+ mm-use-a-folio-in-the-softleaf_is_device_private-path.patch added to mm-new branch

The patch titled
     Subject: mm: use a folio in the softleaf_is_device_private path
has been added to the -mm mm-new branch.  Its filename is
     mm-use-a-folio-in-the-softleaf_is_device_private-path.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-use-a-folio-in-the-softleaf_is_device_private-path.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Hongfu Li <[email protected]>
Subject: mm: use a folio in the softleaf_is_device_private path
Date: Mon, 3 Aug 2026 11:15:54 +0800

Use the folio APIs in the device_private migration path of do_swap_page(),
replacing four calls to compound_head() with one.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Hongfu Li <[email protected]>
Acked-by: David Hildenbrand (Arm) <[email protected]>
Reviewed-by: Lorenzo Stoakes (ARM) <[email protected]>
Reviewed-by: Anshumman Khandual <[email protected]>
Cc: Hongfu Li <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 mm/memory.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/mm/memory.c~mm-use-a-folio-in-the-softleaf_is_device_private-path
+++ a/mm/memory.c
@@ -4922,18 +4922,19 @@ vm_fault_t do_swap_page(struct vm_fault
 				goto unlock;
 
 			/*
-			 * Get a page reference while we know the page can't be
+			 * 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);
+				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

selftests-mm-fix-memleak-in-migration-benchmark.patch
selftests-mm-factor-out-hmm_buffer_alloc-to-consolidate-buffer-setup.patch
selftests-mm-fix-bug_on-checking-wrong-variable-in-mremap_dontunmap.patch
mm-swap-fix-swap_cluster_lock-config_swap-stub-signature-mismatch.patch
mm-use-a-folio-in-the-softleaf_is_device_private-path.patch
selftests-prctl-fix-non-anonymous-vma-mapping-in-set-anon-vma-name-test.patch