linux-kernel - Re: [PATCH -mm][AIO] AIO completion signal notification fixes and cleanups

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Message-ID: <20070206123946.401bf57f@frecb000686>
Date:	Tue, 6 Feb 2007 12:39:46 +0100
From:	Sébastien Dugué <sebastien.dugue@...l.net>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, linux-aio <linux-aio@...ck.org>,
	Bharata B Rao <bharata@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Jean Pierre Dion <jean-pierre.dion@...l.net>
Subject: Re: [PATCH -mm][AIO] AIO completion signal notification fixes and
 cleanups

On Tue, 6 Feb 2007 14:05:39 +0300 Oleg Nesterov <oleg@...sign.ru> wrote:

> On 02/06, S?bastien Dugu? wrote:
> > 
> > @@ -970,8 +969,14 @@ static long aio_setup_sigevent(struct ai
> >  	rcu_read_lock();
> >  	target = sigevent_find_task(&event);
> >  
> > -	if (unlikely(!target))
> > +	if (unlikely(!target)) {
> > +		/*
> > +		 * Revert notify to SIGEV_NONE so that really_put_req()
> > +		 * knows that no ref has been taken on a task.
> > +		 */
> > +		notify->notify = SIGEV_NONE;
> >  		goto out_unlock;
> > +	}
> 
> Very minor nit, feel free to ignore.
> 
> Isn't it better to move "notify->* = event.*;" down, when we know that
> target != NULL. Imho, a bit easier to follow. This way we don't need to
> reset notify->notify = SIGEV_NONE.
> 
> aio_setup_sigevent() relies on the fact that ->notify = SIGEV_NONE on
> entry anyway.

  Yep, right, it will make things cleaner.

  Thanks,

  Sébastien.
-
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