I have just noticed that the commit in $subject broke the behavior I introduced in bf3aeb3dbbd7f41369ebcceb887cc081ffff7b75 In this commit, I have explained why and when it does make sense to enter the ring if there are no sqes to submit. I guess one could argue that in that case one could call the system call directly, but it is nice that the application didn't have to worry about that, had to take no conditionals, and could just rely on io_uring_submit as an entry point. Since the author is the first to say in the patch that the patch may not be needed, my opinion is that not only it is not needed but in fact broke applications that relied on previous behavior on the poll ring. Can we please revert?
