> Commit dbe6ec815641 ("ext2/4, xfs: call thp_get_unmapped_area() for pmd
> mappings") adds the callback for DAX, that btrfs does not support so it
> was left out.
Commit 1854bc6e2420 ("mm/readahead: Align file mappings for non-DAX”) removed the DAX requirement.
We should now be able to call thp_get_unmapped_area() for btrfs.
I’ll send out a v3 with the subject and sign off corrected. Thanks!
