With the Linux 2.6.26-rc4 kernel announcement
Linus Torvalds goes on a bit of a rant surrounding users with a 32-bit x86 kernel but using PAE/HIGHMEM64G for supporting a greater memory capacity in excess of 4GB, but when you should be using the x86_64 kernel. However, for those of you in this situation, the Linux 2.6.26-rc4 kernel has a fix that should prevent some headaches caused by fallout from the recent PAT fix/cleanup patches.
Aside from the fix for HIGHMEM64G users, the Linux 2.6.26-rc4 kernel has many driver updates along with CIFS/NFS/arch changes. This release does revert the DRM / vBlank work due to some unexpected fallout.