On Fri, Jan 29, 2021 at 04:13:07PM -0800, Minchan Kim wrote:
> A custom driver overrides (vm_operations_struct.fault) and map their
> compound page(__GFP_COMP) to page table on userprocess on demand.
You're looking to backport:
commit d01ac3c35214ce362f50cada37cb7bab8c801896
Author: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Date: Thu Oct 15 20:05:26 2020 -0700
mm/memory: remove page fault assumption of compound page size
