On Thu, Aug 01, 2013 at 03:32:17PM +0200, Jiri Olsa wrote:
> On Thu, Aug 01, 2013 at 03:28:34PM +0200, Frederic Weisbecker wrote:
>
> SNIP
>
> > > also for following case:
> > >
> > > count = atomic_inc_return(&nr_callchain_events);
> > > if (WARN_ON_ONCE(count < 1)) {
> > > err = -EINVAL;
> > > goto exit;
> > > }
> > >
> > > seems like it screws the count
> >
> > I'm not sure what you mean here. You mean that it could be negative when
> > the dec is done
> > outside the lock?
>
> yes
>
I don't understand why.
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