From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 22 Oct 2007 17:57:20 +0000 (+0200)
Subject: Change table chaining layout
X-Git-Tag: v2.6.24-rc1~71^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18dabf473e15850c0dbc8ff13ac1e2806d542c15;p=pandora-kernel.git

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>
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