linux-kernel - Re: [PATCH] dma-direct: Export dma_direct_alloc() and dma_direct

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Message-ID: <20190205161036.GA782@lst.de>
Date:   Tue, 5 Feb 2019 17:10:36 +0100
From:   Christoph Hellwig <hch@....de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-direct: Export dma_direct_alloc() and
 dma_direct_free()

On Tue, Feb 05, 2019 at 12:06:02PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> Drivers that are built as modules may want to use these functions, so
> make them available like the rest of the functions.
> 
> Signed-off-by: Thierry Reding <treding@...dia.com>

How do they want to use these functions?  The proper way is to
call dma_alloc_coherent / dma_alloc_free and let the DMA API
handle the rest.