Re: [PATCH 2.6][resend] Add DEVPATH env variable to hotplug helper call

Keshavamurthy Anil S
2004-10-04T17:23:09Z

On Sun, Oct 03, 2004 at 04:20:12PM -0700, Andrew Morton wrote:
> Does CPU hotplug behave correctly wrt /sys/devices/system/cpu? Given that
> register_cpu() is still marked __init, I assume not.

Currently what we have in the kernel is logical cpu hotplug, i.e once the
cpu is registered via register_cpu() that cpu can only go offline and still
the entry for that cpu will be present in the /sys/devices/system/cpu/cpuX/online.

So __init register_cpu() is fine untill we support unregister_cpu()
which is required for physical cpu hotplug case.

I have submitted ACPI based physical cpu hotplug patches and waiting to here from
ACPI mainitainer Len Brown, there I have taken care to support unregister_cpu()
and register_cpu() is marked as __devinit in those patches.
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