From: Dan Williams <dan.j.williams@intel.com>
Date: Thu, 9 Jun 2011 23:04:28 +0000 (-0700)
Subject: isci: cleanup/optimize queue increment macros
X-Git-Tag: v3.0-rc6~1^2~1^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=994a9303d33f8238d57f58c26067b6d4ac9af222;p=pandora-kernel.git

isci: cleanup/optimize queue increment macros

Every single i/o or event completion incurs a test and branch to see if
the cycle bit changed.  For power-of-2 queue sizes the cycle bit can be
read directly from the rollover of the queue pointer.

Likely premature optimization, but the hidden if() and hidden
assignments / side-effects in the macros were already asking to be
cleaned up.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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