linux-master/mm/memory.c

3246 	struct folio *old_folio = NULL;
3257 		old_folio = page_folio(vmf->page);
3280 			if (old_folio)
3281 				folio_put(old_folio);
3301 		if (old_folio) {
3302 			if (!folio_test_anon(old_folio)) {
3303 				dec_mm_counter(mm, mm_counter_file(old_folio));
3340 		if (old_folio) {
3363 			folio_remove_rmap_pte(old_folio, vmf->page, vma);
3367 		new_folio = old_folio;
3379 	if (old_folio) {
3381 			free_swap_cache(old_folio);
3382 		folio_put(old_folio);
3390 	if (old_folio)
3391 		folio_put(old_folio);