kernel: describe bridge patch "remove IPv6 depependency of bridge in 2.6.38+"

[openwrt.git] / target / linux / generic / patches-4.0 / 643-bridge_remove_ipv6_dependency.patch

diff --git a/target/linux/generic/patches-4.0/643-bridge_remove_ipv6_dependency.patch b/target/linux/generic/patches-4.0/643-bridge_remove_ipv6_dependency.patch
index 50e4fe4..6842d97 100644 (file)
--- a/target/linux/generic/patches-4.0/643-bridge_remove_ipv6_dependency.patch
+++ b/target/linux/generic/patches-4.0/643-bridge_remove_ipv6_dependency.patch
@@ -1,3 +1,16 @@
+From: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
+Subject: [PATCH] bridge: remove IPv6 depependency of bridge in 2.6.38+
+
+Since 2.6.38 the bridge module has a dependency to IPv6 if IPv6 is
+enabled. Since the IPv6 module isn't exactly lightweight and bridge also
+only needs a single function from IPv6, it's rather easy to create a
+common "lib" module with a RCU pointer to the actual implementation, if
+the IPv6 module is loaded (although slightly hackish).
+
+The codepath seems to be only taken when using IPv6, so there should be
+no negative side effects when IPv6 isn't loaded. I did not measure how
+big the performance impact is.
+---
 --- a/include/net/addrconf.h
 +++ b/include/net/addrconf.h
 @@ -91,6 +91,12 @@ int ipv6_rcv_saddr_equal(const struct so