--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
-@@ -1812,27 +1812,7 @@ void netlink_detachskb(struct sock *sk,
+@@ -1187,24 +1187,7 @@ void netlink_detachskb(struct sock *sk,
static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
{
- int delta;
-
WARN_ON(skb->sk != NULL);
-- if (netlink_skb_is_mmaped(skb))
-- return skb;
--
- delta = skb->end - skb->tail;
- if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize)
- return skb;