From: FUJITA Tomonori on
Now we have <asm-generic/scatterlist.h>. Architectures should use it
instead of inventing the own scatterlist struct. Let's update the
description.

Signed-off-by: FUJITA Tomonori <fujita.tomonori(a)lab.ntt.co.jp>
---
Documentation/DMA-API-HOWTO.txt | 17 ++++-------------
1 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index a38ddad..c3ab456 100644
--- a/Documentation/DMA-API-HOWTO.txt
+++ b/Documentation/DMA-API-HOWTO.txt
@@ -703,19 +703,10 @@ to "Closing".

1) Struct scatterlist requirements.

- Struct scatterlist must contain, at a minimum, the following
- members:
-
- struct page *page;
- unsigned int offset;
- unsigned int length;
-
- The base address is specified by a "page+offset" pair.
-
- Previous versions of struct scatterlist contained a "void *address"
- field that was sometimes used instead of page+offset. As of Linux
- 2.5., page+offset is always used, and the "address" field has been
- deleted.
+ Don't invent the architecture specific struct scatterlist; just use
+ <asm-generic/scatterlist.h>. You need to enable
+ CONFIG_NEED_SG_DMA_LENGTH if the architecture supports IOMMUs
+ (including software IOMMU).

2) More to come...

--
1.6.5

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