Re: [PATCH v2] rcu: Keeping rcu-related kthreads running on housekeeping CPUS

[kernel test robot]

Hi Zqiang,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on paulmck-rcu/dev]
[also build test WARNING on next-20230209]
[cannot apply to linus/master v6.2-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zqiang/rcu-Keeping-rcu-related-kthreads-running-on-housekeeping-CPUS/20230209-182311
base:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
patch link:    https://lore.kernel.org/r/20230209102730.974465-1-qiang1.zhang%40intel.com
patch subject: [PATCH v2] rcu: Keeping rcu-related kthreads running on housekeeping CPUS
config: riscv-randconfig-r016-20230209 (https://download.01.org/0day-ci/archive/20230209/202302092209.AYjmQ4Id-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db0e6591612b53910a1b366863348bdb9d7d2fb1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/af15a3ade363b21d823918088623f8564cbd9d08
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zqiang/rcu-Keeping-rcu-related-kthreads-running-on-housekeeping-CPUS/20230209-182311
        git checkout af15a3ade363b21d823918088623f8564cbd9d08
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202302092209.AYjmQ4Id-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from kernel/torture.c:40:
>> kernel/rcu/rcu.h:509:6: warning: no previous prototype for function 'rcu_tasks_generic_setaffinity' [-Wmissing-prototypes]
   void rcu_tasks_generic_setaffinity(int cpu) {}
        ^
   kernel/rcu/rcu.h:509:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void rcu_tasks_generic_setaffinity(int cpu) {}
   ^
   static 
   1 warning generated.


vim +/rcu_tasks_generic_setaffinity +509 kernel/rcu/rcu.h

   484	
   485	#ifdef CONFIG_TINY_RCU
   486	/* Tiny RCU doesn't expedite, as its purpose in life is instead to be tiny. */
   487	static inline bool rcu_gp_is_normal(void) { return true; }
   488	static inline bool rcu_gp_is_expedited(void) { return false; }
   489	static inline bool rcu_async_should_hurry(void) { return false; }
   490	static inline void rcu_expedite_gp(void) { }
   491	static inline void rcu_unexpedite_gp(void) { }
   492	static inline void rcu_async_hurry(void) { }
   493	static inline void rcu_async_relax(void) { }
   494	static inline void rcu_request_urgent_qs_task(struct task_struct *t) { }
   495	#else /* #ifdef CONFIG_TINY_RCU */
   496	bool rcu_gp_is_normal(void);     /* Internal RCU use. */
   497	bool rcu_gp_is_expedited(void);  /* Internal RCU use. */
   498	bool rcu_async_should_hurry(void);  /* Internal RCU use. */
   499	void rcu_expedite_gp(void);
   500	void rcu_unexpedite_gp(void);
   501	void rcu_async_hurry(void);
   502	void rcu_async_relax(void);
   503	void rcupdate_announce_bootup_oddness(void);
   504	#ifdef CONFIG_TASKS_RCU_GENERIC
   505	void show_rcu_tasks_gp_kthreads(void);
   506	void rcu_tasks_generic_setaffinity(int cpu);
   507	#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
   508	static inline void show_rcu_tasks_gp_kthreads(void) {}
 > 509	void rcu_tasks_generic_setaffinity(int cpu) {}
   510	#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
   511	void rcu_request_urgent_qs_task(struct task_struct *t);
   512	#endif /* #else #ifdef CONFIG_TINY_RCU */
   513	

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