[3.0] 2587b1b Mark ban list as volatile

[Tollef Fog Heen]

commit 2587b1b973b1c4e019ee74da7a93fe31af5a6186
Author: Tollef Fog Heen <tfheen at varnish-software.com>
Date:   Tue Sep 18 11:21:09 2012 +0200

    Mark ban list as volatile
    
    Fixes #1194

diff --git a/bin/varnishd/cache_ban.c b/bin/varnishd/cache_ban.c
index 5c1da57..138a1f6 100644
--- a/bin/varnishd/cache_ban.c
+++ b/bin/varnishd/cache_ban.c
@@ -81,7 +81,8 @@ struct ban_test {
 	const void		*arg2_spec;
 };
 
-static VTAILQ_HEAD(banhead_s,ban) ban_head = VTAILQ_HEAD_INITIALIZER(ban_head);
+/* XXX phk thinks he knows why this is a good idea */
+static volatile VTAILQ_HEAD(banhead_s,ban) ban_head = VTAILQ_HEAD_INITIALIZER(ban_head);
 static struct lock ban_mtx;
 static struct ban *ban_magic;
 static pthread_t ban_thread;