bpf: Remove unnecessary type castings

Remove/clean up unnecessary void * type castings.

Signed-off-by: Yu Zhe <yuzhe@nfschina.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220413015048.12319-1-yuzhe@nfschina.com

Author: yuzhenfschina

kernel/bpf/bpf_struct_ops.c

@@ -263,7 +263,7 @@ int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
 	/* No lock is needed.  state and refcnt do not need
 	 * to be updated together under atomic context.
 	 */
-	uvalue = (struct bpf_struct_ops_value *)value;
+	uvalue = value;
 	memcpy(uvalue, st_map->uvalue, map->value_size);
 	uvalue->state = state;
 	refcount_set(&uvalue->refcnt, refcount_read(&kvalue->refcnt));
@@ -353,7 +353,7 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
 	if (err)
 		return err;
 
-	uvalue = (struct bpf_struct_ops_value *)value;
+	uvalue = value;
 	err = check_zero_holes(t, uvalue->data);
 	if (err)
 		return err;

kernel/bpf/hashtab.c

@@ -738,7 +738,7 @@ static void check_and_free_timer(struct bpf_htab *htab, struct htab_elem *elem)
  */
 static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node)
 {
-	struct bpf_htab *htab = (struct bpf_htab *)arg;
+	struct bpf_htab *htab = arg;
 	struct htab_elem *l = NULL, *tgt_l;
 	struct hlist_nulls_head *head;
 	struct hlist_nulls_node *n;