Re: [PATCH 5.15] io_uring: apply max_workers limit to all future users

[Jens Axboe <axboe@kernel.dk>]

On 10/19/21 4:43 PM, Pavel Begunkov wrote:
> Currently, IORING_REGISTER_IOWQ_MAX_WORKERS applies only to the task
> that issued it, it's unexpected for users. If one task creates a ring,
> limits workers and then passes it to another task the limit won't be
> applied to the other task.
> 
> Another pitfall is that a task should either create a ring or submit at
> least one request for IORING_REGISTER_IOWQ_MAX_WORKERS to work at all,
> furher complicating the picture.
> 
> Change the API, save the limits and apply to all future users. Note, it
> should be done first before giving away the ring or submitting new
> requests otherwise the result is not guaranteed.

Thanks, let's do this for 5.15. I've added:

Fixes: 2e480058ddc2 ("io-wq: provide a way to limit max number of workers")

-- 
Jens Axboe