linux-kernel - Re: [PATCH 25/46] kernel: Add prototype declaration to header file include/linux/ftrace.h

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Message-ID: <20140227143753.42451556@gandalf.local.home>
Date:	Thu, 27 Feb 2014 14:37:53 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rashika Kheria <rashika.kheria@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, josh@...htriplett.org
Subject: Re: [PATCH 25/46] kernel: Add prototype declaration to header file
 include/linux/ftrace.h

On Thu, 27 Feb 2014 17:32:47 +0530
Rashika Kheria <rashika.kheria@...il.com> wrote:

> Add prototype declaration of function to header file
> include/linux/ftrace.h because it is used by more than one file.
> 
> This eliminates the following warning in kernel/trace/ftrace.c:
> kernel/trace/ftrace.c:4914:5: warning: no previous prototype for ‘ftrace_graph_entry_stub’ [-Wmissing-prototypes]
> 
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>
> Reviewed-by: Josh Triplett <josh@...htriplett.org>
> ---
>  include/linux/ftrace.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index 68ea184..da1c31f 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -672,6 +672,8 @@ struct ftrace_graph_ret {
>  typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
>  typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
>  
> +int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);

This doesn't need to be in a header file as it is only called by
assmebly. But I have no problems with it being in one, but it should
have a comment stating this:

/* This is only called by assembly code, declared here for consistency */

-- Steve

> +
>  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
>  
>  /* for init task */

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