Bug#1029968: Acknowledgement (bttv/v4l: WARNING: CPU: 6 PID: 6164 at mm/vmalloc.c:487 __vmap_pages_range_noflush+0x3e0/0x4d0)

[Dr. David Alan Gilbert]

Upstream 5.17 works
Upstream 5.18 fails

(with intel_iommu=on)

Let the bisect begin.

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