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

[David Hildenbrand <david@redhat.com>]

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@linux-foundation.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>

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