On Fri, Sep 01, 2023 at 10:20:26AM +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 - it is the > case for guest memfd folios. > > Also incorporate comment update suggested by Matthew. In the meantime, 866ff80176aa went upstream earlier this merge window, so it's going to have some conflicts.