[PATCH 1/9] swiotlb: remove a pointless comment

Christoph Hellwig hch at lst.de
Mon Sep 17 08:38:18 PDT 2018


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

Signed-off-by: Christoph Hellwig <hch at 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.
  */
-- 
2.18.0




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