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SubjectRe: [RFC][patch 3/5] remove clocksource inline functions
On Tue, 21 Jul 2009 15:03:55 -0700
john stultz <johnstul@us.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@de.ibm.com>
> >
> > Remove clocksource_read, clocksource_enable and clocksource_disable
> > inline functions. No functional change.
> >
> > Cc: Ingo Molnar <mingo@elte.hu>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: john stultz <johnstul@us.ibm.com>
> > Signed-off-by: Martin Schwidefsky <schwidefsky@de.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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