Bug#1078124: Proposed patch

[Gianluigi Tiesi]

this is the proposed patch, it was extracted and adapted from upstream
open source kernel module at
this commit:

https://github.com/NVIDIA/open-gpu-kernel-modules/commit/74ee05e16071354faaaaa68b25461c5a62529dc1

tested with 6.10.3 using nvidia 535.183.01

perhaps follow_pte was already gpl only in 6.9.12 but still compiles
for some reason

the currently implementation of nv_follow_pfn() returns -1, but the
same is for new nvidia version
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