linux-kernel - Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

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Date:	Mon, 18 Apr 2016 09:06:18 -0400
From:	okaya@...eaurora.org
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-rdma@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, Yishai Hadas <yishaih@...lanox.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

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.