Re: [PATCH] timers: Exclude isolated cpus from timer migation

[kernel test robot <lkp@intel.com>]

Hi Gabriele,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 3b07108ada81a8ebcebf1fe61367b4e436c895bd]

url:    https://github.com/intel-lab-lkp/linux/commits/Gabriele-Monaco/timers-Exclude-isolated-cpus-from-timer-migation/20250410-145629
base:   3b07108ada81a8ebcebf1fe61367b4e436c895bd
patch link:    https://lore.kernel.org/r/20250410065446.57304-2-gmonaco%40redhat.com
patch subject: [PATCH] timers: Exclude isolated cpus from timer migation
config: csky-randconfig-001-20250411 (https://download.01.org/0day-ci/archive/20250411/202504111433.IwFLpkrz-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250411/202504111433.IwFLpkrz-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/202504111433.IwFLpkrz-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/uprobes.h:18,
                    from include/linux/mm_types.h:16,
                    from include/linux/mmzone.h:22,
                    from include/linux/topology.h:33,
                    from include/linux/irq.h:19,
                    from include/asm-generic/hardirq.h:17,
                    from ./arch/csky/include/generated/asm/hardirq.h:1,
                    from include/linux/hardirq.h:11,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:8,
                    from arch/csky/kernel/asm-offsets.c:5:
   include/linux/timer.h: In function 'tmigr_isolated_exclude_cpumask':
>> include/linux/timer.h:196:1: warning: no return statement in function returning non-void [-Wreturn-type]
     196 | static inline int tmigr_isolated_exclude_cpumask(cpumask_var_t exclude_cpumask) { }
         | ^~~~~~
--
   In file included from include/linux/uprobes.h:18,
                    from include/linux/mm_types.h:16,
                    from include/linux/mmzone.h:22,
                    from include/linux/topology.h:33,
                    from include/linux/irq.h:19,
                    from include/asm-generic/hardirq.h:17,
                    from ./arch/csky/include/generated/asm/hardirq.h:1,
                    from include/linux/hardirq.h:11,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:8,
                    from arch/csky/kernel/asm-offsets.c:5:
   include/linux/timer.h: In function 'tmigr_isolated_exclude_cpumask':
>> include/linux/timer.h:196:1: warning: no return statement in function returning non-void [-Wreturn-type]
     196 | static inline int tmigr_isolated_exclude_cpumask(cpumask_var_t exclude_cpumask) { }
         | ^~~~~~


vim +196 include/linux/timer.h

   192	
   193	#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
   194	extern int tmigr_isolated_exclude_cpumask(cpumask_var_t exclude_cpumask);
   195	#else
 > 196	static inline int tmigr_isolated_exclude_cpumask(cpumask_var_t exclude_cpumask) { }
   197	#endif
   198	

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