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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Apr 2025 06:09:55.6246 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2984443b-8969-46d6-2416-08dd7d7679b2 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: CY4PEPF0000E9D7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9039 Content-Type: text/plain; charset="utf-8" Export folio_expected_refs() to allow filesystem-specific migration handlers like JFS metapage_migrate_folio to properly verify reference counts before migration. Signed-off-by: Shivank Garg --- include/linux/migrate.h | 1 + mm/migrate.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index aaa2114498d6..cb31c5b1eb6a 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -60,6 +60,7 @@ struct movable_operations { /* Defined in mm/debug.c: */ extern const char *migrate_reason_names[MR_TYPES]; =20 +int folio_expected_refs(struct address_space *mapping, struct folio *folio= ); #ifdef CONFIG_MIGRATION =20 void putback_movable_pages(struct list_head *l); diff --git a/mm/migrate.c b/mm/migrate.c index 6e2488e5dbe4..0f01b8a87dec 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -445,7 +445,7 @@ void pmd_migration_entry_wait(struct mm_struct *mm, pmd= _t *pmd) } #endif =20 -static int folio_expected_refs(struct address_space *mapping, +int folio_expected_refs(struct address_space *mapping, struct folio *folio) { int refs =3D 1; @@ -458,6 +458,7 @@ static int folio_expected_refs(struct address_space *ma= pping, =20 return refs; } +EXPORT_SYMBOL_GPL(folio_expected_refs); =20 /* * Replace the folio in the mapping. --=20 2.34.1