linux-kernel - Re: [PATCH] tracing: Fix -Wundef around 'struct event_mod

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Message-ID: <20250120123601.36aea213@gandalf.local.home>
Date: Mon, 20 Jan 2025 12:36:01 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, llvm@...ts.linux.dev,
 patches@...ts.linux.dev, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] tracing: Fix -Wundef around 'struct event_mod_load'

On Mon, 20 Jan 2025 05:29:24 -0700
Nathan Chancellor <nathan@...nel.org> wrote:

> When CONFIG_MODULES is disabled, clang warns:
> 
>   kernel/trace/trace_events.c:872:5: warning: 'CONFIG_MODULES' is not defined, evaluates to 0 [-Wundef]
>     872 | #if CONFIG_MODULES
>         |     ^
> 
> Use '#ifdef' to resolve the warning.
> 
> Fixes: b355247df104 ("tracing: Cache ":mod:" events for modules not loaded yet")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202501190121.E2CIJuUj-lkp@intel.com/
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Yes yes, I had this fixed locally but never tested nor pushed it out. :-p

Thanks,

-- Steve

> ---
>  kernel/trace/trace_events.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index ab04994e4510..de934332ba36 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -869,7 +869,7 @@ static int ftrace_event_enable_disable(struct trace_event_file *file,
>  	return __ftrace_event_enable_disable(file, enable, 0);
>  }
>  
> -#if CONFIG_MODULES
> +#ifdef CONFIG_MODULES
>  struct event_mod_load {
>  	struct list_head	list;
>  	char			*module;
> 
> ---
> base-commit: 9f3ccaeedbe0088f1b89474bcf4187c49cfe8de2
> change-id: 20250120-trace_events-fix-wundef-7a1153105f5f
> 
> Best regards,