Where's CONFIG_4KSTACKS?

[Andy Ross]

Since early in the FC2 test cycle, the kernels have been built with
CONFIG_4KSTACKS.  As I'm sure all are aware, the nvidia binary module
doesn't work with this, so I've been building custom kernels.

Problem is, the option has *disappeared* from the 2.6.5-1.309 kernel.
How do I fix this, or am I SOL as far as testing goes?  Running
without 3D isn't an option, as I need to work on FlightGear.

Andy