[PATCH net-next 1/4] net: introduce EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL()

[Eric Dumazet <edumazet@google.com>]

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@google.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