Re: [PATCH v7 2/2] tracing: Add support for preempt and irq enable/disable events

[Steven Rostedt]

On Wed, 4 Oct 2017 18:04:34 +0200
Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> On Fri, Sep 29, 2017 at 02:22:45PM -0700, Joel Fernandes wrote:
> > +++ b/kernel/trace/trace_irqsoff.c  
> 
> >  EXPORT_SYMBOL(trace_hardirqs_on);
> >  EXPORT_SYMBOL(trace_hardirqs_off);
> >  EXPORT_SYMBOL(trace_hardirqs_on_caller);
> >  EXPORT_SYMBOL(trace_hardirqs_off_caller);  
> 
> Steve, how does this compiler with lockdep enabled? Because:
> 
> kernel/locking/lockdep.c:EXPORT_SYMBOL(trace_hardirqs_on_caller);
> kernel/locking/lockdep.c:EXPORT_SYMBOL(trace_hardirqs_on);
> kernel/locking/lockdep.c:EXPORT_SYMBOL(trace_hardirqs_off_caller);
> kernel/locking/lockdep.c:EXPORT_SYMBOL(trace_hardirqs_off);

I'll have to see if it does, I haven't applied them yet. Looks like
they were removed from the:

#ifdef CONFIG_PROVE_LOCKING

[..]

#else /* !CONFIG_PROVE_LOCKING */

<here>

#endif


I don't see the protection in the patches. I will definitely test that
before pushing it anywhere.

-- Steve