99 	struct page *page;  in __try_to_reclaim_swap()  local
102 	page = find_get_page(swap_address_space(entry), entry.val);  in __try_to_reclaim_swap()
103 	if (!page)  in __try_to_reclaim_swap()
112 	if (trylock_page(page)) {  in __try_to_reclaim_swap()
113 		ret = try_to_free_swap(page);  in __try_to_reclaim_swap()
114 		unlock_page(page);  in __try_to_reclaim_swap()
116 	page_cache_release(page);  in __try_to_reclaim_swap()
862 int page_swapcount(struct page *page)  in page_swapcount()  argument
868 	entry.val = page_private(page);  in page_swapcount()
883 int reuse_swap_page(struct page *page)  in reuse_swap_page()  argument
887 	VM_BUG_ON_PAGE(!PageLocked(page), page);  in reuse_swap_page()
888 	if (unlikely(PageKsm(page)))  in reuse_swap_page()
890 	count = page_mapcount(page);  in reuse_swap_page()
891 	if (count <= 1 && PageSwapCache(page)) {  in reuse_swap_page()
892 		count += page_swapcount(page);  in reuse_swap_page()
893 		if (count == 1 && !PageWriteback(page)) {  in reuse_swap_page()
894 			delete_from_swap_cache(page);  in reuse_swap_page()
895 			SetPageDirty(page);  in reuse_swap_page()
905 int try_to_free_swap(struct page *page)  in try_to_free_swap()  argument
907 	VM_BUG_ON_PAGE(!PageLocked(page), page);  in try_to_free_swap()
909 	if (!PageSwapCache(page))  in try_to_free_swap()
911 	if (PageWriteback(page))  in try_to_free_swap()
913 	if (page_swapcount(page))  in try_to_free_swap()
934 	delete_from_swap_cache(page);  in try_to_free_swap()
935 	SetPageDirty(page);  in try_to_free_swap()
946 	struct page *page = NULL;  in free_swap_and_cache()  local
954 			page = find_get_page(swap_address_space(entry),  in free_swap_and_cache()
956 			if (page && !trylock_page(page)) {  in free_swap_and_cache()
957 				page_cache_release(page);  in free_swap_and_cache()
958 				page = NULL;  in free_swap_and_cache()
963 	if (page) {  in free_swap_and_cache()
968 		if (PageSwapCache(page) && !PageWriteback(page) &&  in free_swap_and_cache()
969 				(!page_mapped(page) || vm_swap_full())) {  in free_swap_and_cache()
970 			delete_from_swap_cache(page);  in free_swap_and_cache()
971 			SetPageDirty(page);  in free_swap_and_cache()
973 		unlock_page(page);  in free_swap_and_cache()
974 		page_cache_release(page);  in free_swap_and_cache()
1093 		unsigned long addr, swp_entry_t entry, struct page *page)  in unuse_pte()  argument
1095 	struct page *swapcache;  in unuse_pte()
1101 	swapcache = page;  in unuse_pte()
1102 	page = ksm_might_need_to_copy(page, vma, addr);  in unuse_pte()
1103 	if (unlikely(!page))  in unuse_pte()
1106 	if (mem_cgroup_try_charge(page, vma->vm_mm, GFP_KERNEL, &memcg)) {  in unuse_pte()
1113 		mem_cgroup_cancel_charge(page, memcg);  in unuse_pte()
1120 	get_page(page);  in unuse_pte()
1122 		   pte_mkold(mk_pte(page, vma->vm_page_prot)));  in unuse_pte()
1123 	if (page == swapcache) {  in unuse_pte()
1124 		page_add_anon_rmap(page, vma, addr);  in unuse_pte()
1125 		mem_cgroup_commit_charge(page, memcg, true);  in unuse_pte()
1127 		page_add_new_anon_rmap(page, vma, addr);  in unuse_pte()
1128 		mem_cgroup_commit_charge(page, memcg, false);  in unuse_pte()
1129 		lru_cache_add_active_or_unevictable(page, vma);  in unuse_pte()
1136 	activate_page(page);  in unuse_pte()
1140 	if (page != swapcache) {  in unuse_pte()
1141 		unlock_page(page);  in unuse_pte()
1142 		put_page(page);  in unuse_pte()
1149 				swp_entry_t entry, struct page *page)  in unuse_pte_range()  argument
1172 			ret = unuse_pte(vma, pmd, addr, entry, page);  in unuse_pte_range()
1185 				swp_entry_t entry, struct page *page)  in unuse_pmd_range()  argument
1196 		ret = unuse_pte_range(vma, pmd, addr, next, entry, page);  in unuse_pmd_range()
1205 				swp_entry_t entry, struct page *page)  in unuse_pud_range()  argument
1216 		ret = unuse_pmd_range(vma, pud, addr, next, entry, page);  in unuse_pud_range()
1224 				swp_entry_t entry, struct page *page)  in unuse_vma()  argument
1230 	if (page_anon_vma(page)) {  in unuse_vma()
1231 		addr = page_address_in_vma(page, vma);  in unuse_vma()
1246 		ret = unuse_pud_range(vma, pgd, addr, next, entry, page);  in unuse_vma()
1254 				swp_entry_t entry, struct page *page)  in unuse_mm()  argument
1264 		activate_page(page);  in unuse_mm()
1265 		unlock_page(page);  in unuse_mm()
1267 		lock_page(page);  in unuse_mm()
1270 		if (vma->anon_vma && (ret = unuse_vma(vma, entry, page)))  in unuse_mm()
1341 	struct page *page;  in try_to_unuse()  local
1381 		page = read_swap_cache_async(entry,  in try_to_unuse()
1383 		if (!page) {  in try_to_unuse()
1421 		wait_on_page_locked(page);  in try_to_unuse()
1422 		wait_on_page_writeback(page);  in try_to_unuse()
1423 		lock_page(page);  in try_to_unuse()
1424 		wait_on_page_writeback(page);  in try_to_unuse()
1431 			retval = shmem_unuse(entry, page);  in try_to_unuse()
1438 			retval = unuse_mm(start_mm, entry, page);  in try_to_unuse()
1467 					retval = unuse_mm(mm, entry, page);  in try_to_unuse()
1483 			unlock_page(page);  in try_to_unuse()
1484 			page_cache_release(page);  in try_to_unuse()
1508 		     PageDirty(page) && PageSwapCache(page)) {  in try_to_unuse()
1513 			swap_writepage(page, &wbc);  in try_to_unuse()
1514 			lock_page(page);  in try_to_unuse()
1515 			wait_on_page_writeback(page);  in try_to_unuse()
1525 		if (PageSwapCache(page) &&  in try_to_unuse()
1526 		    likely(page_private(page) == entry.val))  in try_to_unuse()
1527 			delete_from_swap_cache(page);  in try_to_unuse()
1534 		SetPageDirty(page);  in try_to_unuse()
1535 		unlock_page(page);  in try_to_unuse()
1536 		page_cache_release(page);  in try_to_unuse()
1610 sector_t map_swap_page(struct page *page, struct block_device **bdev)  in map_swap_page()  argument
1613 	entry.val = page_private(page);  in map_swap_page()
2361 	struct page *page = NULL;  in SYSCALL_DEFINE2()  local
2416 	page = read_mapping_page(mapping, 0, swap_file);  in SYSCALL_DEFINE2()
2417 	if (IS_ERR(page)) {  in SYSCALL_DEFINE2()
2418 		error = PTR_ERR(page);  in SYSCALL_DEFINE2()
2421 	swap_header = kmap(page);  in SYSCALL_DEFINE2()
2553 	if (page && !IS_ERR(page)) {  in SYSCALL_DEFINE2()
2554 		kunmap(page);  in SYSCALL_DEFINE2()
2555 		page_cache_release(page);  in SYSCALL_DEFINE2()
2701 struct swap_info_struct *page_swap_info(struct page *page)  in page_swap_info()  argument
2703 	swp_entry_t swap = { .val = page_private(page) };  in page_swap_info()
2704 	BUG_ON(!PageSwapCache(page));  in page_swap_info()
2711 struct address_space *__page_file_mapping(struct page *page)  in __page_file_mapping()  argument
2713 	VM_BUG_ON_PAGE(!PageSwapCache(page), page);  in __page_file_mapping()
2714 	return page_swap_info(page)->swap_file->f_mapping;  in __page_file_mapping()
2718 pgoff_t __page_file_index(struct page *page)  in __page_file_index()  argument
2720 	swp_entry_t swap = { .val = page_private(page) };  in __page_file_index()
2721 	VM_BUG_ON_PAGE(!PageSwapCache(page), page);  in __page_file_index()
2744 	struct page *head;  in add_swap_count_continuation()
2745 	struct page *page;  in add_swap_count_continuation()  local
2746 	struct page *list_page;  in add_swap_count_continuation()
2754 	page = alloc_page(gfp_mask | __GFP_HIGHMEM);  in add_swap_count_continuation()
2778 	if (!page) {  in add_swap_count_continuation()
2824 	list_add_tail(&page->lru, &head->lru);  in add_swap_count_continuation()
2825 	page = NULL;			/* now it's attached, don't free it */  in add_swap_count_continuation()
2829 	if (page)  in add_swap_count_continuation()
2830 		__free_page(page);  in add_swap_count_continuation()
2845 	struct page *head;  in swap_count_continued()
2846 	struct page *page;  in swap_count_continued()  local
2856 	page = list_entry(head->lru.next, struct page, lru);  in swap_count_continued()
2857 	map = kmap_atomic(page) + offset;  in swap_count_continued()
2868 			page = list_entry(page->lru.next, struct page, lru);  in swap_count_continued()
2869 			BUG_ON(page == head);  in swap_count_continued()
2870 			map = kmap_atomic(page) + offset;  in swap_count_continued()
2874 			page = list_entry(page->lru.next, struct page, lru);  in swap_count_continued()
2875 			if (page == head)  in swap_count_continued()
2877 			map = kmap_atomic(page) + offset;  in swap_count_continued()
2882 		page = list_entry(page->lru.prev, struct page, lru);  in swap_count_continued()
2883 		while (page != head) {  in swap_count_continued()
2884 			map = kmap_atomic(page) + offset;  in swap_count_continued()
2887 			page = list_entry(page->lru.prev, struct page, lru);  in swap_count_continued()
2898 			page = list_entry(page->lru.next, struct page, lru);  in swap_count_continued()
2899 			BUG_ON(page == head);  in swap_count_continued()
2900 			map = kmap_atomic(page) + offset;  in swap_count_continued()
2907 		page = list_entry(page->lru.prev, struct page, lru);  in swap_count_continued()
2908 		while (page != head) {  in swap_count_continued()
2909 			map = kmap_atomic(page) + offset;  in swap_count_continued()
2913 			page = list_entry(page->lru.prev, struct page, lru);  in swap_count_continued()
2928 		struct page *head;  in free_swap_count_continuations()
2933 				struct page *page;  in free_swap_count_continuations()  local
2934 				page = list_entry(this, struct page, lru);  in free_swap_count_continuations()
2936 				__free_page(page);  in free_swap_count_continuations()