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Date: Wed, 21 Nov 2012 10:38:00 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Sasha Levin <sasha.levin@...cle.com> CC: tglx@...utronix.de, mingo@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org, penberg@...nel.org Subject: Re: [PATCH] x86, smpboot: allow manual hotplug of CPUs On 11/21/2012 10:35 AM, Sasha Levin wrote: >> >> Reading between the lines, this sounds like would cause a user-visible >> difference between mptable platforms and ACPI platforms? If so, that is >> totally unacceptable. If not, the description is confusing. > > With ACPI platforms you don't need probe/release because the hardware notifies > on CPU insert/eject - this doesn't exist on mptable which is why you have to > do it manually with probe/release. > > The difference is already user visible: you can hotplug on ACPI, but can't on > mptables. > > Yes, reading back the subject does sound confusing - a better one would probably > be "provide interface for CPU hotplug on mptable platforms" or something similar. > So, are there any mptables platforms which support hotplug? If the answer is "KVM" then the answer is that KVM needs to move to ACPI to get the proper functionality; putting a hack in is really not okay. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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