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

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Date:   Fri, 30 Jul 2021 18:11:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.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 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.

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


-- 
~Randy