linux-kernel - Re: [PATCH 01/10] swiotlb: remove a pointless comment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <d2af8feb-c616-fe7c-62c2-80d73bd75e53@arm.com>
Date:   Thu, 11 Oct 2018 18:49:22 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>, Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] swiotlb: remove a pointless comment

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@....com>

> Signed-off-by: Christoph Hellwig <hch@....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.
>    */
>