net: netpoll: Fix kabi in netpoll by using KABI_EXTEND

deepin inclusion
category: kabi

When DEEPIN_KABI_RESERVE=y, struct net_device is kabi whitelist,
commit dc67d67a995e ("net: netpoll: Individualize the skb pool")
upstream introduce skb_pool in every struct netpoll which
"modify the netpoll system to assign a skb pool to each target instead of
using a global one."
and be backport to v6.6.117 stable version for it is Stable-dep-of
commit 49c8d2c ("net: netpoll: fix incorrect refcount handling causing incorrect cleanup")

change struct netpoll { ... +struct sk_buff_head skb_pool; }
->change netpoll_info { ... struct netpoll *netpoll; }
->change net_device { struct netpoll_info *npinfo; }
->change some EXPORT_SYMBOL such as free_netdev etc ...
in our KABI whitelist.

The struct sk_buff_head { struct sk_buff	*next;
struct sk_buff	*prev; .. } is larger than KABI reverse in the struct,
so cannot use KABI_USE in this situation.
For netpoll pointer after change is same as before and use internal.
We can use DEEPIN_KABI_EXTEND to fix it.

Fixes: ca946ee ("net: netpoll: Individualize the skb pool")
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: opsiff

include/linux/netpoll.h

@@ -32,10 +32,10 @@ struct netpoll {
 	bool ipv6;
 	u16 local_port, remote_port;
 	u8 remote_mac[ETH_ALEN];
-	struct sk_buff_head skb_pool;
 
 	DEEPIN_KABI_RESERVE(1)
 	DEEPIN_KABI_RESERVE(2)
+	DEEPIN_KABI_EXTEND(struct sk_buff_head skb_pool)
 };
 
 struct netpoll_info {