enable tun/tap/iptables

hc

2024-05-10 ee930fffee469d076998274a2ca55e13dc1efb67

 kernel/include/linux/tracepoint.h
..
..
@@ -234,12 +234,11 @@
234
234
  * not add unwanted padding between the beginning of the section and the
235
235
  * structure. Force alignment to the same alignment as the section start.
236
236
  *
237
- * When lockdep is enabled, we make sure to always do the RCU portions of
238
- * the tracepoint code, regardless of whether tracing is on. However,
239
- * don't check if the condition is false, due to interaction with idle
240
- * instrumentation. This lets us find RCU issues triggered with tracepoints
241
- * even when this tracepoint is off. This code has no purpose other than
242
- * poking RCU a bit.
237
+ * When lockdep is enabled, we make sure to always test if RCU is
238
+ * "watching" regardless if the tracepoint is enabled or not. Tracepoints
239
+ * require RCU to be active, and it should always warn at the tracepoint
240
+ * site if it is not watching, as it will need to be active when the
241
+ * tracepoint is enabled.
243
242
  */
244
243
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
245
244
 	extern int __traceiter_##name(data_proto);			\
..
..
@@ -253,9 +252,7 @@
253
252
 				TP_ARGS(data_args),			\
254
253
 				TP_CONDITION(cond), 0);			\
255
254
 		if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {		\
256
-			rcu_read_lock_sched_notrace();			\
257
-			rcu_dereference_sched(__tracepoint_##name.funcs);\
258
-			rcu_read_unlock_sched_notrace();		\
255
+			WARN_ON_ONCE(!rcu_is_watching());		\
259
256
 		}							\
260
257
 	}								\
261
258
 	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\