[linux-rt-devel:linux-5.13.y-rt-testing 223/226] kernel/locking/rtmutex_api.c:501: warning: expecting prototype for rwsem_rt_mutex_try_lock(). Prototype was for rwsem_rt_mutex_trylock() instead

kernel test robot
2021-07-10T02:22:28Z

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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/commit/?id=8babe6924dddf3c0e3ac5390630c4905c7ea7c73
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@intel.com>

All warnings (new ones prefixed by >>):

>> kernel/locking/rtmutex_api.c:501: warning: expecting prototype for rwsem_rt_mutex_try_lock(). Prototype was for rwsem_rt_mutex_trylock() instead

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@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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