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authorJens Axboe <jens.axboe@oracle.com>2007-10-22 13:57:20 -0400
committerJens Axboe <jens.axboe@oracle.com>2007-10-22 15:20:01 -0400
commit18dabf473e15850c0dbc8ff13ac1e2806d542c15 (patch)
treef6ce2fd3c7e3f9c2c7b4fbd9946199572bd9f622 /include/asm-x86/scatterlist_32.h
parent58b053e4ce9d2fc3023645c1b96e537c72aa8d9a (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-x86/scatterlist_32.h')
-rw-r--r--include/asm-x86/scatterlist_32.h2
1 files changed, 1 insertions, 1 deletions
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 @@
4#include <asm/types.h> 4#include <asm/types.h>
5 5
6struct scatterlist { 6struct scatterlist {
7 struct page *page; 7 unsigned long page_link;
8 unsigned int offset; 8 unsigned int offset;
9 dma_addr_t dma_address; 9 dma_addr_t dma_address;
10 unsigned int length; 10 unsigned int length;