From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@lst.de>, Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/10] swiotlb: remove a pointless comment
Date: Thu, 11 Oct 2018 18:49:22 +0100 [thread overview]
Message-ID: <d2af8feb-c616-fe7c-62c2-80d73bd75e53@arm.com> (raw)
In-Reply-To: <20181008080246.20543-2-hch@lst.de>
On 08/10/18 09:02, Christoph Hellwig wrote:
> This comments describes an aspect of the map_sg interface that isn't
> even exploited by swiotlb.
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> kernel/dma/swiotlb.c | 6 ------
> 1 file changed, 6 deletions(-)
>
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 4f8a6dbf0b60..9062b14bc7f4 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -925,12 +925,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
> * appropriate dma address and length. They are obtained via
> * sg_dma_{address,length}(SG).
> *
> - * NOTE: An implementation may be able to use a smaller number of
> - * DMA address/length pairs than there are SG table elements.
> - * (for example via virtual mapping capabilities)
> - * The routine returns the number of addr/length pairs actually
> - * used, at most nents.
> - *
> * Device ownership issues as mentioned above for swiotlb_map_page are the
> * same here.
> */
>
next prev parent reply other threads:[~2018-10-11 17:49 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-08 8:02 move swiotlb noncoherent dma support from arm64 to generic code V2 Christoph Hellwig
2018-10-08 8:02 ` [PATCH 01/10] swiotlb: remove a pointless comment Christoph Hellwig
2018-10-11 17:49 ` Robin Murphy [this message]
2018-10-19 0:09 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 02/10] swiotlb: mark is_swiotlb_buffer static Christoph Hellwig
2018-10-11 17:54 ` Robin Murphy
2018-10-19 0:12 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 03/10] swiotlb: do not panic on mapping failures Christoph Hellwig
2018-10-11 18:06 ` Robin Murphy
2018-10-19 0:18 ` Konrad Rzeszutek Wilk
2018-10-19 0:17 ` Konrad Rzeszutek Wilk
2018-10-19 6:04 ` Christoph Hellwig
2018-10-19 13:45 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 04/10] swiotlb: remove the overflow buffer Christoph Hellwig
2018-10-11 18:19 ` Robin Murphy
2018-10-12 17:04 ` Catalin Marinas
2018-10-19 0:23 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 05/10] swiotlb: merge swiotlb_unmap_page and unmap_single Christoph Hellwig
2018-10-18 17:44 ` Robin Murphy
2018-10-19 0:25 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 06/10] swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs Christoph Hellwig
2018-10-18 17:53 ` Robin Murphy
2018-10-19 0:33 ` Konrad Rzeszutek Wilk
2018-11-07 1:27 ` John Stultz
2018-11-09 7:49 ` Christoph Hellwig
2018-11-09 16:37 ` Robin Murphy
2018-11-19 19:36 ` Robin Murphy
2018-11-20 9:22 ` Christoph Hellwig
2018-11-13 0:07 ` John Stultz
2018-11-13 0:26 ` John Stultz
2018-11-14 14:13 ` Christoph Hellwig
2018-11-14 16:12 ` Christoph Hellwig
2018-11-19 23:22 ` John Stultz
2018-11-20 9:25 ` Christoph Hellwig
2018-11-23 18:27 ` Will Deacon
2018-11-23 19:34 ` Robin Murphy
2018-11-26 19:31 ` Will Deacon
2018-10-08 8:02 ` [PATCH 07/10] swiotlb: refactor swiotlb_map_page Christoph Hellwig
2018-10-18 18:09 ` Robin Murphy
2018-10-19 0:37 ` Konrad Rzeszutek Wilk
2018-10-19 6:52 ` Christoph Hellwig
2018-10-19 13:46 ` Konrad Rzeszutek Wilk
2018-10-08 8:02 ` [PATCH 08/10] swiotlb: don't dip into swiotlb pool for coherent allocations Christoph Hellwig
2018-10-12 17:04 ` Catalin Marinas
2018-10-19 0:40 ` Konrad Rzeszutek Wilk
2018-10-19 16:45 ` Robin Murphy
2018-10-08 8:02 ` [PATCH 09/10] swiotlb: add support for non-coherent DMA Christoph Hellwig
2018-10-19 0:49 ` Konrad Rzeszutek Wilk
2018-10-22 17:11 ` Robin Murphy
2018-10-26 8:04 ` Christoph Hellwig
2018-10-26 9:59 ` Robin Murphy
2018-10-08 8:02 ` [PATCH 10/10] arm64: use the generic swiotlb_dma_ops Christoph Hellwig
2018-10-12 13:01 ` Robin Murphy
2018-10-12 14:40 ` Christoph Hellwig
2018-10-12 17:05 ` Catalin Marinas
2018-10-22 17:52 ` Robin Murphy
2018-10-26 12:44 ` Christoph Hellwig
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