tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev
head:   636c9bc361b1f0acdb57c2b0deb131ea57896cc9
commit: f1c73cc03a10ba8300792eb9cbd0686614efd2b2 [39/42] rcu-tasks: Report stalls during synchronize_srcu() in rcu_tasks_postscan()
config: arm-randconfig-c002-20230112
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 8d9828ef5aa9688500657d36cd2aefbe12bbd162)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/f1c73cc03a10ba8300792eb9cbd0686614efd2b2
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev
        git checkout f1c73cc03a10ba8300792eb9cbd0686614efd2b2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

Note: the ammarfaizi2-block/paulmck/linux-rcu/dev HEAD 636c9bc361b1f0acdb57c2b0deb131ea57896cc9 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/update.c:611:
>> kernel/rcu/tasks.h:944:3: error: call to undeclared function 'tasks_gp_state_getname'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   tasks_gp_state_getname(&rcu_tasks), jiffies - rcu_tasks.gp_jiffies);
                   ^
   kernel/rcu/tasks.h:944:3: warning: format specifies type 'char *' but the argument has type 'int' [-Wformat]
                   tasks_gp_state_getname(&rcu_tasks), jiffies - rcu_tasks.gp_jiffies);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/printk.h:530:34: note: expanded from macro 'pr_info'
           printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
                                   ~~~     ^~~~~~~~~~~
   include/linux/printk.h:457:60: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ~~~    ^~~~~~~~~~~
   include/linux/printk.h:429:19: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ~~~~    ^~~~~~~~~~~
   1 warning and 1 error generated.


vim +/tasks_gp_state_getname +944 kernel/rcu/tasks.h

   937	
   938	static void tasks_rcu_exit_srcu_stall(struct timer_list *unused)
   939	{
   940		int rtsi = READ_ONCE(rcu_task_stall_info);
   941	
   942		pr_info("%s: %s grace period number %lu (since boot) gp_state: %s is %lu jiffies old.\n",
   943			__func__, rcu_tasks.kname, rcu_tasks.tasks_gp_seq,
 > 944			tasks_gp_state_getname(&rcu_tasks), jiffies - rcu_tasks.gp_jiffies);
   945		pr_info("Please check any exiting tasks stuck between calls to exit_tasks_rcu_start() and exit_tasks_rcu_finish()\n");
   946		tasks_rcu_exit_srcu_stall_timer.expires = jiffies + rtsi;
   947		add_timer(&tasks_rcu_exit_srcu_stall_timer);
   948	}
   949	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests