Comment 12 for bug 1233466

Please don't apply this udev rule as it is:

 * It can be made *much* more efficient and avoid an extra shell with

     SUBSYSTEM=="memory", ACTION=="add", DEVPATH=="/devices/system/memory/memory*[0-9]", ATTR{online}="1"

   (same for the other rule)

 * In this generic way they don't look plausible. If we *always* want hotplugged CPUs and memory to be online (which sounds plausible), then the kernel should do just that. It shouldn't require lots of extra userspace overhead to always set a driver attribute to a constant value. It is certainly ok as a workaround until the kernel gets fixed properly, though.

 * If this applies to Hyper-V only, it would be better to surround these rules with some check if the system is actually running on this hypervisor. This might happen via DMI data (like ATTR{[dmi/id]product_version}=="hyper-v"), the presence of a Hyper-V specific device/subsystem in sysfs, and so on. This ATTR{[subsystem/device]attribute} syntax works generically by the way, so that you can look at a device different than the one you are currently selecting.