csum_and_copy_to_iter  264 include/linux/uio.h size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, struct iov_iter *i);
csum_and_copy_to_iter 1530 lib/iov_iter.c EXPORT_SYMBOL(csum_and_copy_to_iter);
csum_and_copy_to_iter  704 net/core/datagram.c 			csum_and_copy_to_iter, csump);