From: Jeff Garzik <jeff@garzik.org>
Date: Thu, 18 Oct 2007 20:21:18 +0000 (-0400)
Subject: [libata] kill ata_sg_is_last()
X-Git-Tag: v2.6.24-rc1~289^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3be6cbd73f74b4a3da82cc7d6e1688a4ae595fc7;p=pandora-kernel.git

[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>
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