Messages in this thread | | | Date | Tue, 15 Nov 2005 08:28:42 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/10] Cr4 is valid on some 486s |
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Dave Jones wrote: > > > > 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. >
The point that you don't nop if you have hotplug enabled (which is not the norm.)
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