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Unlike other configurations in net/ppp, PPPOLAC and PPPOPNS are defined as boolean configuration options. In allmodconfig builds (or, specifically, if PPP and some of the other PPP protocols were built as modules), this resulted in build errors such as the following, since pppox was built both as module and into the kernel. ERROR: "pppox_ioctl" [net/l2tp/l2tp_ppp.ko] undefined! ERROR: "unregister_pppox_proto" [net/l2tp/l2tp_ppp.ko] undefined! ERROR: "register_pppox_proto" [net/l2tp/l2tp_ppp.ko] undefined! ERROR: "pppox_unbind_sock" [net/l2tp/l2tp_ppp.ko] undefined! Fix the problem by defining PPPOLAC and PPPOPNS tristate. Signed-off-by: Guenter Roeck <groeck@chromium.org>