From 7e5766fa9431602ef0e56ceae900d0cce3a78b96 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@bnsf.davemloft.net>
Date: Mon, 29 Oct 2007 00:36:09 -0700
Subject: [PATCH] [SPARC64]: Fix build failure when CONFIG_BUG is disabled.

When CONFIG_BUG is turned off, the standard trick of:

	switch (x) {
	case X:
	...
	case Y:
	...
	default:
		BUG();
	};

to mark impossible cases does not work because BUG() evalutes
to nothing and thus GCC just sees a fallthrough code path.

Add an explicit KERN_ERR log message and a do_exit() to trap
this case.

Signed-off-by: David S. Miller <davem@davemloft.net>
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