[rostedt-trace:ftrace/core 5/27] ERROR: modpost: "del_timer_free" [drivers/bluetooth/hci_uart.ko] undefined!

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/core
head:   34013efca7a53dc163483fae58c114bd8b2c47f4
commit: c0c1fa7de9ef7b30b95044910ce8b115e24dbb20 [5/27] timers: Add del_time_free() to be called before freeing timer
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20220426/202204262014.jLVxAaWT-lkp@intel.com/config)
compiler: powerpc-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://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=c0c1fa7de9ef7b30b95044910ce8b115e24dbb20
        git remote add rostedt-trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
        git fetch --no-tags rostedt-trace ftrace/core
        git checkout c0c1fa7de9ef7b30b95044910ce8b115e24dbb20
        # 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=powerpc 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: "del_timer_free" [drivers/bluetooth/hci_uart.ko] undefined!

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp