Re: [PATCH/RFC] Re: recvmmsg() timeout behavior strangeness [RESEND]

[David Miller]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Date: Wed, 21 May 2014 18:05:35 -0300

> But after thinking a bit more, looks like we need to do that, please
> take a look at the attached patch to see if it addresses the problem.
> 
> Mostly it adds a new timeop to the per protocol recvmsg()
> implementations, that, if not NULL, should be used instead of
> SO_RCVTIMEO.
> 
> since the underlying recvmsg implementations already check that timeout,
> return what is remaining, that will then be used in subsequent recvmsg
> calls, at the end we just convert it back to timespec format.
> 
> In most cases it is just passed to skb_recv_datagram, that will check
> the pointer, use it and update if not NULL.
> 
> Should have no problems, but I only did a boot with a system with this
> patch applied, no problems noticed on a normal desktop session, ssh,
> etc.

This looks fine to me, but I have a small request:

+	return noblock ? 0 : timeop ? *timeop : sk->sk_rcvtimeo;

I keep forgetting which way these expressions associate, so if you could
parenthesize the innermost ?: I'd appreciate it. :)

Thanks!
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