linux-kernel - Re: [PATCH 08/22] swiotlb: wire up ->dma_supported in swiotlb_dma

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Date:   Wed, 10 Jan 2018 12:16:15 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org
Cc:     linux-arch@...r.kernel.org, linux-mips@...ux-mips.org,
        Michal Simek <monstr@...str.eu>, linux-ia64@...r.kernel.org,
        Christian König <ckoenig.leichtzumerken@...il.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Konrad Rzeszutek Wilk <konrad@...nok.org>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 08/22] swiotlb: wire up ->dma_supported in swiotlb_dma_ops

On 10/01/18 08:09, Christoph Hellwig wrote:
> To properly reject too small DMA masks based on the addressability of the
> bounce buffer.

I reckon this is self-evident enough that it should simply be squashed 
into the previous patch.

Robin.

> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   lib/swiotlb.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index 0fae2f45c3c0..539fd1099ba9 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -1128,5 +1128,6 @@ const struct dma_map_ops swiotlb_dma_ops = {
>   	.unmap_sg		= swiotlb_unmap_sg_attrs,
>   	.map_page		= swiotlb_map_page,
>   	.unmap_page		= swiotlb_unmap_page,
> +	.dma_supported		= swiotlb_dma_supported,
>   };
>   #endif /* CONFIG_DMA_DIRECT_OPS */
>