[merged mm-stable] mm-use-a-folio-in-the-softleaf_is_device_private-path.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: mm: use a folio in the softleaf_is_device_private path
has been removed from the -mm tree.  Its filename was
     mm-use-a-folio-in-the-softleaf_is_device_private-path.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: Hongfu Li <lihongfu@kylinos.cn>
Subject: mm: use a folio in the softleaf_is_device_private path
Date: Wed, 19 Aug 2026 17:51:43 +0800

Use the folio APIs in the device_private migration path of do_swap_page(),
replacing four calls to compound_head() with two page_folio() calls.  The
second one re-fetches the folio from vmf->page after migrate_to_ram(),
which might have split the folio.

Link: https://lore.kernel.org/20260819095144.45660-1-hongfu.li@linux.dev
Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: David Hildenbrand (Arm) <david@kernel.org>
Link: https://lore.kernel.org/all/e20678ed-3fa1-4677-a1d7-e2af481e8302@kernel.org/
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
---

 mm/memory.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/mm/memory.c~mm-use-a-folio-in-the-softleaf_is_device_private-path
+++ a/mm/memory.c
@@ -4926,18 +4926,21 @@ vm_fault_t do_swap_page(struct vm_fault
 				goto unlock;
 
 			/*
-			 * Get a page reference while we know the page can't be
-			 * freed.
+			 * Get a folio reference while we know the folio can't
+			 * be freed.
 			 */
-			if (trylock_page(vmf->page)) {
+			folio = page_folio(vmf->page);
+			if (folio_trylock(folio)) {
 				struct dev_pagemap *pgmap;
 
-				get_page(vmf->page);
+				folio_get(folio);
 				pte_unmap_unlock(vmf->pte, vmf->ptl);
 				pgmap = page_pgmap(vmf->page);
 				ret = pgmap->ops->migrate_to_ram(vmf);
-				unlock_page(vmf->page);
-				put_page(vmf->page);
+				/* migrate_to_ram() might have split the folio. */
+				folio = page_folio(vmf->page);
+				folio_unlock(folio);
+				folio_put(folio);
 			} else {
 				pte_unmap(vmf->pte);
 				softleaf_entry_wait_on_locked(entry, vmf->ptl);
_

Patches currently in -mm which might be from lihongfu@kylinos.cn are

mm-page_owner-preserve-original-free_pid-free_tgid-during-folio-migration.patch
mm-memfd-fix-hugetlb-reservation-accounting-in-error-paths.patch
selftests-mm-fix-ptrace-peekdata-check-in-memfd_secret-test.patch
mm-hugetlb_cgroup-move-per-node-usage-on-cross-node-migration.patch
mm-hugetlb_cgroup-move-per-node-usage-on-cgroup-reparenting.patch
mm-hugetlb-account-migration-target-folio-in-per-node-nr_hugetlb-vmstat.patch
mm-memcg-migrate-per-node-hugetlb-lruvec-stat-together-with-hugetlb-folio.patch