On Wed, May 18, 2022 at 08:00:00PM +0800, kernel test robot wrote:
> tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev
> head:   9a9671fb7a3966dfc7dc67f6aa80acdfe185d72d
> commit: 7c98805ebf93263213dac7b52846d73cebe983f3 [43/51] tasks-rcu: Track blocked RCU Tasks Trace readers
> config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20220518/202205181919.oILbHBZa-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 11.3.0
> 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
>         # https://github.com/ammarfaizi2/linux-block/commit/7c98805ebf93263213dac7b52846d73cebe983f3
>         git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
>         git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev
>         git checkout 7c98805ebf93263213dac7b52846d73cebe983f3
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> ERROR: modpost: "rcu_tasks_trace_qs_blkd" [kernel/torture.ko] undefined!
> >> ERROR: modpost: "rcu_tasks_trace_qs_blkd" [kernel/rcu/rcuscale.ko] undefined!

Good catch, folding an EXPORT_SYMBOL_GPL() into the original commit
with attribution, thank you!

							Thanx, Paul