netdev - [PATCH v2 net-next 1/4] net: introduce EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD

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Message-ID: <20250212132418.1524422-2-edumazet@google.com>
Date: Wed, 12 Feb 2025 13:24:15 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>, 
	Willem de Bruijn <willemb@...gle.com>, Sabrina Dubroca <sd@...asysnail.net>, 
	Neal Cardwell <ncardwell@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Mateusz Polchlopek <mateusz.polchlopek@...el.com>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 1/4] net: introduce EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL()

We have many EXPORT_SYMBOL(x) in networking tree because IPv6
can be built as a module.

CONFIG_IPV6=y is becoming the norm.

Define a EXPORT_IPV6_MOD(x) which only exports x
for modular IPv6.

Same principle applies to EXPORT_IPV6_MOD_GPL()

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ip.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/net/ip.h b/include/net/ip.h
index 9f5e33e371fcdd8ea88c54584b8d4b6c50e7d0c9..1e40c5ac53a74e1c20157709e49edf2271e44fe3 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -666,6 +666,14 @@ static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast,
 		memcpy(buf, &naddr, sizeof(naddr));
 }
 
+#if IS_MODULE(CONFIG_IPV6)
+#define EXPORT_IPV6_MOD(X) EXPORT_SYMBOL(X)
+#define EXPORT_IPV6_MOD_GPL(X) EXPORT_SYMBOL_GPL(X)
+#else
+#define EXPORT_IPV6_MOD(X)
+#define EXPORT_IPV6_MOD_GPL(X)
+#endif
+
 #if IS_ENABLED(CONFIG_IPV6)
 #include <linux/ipv6.h>
 #endif
-- 
2.48.1.502.g6dc24dfdaf-goog