From: Krzysztof Halasa <khc@pm.waw.pl>
Date: Wed, 23 Apr 2008 19:02:22 +0200

quoted text
> netdev_priv() was introduced at some point in time to allow
> alloc_netdev() to optionally allocate additional memory for internal
> use by the driver. It had nothing to do with dev->priv except "priv"
> name. The drivers don't use it passing size 0.

No, it was added as an optimization since the private
area was allocated together with the struct netdev, and
thus at a constant offset computable a compile time.

It was never meant to provide a facility to have two private areas
associated with a device, but unfortunately some broken stuff decided
to use it that way.
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