linux-master/mm/highmem.c

755 		struct page_address_map *pam;
757 		list_for_each_entry(pam, &pas->lh, list) {
758 			if (pam->page == page) {
759 				ret = pam->virtual;
779 	struct page_address_map *pam;
785 		pam = &page_address_maps[PKMAP_NR((unsigned long)virtual)];
786 		pam->page = page;
787 		pam->virtual = virtual;
790 		list_add_tail(&pam->list, &pas->lh);
794 		list_for_each_entry(pam, &pas->lh, list) {
795 			if (pam->page == page) {
796 				list_del(&pam->list);