diff options
author | Jens Axboe <jens.axboe@oracle.com> | 2007-10-22 13:57:20 -0400 |
---|---|---|
committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-22 15:20:01 -0400 |
commit | 18dabf473e15850c0dbc8ff13ac1e2806d542c15 (patch) | |
tree | f6ce2fd3c7e3f9c2c7b4fbd9946199572bd9f622 /include/asm-frv/scatterlist.h | |
parent | 58b053e4ce9d2fc3023645c1b96e537c72aa8d9a (diff) |
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-frv/scatterlist.h')
-rw-r--r-- | include/asm-frv/scatterlist.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-frv/scatterlist.h b/include/asm-frv/scatterlist.h index 8e827fa853f1..53dade7b2e16 100644 --- a/include/asm-frv/scatterlist.h +++ b/include/asm-frv/scatterlist.h | |||
@@ -22,7 +22,7 @@ | |||
22 | * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens | 22 | * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens |
23 | */ | 23 | */ |
24 | struct scatterlist { | 24 | struct scatterlist { |
25 | struct page *page; /* Location for highmem page, if any */ | 25 | unsigned long page_link; |
26 | unsigned int offset; /* for highmem, page offset */ | 26 | unsigned int offset; /* for highmem, page offset */ |
27 | 27 | ||
28 | dma_addr_t dma_address; | 28 | dma_addr_t dma_address; |