linux-kernel - Re: [PATCH] ntp: make is_error

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Date:	Tue, 13 May 2014 00:10:57 +0400
From:	Alexander Gordeev <lasaine@....cs.msu.su>
To:	John Stultz <john.stultz@...aro.org>
Cc:	George Spelvin <linux@...izon.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ntp: make is_error_status() use its argument

No objections from me, of course. Good catch.

В Mon, 12 May 2014 10:54:29 -0700
John Stultz <john.stultz@...aro.org> пишет:

> On 05/12/2014 06:35 AM, George Spelvin wrote:
> > It's an inline function always called with the global time_status
> > as an argument, so there's zero functional difference, but the
> > non-CONFIG_SMP version uses the passed-in argument, while the
> > CONFIG_SMP one ignores its argument and uses the global.
> 
> CONFIG_NTP_PPS not CONFIG_SMP, right?
> 
> Good catch though, looks like the check code was re-factored out, but
> someone forgot to use the local variable.
> 
> Adding Alexander since he submitted the pps logic.
> 
> If there's no objections, I'll queue this (with a more verbose commit
> message) for 3.16
> 
> thanks
> -john
> 
> 
> >     
> > Make it use the argument always; shorter variable names are good.
> >
> > Signed-off-by: George Spelvin <linux@...izon.com>
> > ---
> > While poking about in the code, I came across this rather odd bit.
> > It looked worth fixing, on general principles.
> >
> > diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
> > index 419a52cecd..1a2aad3fff 100644
> > --- a/kernel/time/ntp.c
> > +++ b/kernel/time/ntp.c
> > @@ -165,21 +165,21 @@ static inline void pps_set_freq(s64 freq)
> >  
> >  static inline int is_error_status(int status)
> >  {
> > -	return (time_status & (STA_UNSYNC|STA_CLOCKERR))
> > +	return (status & (STA_UNSYNC|STA_CLOCKERR))
> >  		/* PPS signal lost when either PPS time or
> >  		 * PPS frequency synchronization requested
> >  		 */
> > -		|| ((time_status & (STA_PPSFREQ|STA_PPSTIME))
> > -			&& !(time_status & STA_PPSSIGNAL))
> > +		|| ((status & (STA_PPSFREQ|STA_PPSTIME))
> > +			&& !(status & STA_PPSSIGNAL))
> >  		/* PPS jitter exceeded when
> >  		 * PPS time synchronization requested */
> > -		|| ((time_status & (STA_PPSTIME|STA_PPSJITTER))
> > +		|| ((status & (STA_PPSTIME|STA_PPSJITTER))
> >  			== (STA_PPSTIME|STA_PPSJITTER))
> >  		/* PPS wander exceeded or calibration error when
> >  		 * PPS frequency synchronization requested
> >  		 */
> > -		|| ((time_status & STA_PPSFREQ)
> > -			&& (time_status &
> > (STA_PPSWANDER|STA_PPSERROR)));
> > +		|| ((status & STA_PPSFREQ)
> > +			&& (status &
> > (STA_PPSWANDER|STA_PPSERROR))); }
> >  
> >  static inline void pps_fill_timex(struct timex *txc)
> 



-- 
  Alexander
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