linux-kernel - Re: [PATCH] tracing: Fix warning on variable 'struct trace

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Date:   Mon, 7 Nov 2022 09:17:29 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Aashish Sharma <shraash@...gle.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Arun Easi <aeasi@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: Fix warning on variable 'struct trace_array'

On Mon, Nov 07, 2022 at 09:35:56PM +0530, Aashish Sharma wrote:
> Move the declaration of 'struct trace_array' out of #ifdef
> CONFIG_TRACING block, to fix the following warning when CONFIG_TRACING
> is not set:
> 
> >> include/linux/trace.h:63:45: warning: 'struct trace_array' declared
> inside parameter list will not be visible outside of this definition or
> declaration
> 
> Fixes: 1a77dd1c2bb5 ("scsi: tracing: Fix compile error in trace_array calls when TRACING is disabled")
> Cc: Arun Easi <aeasi@...vell.com>
> Signed-off-by: Aashish Sharma <shraash@...gle.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  include/linux/trace.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/trace.h b/include/linux/trace.h
> index b5e16e438448..80ffda871749 100644
> --- a/include/linux/trace.h
> +++ b/include/linux/trace.h
> @@ -26,13 +26,13 @@ struct trace_export {
>  	int flags;
>  };
>  
> +struct trace_array;
> +
>  #ifdef CONFIG_TRACING
>  
>  int register_ftrace_export(struct trace_export *export);
>  int unregister_ftrace_export(struct trace_export *export);
>  
> -struct trace_array;
> -
>  void trace_printk_init_buffers(void);
>  __printf(3, 4)
>  int trace_array_printk(struct trace_array *tr, unsigned long ip,
> -- 
> 2.38.1.431.g37b22c650d-goog
>