[arnd-playground:more-default-warnings 23/47] kernel/trace/trace_osnoise.c:1999:8: warning: 'main' is usually a function

[arnd-playground:more-default-warnings 23/47] kernel/trace/trace_osnoise.c:1999:8: warning: 'main' is usually a function

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git more-default-warnings
head:   b86302da264f77971112b4be0b16eeb591026cbc
commit: 00e0c1d8a43a259e001163ce28c5d5813643eab2 [23/47] [SUBMITTED 20230811] extrawarn: do not disable -Wmain at W=1 level
config: x86_64-randconfig-076-20231111 (https://download.01.org/0day-ci/archive/20231111/202311111234.FEYPmd8T-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231111/202311111234.FEYPmd8T-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311111234.FEYPmd8T-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/trace/trace_osnoise.c: In function 'start_kthread':
>> kernel/trace/trace_osnoise.c:1999:8: warning: 'main' is usually a function [-Wmain]
     void *main = osnoise_main;
           ^~~~


vim +/main +1999 kernel/trace/trace_osnoise.c

c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1992  
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1993  /*
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1994   * start_kthread - Start a workload tread
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1995   */
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1996  static int start_kthread(unsigned int cpu)
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1997  {
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  1998  	struct task_struct *kthread;
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22 @1999  	void *main = osnoise_main;
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  2000  	char comm[24];
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2001  
ccb6754495ef25 Daniel Bristot de Oliveira 2021-10-31  2002  	if (timerlat_enabled()) {
a955d7eac1779b Daniel Bristot de Oliveira 2021-06-22  2003  		snprintf(comm, 24, "timerlat/%d", cpu);
a955d7eac1779b Daniel Bristot de Oliveira 2021-06-22  2004  		main = timerlat_main;
a955d7eac1779b Daniel Bristot de Oliveira 2021-06-22  2005  	} else {
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2006  		/* if no workload, just return */
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2007  		if (!test_bit(OSN_WORKLOAD, &osnoise_options)) {
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2008  			per_cpu(per_cpu_osnoise_var, cpu).sampling = true;
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2009  			barrier();
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2010  			return 0;
30838fcd81078d Daniel Bristot de Oliveira 2022-11-17  2011  		}
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2012  		snprintf(comm, 24, "osnoise/%d", cpu);
a955d7eac1779b Daniel Bristot de Oliveira 2021-06-22  2013  	}
ccb6754495ef25 Daniel Bristot de Oliveira 2021-10-31  2014  
11e4e3523da98c Cai Huoqing                2022-01-14  2015  	kthread = kthread_run_on_cpu(main, NULL, cpu, comm);
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2016  
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2017  	if (IS_ERR(kthread)) {
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2018  		pr_err(BANNER "could not start sampling thread\n");
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2019  		stop_per_cpu_kthreads();
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2020  		return -ENOMEM;
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2021  	}
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2022  
bce29ac9ce0bb0 Daniel Bristot de Oliveira 2021-06-22  2023  	per_cpu(per_cpu_osnoise_var, cpu).kthread = kthread;
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  2024  
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  2025  	return 0;
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  2026  }
c8895e271f7994 Daniel Bristot de Oliveira 2021-06-22  2027  

:::::: The code at line 1999 was first introduced by commit
:::::: c8895e271f7994a3ecb13b8a280e39aa53879545 trace/osnoise: Support hotplug operations

:::::: TO: Daniel Bristot de Oliveira <bristot@redhat.com>
:::::: CC: Steven Rostedt (VMware) <rostedt@goodmis.org>

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