mm-use-a-folio-in-the-softleaf_is_device_private-path.patch removed from -mm tree

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 <[email protected]>
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.

---

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

@@ -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 [email protected] 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