boot failure with __iounmap changes in v3.3

I'm working on getting out of tree support for the NXP LPC31xx ARM926EJS based CPUs ready for submission. Everything was working fine on v3.2 but I lost the ability to boot with v3.3. The boot failure is very early in the boot process. I did a bisect and came up with:

[6ee723a6570a897208b76ab3e9a495e9106b2f8c] ARM: simplify __iounmap() when dealing with section based mapping

I tried to revert it but there have been a bunch of edits in this file. Not sure how to go about debugging this.