openwrt-archive/target/linux/generic/patches-4.1/653-disable_netlink_trim.patch

--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1776,27 +1776,7 @@ 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;
-
-	if (skb_shared(skb)) {
-		struct sk_buff *nskb = skb_clone(skb, allocation);
-		if (!nskb)
-			return skb;
-		consume_skb(skb);
-		skb = nskb;
-	}
-
-	if (!pskb_expand_head(skb, 0, -delta, allocation))
-		skb->truesize -= delta;
-
 	return skb;
 }