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authorJens Axboe <jens.axboe@oracle.com>2007-10-22 19:57:20 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-10-22 21:20:01 +0200
commit18dabf473e15850c0dbc8ff13ac1e2806d542c15 (patch)
treef6ce2fd3c7e3f9c2c7b4fbd9946199572bd9f622 /include/asm-sh
parentUpdate arch/ to use sg helpers (diff)
downloadlinux-dev-18dabf473e15850c0dbc8ff13ac1e2806d542c15.tar.xz
linux-dev-18dabf473e15850c0dbc8ff13ac1e2806d542c15.zip
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-sh')
-rw-r--r--include/asm-sh/scatterlist.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-sh/scatterlist.h b/include/asm-sh/scatterlist.h
index b9ae53c38365..bc7c809e16fb 100644
--- a/include/asm-sh/scatterlist.h
+++ b/include/asm-sh/scatterlist.h
@@ -4,7 +4,7 @@
#include <asm/types.h>
struct scatterlist {
- struct page * page; /* Location for highmem page, if any */
+ unsigned long page_link;
unsigned int offset;/* for highmem, page offset */
dma_addr_t dma_address;
unsigned int length;