linux-kernel - Re: [patch 20/28] posix-timers: Make posix-cpu-timers functions static

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Date:	Tue, 1 Feb 2011 22:33:58 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Stultz <john.stultz@...aro.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Richard Cochran <richard.cochran@...cron.at>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch 20/28] posix-timers: Make posix-cpu-timers functions
 static

On Tue, 1 Feb 2011, John Stultz wrote:

> On Tue, 2011-02-01 at 13:52 +0000, Thomas Gleixner wrote:
> > plain text document attachment
> > (posix-timer-make-posix-cpu-timer-functions-static.patch)
> > All functions are accessed via clock_posix_cpu now. So make them static.
> > 
> > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > Cc: John Stultz <john.stultz@...aro.org>
> > Cc: Richard Cochran <richard.cochran@...cron.at>
> 
> This patch seems to have more then just making functions static in it.
> 
> > @@ -1481,68 +1483,67 @@ static int do_cpu_nanosleep(const clocki
> >  	return error;
> >  }
> > 
> > -int posix_cpu_nsleep(const clockid_t which_clock, int flags,
> > -		     struct timespec *rqtp, struct timespec __user *rmtp)
> > +static long posix_cpu_nsleep_restart(struct restart_block *restart_block)
> >  {
> > -	struct restart_block *restart_block =
> > -		&current_thread_info()->restart_block;
> > +	clockid_t which_clock = restart_block->nanosleep.index;
> > +	struct timespec t;
> >  	struct itimerspec it;
> >  	int error;
> > 
> > -	/*
> > -	 * Diagnose required errors first.
> > -	 */
> > -	if (CPUCLOCK_PERTHREAD(which_clock) &&
> > -	    (CPUCLOCK_PID(which_clock) == 0 ||
> > -	     CPUCLOCK_PID(which_clock) == current->pid))
> > -		return -EINVAL;
> > +	t = ns_to_timespec(restart_block->nanosleep.expires);
> > 
> > -	error = do_cpu_nanosleep(which_clock, flags, rqtp, &it);
> > +	error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it);
> > 
> >  	if (error == -ERESTART_RESTARTBLOCK) {
> > -
> > -		if (flags & TIMER_ABSTIME)
> > -			return -ERESTARTNOHAND;
> > +		struct timespec __user *rmtp = restart_block->nanosleep.rmtp;
> >  		/*
> >  		 * Report back to the user the time still remaining.
> >  		 */
> >  		if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
> >  			return -EFAULT;
> > 
> > -		restart_block->fn = posix_cpu_nsleep_restart;
> > -		restart_block->nanosleep.index = which_clock;
> > -		restart_block->nanosleep.rmtp = rmtp;
> > -		restart_block->nanosleep.expires = timespec_to_ns(rqtp);
> > +		restart_block->nanosleep.expires = timespec_to_ns(&t);
> >  	}
> >  	return error;
> > +
> >  }
> > 
> > -long posix_cpu_nsleep_restart(struct restart_block *restart_block)
> > +static int posix_cpu_nsleep(const clockid_t which_clock, int flags,
> > +			    struct timespec *rqtp, struct timespec __user *rmtp)
> >  {
> > -	clockid_t which_clock = restart_block->nanosleep.index;
> > -	struct timespec t;
> > +	struct restart_block *restart_block =
> > +		&current_thread_info()->restart_block;
> >  	struct itimerspec it;
> >  	int error;
> > 
> > -	t = ns_to_timespec(restart_block->nanosleep.expires);
> > +	/*
> > +	 * Diagnose required errors first.
> > +	 */
> > +	if (CPUCLOCK_PERTHREAD(which_clock) &&
> > +	    (CPUCLOCK_PID(which_clock) == 0 ||
> > +	     CPUCLOCK_PID(which_clock) == current->pid))
> > +		return -EINVAL;
> > 
> > -	error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it);
> > +	error = do_cpu_nanosleep(which_clock, flags, rqtp, &it);
> > 
> >  	if (error == -ERESTART_RESTARTBLOCK) {
> > -		struct timespec __user *rmtp = restart_block->nanosleep.rmtp;
> > +
> > +		if (flags & TIMER_ABSTIME)
> > +			return -ERESTARTNOHAND;
> >  		/*
> >  		 * Report back to the user the time still remaining.
> >  		 */
> >  		if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
> >  			return -EFAULT;
> > 
> > -		restart_block->nanosleep.expires = timespec_to_ns(&t);
> > +		restart_block->fn = posix_cpu_nsleep_restart;
> > +		restart_block->nanosleep.index = which_clock;
> > +		restart_block->nanosleep.rmtp = rmtp;
> > +		restart_block->nanosleep.expires = timespec_to_ns(rqtp);
> >  	}
> >  	return error;
> > -
> >  }
> 
> Maybe split that out?

I just moved the restart function above nanosleep to avoid the forward
declaration, but patch deciced to make it more complex. I'll stick
with the forward declaration.

Thanks,

	tglx
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