linux-kernel - Re: [patch V2 12/64] timekeeper: Move tk

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Message-ID: <alpine.DEB.2.10.1407232358460.23352@nanos>
Date:	Wed, 23 Jul 2014 23:59:31 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Stultz <john.stultz@...aro.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch V2 12/64] timekeeper: Move tk_xtime to core code

On Wed, 23 Jul 2014, John Stultz wrote:
> On Wed, Jul 16, 2014 at 2:04 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > Index: tip/kernel/time/timekeeping.c
> > ===================================================================
> > --- tip.orig/kernel/time/timekeeping.c
> > +++ tip/kernel/time/timekeeping.c
> > @@ -51,6 +51,15 @@ static inline void tk_normalize_xtime(st
> >         }
> >  }
> >
> > +static inline struct timespec64 tk_xtime(struct timekeeper *tk)
> > +{
> > +       struct timespec64 ts;
> > +
> > +       ts.tv_sec = tk->xtime_sec;
> > +       ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
> > +       return ts;
> > +}
> > +
> >  static void tk_set_xtime(struct timekeeper *tk, const struct timespec64 *ts)
> >  {
> >         tk->xtime_sec = ts->tv_sec;
> > @@ -199,6 +208,40 @@ static inline s64 timekeeping_get_ns_raw
> >         return nsec + arch_gettimeoffset();
> >  }
> >
> > +#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
> > +
> > +static inline void update_vsyscall(struct timekeeper *tk)
> > +{
> > +       struct timespec xt;
> > +
> > +       xt = tk_xtime(tk);
> > +       update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
> > +}
> 
> So one gotcha here, and I realized I missed this in my timekeeping
> timespec64 conversion patch, is that here we're calling tk_xtime()
> which returns a timespec64, and we stuff it into a timespec.
> 
> Now, the reason we didn't see the compiler gripe on this, was that the
> only VSYSCALL_OLD implementations left are ia64 and ppc64.
> 
> I'll add a fixup patch to the queue to address this.

Nice catch!

Thanks,

	tglx
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