Messages in this thread | | | Date | Fri, 23 Mar 2012 11:22:46 +0530 | Subject | Re: Not able to use HIGH_RES_TIMERS on ARM | From | Ajeet Yadav <> |
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CCing to stable@vger.kernel.org On Fri, Mar 23, 2012 at 8:58 AM, John Stultz <john.stultz@linaro.org> wrote: > On 03/22/2012 03:25 AM, Ajeet Yadav wrote: >> >> If I set ARCH_USES_GETTIMEOFFSET=n to use this feature, my target >> fail to boot. (reason I well understand from our past discussions) > > And this point I'm not sure I'm following. Why exactly does disabling > ARCH_USES_GETTIMEOFFSET cause boot failures? Could you expand on the details > here? We did some dissection to narrow down the patch, our latest kernel is stable 3.0.X , however we backported patch " ARM: 7321/1: cache-v7: Disable preemption when reading CCSIDR" from 3.0.25 stable tree, this patch causes kernel hang during boot (IRQSOFF_TRACER=y and PREEMPT_TRACER=y) with 100% probability , if we remove this patch or disable the given CONFIG's then boot is success. > > You should just end up using the jiffies clocksource, which would give you > low-res HZ granular timestamps, but shouldn't get in the way of booting. > > thanks > -john > -- 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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