Messages in this thread | | | Date | Thu, 20 Oct 2005 10:59:55 +0200 | From | Ingo Molnar <> | Subject | Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards. |
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* Steven Rostedt <rostedt@goodmis.org> wrote:
> static inline nsec_t __get_nsec_offset(void) > { > cycle_t cycle_now, cycle_delta; > nsec_t ns_offset; > > /* read clocksource */ > cycle_now = read_clocksource(clock); > > /* calculate the delta since the last timeofday_periodic_hook */ > cycle_delta = (cycle_now - cycle_last) & clock->mask; > > /* convert to nanoseconds */ > ns_offset = cyc2ns(clock, ntp_adj, cycle_delta); > > /* Special case for jiffies tick/offset based systems > * add arch specific offset > */ > ns_offset += arch_getoffset(); > > return ns_offset; > } > > cycle_now is 32 bits. If the clocksource overflows (which it can in > 30 seconds) the cyclec_delta will be wrong.
isnt cycle_t 64 bits?
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