linux-kernel - Re: [stable] Why does timerfd() only support CLOCK_REALTIME and CLOCK

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Message-ID: <20090208221027.GA14523@kroah.com>
Date:	Sun, 8 Feb 2009 14:10:27 -0800
From:	Greg KH <greg@...ah.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Michael Kerrisk <mtk.manpages@...il.com>,
	"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [stable] Why does timerfd() only support CLOCK_REALTIME and
	CLOCK_MONOTONIC?

On Sun, Feb 08, 2009 at 02:06:34PM -0800, Davide Libenzi wrote:
> On Mon, 9 Feb 2009, Michael Kerrisk wrote:
> 
> > On Mon, Feb 9, 2009 at 10:50 AM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > > On Mon, 9 Feb 2009, Michael Kerrisk wrote:
> > >
> > >> > @@ -186,12 +187,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clo
> > >> >        BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
> > >> >        BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK);
> > >> >
> > >> > -       if (flags & ~(TFD_CLOEXEC | TFD_NONBLOCK))
> > >> > +       if ((flags & ~TFD_FLAGS_SET) ||
> > >> > +           invalid_clockid(clockid))
> > >> >                return -EINVAL;
> > >>
> > >> Oh!  Does this mean that in 2.6.2[789] it wasn't possible to use
> > >> TFD_TIMER_ABSTIME?
> > >
> > > No, sorry, my fault. Patch is wrong. In "create" ATM we accept only
> > > FCNTL-like flags. In "settime" we get TFD_TIMER_ABSTIME (that needs a
> > > check too for EINVAL).
> > 
> > That last piece should be a separate patch, that also gets pushed back
> > into -stable.  Do you agree?
> 
> Hmm, it's a check for extra bits that do not cause any harm. Dunno if it 
> fits -stable requirements. You should ask Greg.

If it fixes a bug, it would go into -stable.  Does this?

thanks,

greg k-h
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