netdev - [PATCH 1/2] net: enable IPv6 iff IPv4

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Date:   Mon,  1 Apr 2019 12:44:58 -0700
From:   Maciej Żenczykowski <zenczykowski@...il.com>
To:     Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: [PATCH 1/2] net: enable IPv6 iff IPv4

From: Maciej Żenczykowski <maze@...gle.com>

IPv6 is 20 years old and IPv4 has run out of IP addresses
and is deprecated.

It is time to make IPv6 a first class citizen.

As such we remove the ability to compile IPv6 as a module,
and IPv4 support now implies IPv6 support.

This has the nice benefit of allowing upcoming code simplification:
all IPv6 module support can be removed, and we'll be able to merge
IPv6 socket state into the base IPv4 socket state...

At some point we should be able to reverse things and make IPv4
the optional protocol and possibly even make an ipv4.ko.

Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
---
 net/Kconfig      | 1 +
 net/ipv6/Kconfig | 7 +------
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/net/Kconfig b/net/Kconfig
index 3e8fdd688329..0f2ca2137f9e 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -68,6 +68,7 @@ config INET
 	bool "TCP/IP networking"
 	select CRYPTO
 	select CRYPTO_AES
+	select IPV6
 	---help---
 	  These are the protocols used on the Internet and on most local
 	  Ethernets. It is highly recommended to say Y here (this will enlarge
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 613282c65a10..9197f496a112 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -2,10 +2,8 @@
 # IPv6 configuration
 #
 
-#   IPv6 as module will cause a CRASH if you try to unload it
 menuconfig IPV6
-	tristate "The IPv6 protocol"
-	default y
+	bool "The IPv6 protocol"
 	---help---
 	  Support for IP version 6 (IPv6).
 
@@ -15,9 +13,6 @@ menuconfig IPV6
 	  Documentation/networking/ipv6.txt and read the HOWTO at
 	  <http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>
 
-	  To compile this protocol support as a module, choose M here: the
-	  module will be called ipv6.
-
 if IPV6
 
 config IPV6_ROUTER_PREF
-- 
2.21.0.392.gf8f6787159e-goog