int rc = 0;
int *result = NULL;
struct page *newpage = get_new_page(page, private, &result);
+ int rcu_locked = 0;
if (!newpage)
return -ENOMEM;
* we cannot notice that anon_vma is freed while we migrates a page.
* This rcu_read_lock() delays freeing anon_vma pointer until the end
* of migration. File cache pages are no problem because of page_lock()
+ * File Caches may use write_page() or lock_page() in migration, then,
+ * just care Anon page here.
*/
- rcu_read_lock();
+ if (PageAnon(page)) {
+ rcu_read_lock();
+ rcu_locked = 1;
+ }
/*
* This is a corner case handling.
* When a new swap-cache is read into, it is linked to LRU
if (rc)
remove_migration_ptes(page, page);
rcu_unlock:
- rcu_read_unlock();
+ if (rcu_locked)
+ rcu_read_unlock();
unlock: