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

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Date:   Mon, 2 Aug 2021 09:58:33 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] trace: eradicate noisy warning in trace_osnoise.c

On 7/31/21 3:11 AM, Randy Dunlap wrote:
> On 7/30/21 5:40 PM, Steven Rostedt wrote:
>> 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?
> I don't know of any other places that name something 'main' when it is
> not a main() function.
> 

I would say that we either use -Wno-main for the entire kernel or rename the
main variable to tracer_main....

-- Daniel