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Subject: Re: [PATCH liburing v2 0/1] test: add epoll test case
To:     Stefano Garzarella <sgarzare@redhat.com>
Cc:     linux-kernel@vger.kernel.org, io-uring@vger.kernel.org
References: <20200131142943.120459-1-sgarzare@redhat.com>
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 <CAGxU2F6qvW28=ULNUi-UHethus2bO6VXYX127HOcH_KPToZC-w@mail.gmail.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <57766a26-866b-3288-dc69-5104de3ac6b6@kernel.dk>
Date:   Thu, 6 Feb 2020 12:46:51 -0700
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On 2/6/20 10:33 AM, Stefano Garzarella wrote:
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 77f22c3da30f..2769451af89a 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -6301,7 +6301,7 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
>         if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head !=
>             ctx->rings->sq_ring_entries)
>                 mask |= EPOLLOUT | EPOLLWRNORM;
> -       if (READ_ONCE(ctx->rings->cq.head) != ctx->cached_cq_tail)
> +       if (!io_cqring_events(ctx, false))
>                 mask |= EPOLLIN | EPOLLRDNORM;
> 
>         return mask;

Are you going to send this as a proper patch? If so, I think you'll want
to remove the '!' negation for that check.

-- 
Jens Axboe