[PATCH v2 00/19] mm: Support huge pfnmaps

[Jason Gunthorpe]

On Thu, Aug 29, 2024 at 12:21:39PM -0700, Jiaqi Yan wrote:

> I think we still want to attempt to SIGBUS userspace, regardless of
> doing unmap_mapping_range or not.

IMHO we need to eliminate this path if we actually want to keep things
mapped.

There is no way to generate the SIGBUS without poking a 4k hole in the
1G page, as only that 4k should get SIGBUS, every other byte of the 1G
is clean.

Jason