Messages in this thread | | | Subject | Re: [PATCH v4 2/5] ARC: clocksource: DT based probe | From | Vineet Gupta <> | Date | Thu, 14 Apr 2016 15:06:10 +0530 |
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On Thursday 14 April 2016 03:02 PM, Marc Zyngier wrote: >> This is clocksource, not clockevent. cs needs to synchronized across all cores so >> > that concurrent gtod call from threads on different cores gives you similar >> > values. This obviously is not true for the local RTC hardware timer. > Unsynchronized counters on SMP HW, who would have thought! ;-) I guess > each and every architecture has to repeat the same mistakes.
Not really - hardware wise the SMP support is pretty recent and before that we only had UP cores. So transition from 32 TIMER1 to 64 bit RTC was only a natural progression in improvements and in theory SoC guys throw in this local timer into the config. We just prevent SMP linux from using it.
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