| commit | 3be6cbd73f74b4a3da82cc7d6e1688a4ae595fc7 | |
| author | Jeff Garzik <jeff@garzik.org> | |
| Thu, 18 Oct 2007 20:21:18 +0000 (18 16:21 -0400) | ||
| committer | Jeff Garzik <jeff@garzik.org> | |
| Thu, 18 Oct 2007 20:21:18 +0000 (18 16:21 -0400) | ||
| tree | a077cf70d1cd438db34f5def23dd8f72f42b5a8c | treesnapshot (tar.gz zip) |
| parent | 858c9c406688bc7244986b5836265071edfd1d3f | commitdiff |
[libata] kill ata_sg_is_last()
Short term, this works around a bug introduced by early sg-chaining
work.
Long term, removing this function eliminates a branch from a hot
path loop in each scatter/gather table build. Also, as this code
demonstrates, we don't need to _track_ the end of the s/g list, as
long as we mark it in some way. And doing so programatically is nice.
So its a useful cleanup, regardless of its short term effects.
Based conceptually on a quick patch by Jens Axboe.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Short term, this works around a bug introduced by early sg-chaining
work.
Long term, removing this function eliminates a branch from a hot
path loop in each scatter/gather table build. Also, as this code
demonstrates, we don't need to _track_ the end of the s/g list, as
long as we mark it in some way. And doing so programatically is nice.
So its a useful cleanup, regardless of its short term effects.
Based conceptually on a quick patch by Jens Axboe.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>