linux-kernel - Re: [PATCH 3/9] dma: Add dma_virt

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Date:   Wed, 11 Jan 2017 16:07:35 -0800
From:   Bart Van Assche <bart.vanassche@...disk.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Doug Ledford <dledford@...hat.com>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Joerg Roedel <jroedel@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        "Michael S . Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH 3/9] dma: Add dma_virt_ops

On 01/11/2017 12:56 AM, Christoph Hellwig wrote:
>> +lib-$(CONFIG_HAS_DMA) += dma-virt.o
> 
> There probably should be a config option for it for two reasons:
> 
>  - do not bloat kernels that don't need it.
>  - the feature can only work for 32-bit architectures or for
>    64-bit architectures that set ARCH_DMA_ADDR_T_64BIT…
>    Alternatively this option would have to force
>    ARCH_DMA_ADDR_T_64BIT when not yet set for 64-bit architectures.
> 
> And yes, this is currently broken already for, but we'd better fix it.

Hello Christoph,

That sounds like a good idea to me. I will make sure that both
dma_noop_ops and dma_virt_ops are only built if needed.

Bart.