU is ok. > > A large number of SMP machines, probably the majority of APM based > ones require that APM calls occur on CPU#0. As I understand it from a > BIOS engineer involved in debugging that problem Redmond always does > APM from CPU #0 and may even guarantee it.
ok, then i'm all for making that more explicit - i.e. Zachary's patch is the right one.
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