The quilt patch titled
Subject: mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively
has been removed from the -mm tree. Its filename was
mm-rmap-use-page_move_anon_rmap-when-reusing-a-mapped-pageanon-page-exclusively.patch
This patch was dropped because it was merged into mm-stable
------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively
We want to mark anonymous pages exclusive, and when using
page_move_anon_rmap() we know that we are the exclusive user, as properly
documented. This is a preparation for marking anonymous pages exclusive
in page_move_anon_rmap().
In both instances, we're holding page lock and are sure that we're the
exclusive owner (page_count() == 1). hugetlb already properly uses
page_move_anon_rmap() in the write fault handler.
Note that in case of a PTE-mapped THP, we'll only end up calling this
function if the whole THP is only referenced by the single PTE mapping a
single subpage (page_count() == 1); consequently, it's fine to modify the
compound page mapping inside page_move_anon_rmap().
Link: https://lkml.kernel.org/r/20220428083441.37290-10-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Don Dutile <ddutile@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Liang Zhang <zhangliang5@xxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pedro Demarchi Gomes <pedrodemargomes@xxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 ++
mm/memory.c | 1 +
2 files changed, 3 insertions(+)
--- a/mm/huge_memory.c~mm-rmap-use-page_move_anon_rmap-when-reusing-a-mapped-pageanon-page-exclusively
+++ a/mm/huge_memory.c
@@ -1317,6 +1317,8 @@ vm_fault_t do_huge_pmd_wp_page(struct vm
try_to_free_swap(page);
if (page_count(page) == 1) {
pmd_t entry;
+
+ page_move_anon_rmap(page, vma);
entry = pmd_mkyoung(orig_pmd);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
if (pmdp_set_access_flags(vma, haddr, vmf->pmd, entry, 1))
--- a/mm/memory.c~mm-rmap-use-page_move_anon_rmap-when-reusing-a-mapped-pageanon-page-exclusively
+++ a/mm/memory.c
@@ -3303,6 +3303,7 @@ static vm_fault_t do_wp_page(struct vm_f
* and the page is locked, it's dark out, and we're wearing
* sunglasses. Hit it.
*/
+ page_move_anon_rmap(page, vma);
unlock_page(page);
wp_page_reuse(vmf);
return VM_FAULT_WRITE;
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
