Have the unwinder allocate memory with M_NOWAIT. The unwinder is

used by DDB and we cannot know in advance whether it's save to
sleep. It often enough isn't. We may want to pre-allocate space
to cover the most common cases without having to use malloc at
all, but that requires some analysis. We leave that for later.

Approved by: re@ (blanket)

sys/ia64/ia64/unwind.c

@@ -61,7 +61,7 @@ static void *
 unw_alloc(size_t sz)
 {
 
-	return (malloc(sz, M_UNWIND, M_WAITOK));
+	return (malloc(sz, M_UNWIND, M_NOWAIT));
 }
 
 static void