[PATCH gmem FIXUP v2] mm, compaction: make testing mapping_unmovable() safe

[Sean Christopherson]

On Fri, 08 Sep 2023 09:42:23 +0200, Vlastimil Babka wrote:
> As Kirill pointed out, mapping can be removed under us due to
> truncation. Test it under folio lock as already done for the async
> compaction / dirty folio case. To prevent locking every folio with
> mapping to do the test, do it only for unevictable folios, as we can
> expect the unmovable mapping folios are also unevictable. To enforce
> that expecation, make mapping_set_unmovable() also set AS_UNEVICTABLE.
> 
> [...]

Applied to kvm-x86 guest_memfd, thanks!

[1/1] mm, compaction: make testing mapping_unmovable() safe
      https://github.com/kvm-x86/linux/commit/4876a35647b9

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