This is a note to let you know that I've just added the patch titled
mm/memory-failure: check the mapcount of the precise page
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-memory-failure-check-the-mapcount-of-the-precise-page.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c79c5a0a00a9457718056b588f312baadf44e471 Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Date: Mon, 18 Dec 2023 13:58:36 +0000
Subject: mm/memory-failure: check the mapcount of the precise page
From: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
commit c79c5a0a00a9457718056b588f312baadf44e471 upstream.
A process may map only some of the pages in a folio, and might be missed
if it maps the poisoned page but not the head page. Or it might be
unnecessarily hit if it maps the head page, but not the poisoned page.
Link: https://lkml.kernel.org/r/20231218135837.3310403-3-willy@xxxxxxxxxxxxx
Fixes: 7af446a841a2 ("HWPOISON, hugetlb: enable error handling path for hugepage")
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1421,7 +1421,7 @@ static bool hwpoison_user_mappings(struc
* This check implies we don't kill processes if their pages
* are in the swap cache early. Those are always late kills.
*/
- if (!page_mapped(hpage))
+ if (!page_mapped(p))
return true;
if (PageKsm(p)) {
@@ -1477,10 +1477,10 @@ static bool hwpoison_user_mappings(struc
try_to_unmap(folio, ttu);
}
- unmap_success = !page_mapped(hpage);
+ unmap_success = !page_mapped(p);
if (!unmap_success)
pr_err("%#lx: failed to unmap page (mapcount=%d)\n",
- pfn, page_mapcount(hpage));
+ pfn, page_mapcount(p));
/*
* try_to_unmap() might put mlocked page in lru cache, so call
Patches currently in stable-queue which might be from willy@xxxxxxxxxxxxx are
queue-6.1/mm-memory-failure-cast-index-to-loff_t-before-shifting-it.patch
queue-6.1/mm-filemap-avoid-buffered-read-write-race-to-read-inconsistent-data.patch
queue-6.1/mm-migrate-high-order-folios-in-swap-cache-correctly.patch
queue-6.1/mm-memory-failure-check-the-mapcount-of-the-precise-page.patch
