Re: [PATCH] net: don't use kvzalloc for DMA memory

[Mikulas Patocka]

On Wed, 18 Apr 2018, David Miller wrote:

> From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
> Date: Wed, 18 Apr 2018 12:44:25 -0400 (EDT)
> 
> > The structure net_device is followed by arbitrary driver-specific data 
> > (accessible with the function netdev_priv). And for virtio-net, these 
> > driver-specific data must be in DMA memory.
> 
> And we are saying that this assumption is wrong and needs to be
> corrected.

So, try to find all the networking drivers that to DMA to the private 
area.

The problem here is that kvzalloc usually returns DMA-able area, but it 
may return non-DMA area rarely, if the memory is too fragmented. So, we 
are in a situation, where some networking drivers will randomly fail. Go 
and find them.

Mikulas