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    SubjectRe: [REGRESSION, i915]: Periodic stalls with 2.6.36-rc2
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    On Tue, 24 Aug 2010 09:49:02 +0100, Sitsofe Wheeler <sitsofe@yahoo.com> wrote:
    > On Tue, Aug 24, 2010 at 09:16:50AM +0100, Chris Wilson wrote:
    > >
    > > Ok, I'm a little happier that the hangcheck could be just another symptom
    > > of the problem...
    > >
    > > I think it is safe to assume that the bug is in i915, so restricting the
    > > bisect to just drm seems plausible:
    > >
    > > git bisect start drivers/gpu/drm
    > > git bisect good 2.6.36-rc1
    > > git bisect bad 2.6.36-rc2
    >
    > I should mention that I ran a similar bisect yesterday but it led to a dead
    > end:
    [snip]
    > All the bad kernels above boot EXTREMELY slowly and it's not clear why. Using
    > the results above to run your tests produced the following:

    I was hoping that git would be more intelligent than that. Is there a way
    to simply bisect down one side of a merge?

    The slow boot is probably fixed by 4936a3b90d79dd8775c6ac23c2cf2dcebe29abde.
    A trivial patch you can apply on each step is:

    diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
    index 33dbcc4..88f3b6c 100644
    --- a/arch/x86/kernel/hpet.c
    +++ b/arch/x86/kernel/hpet.c
    @@ -837,7 +837,7 @@ static int hpet_clocksource_register(void)
    * cyc/sec = FSEC_PER_SEC/hpet_period(fsec/cyc)
    * cyc/sec = (FSEC_PER_NSEC * NSEC_PER_SEC)/hpet_period
    */
    - hpet_freq = FSEC_PER_NSEC * NSEC_PER_SEC;
    + hpet_freq = (u64) FSEC_PER_NSEC * NSEC_PER_SEC;
    do_div(hpet_freq, hpet_period);
    clocksource_register_hz(&clocksource_hpet, (u32)hpet_freq);

    --
    Chris Wilson, Intel Open Source Technology Centre

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