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

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Date:   Fri, 21 Aug 2020 15:11:42 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Jakub Kicinski <kuba@...nel.org>,
        Luke Hsiao <luke.w.hsiao@...il.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        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 8/21/20 2:41 PM, Jakub Kicinski wrote:
> 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

Well, 8 or 9 of them don't really matter... This is something that should
be cleaned up separately at some point.

> And obviously the brackets around POLLIN are not necessary.

Agree, would be cleaner without!

Luke, with that:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe