The quilt patch titled
Subject: mm: use entire_mapcount in __page_dup_rmap()
has been removed from the -mm tree. Its filename was
mm-use-entire_mapcount-in-__page_dup_rmap.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: use entire_mapcount in __page_dup_rmap()
Date: Wed, 11 Jan 2023 14:28:57 +0000
Remove the use of the compound_mapcount_ptr() wrapper, and add an
assertion that we're not passing a tail page if we're duplicating a PMD.
Link: https://lkml.kernel.org/r/20230111142915.1001531-12-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/include/linux/rmap.h~mm-use-entire_mapcount-in-__page_dup_rmap
+++ a/include/linux/rmap.h
@@ -208,7 +208,14 @@ void hugepage_add_new_anon_rmap(struct p
static inline void __page_dup_rmap(struct page *page, bool compound)
{
- atomic_inc(compound ? compound_mapcount_ptr(page) : &page->_mapcount);
+ if (compound) {
+ struct folio *folio = (struct folio *)page;
+
+ VM_BUG_ON_PAGE(compound && !PageHead(page), page);
+ atomic_inc(&folio->_entire_mapcount);
+ } else {
+ atomic_inc(&page->_mapcount);
+ }
}
static inline void page_dup_file_rmap(struct page *page, bool compound)
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
