If gre is built as a module the 'ip tunnel add' command would fail because
the ip_gre module was not being autoloaded.  Adding an alias for
the gre0 device name cause dev_load() to autoload it when needed.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>


--- a/net/ipv4/ip_gre.c	2010-11-29 11:35:36.388589982 -0800
+++ b/net/ipv4/ip_gre.c	2010-11-29 11:35:46.675624021 -0800
@@ -1764,3 +1764,4 @@ module_exit(ipgre_fini);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_RTNL_LINK("gre");
 MODULE_ALIAS_RTNL_LINK("gretap");
+MODULE_ALIAS("gre0");


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