tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.13.y-rt-testing head: db8ae8e3fd71ddc8103a71d002780bed20e5d9de commit: 8babe6924dddf3c0e3ac5390630c4905c7ea7c73 [223/226] locking/rt: Fix kernel doc for rwsem_rt_mutex_try_lock() config: x86_64-randconfig-a015-20210709 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.13.y-rt-testing git checkout 8babe6924dddf3c0e3ac5390630c4905c7ea7c73 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/locking/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +501 kernel/locking/rtmutex_api.c e03cbdcf154edd Thomas Gleixner 2021-07-06 491 e03cbdcf154edd Thomas Gleixner 2021-07-06 492 /** 8babe6924dddf3 Thomas Gleixner 2021-07-09 493 * rwsem_rt_mutex_try_lock - Try to lock a rt_mutex e03cbdcf154edd Thomas Gleixner 2021-07-06 494 * @lock: The rt_mutex to be locked e03cbdcf154edd Thomas Gleixner 2021-07-06 495 * e03cbdcf154edd Thomas Gleixner 2021-07-06 496 * The function does no lockdep operations on @lock. The lockdep state e03cbdcf154edd Thomas Gleixner 2021-07-06 497 * changes have to be done on the callsite related to the locking primitive e03cbdcf154edd Thomas Gleixner 2021-07-06 498 * which embeds the rtmutex. Otherwise lockdep has double tracking. e03cbdcf154edd Thomas Gleixner 2021-07-06 499 */ e03cbdcf154edd Thomas Gleixner 2021-07-06 500 int __sched rwsem_rt_mutex_trylock(struct rt_mutex *lock) e03cbdcf154edd Thomas Gleixner 2021-07-06 @501 { e03cbdcf154edd Thomas Gleixner 2021-07-06 502 if (IS_ENABLED(CONFIG_DEBUG_RT_MUTEXES) && e03cbdcf154edd Thomas Gleixner 2021-07-06 503 WARN_ON_ONCE(in_nmi() | in_hardirq())) e03cbdcf154edd Thomas Gleixner 2021-07-06 504 return 0; e03cbdcf154edd Thomas Gleixner 2021-07-06 505 e03cbdcf154edd Thomas Gleixner 2021-07-06 506 if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) e03cbdcf154edd Thomas Gleixner 2021-07-06 507 return 1; e03cbdcf154edd Thomas Gleixner 2021-07-06 508 e03cbdcf154edd Thomas Gleixner 2021-07-06 509 return rt_mutex_slowtrylock(lock); e03cbdcf154edd Thomas Gleixner 2021-07-06 510 } e03cbdcf154edd Thomas Gleixner 2021-07-06 511 :::::: The code at line 501 was first introduced by commit :::::: e03cbdcf154eddbc014705b6e2ebacd755d6ab39 locking/rtmutex: Provide lockdep less variants of rtmutex interfaces :::::: TO: Thomas Gleixner <tglx(a)linutronix.de&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org