linux-kernel - Re: [PATCH] arm: kernel: utilize hrtimer based broadcast

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Date:	Mon, 28 Dec 2015 12:54:28 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Huan Wang <alison.wang@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Huan Wang <alison.wang@...escale.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>, tglx@...utronix.de,
	john.stultz@...aro.org
Subject: Re: [PATCH] arm: kernel: utilize hrtimer based broadcast

On Monday 28 December 2015 07:18:58 Huan Wang wrote:
> Hi, Arnd,
> 
> 	Could you help to review the following patch? Thanks.
> 

Hi Alison,

I'm sorry but I understand very little of this particular area of the kernel.

I've added Daniel Lezcano, John Stultz and Thomas Gleixner to Cc, they all
know this much better than I do and one of them should be able to comment after
their Christmas break.

	Arnd

> > On Fri, Jul 17, 2015 at 10:11:52AM +0100, Alison Wang wrote:
> > > Hrtimer based broadcast is used on ARM platform. It can be registered
> > > as the tick broadcast device in the absence of a real external clock
> > > device.
> > >
> > > Signed-off-by: Alison Wang <alison.wang@...escale.com>
> > 
> > This looks sensible to me. FWIW:
> > 
> > Acked-by: Mark Rutland <mark.rutland@....com>
> > 
> > Thanks,
> > Mark.
> > 
> > > ---
> > >  arch/arm/kernel/time.c | 3 +++
> > >  1 file changed, 3 insertions(+)
> > >
> > > diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c index
> > > a66e37e..a9bc73c 100644
> > > --- a/arch/arm/kernel/time.c
> > > +++ b/arch/arm/kernel/time.c
> > > @@ -12,6 +12,7 @@
> > >   *  reading the RTC at bootup, etc...
> > >   */
> > >  #include <linux/clk-provider.h>
> > > +#include <linux/clockchips.h>
> > >  #include <linux/clocksource.h>
> > >  #include <linux/errno.h>
> > >  #include <linux/export.h>
> > > @@ -121,5 +122,7 @@ void __init time_init(void)
> > >  		of_clk_init(NULL);
> > >  #endif
> > >  		clocksource_of_init();
> > > +
> > > +		tick_setup_hrtimer_broadcast();
> > >  	}
> > >  }


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