Re: [PATCH v2 6/6] stop_machine: kill stop_cpus_lock and lg_double_lock/unlock()

[Peter Zijlstra]

On Sat, Aug 01, 2015 at 12:57:18PM +0200, Oleg Nesterov wrote:

> > > +	if (stop_work_pending(stopper1) != stop_work_pending(stopper2))
> > > +		goto unlock;
> >
> > You could DoS/false positive this by running stop_one_cpu() in a loop,
> > and thereby 'always' having work pending on one but not the other.
> 
> IIRC no. I am pretty sure stop_one_cpu() doesn't use stopper->stop_work,
> only stop_machine() does.

Urgh, I missed you were testing the cpu_stopper::stop_work not the
cpu_stopper::works list.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/