[merged mm-stable] mm-filemap-map-entire-large-folio-faultaround.patch removed from -mm tree

[merged mm-stable] mm-filemap-map-entire-large-folio-faultaround.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/filemap: map entire large folio faultaround
has been removed from the -mm tree.  Its filename was
     mm-filemap-map-entire-large-folio-faultaround.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: Kiryl Shutsemau <kas@kernel.org>
Subject: mm/filemap: map entire large folio faultaround
Date: Tue, 23 Sep 2025 12:07:10 +0100

Currently, kernel only maps part of large folio that fits into
start_pgoff/end_pgoff range.

Map entire folio where possible.  It will match finish_fault() behaviour
that user hits on cold page cache.

Mapping large folios at once will allow the rmap code to mlock it on add,
as it will recognize that it is fully mapped and mlocking is safe.

Link: https://lkml.kernel.org/r/20250923110711.690639-6-kirill@shutemov.name
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/filemap.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/mm/filemap.c~mm-filemap-map-entire-large-folio-faultaround
+++ a/mm/filemap.c
@@ -3670,6 +3670,21 @@ static vm_fault_t filemap_map_folio_rang
 	struct page *page = folio_page(folio, start);
 	unsigned int count = 0;
 	pte_t *old_ptep = vmf->pte;
+	unsigned long addr0;
+
+	/*
+	 * Map the large folio fully where possible.
+	 *
+	 * The folio must not cross VMA or page table boundary.
+	 */
+	addr0 = addr - start * PAGE_SIZE;
+	if (folio_within_vma(folio, vmf->vma) &&
+	    (addr0 & PMD_MASK) == ((addr0 + folio_size(folio) - 1) & PMD_MASK)) {
+		vmf->pte -= start;
+		page -= start;
+		addr = addr0;
+		nr_pages = folio_nr_pages(folio);
+	}
 
 	do {
 		if (PageHWPoison(page + count))
_

Patches currently in -mm which might be from kas@kernel.org are