> From: Yidong Ren <yid...@linuxonhyperv.com>
> Sent: Monday, July 23, 2018 6:26 PM
> +     pcpu_sum = kvmalloc(sizeof(struct netvsc_ethtool_pcpu_stats) *
> +                     num_present_cpus(), GFP_KERNEL);

Since there is no plan for CPU hotplug in Hyper-V in short term, it is fine 
to use num_present_cpus for now. We can move to debugfs later if necessary.
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