include/uapi/linux/bpf.h

 union bpf_attr {
        struct { /* anonymous struct used by BPF_MAP_CREATE command */
@@ -113,7 +231,14 @@
                __u32   key_size;       /* size of key in bytes */
                __u32   value_size;     /* size of value in bytes */
                __u32   max_entries;    /* max number of entries in a map */
-               __u32   map_flags;      /* prealloc or not */
+               __u32   map_flags;      /* BPF_MAP_CREATE related
+                                        * flags defined above.
+                                        */
+               __u32   inner_map_fd;   /* fd pointing to the inner map */
+               __u32   numa_node;      /* numa node (effective only if
+                                        * BPF_F_NUMA_NODE is set).
+                                        */
+               char    map_name[BPF_OBJ_NAME_LEN];
        };