396 			       size_t len)  in memcpy_page()  argument
401 	VM_BUG_ON(dst_off + len > PAGE_SIZE || src_off + len > PAGE_SIZE);  in memcpy_page()
402 	memcpy(dst + dst_off, src + src_off, len);  in memcpy_page()
408 			       size_t len)  in memset_page()  argument
412 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memset_page()
413 	memset(addr + offset, val, len);  in memset_page()
418 				    size_t offset, size_t len)  in memcpy_from_page()  argument
422 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_from_page()
423 	memcpy(to, from + offset, len);  in memcpy_from_page()
428 				  const char *from, size_t len)  in memcpy_to_page()  argument
432 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_to_page()
433 	memcpy(to + offset, from, len);  in memcpy_to_page()
438 static inline void memzero_page(struct page *page, size_t offset, size_t len)  in memzero_page()  argument
442 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memzero_page()
443 	memset(addr + offset, 0, len);  in memzero_page()
456 		size_t offset, size_t len)  in memcpy_from_folio()  argument
458 	VM_BUG_ON(offset + len > folio_size(folio));  in memcpy_from_folio()
462 		size_t chunk = len;  in memcpy_from_folio()
472 		len -= chunk;  in memcpy_from_folio()
473 	} while (len > 0);  in memcpy_from_folio()
484 		const char *from, size_t len)  in memcpy_to_folio()  argument
486 	VM_BUG_ON(offset + len > folio_size(folio));  in memcpy_to_folio()
490 		size_t chunk = len;  in memcpy_to_folio()
500 		len -= chunk;  in memcpy_to_folio()
501 	} while (len > 0);  in memcpy_to_folio()
523 	size_t len = folio_size(folio) - offset;  in folio_zero_tail()  local
528 		while (len > max) {  in folio_zero_tail()
531 			len -= max;  in folio_zero_tail()
538 	memset(kaddr, 0, len);  in folio_zero_tail()
557 		const char *from, size_t len)  in folio_fill_tail()  argument
561 	VM_BUG_ON(offset + len > folio_size(folio));  in folio_fill_tail()
566 		while (len > max) {  in folio_fill_tail()
569 			len -= max;  in folio_fill_tail()
577 	memcpy(to, from, len);  in folio_fill_tail()
578 	to = folio_zero_tail(folio, offset + len, to + len);  in folio_fill_tail()
595 		loff_t pos, size_t len)  in memcpy_from_file_folio()  argument
602 		len = min_t(size_t, len, PAGE_SIZE - offset);  in memcpy_from_file_folio()
604 		len = min(len, folio_size(folio) - offset);  in memcpy_from_file_folio()
606 	memcpy(to, from, len);  in memcpy_from_file_folio()
609 	return len;  in memcpy_from_file_folio()