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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Apr 2025 11:40:56.9113 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ff105488-20c2-481d-f84d-08dd81928bfd X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYXPR12MB9426 This patch addresses a warning that occurs during memory compaction due to JFS's missing migrate_folio operation. The warning was introduced by commit 7ee3647243e5 ("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 Previous Versions: V1/V2: https://lore.kernel.org/all/20250413172356.561544-1-shivankg@amd.com V3: https://lore.kernel.org/all/20250417060630.197278-1-shivankg@amd.com #syz test: https://github.com/AMDESE/linux-mm.git f17a3b8bc 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(-) -- 2.34.1