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The warning was introduced by commit 7ee3647 ("migrate: Remove call to ->writepage") which added explicit warnings when filesystem don't implement migrate_folio. The syzbot reported following [1]: jfs_metapage_aops does not implement migrate_folio WARNING: CPU: 1 PID: 5861 at mm/migrate.c:955 fallback_migrate_folio mm/migrate.c:953 [inline] WARNING: CPU: 1 PID: 5861 at mm/migrate.c:955 move_to_new_folio+0x70e/0x840 mm/migrate.c:1007 Modules linked in: CPU: 1 UID: 0 PID: 5861 Comm: syz-executor280 Not tainted 6.15.0-rc1-next-20250411-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:fallback_migrate_folio mm/migrate.c:953 [inline] RIP: 0010:move_to_new_folio+0x70e/0x840 mm/migrate.c:1007 This Implement metapage_migrate_folio which handles both single and multiple metapages per page configurations. [1]: https://syzkaller.appspot.com/bug?extid=8bb6fd945af4e0ad9299 V1/V2: https://lore.kernel.org/all/20250413172356.561544-1-shivankg@amd.com #syz test: https://github.com/AMDESE/linux-mm.git 07246f14ea Best Regards, Shivank Shivank Garg (2): mm: export folio_expected_refs for JFS migration handler jfs: implement migrate_folio for jfs_metapage_aops fs/jfs/jfs_metapage.c | 94 +++++++++++++++++++++++++++++++++++++++++ include/linux/migrate.h | 1 + mm/migrate.c | 3 +- 3 files changed, 97 insertions(+), 1 deletion(-)