The patch titled
Subject: mm: shmem: remove unnecessary warning in shmem_writepage()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-shmem-remove-unnecessary-warning-in-shmem_writepage.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-shmem-remove-unnecessary-warning-in-shmem_writepage.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Ricardo Cañuelo Navarro <rcn@xxxxxxxxxx>
Subject: mm: shmem: remove unnecessary warning in shmem_writepage()
Date: Wed, 26 Feb 2025 13:26:27 +0100
Although the scenario where shmem_writepage() is called with info->flags &
VM_LOCKED is unlikely to happen, it's still possible, as evidenced by
syzbot [1]. However, the warning in this case isn't necessary because the
situation is already handled correctly [2].
[2] https://lore.kernel.org/lkml/8afe1f7f-31a2-4fc0-1fbd-f9ba8a116fe3@xxxxxxxxxx/
Link: https://lkml.kernel.org/r/20250226-20250221-warning-in-shmem_writepage-v1-1-5ad19420e17e@xxxxxxxxxx
Fixes: 9a976f0c847b ("shmem: skip page split if we're not reclaiming")
Signed-off-by: Ricardo Cañuelo Navarro <rcn@xxxxxxxxxx>
Reported-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
Closes: https://lore.kernel.org/lkml/ZZ9PShXjKJkVelNm@xxxxxxxxxxxxxxxx/ [1]
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Florent Revest <revest@xxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Florent Revest <revest@xxxxxxxxxxxx>
Cc: Luis Chamberalin <mcgrof@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/shmem.c~mm-shmem-remove-unnecessary-warning-in-shmem_writepage
+++ a/mm/shmem.c
@@ -1548,7 +1548,7 @@ static int shmem_writepage(struct page *
if (WARN_ON_ONCE(!wbc->for_reclaim))
goto redirty;
- if (WARN_ON_ONCE((info->flags & VM_LOCKED) || sbinfo->noswap))
+ if ((info->flags & VM_LOCKED) || sbinfo->noswap)
goto redirty;
if (!total_swap_pages)
_
Patches currently in -mm which might be from rcn@xxxxxxxxxx are
mm-shmem-remove-unnecessary-warning-in-shmem_writepage.patch
