Re: [PATCH 6.12.y 11/15] io_uring/msg_ring: ensure io_kiocb freeing is deferred for RCU

[Jens Axboe <axboe@kernel.dk>]

On 9/5/25 5:04 AM, Harshit Mogalapalli wrote:
> diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
> index 5ce332fc6ff5..3b27d9bcf298 100644
> --- a/include/linux/io_uring_types.h
> +++ b/include/linux/io_uring_types.h
> @@ -648,6 +648,8 @@ struct io_kiocb {
>  	struct io_task_work		io_task_work;
>  	/* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
>  	struct hlist_node		hash_node;
> +	/* for private io_kiocb freeing */
> +	struct rcu_head		rcu_head;
>  	/* internal polling, see IORING_FEAT_FAST_POLL */
>  	struct async_poll		*apoll;
>  	/* opcode allocated if it needs to store data for async defer */

This should go into a union with hash_node, rather than bloat the
struct. That's how it was done upstream, not sure why this one is
different?

-- 
Jens Axboe