csum_and_copy_from_iter  265 include/linux/uio.h size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);
csum_and_copy_from_iter 1442 lib/iov_iter.c EXPORT_SYMBOL(csum_and_copy_from_iter);