On Thu, Apr 15, 2010 at 04:03:58PM +0200, Ingo Molnar wrote:
> >
> >
> > diff --git a/kernel/lockdep.c b/kernel/lockdep.c
> > index 78325f8..65d4336 100644
> > --- a/kernel/lockdep.c
> > +++ b/kernel/lockdep.c
> > @@ -2298,7 +2298,11 @@ void trace_hardirqs_on_caller(unsigned long ip)
> > return;
> >
> > if (unlikely(curr->hardirqs_enabled)) {
> > + unsigned long flags;
> > +
> > + raw_local_irq_save(flags);
> > debug_atomic_inc(redundant_hardirqs_on);
> > + raw_local_irq_restore(flags);
> > return;
> > }
> > /* we'll do an OFF -> ON transition: */
>
> that looks rather ugly. Why not do a raw:
>
> this_cpu_inc(lockdep_stats.redundant_hardirqs_on);
>
> which basically open-codes debug_atomic_inc(), but without the warning?
There is also no guarantee we are in a non-preemptable section. We can then
also race against another cpu.
I'm not sure what to do.
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