linux-kernel - Re: [RESEND PATCH] futex: fix key reference counter in case of requeue.

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Date:	Fri, 15 Oct 2010 21:18:19 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Darren Hart <dvhart@...ux.intel.com>
cc:	Louis Rilling <louis.rilling@...labs.com>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	Matthieu Fertré <matthieu.fertre@...labs.com>
Subject: Re: [RESEND PATCH] futex: fix key reference counter in case of
 requeue.

On Fri, 15 Oct 2010, Darren Hart wrote:
> On 10/14/2010 04:30 AM, Louis Rilling wrote:
> > Signed-off-by: Matthieu Fertré<matthieu.fertre@...labs.com>
> > Signed-off-by: Louis Rilling<louis.rilling@...labs.com>
> > ---
> >   kernel/futex.c |    8 ++++++--
> >   1 files changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/futex.c b/kernel/futex.c
> > index 6a3a5fa..bed6717 100644
> > --- a/kernel/futex.c
> > +++ b/kernel/futex.c
> > @@ -1791,6 +1791,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
> >   	struct restart_block *restart;
> >   	struct futex_hash_bucket *hb;
> >   	struct futex_q q;
> > +	union futex_key key;
> 
> We should be able to do this properly without requiring an additional key
> variable. I think tglx has proposed a suitable fix - but it needs testing to
> avoid any subtle regressions.

Well, that still needs a look into wait_requeue_pi() :)

Thanks,

	tglx