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

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Date:   Wed, 11 Jan 2017 00:56:25 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Bart Van Assche <bart.vanassche@...disk.com>
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

> +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…
   Altenatiely 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.