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 <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: "Liam R. Howlett" <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Zi Yan <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Nico Pache <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Dev Jain <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Oscar Salvador <[email protected]>
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
