Architecture specific implementations for tickless kernel and deferrable timers

Thomas Gleixner tglx at
Fri Apr 29 13:05:45 EDT 2011

On Fri, 29 Apr 2011, Vikram Narayanan wrote:

> On Fri, Apr 29, 2011 at 8:04 PM, Russell King - ARM Linux
> <linux at> wrote:
> > On Fri, Apr 29, 2011 at 07:56:56PM +0530, Vikram Narayanan wrote:
> >> Can you also give some idea on how the system's RTC is hooked up with
> >> the generic timekeeping code.
> >> Is it hooked up in someway so that the walltime is calculated wrt the
> >> initial value of the RTC?
> >
> > I'd like to pass you over to the RTC folk, but I don't think they're
> > very active anymore.
> >
> > Suffice it to say that the RTC subsystem will set the system date/time
> > on initialization from the RTC device if one is provided.  All I can
> > suggest is to look at drivers/rtc and include/linux/rtc.h for the
> > details.  The MAINTAINERS file should list who is responsible for RTC
> > stuff as well as a mailing list for it.
> >
> Yes. Sure. I already have a driver in place for RTC, under /dev/rtc. I
> will try to post my doubts in the RTC mailing lists.
> Just noticed a folder clocksource under drivers.
> Quite curious about what it is for?
> Can you give some hints about it?

That's for clock sources which are shared accross platforms.



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