[merged mm-stable] mm-shmem-update-shmem-handler-to-the-mf_delayed-definition.patch removed from -mm tree

[merged mm-stable] mm-shmem-update-shmem-handler-to-the-mf_delayed-definition.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: shmem: Update shmem handler to the MF_DELAYED definition
has been removed from the -mm tree.  Its filename was
     mm-shmem-update-shmem-handler-to-the-mf_delayed-definition.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: Lisa Wang <wyihan@google.com>
Subject: mm: shmem: Update shmem handler to the MF_DELAYED definition
Date: Thu, 17 Sep 2026 20:43:49 +0000

To align with the definition of MF_DELAYED, update
shmem_error_remove_folio() to return MF_DELAYED.

shmem handles memory failures but defers the actual file truncation.  The
function's return value should therefore be MF_DELAYED to accurately
reflect the state.

Currently, this logical error does not cause a bug, because:

- For shmem folios, folio->private is not set.
- As a result, filemap_release_folio() is a no-op and returns true.
- This, in turn, causes truncate_error_folio() to incorrectly return
  MF_RECOVERED.
- The caller then treats MF_RECOVERED as a success condition, masking the
  issue.

The previous patch relays MF_DELAYED to the caller of
truncate_error_folio() before any logging, so returning MF_DELAYED from
shmem_error_remove_folio() will retain the original behavior of not adding
any logs.

The return value of truncate_error_folio() is consumed in action_result(),
which treats MF_DELAYED the same way as MF_RECOVERED, hence
action_result() also returns the same thing after this change.

Link: https://lore.kernel.org/20260917-memory-failure-mf-delayed-fix-v6-3-4b00856b5364@google.com
Signed-off-by: Lisa Wang <wyihan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Fuad Tabba <tabba@google.com>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Isaku Yamahata <isaku.yamahata@intel.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vishal Annapurve <vannapurve@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Yu Zhang <yu.c.zhang@linux.intel.com>
---

 mm/shmem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/shmem.c~mm-shmem-update-shmem-handler-to-the-mf_delayed-definition
+++ a/mm/shmem.c
@@ -5363,7 +5363,7 @@ static void __init shmem_destroy_inodeca
 static int shmem_error_remove_folio(struct address_space *mapping,
 				   struct folio *folio)
 {
-	return 0;
+	return MF_DELAYED;
 }
 
 static const struct address_space_operations shmem_aops = {
_

Patches currently in -mm which might be from wyihan@google.com are