Messages in this thread | | | Date | Thu, 10 Jan 2013 09:44:44 +0000 | From | Mark Rutland <> | Subject | Re: [PATCHv2 0/4] clockevents: decouple broadcast mechanism from drivers |
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On Wed, Jan 09, 2013 at 08:46:18PM +0000, Stephen Boyd wrote: > On 01/09/13 06:46, Mark Rutland wrote: > > This is an updated version of the series I posted back in December: > > http://lists.infradead.org/pipermail/linux-arm-kernel/2012-December/137929.html > > > > Changes since v1: > > * Drop removal of guards in smp.c > > * Removed useless evt->evt_handler check in tick_receive_broadcast > > * Fix up tick_receive_broadcast when !GENERIC_CLOCKEVENTS_BROADCAST > > * Fix checkpatch issues (multi-line strings) > > > > Thanks go to Stephen Boyd and Santosh Shilimkar for their commments. > > > > In some SMP systems, cpu-local timers may stop delivering interrupts > > when in low power states, or not all CPUs may have local timers. To > > support these systems we have a mechanism for broadcasting timer ticks > > to other CPUs. This mechanism relies on the struct > > clock_event_device::broadcast function pointer, which is a > > driver-specific mechanism for broadcasting ticks to other CPUs. > > > > As the broadcast mechanism is architecture-specific, placing the > > broadcast function on struct clock_event_device ties each driver to a > > single architecture. Additionally the driver or architecture backend > > must handle the routing of broadcast ticks to the correct > > clock_event_device, leading to duplication of the list of active > > clock_event_devices. > > > > These patches introduce a generic mechanism for handling the receipt of > > timer broadcasts, and an optional architecture-specific broadcast > > function which allows drivers to be decoupled from a particular > > architecture will retaining support for timer tick broadcasts. These > > mechanisms are wired up for the arm port, and have been boot-tested on a > > pandaboard. > > > > For the series: > > Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Thanks!
> > -- > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, > hosted by The Linux Foundation > >
Mark.
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