The quilt patch titled
Subject: mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio()
has been removed from the -mm tree. Its filename was
mm-debug-print-only-page-mapcount-excluding-folio-entire-mapcount-in-__dump_folio.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: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio()
Date: Tue, 9 Apr 2024 21:23:00 +0200
Let's simplify and only print the page mapcount: we already print the
large folio mapcount and the entire folio mapcount for large folios
separately; that should be sufficient to figure out what's happening.
While at it, print the page mapcount also if it had an underflow,
filtering out only typed pages.
Link: https://lkml.kernel.org/r/20240409192301.907377-18-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Richard Chang <richardycc@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/debug.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
--- a/mm/debug.c~mm-debug-print-only-page-mapcount-excluding-folio-entire-mapcount-in-__dump_folio
+++ a/mm/debug.c
@@ -55,15 +55,10 @@ static void __dump_folio(struct folio *f
unsigned long pfn, unsigned long idx)
{
struct address_space *mapping = folio_mapping(folio);
- int mapcount = atomic_read(&page->_mapcount) + 1;
+ int mapcount = atomic_read(&page->_mapcount);
char *type = "";
- /* Open-code page_mapcount() to avoid looking up a stale folio */
- if (mapcount < 0)
- mapcount = 0;
- if (folio_test_large(folio))
- mapcount += folio_entire_mapcount(folio);
-
+ mapcount = page_type_has_type(mapcount) ? 0 : mapcount + 1;
pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
folio_ref_count(folio), mapcount, mapping,
folio->index + idx, pfn);
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
