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

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Date:	Fri, 19 Sep 2008 14:23:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Noonan <steven@...inklabs.net>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, steven@...inklabs.net
Subject: Re: [PATCH -tip FIXED] ftrace: add nop tracer

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.
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