diff options
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 7ccf763bb30..4fe7e3aa02e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -700,7 +700,7 @@ int migrate_page_remove_references(struct page *newpage, * the page. */ if (!mapping || page_mapcount(page) + nr_refs != page_count(page)) - return 1; + return -EAGAIN; /* * Establish swap ptes for anonymous pages or destroy pte @@ -721,13 +721,15 @@ int migrate_page_remove_references(struct page *newpage, * If the page was not migrated then the PageSwapCache bit * is still set and the operation may continue. */ - try_to_unmap(page, 1); + if (try_to_unmap(page, 1) == SWAP_FAIL) + /* A vma has VM_LOCKED set -> Permanent failure */ + return -EPERM; /* * Give up if we were unable to remove all mappings. */ if (page_mapcount(page)) - return 1; + return -EAGAIN; write_lock_irq(&mapping->tree_lock); @@ -738,7 +740,7 @@ int migrate_page_remove_references(struct page *newpage, if (!page_mapping(page) || page_count(page) != nr_refs || *radix_pointer != page) { write_unlock_irq(&mapping->tree_lock); - return 1; + return -EAGAIN; } /* @@ -813,10 +815,14 @@ EXPORT_SYMBOL(migrate_page_copy); */ int migrate_page(struct page *newpage, struct page *page) { + int rc; + BUG_ON(PageWriteback(page)); /* Writeback must be complete */ - if (migrate_page_remove_references(newpage, page, 2)) - return -EAGAIN; + rc = migrate_page_remove_references(newpage, page, 2); + + if (rc) + return rc; migrate_page_copy(newpage, page); |