linux-kernel - Re: [PATCH v5 2/7] dma: Add simple dma_noop

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Message-ID: <20170620132324.GA11370@infradead.org>
Date:   Tue, 20 Jun 2017 06:23:24 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Vladimir Murzin <vladimir.murzin@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...linux.org.uk, sza@....hu, arnd@...db.de,
        gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        alexandre.torgue@...com, robin.murphy@....com,
        benjamin.gaignard@...aro.org, kbuild-all@...org,
        Joerg Roedel <jroedel@...e.de>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v5 2/7] dma: Add simple dma_noop_mmap

On Wed, May 24, 2017 at 11:24:27AM +0100, Vladimir Murzin wrote:
> This patch adds a simple implementation of mmap to dma_noop_ops.

Currently we use dma_common_mmap as the generic fallback if a dma_ops
instance doesn't implement a mmap method.  Can you just fix up
dma_common_mmap for your nommu case - it looks like yours is basically
a subset.

In fact I suspect yours should call dma_mmap_from_coherent as well,
so the only different is the lack of pgprot_noncached call.