linux-kernel - Re: [PATCH 2/2] tracing: Export ftrace API for kernel modules

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Date:	Tue, 15 Sep 2009 12:11:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Atsushi Tsuji <a-tsuji@...jp.nec.com>
Cc:	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	Ingo Molnar <mingo@...e.hu>, fweisbec@...il.com,
	"Frank Ch. Eigler" <fche@...hat.com>, paulus@...ba.org,
	systemtap@...rces.redhat.com
Subject: Re: [PATCH 2/2] tracing: Export ftrace API for kernel modules

On Tue, 2009-09-15 at 19:06 +0900, Atsushi Tsuji wrote:
> Export register_ and unresgister_ftrace_function_probe to modules. This can
> be used by SystemTap.

Its unusual to export bits without an in-kernel user.

> Signed-off-by: Atsushi Tsuji <a-tsuji@...jp.nec.com>
> ---
>  kernel/trace/ftrace.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 5ef8f59..9c32291 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -2042,6 +2042,7 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
>  
>  	return count;
>  }
> +EXPORT_SYMBOL_GPL(register_ftrace_function_probe);
>  
>  enum {
>  	PROBE_TEST_FUNC		= 1,
> @@ -2108,6 +2109,7 @@ unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
>  	__unregister_ftrace_function_probe(glob, ops, data,
>  					  PROBE_TEST_FUNC | PROBE_TEST_DATA);
>  }
> +EXPORT_SYMBOL_GPL(unregister_ftrace_function_probe);
>  
>  void
>  unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)

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