Messages in this thread | | | Date | Sat, 27 Jan 2007 13:48:51 +0100 | From | Stefan Richter <> | Subject | Re: [RFC] cycle timer read extension for raw1394/libraw1394 |
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Pieter Palmers wrote: > Stefan Richter wrote: >> Thus? >> preempt_disable(); >> local_irq_save(flags); >> >> read_cycle_timer; >> read_time_of_day; >> >> local_irq_restore(flags); >> preempt_enable(); >> >> in hpsb_read_cycle_timer. > My main issue was that I still had to figure out how to do this... I'm a > very occasional kernel space programmer.
Unfortunately me too, and the level of ieee1394 driver maintenance shows it.
> Thanks for the hint, I'll do it like this. > > I still have to check if I don't introduce a too long non-preemptible > path though.
It's a simple MMIO read (readl) and the do_gettimeofday, which should be fine. -- Stefan Richter -=====-=-=== ---= ==-== http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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