netdev - Re: [PATCH net-next 2/2] io_uring: ignore POLLIN for recvmsg on MSG

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Date:   Fri, 21 Aug 2020 13:41:44 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Luke Hsiao <luke.w.hsiao@...il.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>,
        Luke Hsiao <lukehsiao@...gle.com>,
        Arjun Roy <arjunroy@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 2/2] io_uring: ignore POLLIN for recvmsg on
 MSG_ERRQUEUE

On Thu, 20 Aug 2020 16:49:54 -0700 Luke Hsiao wrote:
> +	/* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */
> +	if (req->opcode == IORING_OP_RECVMSG && (sqe->msg_flags & MSG_ERRQUEUE))
> +		mask &= ~(POLLIN);

FWIW this adds another W=1 C=1 warnings to this code:

fs/io_uring.c:4940:22: warning: invalid assignment: &=
fs/io_uring.c:4940:22:    left side has type restricted __poll_t
fs/io_uring.c:4940:22:    right side has type int


And obviously the brackets around POLLIN are not necessary.