linux-kernel - Re: [PATCH 4/4] (RFC) X86: add IPI tracepoints

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Date:	Fri, 18 Jul 2014 16:59:50 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Ingo Molnar <mingo@...hat.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 4/4] (RFC) X86: add IPI tracepoints

On Fri, 18 Jul 2014, Steven Rostedt wrote:

> On Fri, 18 Jul 2014 01:18:55 -0400
> Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> 
>  
> > diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
> > index be8e1bde07..e154d176cf 100644
> > --- a/arch/x86/kernel/smp.c
> > +++ b/arch/x86/kernel/smp.c
> > @@ -31,6 +31,12 @@
> >  #include <asm/apic.h>
> >  #include <asm/nmi.h>
> >  #include <asm/trace/irq_vectors.h>
> > +
> > +#define CREATE_TRACE_POINTS
> > +#undef TRACE_INCLUDE_PATH
> > +#undef TRACE_INCLUDE_FILE
> 
> I'm curious to why you added the #undefs. I wouldn't think they were
> needed.

They are needed because asm/trace/irq_vectors.h included prior that 
point defines them for itself and that makes the inclusion of 
trace/events/ipi.h fail.

> -- Steve
> 
> > +#include <trace/events/ipi.h>
> > +
> >  /*
> >   *	Some notes on x86 processor bugs affecting SMP operation:
> >   *
> 
> 
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