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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-ia64 | |
| parent | Update arch/ to use sg helpers (diff) | |
| download | linux-18dabf473e15850c0dbc8ff13ac1e2806d542c15.tar.xz linux-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-ia64')
| -rw-r--r-- | include/asm-ia64/scatterlist.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h index 7d5234d50312..2f76ce304964 100644 --- a/include/asm-ia64/scatterlist.h +++ b/include/asm-ia64/scatterlist.h @@ -9,7 +9,7 @@ #include <asm/types.h> struct scatterlist { - struct page *page; + unsigned long page_link; unsigned int offset; unsigned int length; /* buffer length */ |