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>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/asm-sh/scatterlist.h b/include/asm-sh/scatterlist.h
index b9ae53c..bc7c809 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;