linux-kernel - Re: [PATCH] trace: eradicate noisy warning in trace

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Message-ID: <20210730204050.46975ae2@oasis.local.home>
Date:   Fri, 30 Jul 2021 20:40:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH] trace: eradicate noisy warning in trace_osnoise.c

On Fri, 30 Jul 2021 17:00:55 -0700
Randy Dunlap <rdunlap@...radead.org> wrote:

> OK, I'm officially tired of this noise warning coming from
> trace_osnoise.c, so shut it up. Also, adding new warnings is not OK.

I agree adding "new warnings" is not OK, but this is a stupid warning.

> 
> ../kernel/trace/trace_osnoise.c: In function ‘start_kthread’:
> ../kernel/trace/trace_osnoise.c:1461:8: warning: ‘main’ is usually a function [-Wmain]
>   void *main = osnoise_main;
>         ^~~~
> 
> Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Suggested-by: Matthew Wilcox <willy@...radead.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
> ---
>  kernel/trace/Makefile |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- mmotm-2021-0728-1824.orig/kernel/trace/Makefile
> +++ mmotm-2021-0728-1824/kernel/trace/Makefile
> @@ -36,6 +36,8 @@ CFLAGS_bpf_trace.o := -I$(src)
>  CFLAGS_trace_benchmark.o := -I$(src)
>  CFLAGS_trace_events_filter.o := -I$(src)
>  
> +CFLAGS_trace_osnoise.o := -Wno-main

Why just add it here. It's a silly warning to have for the kernel at
all. Should this not be added in a more global place?

-- Steve


> +
>  obj-$(CONFIG_TRACE_CLOCK) += trace_clock.o
>  
>  obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o