[PATCH v1 0/2] mm/huge_memory: don't mark refcounted pages special in vmf_insert_folio_*()

[David Hildenbrand]

Based on Linus' master.

While working on improving vm_normal_page() and friends, I stumbled
over this issues: refcounted "normal" pages must not be marked
using pmd_special() / pud_special().

Fortunately, so far there doesn't seem to be serious damage.

This is only compile-tested so far. Still looking for an easy way to test
PMD/PUD mappings with DAX. Any tests I can easily run?

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Nico Pache <npache@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Dev Jain <dev.jain@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>

David Hildenbrand (2):
  mm/huge_memory: don't mark refcounted pages special in
    vmf_insert_folio_pmd()
  mm/huge_memory: don't mark refcounted pages special in
    vmf_insert_folio_pud()

 include/linux/mm.h | 15 ++++++++++
 mm/huge_memory.c   | 72 +++++++++++++++++++++++++++++++++++-----------
 2 files changed, 70 insertions(+), 17 deletions(-)


base-commit: a9dfb7db96f7bc1f30feae673aab7fdbfbc94e9c
-- 
2.49.0