linux-kernel - Re: net: Generalise wq_has

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Message-Id: <20151125.113729.987827630302526646.davem@davemloft.net>
Date:	Wed, 25 Nov 2015 11:37:29 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	peterz@...radead.org
Cc:	herbert@...dor.apana.org.au, tatsu@...jp.nec.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jolsa@...hat.com, eric.dumazet@...il.com
Subject: Re: net: Generalise wq_has_sleeper helper

From: Peter Zijlstra <peterz@...radead.org>
Date: Wed, 25 Nov 2015 10:15:33 +0100

> On Tue, Nov 24, 2015 at 01:54:23PM +0800, Herbert Xu wrote:
>> + * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
>> + * in its cache, and so does the tp->rcv_nxt update on CPU2 side.  The CPU1
>> + * could then endup calling schedule and sleep forever if there are no more
>> + * data on the socket.
>> + *
> 
> Would be easier to refer to the comment that now adorns
> waitqueue_active().

Yeah, that might be a good idea.  Herbert can you adjust this?

>> + */
>> +static inline bool wq_has_sleeper(wait_queue_head_t *wq)
>> +{
>> +	/* We need to be sure we are in sync with the
> 
> broken comment style.

This is how we do it in the networking, so that's why it's formatted
this way, but yes he will need to fix it up.
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