Re: [PATCH net v2] net: fix race between napi kthread mode and busy poll

On Fri, 26 Feb 2021 16:30:47 -0800 Wei Wang wrote:

 		thread = READ_ONCE(napi->thread);
 		if (thread) {
+			set_bit(NAPI_STATE_SCHED_THREADED, &napi->state);
 			wake_up_process(thread);

What about the version which checks RUNNING? As long as
wake_up_process() implies a barrier I _think_ it should 
work as well. Am I missing some case, or did you decide
to go with the simpler/safer approach?