net: Build IPv6 into kernel by default

This patch makes the default to build IPv6 into the kernel. IPv6 now has significant traction and any remaining vestiges of IPv6 not being provided parity with IPv4 should be swept away. IPv6 is now core to the Internet and kernel. Points on IPv6 adoption: - Per Google statistics, IPv6 usage has reached 7% on the Internet and continues to exhibit an exponential growth rate https://www.google.com/intl/en/ipv6/statistics.html - Just a few days ago ARIN officially depleted its IPv4 pool - IPv6 only data centers are being successfully built (e.g. at Facebook) This patch changes the IPv6 Kconfig for IPV6. Default for CONFIG_IPV6 is set to "y" and the text has been updated to reflect the maturity of IPv6. Impact: Under some circumstances building modules in to kernel might have a performance advantage. In my testing, I did notice a very slight improvement. This will obviously increase the size of the kernel image. In my configuration I see: IPv6 as module: text data bss dec hex filename 9703666 1899288 933888 12536842 bf4c0a vmlinux IPv6 built into kernel text data bss dec hex filename 9436490 1879600 913408 12229498 ba9b7a vmlinux Which increases text size by ~270K (2.8% increase in size for me). If image size is an issue, presumably for a device which does not do IP networking (IMO we should be discouraging IPv4-only devices), IPV6 can be disabled or still built as a module. Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>

net: Build IPv6 into kernel by default
This patch makes the default to build IPv6 into the kernel. IPv6 now has significant traction and any remaining vestiges of IPv6 not being provided parity with IPv4 should be swept away. IPv6 is now core to the Internet and kernel. Points on IPv6 adoption: - Per Google statistics, IPv6 usage has reached 7% on the Internet and continues to exhibit an exponential growth rate https://www.google.com/intl/en/ipv6/statistics.html - Just a few days ago ARIN officially depleted its IPv4 pool - IPv6 only data centers are being successfully built (e.g. at Facebook) This patch changes the IPv6 Kconfig for IPV6. Default for CONFIG_IPV6 is set to "y" and the text has been updated to reflect the maturity of IPv6. Impact: Under some circumstances building modules in to kernel might have a performance advantage. In my testing, I did notice a very slight improvement. This will obviously increase the size of the kernel image. In my configuration I see: IPv6 as module: text data bss dec hex filename 9703666 1899288 933888 12536842 bf4c0a vmlinux IPv6 built into kernel text data bss dec hex filename 9436490 1879600 913408 12229498 ba9b7a vmlinux Which increases text size by ~270K (2.8% increase in size for me). If image size is an issue, presumably for a device which does not do IP networking (IMO we should be discouraging IPv4-only devices), IPV6 can be disabled or still built as a module. Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
de551f2e · Tom Herbert · David S. Miller · 14fe22e3 · de551f2e
Commit de551f2e authored Jul 13, 2015 by Tom Herbert Committed by David S. Miller Jul 13, 2015
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net/ipv6/Kconfig net/ipv6/Kconfig +5 -6

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--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -5,16 +5,15 @@
 #   IPv6 as module will cause a CRASH if you try to unload it
 menuconfig IPV6
 	tristate "The IPv6 protocol"
-	default m
+	default y
 	---help---
-	  This is complemental support for the IP version 6.
-	  You will still be able to do traditional IPv4 networking as well.
+	  Support for IP version 6 (IPv6).

 	  For general information about IPv6, see
 	  <https://en.wikipedia.org/wiki/IPv6>.
-	  For Linux IPv6 development information, see <http://www.linux-ipv6.org>.
-	  For specific information about IPv6 under Linux, read the HOWTO at
-	  <http://www.bieringer.de/linux/IPv6/>.
+	  For specific information about IPv6 under Linux, see
+	  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.