linux-kernel - Re: [PATCH v2 2/2] io_uring: add io-wq workqueue sharing

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Message-ID: <86c5b26b-ae03-01ba-8735-ee37647b3d48@kernel.dk>
Date:   Mon, 27 Jan 2020 17:22:02 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Daurnimator <quae@...rnimator.com>
Subject: Re: [PATCH v2 2/2] io_uring: add io-wq workqueue sharing

On 1/27/20 5:15 PM, Pavel Begunkov wrote:
> @@ -6577,7 +6613,11 @@ static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
>  
>  	if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL |
>  			IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE |
> -			IORING_SETUP_CLAMP))
> +			IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ))
> +		return -EINVAL;
> +
> +	/* wq_fd isn't valid without ATTACH_WQ being set */
> +	if (!(p.flags & IORING_SETUP_ATTACH_WQ) && p.wq_fd)
>  		return -EINVAL;

Since we're now using file descriptors, this no longer works. Any values
(outside of -1) is fair game.

-- 
Jens Axboe