Messages in this thread | | | Date | Tue, 15 Nov 2005 11:19:49 -0500 | From | Dave Jones <> | Subject | Re: [PATCH 1/10] Cr4 is valid on some 486s |
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On Tue, Nov 15, 2005 at 08:14:29AM -0800, H. Peter Anvin wrote: > Dave Jones wrote: > >On Tue, Nov 15, 2005 at 05:06:03PM +0100, Arjan van de Ven wrote: > > > > > > You still need to preserve the originals so that you can patch in > > both > > directions. > > > > > > why do you insist on both directions? That still sounds like real > > > overkill to me. > > > >cpu hotplug going from UP to SMP ? :) > > > > If you have CPU hotplug enabled, you can run SMP code!
Sure, but if you boot with 1 CPU, spinlocks get nop'd to emulate UP, and on a 'installed a new cpu' hotplug event, they all come back.
Dave
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