linux-kernel - Re: [RFC][patch 3/5] remove clocksource inline functions

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Date:	Wed, 22 Jul 2009 09:33:13 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	john stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [RFC][patch 3/5] remove clocksource inline functions

On Tue, 21 Jul 2009 15:03:55 -0700
john stultz <johnstul@...ibm.com> wrote:

> On Tue, 2009-07-21 at 21:17 +0200, Martin Schwidefsky wrote:
> > plain text document attachment (clocksource-inline.diff)
> > From: Martin Schwidefsky <schwidefsky@...ibm.com>
> > 
> > Remove clocksource_read, clocksource_enable and clocksource_disable
> > inline functions. No functional change.
> > 
> > Cc: Ingo Molnar <mingo@...e.hu>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: john stultz <johnstul@...ibm.com>
> > Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
> > ---
> >  kernel/time/clocksource.c |   18 ++++++++++++------
> >  kernel/time/timekeeping.c |   13 ++++++-------
> >  2 files changed, 18 insertions(+), 13 deletions(-)
> 
> 
> There's a patch Magnus has that (should be) queued for 2.6.31 that makes
> unbreaks the mult_orig manipulations enable/disable does. I suspect this
> will cause this inline function removing to not be that much of a
> benefit.

After moving the enable/disable code over to clocksource.c there is no
reason for the inline function anymore, no?

> > Index: linux-2.6/kernel/time/clocksource.c
> > ===================================================================
> > --- linux-2.6.orig/kernel/time/clocksource.c
> > +++ linux-2.6/kernel/time/clocksource.c
> > @@ -517,7 +517,7 @@ void clocksource_forward_now(void)
> >  	cycle_t cycle_now, cycle_delta;
> >  	s64 nsec;
> > 
> > -	cycle_now = clocksource_read(clock);
> > +	cycle_now = clock->read(clock);
> >  	cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
> >  	clock->cycle_last = cycle_now;
> > 
> > @@ -567,16 +567,19 @@ void change_clocksource(void)
> > 
> >  	clocksource_forward_now();
> > 
> > -	if (clocksource_enable(new))
> > +	if (new->enable && !new->enable(new))
> >  		return;
> > 
> > +	/* save mult_orig after successful enable */
> > +	new->mult_orig = new->mult;
> > +
> >  	new->raw_time = clock->raw_time;
> >  	old = clock;
> >  	clock = new;
> > -	clocksource_disable(old);
> > +	if (old->disable)
> > +		old->disable(old);
> 
> 	mult_orig needs to be saved to mult at this point.

Yes, it would make sense to do that. The old code doesn't so I did not
want to add it in a cleanup patch. That should be a patch on its own.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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