Subject: Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

From: [email-masked]
Date: Mon, 18 Apr 2016 09:06:18 -0400

On 2016-04-18 08:12, Christoph Hellwig wrote:
> On Sat, Apr 16, 2016 at 06:23:32PM -0400, Sinan Kaya wrote:
>> Current code is assuming that the address returned by 
>> dma_alloc_coherent
>> is a logical address. This is not true on ARM/ARM64 systems.
> 
> Can you explain what you mean with a 'logical address' and what actual
> issue you're trying to solve?

Vmap call is failing on arm64 systems because dma alloc api already 
returns an address mapped with vmap.

Please see arch/arm64/mm directory.