The quilt patch titled
Subject: mm: remove stale example from comment
has been removed from the -mm tree. Its filename was
mm-remove-stale-example-from-comment.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: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: remove stale example from comment
Date: Mon, 11 Dec 2023 16:22:10 +0000
folio_add_new_anon_rmap() no longer works this way, so just remove the
entire example.
Link: https://lkml.kernel.org/r/20231211162214.2146080-6-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memremap.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
--- a/mm/memremap.c~mm-remove-stale-example-from-comment
+++ a/mm/memremap.c
@@ -473,21 +473,11 @@ void free_zone_device_page(struct page *
__ClearPageAnonExclusive(page);
/*
- * When a device managed page is freed, the page->mapping field
+ * When a device managed page is freed, the folio->mapping field
* may still contain a (stale) mapping value. For example, the
- * lower bits of page->mapping may still identify the page as an
- * anonymous page. Ultimately, this entire field is just stale
- * and wrong, and it will cause errors if not cleared. One
- * example is:
- *
- * migrate_vma_pages()
- * migrate_vma_insert_page()
- * page_add_new_anon_rmap()
- * __page_set_anon_rmap()
- * ...checks page->mapping, via PageAnon(page) call,
- * and incorrectly concludes that the page is an
- * anonymous page. Therefore, it incorrectly,
- * silently fails to set up the new anon rmap.
+ * lower bits of folio->mapping may still identify the folio as an
+ * anonymous folio. Ultimately, this entire field is just stale
+ * and wrong, and it will cause errors if not cleared.
*
* For other types of ZONE_DEVICE pages, migration is either
* handled differently or not done at all, so there is no need
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-remove-inc-dec-lruvec-page-state-functions.patch
slub-use-alloc_pages_node-in-alloc_slab_page.patch
slub-use-folio-apis-in-free_large_kmalloc.patch
slub-use-a-folio-in-__kmalloc_large_node.patch
mm-khugepaged-use-a-folio-more-in-collapse_file.patch
mm-memcontrol-remove-__mod_lruvec_page_state.patch
