11927 Log, or optionally panic, on zero-length kmem allocations
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jason King <jason.brian.king@gmail.com>

@@ -3915,10 +3915,12 @@
                         return (DCMD_USAGE);
                 if (strcmp(argv->a_un.a_str, "fail") == 0)
                         logname = "kmem_failure_log";
                 else if (strcmp(argv->a_un.a_str, "slab") == 0)
                         logname = "kmem_slab_log";
+                else if (strcmp(argv->a_un.a_str, "zerosized") == 0)
+                        logname = "kmem_zerosized_log";
                 else
                         return (DCMD_USAGE);
         }
 
         if (mdb_readvar(&addr, logname) == -1) {