Re: [PATCH 16/20] sched/idle: Use explicit broadcast oneshot control function

[Sudeep Holla]

On 28/04/15 11:11, Linus Walleij wrote:
> On Thu, Apr 2, 2015 at 12:22 AM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>
> > From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> >
> > Replace the clockevents_notify() call with an explicit function call.
> >
> > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> For some reason this makes my Ux500 system arbitrarily hang,
> especially during boot. Bisected down to this commit.
> Since the entire changeset is removing the notifications
> altogether I can't just revert it.
>
> Disabling CONFIG_CPU_IDLE removes the problem.
>
> Tried registering a stub driver (I just #if 0 all the code in
> drivers/cpuidle/cpuidle-ux500.c) it still crashes.
>
> That makes me think something inside the cpuidle subsystem
> is locking up after this, but my other idea is that the timer
> may be involved in some way, like this is stressing the timer
> in some new yet untested way.
>
> Has anyone else seen problems with this or is it only
> ux500?
>
> I'm looking closer at it but feel a bit clueless...

Yes I am too in similar situation with my Vexpress platform.
I did report with the lockdep logs[1] before v4.1-rc1.
I still see the issue with v4.1-rc1.

Regards,
Sudeep

[1] https://lkml.org/lkml/2015/4/23/329
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