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

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Date:   Mon, 2 Aug 2021 21:12:53 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        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 8/2/21 12:58 AM, Daniel Bristot de Oliveira wrote:
> 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....

I'm OK with the latter...

thanks.