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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-10-22 19:57:20 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-22 21:20:01 +0200 |
| commit | 18dabf473e15850c0dbc8ff13ac1e2806d542c15 (patch) | |
| tree | f6ce2fd3c7e3f9c2c7b4fbd9946199572bd9f622 /include/asm-x86 | |
| parent | 58b053e4ce9d2fc3023645c1b96e537c72aa8d9a (diff) | |
| download | linux-18dabf473e15850c0dbc8ff13ac1e2806d542c15.tar.bz2 | |
Change table chaining layout
Change the page member of the scatterlist structure to be an unsigned
long, and encode more stuff in the lower bits:
- Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located
at sg + 1.
- Bit 0 set: this is a chain entry, the next real entry is at ->page_link
with the two low bits masked off.
- Bit 1 set: this is the final entry in the sg entry. sg_next() will return
NULL when passed such an entry.
It's thus important that sg table users use the proper accessors to get
and set the page member.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/asm-x86')
| -rw-r--r-- | include/asm-x86/dma-mapping_32.h | 4 | ||||
| -rw-r--r-- | include/asm-x86/scatterlist_32.h | 2 | ||||
| -rw-r--r-- | include/asm-x86/scatterlist_64.h | 2 |
3 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-x86/dma-mapping_32.h b/include/asm-x86/dma-mapping_32.h index 6a2d26cb5da6..55f01bd9e556 100644 --- a/include/asm-x86/dma-mapping_32.h +++ b/include/asm-x86/dma-mapping_32.h @@ -45,9 +45,9 @@ dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, WARN_ON(nents == 0 || sglist[0].length == 0); for_each_sg(sglist, sg, nents, i) { - BUG_ON(!sg->page); + BUG_ON(!sg_page(sg)); - sg->dma_address = page_to_phys(sg->page) + sg->offset; + sg->dma_address = sg_phys(sg); } flush_write_buffers(); diff --git a/include/asm-x86/scatterlist_32.h b/include/asm-x86/scatterlist_32.h index bd5164aa8f63..140a5b37fa77 100644 --- a/include/asm-x86/scatterlist_32.h +++ b/include/asm-x86/scatterlist_32.h @@ -4,7 +4,7 @@ #include <asm/types.h> struct scatterlist { - struct page *page; + unsigned long page_link; unsigned int offset; dma_addr_t dma_address; unsigned int length; diff --git a/include/asm-x86/scatterlist_64.h b/include/asm-x86/scatterlist_64.h index ef3986ba4b79..e3447846e03d 100644 --- a/include/asm-x86/scatterlist_64.h +++ b/include/asm-x86/scatterlist_64.h @@ -4,7 +4,7 @@ #include <asm/types.h> struct scatterlist { - struct page *page; + unsigned long page_link; unsigned int offset; unsigned int length; dma_addr_t dma_address; |