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    SubjectRe: [PATCH 2/8] perf: Sanitize get_callchain_buffer()
    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



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