| Date | Wed, 17 Feb 2010 17:32:41 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 34/35] x86: use num_processors for possible cpus |
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On 02/10/2010 01:20 AM, Yinghai Lu wrote: > some systems that have disable cpus entries because same > BIOS will support 2 sockets and 4 sockets and more at > same time, BIOS just leave some disable entries, but > those system do not support cpu hotplug. we don't need > treat disabled_cpus as hotplug cpus. > so we can make nr_cpu_ids smaller and save more space > (pcpu data allocations), and could make some systems run > with logical flat instead of physical flat apic mode > > -v2: change to black list instead > -v3: just remove that, and the one use possible_cpus= directly. > > Signed-off-by: Yinghai Lu <yinghai@kernel.org>
I'm confused by this one. This would seem to mean that unless you're specifying possible_cpus= then you are not treating anything as hotpluggable.
This is clearly wrong, and it would appear to go the wrong direction in terms of what is safe.
What am I missing here?
-hpa
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