linux-kernel - Re: [PATCH -tip FIXED] ftrace: add nop tracer

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Message-ID: <20080920061659.GF25713@elte.hu>
Date:	Sat, 20 Sep 2008 08:16:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Noonan <steven@...inklabs.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip FIXED] ftrace: add nop tracer


* Steven Noonan <steven@...inklabs.net> wrote:

> On Fri, Sep 19, 2008 at 2:23 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Fri, 19 Sep 2008 03:06:43 -0700
> > Steven Noonan <steven@...inklabs.net> wrote:
> >
> >> --- a/kernel/trace/trace.h
> >> +++ b/kernel/trace/trace.h
> >> @@ -339,6 +339,10 @@ extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
> >>  extern int trace_selftest_startup_wakeup(struct tracer *trace,
> >>                                        struct trace_array *tr);
> >>  #endif
> >> +#ifdef CONFIG_NOP_TRACER
> >> +extern int trace_selftest_startup_nop(struct tracer *trace,
> >> +                                      struct trace_array *tr);
> >> +#endif
> >>  #ifdef CONFIG_CONTEXT_SWITCH_TRACER
> >>  extern int trace_selftest_startup_sched_switch(struct tracer *trace,
> >>                                              struct trace_array *tr);
> >
> > Consider omitting the ifdefs around the declarations.
> >
> > pro: the code looks nicer and is less likely to suffer build errors
> > with weird config combinations.
> >
> > con: build errors are reported at link-time rather than at compile-time.
> >
> > Personally, I think pro>con here.
> >
> 
> I merely based this on one of the other tracers, so the ifdefs are
> basically copied and renamed.

yeah. Feel free to send a separate patch that implements Andrew's 
clean-up suggestion. I agree that pro>con.

	Ingo
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