copy_page_from_iter(): don't need kmap_atomic() for kvec/bvec cases

kmap_local_page() is enough.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

lib/iov_iter.c

@@ -871,9 +871,9 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
 	if (likely(iter_is_iovec(i)))
 		return copy_page_from_iter_iovec(page, offset, bytes, i);
 	if (iov_iter_is_bvec(i) || iov_iter_is_kvec(i) || iov_iter_is_xarray(i)) {
-		void *kaddr = kmap_atomic(page);
+		void *kaddr = kmap_local_page(page);
 		size_t wanted = _copy_from_iter(kaddr + offset, bytes, i);
-		kunmap_atomic(kaddr);
+		kunmap_local(kaddr);
 		return wanted;
 	}
 	WARN_ON(1);