[merged mm-stable] mm-madvise-skip-zone-device-folios-in-cold-pageout-pmd-range.patch removed from -mm tree

[merged mm-stable] mm-madvise-skip-zone-device-folios-in-cold-pageout-pmd-range.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/madvise: skip zone device folios in cold/pageout PMD range
has been removed from the -mm tree.  Its filename was
     mm-madvise-skip-zone-device-folios-in-cold-pageout-pmd-range.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Gregory Price <gourry@gourry.net>
Subject: mm/madvise: skip zone device folios in cold/pageout PMD range
Date: Mon, 17 Aug 2026 18:08:09 -0400

madvise_cold_or_pageout_pte_range() resolves the folio backing a PMD via
pmd_folio() and ages or reclaims it without checking for zone device
memory.

The surrounding guards do not cover every zone device case:

  - can_madv_lru_vma() excludes VM_PFNMAP and VM_HUGETLB VMAs
    (so device DAX is filtered)

  - !pmd_present() branch above rejects device-private and
    migration entries, which are non-present.

  - A present zone device PMD - e.g. a device-coherent THP - is
    not filtered by any of these, nor by pmd_folio() (unlike
    vm_normal_page_pmd(), it performs no special/pfnmap check),
    and would be aged or paged out here.

Skip ZONE_DEVICE folios explicitly during MADV_COLD/PAGEOUT.

Link: https://lore.kernel.org/20260817220810.1175596-3-gourry@gourry.net
Fixes: a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone device pages")
Signed-off-by: Gregory Price (Meta) <gourry@gourry.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Balbir Singh <balbirs@nvidia.com>
Tested-by: Lance Yang <lance.yang@linux.dev>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Jann Horn <jannh@google.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
---

 mm/madvise.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/madvise.c~mm-madvise-skip-zone-device-folios-in-cold-pageout-pmd-range
+++ a/mm/madvise.c
@@ -404,6 +404,9 @@ static int madvise_cold_or_pageout_pte_r
 
 		folio = pmd_folio(orig_pmd);
 
+		if (folio_is_zone_device(folio))
+			goto huge_unlock;
+
 		/* Do not interfere with other mappings of this folio */
 		if (folio_maybe_mapped_shared(folio))
 			goto huge_unlock;
_

Patches currently in -mm which might be from gourry@gourry.net are

mm-memory_hotplug-factor-out-node_is_memoryless.patch
mm-mempolicy-use-vm_normal_folio_pmd-in-queue_folios_pmd.patch
mm-madvise-use-vm_normal_folio_pmd-in-cold-pageout-pmd-range.patch
mm-refactor-find_next_best_node-to-find_next_best_node_in.patch
mm-page_alloc-refactor-build_node_zonelist-out-of-build_zonelists.patch
proc-task_mmu-handle-special-pmds-in-clear_refs-and-pagemap.patch
mm-madvise-reclaim-isolated-folios-if-pte-restart-fails.patch
mm-madvise-use-folio_trylock-in-the-cold-pageout-pmd-split.patch