linux-kernel - Re: Build regression in next-20150331

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Message-ID: <CANMBJr4T5T6tFM+SPs9btc_qBRdMPL0QA4R_d1XXk7VBDqq_MA@mail.gmail.com>
Date:	Thu, 2 Apr 2015 19:59:53 -0700
From:	Tyler Baker <tyler.baker@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	rafael.j.wysocki@...el.com, John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: Build regression in next-20150331

On 2 April 2015 at 01:29, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Apr 01, 2015 at 11:46:10PM +0200, Rafael J. Wysocki wrote:
>
>> > > ---
>> > >  kernel/time/tick-internal.h |    2 ++
>> > >  1 file changed, 2 insertions(+)
>> > >
>> > > Index: linux-pm/kernel/time/tick-internal.h
>> > > ===================================================================
>> > > --- linux-pm.orig/kernel/time/tick-internal.h
>> > > +++ linux-pm/kernel/time/tick-internal.h
>> > > @@ -110,7 +110,9 @@ static inline int tick_broadcast_update_
>> > >  /* Set the periodic handler in non broadcast mode */
>> > >  static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
>> > >  {
>> > > +#ifdef CONFIG_GENERIC_CLOCKEVENTS
>> > >         dev->event_handler = tick_handle_periodic;
>> > > +#endif
>> > >  }
>> > >  #endif /* !BROADCAST */
>
>> Peter, do you think the above is acceptable or do I need to do anything more
>> sophisticated to fix this?  [The alternative would be probably to prepare an
>> empty definition of tick_handle_periodic() for CONFIG_GENERIC_CLOCKEVENTS and
>> move the definition of struct clock_event_device from under that Kconfig
>> option.]
>
>
> Does not something like the below make more sense? The entire broadcast
> thing doesn't make sense if we don't have generic_clockevents.
>
> Should we wrap more in generic_clockevents there?
>
> ---
>  kernel/time/tick-internal.h |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
> index 2a1563a..5569e65 100644
> --- a/kernel/time/tick-internal.h
> +++ b/kernel/time/tick-internal.h
> @@ -81,6 +81,7 @@ static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
>  #endif /* !TICK_ONESHOT */
>
>  /* Broadcasting support */
> +#ifdef CONFIG_GENERIC_CLOCKEVENTS
>  #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
>  extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
>  extern void tick_install_broadcast_device(struct clock_event_device *dev);
> @@ -114,6 +115,7 @@ static inline void tick_set_periodic_handler(struct clock_event_device *dev, int
>         dev->event_handler = tick_handle_periodic;
>  }
>  #endif /* !BROADCAST */
> +#endif /* GENERIC */
>
>  /* Functions related to oneshot broadcasting */
>  #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)

Tested-by: Tyler Baker <tyler.baker@...aro.org>

Looks good to me.

Applied on top of next-20150402[0]:

---
 kernel/time/tick-internal.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 2a1563a..e332bb4 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -81,6 +81,7 @@ static inline int tick_check_oneshot_change(int
allow_nohz) { return 0; }
 #endif /* !TICK_ONESHOT */

 /* Broadcasting support */
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 extern void tick_install_broadcast_device(struct clock_event_device *dev);
@@ -114,7 +115,7 @@ static inline void
tick_set_periodic_handler(struct clock_event_device *dev, int
  dev->event_handler = tick_handle_periodic;
 }
 #endif /* !BROADCAST */
+#endif /* GENERIC */
 /* Functions related to oneshot broadcasting */
 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) &&
defined(CONFIG_TICK_ONESHOT)
 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
---

Tyler

[0] http://kernelci.org/build/tbaker/kernel/v4.0-rc6-8742-g76c8cce3+gcc-linaro-4.9-2015.02/
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