Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 15 Apr 2010 19:24:22 +0200 | From | Frederic Weisbecker <> | Subject | Re: linux-next: PowerPC WARN_ON_ONCE() after merge of the final tree (tip related) |
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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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