Hello, Roman. On Thu, Aug 11, 2016 at 11:07:14AM +0200, Roman Penyaev wrote: > Yes, exactly, this is an illegal operation. But it is not more illegal > than calling kill() twice or reinit() when counter is not yet zero. > And those illegals are covered with warnings, which can be observed > for example with this freeze/unfreeze blk-mq bug.
I have no objections about adding warnings for these conditions; however, adding rcu barrier to mask illegal usages is a very different thing. That adds a lot of unnecessary latency to the exit function and makes it unusable from non-sleepable contexts. Thanks. -- tejun
