Tested the lates NVIDIA driver (346.35) today, and although it fixes the f_dentry error, the compile still fails with Kernel 3.19-rc4, due to the incompatible GPL problem:
FATAL: modpost: GPL-incompatible module nvidia.ko uses GPL-only symbol '__cachemode2pte_tbl' /usr/src/linux-3.19-rc4/scripts/Makefile.modpost:90: recipe for target '__modpost' failed
It has been pointed out that this can be fixed by simply changing the license type, but this is ‘illegal’, and not recommended..
Robert Gadsdon. January 17, 2015