taint: add explicit flag to show whether lock dep is still OK.

Fix up all callers as they were before, with make one change: an
unsigned module taints the kernel, but doesn't turn off lockdep.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index bd42b76..f7f9f9c 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -72,7 +72,7 @@
 
 	bust_spinlocks(0);
 	die.lock_owner = -1;
-	add_taint(TAINT_DIE);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irq(&die.lock);
 
 	if (!regs)