Based on mm/mm-unstable.
While working on improving vm_normal_page() and friends, I stumbled
over this issues: refcounted "normal" folios must not be marked
using pmd_special() / pud_special(). Otherwise, we're effectively telling
the system that these folios are no "normal", violating the rules we
documented for vm_normal_page().
Fortunately, there are not many pmd_special()/pud_special() users yet.
So far there doesn't seem to be serious damage.
Tested using the ndctl tests ("ndctl:dax" suite).
v2 -> v3:
* Added tags (thanks for all the review!)
* Smaller fixups (add empty lines) and patch description improvements
v1 -> v2:
* "mm/huge_memory: don't ignore queried cachemode in vmf_insert_pfn_pud()"
-> Added after stumbling over that
* Modified the other tests to reuse the existing function by passing a
new struct
* Renamed the patches to talk about "folios" instead of pages and adjusted
the patch descriptions
* Dropped RB/TB from Dan and Oscar due to the changes
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Alistair Popple <apop...@nvidia.com>
Cc: Lorenzo Stoakes <lorenzo.stoa...@oracle.com>
Cc: "Liam R. Howlett" <liam.howl...@oracle.com>
Cc: Vlastimil Babka <vba...@suse.cz>
Cc: Mike Rapoport <r...@kernel.org>
Cc: Suren Baghdasaryan <sur...@google.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Zi Yan <z...@nvidia.com>
Cc: Baolin Wang <baolin.w...@linux.alibaba.com>
Cc: Nico Pache <npa...@redhat.com>
Cc: Ryan Roberts <ryan.robe...@arm.com>
Cc: Dev Jain <dev.j...@arm.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Oscar Salvador <osalva...@suse.de>
David Hildenbrand (3):
mm/huge_memory: don't ignore queried cachemode in vmf_insert_pfn_pud()
mm/huge_memory: don't mark refcounted folios special in
vmf_insert_folio_pmd()
mm/huge_memory: don't mark refcounted folios special in
vmf_insert_folio_pud()
include/linux/mm.h | 19 +++++++-
mm/huge_memory.c | 112 ++++++++++++++++++++++++++++-----------------
2 files changed, 87 insertions(+), 44 deletions(-)
--
2.49.0
