Re: [PATCH v4 2/5] ARC: clocksource: DT based probe

[Vineet Gupta]

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.