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From: Christoph Hellwig <hch@lst.de>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/6] swiotlb: remove a pointless comment
Date: Tue, 15 May 2018 20:05:18 +0200	[thread overview]
Message-ID: <20180515180523.3038-2-hch@lst.de> (raw)
In-Reply-To: <20180515180523.3038-1-hch@lst.de>

This comments describes an aspect of the map_sg interface that isn't
even exploited by swiotlb.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 16ace0e25d52..721f93677eee 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -927,12 +927,6 @@ 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.
  */
-- 
2.17.0

  reply	other threads:[~2018-05-15 18:05 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-15 18:05 swiotlb cleanup Christoph Hellwig
2018-05-15 18:05 ` Christoph Hellwig [this message]
2018-05-18 20:22   ` [PATCH 1/6] swiotlb: remove a pointless comment Konrad Rzeszutek Wilk
2018-05-15 18:05 ` [PATCH 2/6] swiotlb: do not panic on mapping failures Christoph Hellwig
2018-05-18 20:21   ` Konrad Rzeszutek Wilk
2018-05-15 18:05 ` [PATCH 3/6] swiotlb: merge swiotlb_unmap_page and unmap_single Christoph Hellwig
2018-05-18 20:27   ` Konrad Rzeszutek Wilk
2018-05-15 18:05 ` [PATCH 4/6] swiotlb: mark is_swiotlb_buffer static Christoph Hellwig
2018-05-15 18:05 ` [PATCH 5/6] swiotlb: share more code between map_page and map_sg Christoph Hellwig
2018-05-15 18:05 ` [PATCH 6/6] swiotlb: respect DMA_ATTR_NO_WARN in __swiotlb_map_page Christoph Hellwig
2018-07-25 11:37 swiotlb cleanup (resend) Christoph Hellwig
2018-07-25 11:37 ` [PATCH 1/6] swiotlb: remove a pointless comment Christoph Hellwig

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