tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git rtmutex head: 238baaf7afb02f83cf7f455b92b2c6ed961d43cd commit: e94c1ba2ec1dc10b7f54dfa6163a5ca4fdd3655d [12/14] locking/rtmutex: Consolidate the fast/slowpath invocation config: s390-randconfig-r025-20210323 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 78a65cd945d006ff02f9d24d9cc20a302ed93b08) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel rtmutex git checkout e94c1ba2ec1dc10b7f54dfa6163a5ca4fdd3655d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): __rt_mutex_lock(lock); ~~~~~~~~~~~~~~~ ^ kernel/locking/rtmutex.c:1384:28: note: '__rt_mutex_lock' declared here static __always_inline int __rt_mutex_lock(struct rt_mutex *lock, long state) ^ 1 error generated. vim +1410 kernel/locking/rtmutex.c 1399 1400 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1401 /** 1402 * rt_mutex_lock_nested - lock a rt_mutex 1403 * 1404 * @lock: the rt_mutex to be locked 1405 * @subclass: the lockdep subclass 1406 */ 1407 void __sched rt_mutex_lock_nested(struct rt_mutex *lock, unsigned int subclass) 1408 { 1409 mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); 1411 } 1412 EXPORT_SYMBOL_GPL(rt_mutex_lock_nested); 1413 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org