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    SubjectRe: Not able to use HIGH_RES_TIMERS on ARM
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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
    >
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