drm/i915: GEM on PAE has problems - disable it for now.

On PAE systems, GEM allocates pages using shmem, and passes these
pages to be bound into AGP, however the AGP interfaces + the x86
set_memory interfaces all take unsigned long not dma_addr_t.

The initial fix for this was a mess, so we need to do this correctly
for 2.6.29.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index adc972c..b3cc473 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -106,6 +106,8 @@
 typedef struct drm_i915_private {
 	struct drm_device *dev;
 
+	int has_gem;
+
 	void __iomem *regs;
 	drm_local_map_t *sarea;