linux-kernel - [PATCH net-next v7 4/5] ip_tunnel: Preserve pointer const in ip_tunnel_info

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Date:   Mon, 13 Mar 2023 09:51:06 +0200
From:   Gavin Li <gavinl@...dia.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <roopa@...dia.com>,
        <eng.alaamohamedsoliman.am@...il.com>, <bigeasy@...utronix.de>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <gavi@...dia.com>, <roid@...dia.com>, <maord@...dia.com>,
        <saeedm@...dia.com>
Subject: [PATCH net-next v7 4/5] ip_tunnel: Preserve pointer const in ip_tunnel_info_opts

Change ip_tunnel_info_opts( ) from static function to macro to cast return
value and preserve the const-ness of the pointer.

Signed-off-by: Gavin Li <gavinl@...dia.com>
---
 include/net/ip_tunnels.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index fca357679816..255b32a90850 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -67,6 +67,12 @@ struct ip_tunnel_key {
 	GENMASK((sizeof_field(struct ip_tunnel_info,		\
 			      options_len) * BITS_PER_BYTE) - 1, 0)
 
+#define ip_tunnel_info_opts(info)				\
+	_Generic(info,						\
+		 const struct ip_tunnel_info * : ((const void *)((info) + 1)),\
+		 struct ip_tunnel_info * : ((void *)((info) + 1))\
+	)
+
 struct ip_tunnel_info {
 	struct ip_tunnel_key	key;
 #ifdef CONFIG_DST_CACHE
@@ -485,11 +491,6 @@ static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
 	}
 }
 
-static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
-{
-	return info + 1;
-}
-
 static inline void ip_tunnel_info_opts_get(void *to,
 					   const struct ip_tunnel_info *info)
 {
-- 
2.31.1