linux-kernel - [linux-rt-devel:linux-5.14.y-rt-rebase 242/262] kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for function 'rt_rwlock_is

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Message-ID: <202109050710.uwCdRL7c-lkp@intel.com>
Date:   Sun, 5 Sep 2021 07:36:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [linux-rt-devel:linux-5.14.y-rt-rebase 242/262]
 kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for
 function 'rt_rwlock_is_contended'

Hi Sebastian,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.14.y-rt-rebase
head:   654401743eaa08fb02fd57e7ca86dfeb16a8264f
commit: 4e1854e1da111e0c0c6bf1969677f61abdbb4363 [242/262] x86: Allow to enable RT
config: x86_64-buildonly-randconfig-r001-20210905 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6fe2beba7d2a41964af658c8c59dd172683ef739)
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/rt/linux-rt-devel.git/commit/?id=4e1854e1da111e0c0c6bf1969677f61abdbb4363
        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-5.14.y-rt-rebase
        git checkout 4e1854e1da111e0c0c6bf1969677f61abdbb4363
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> kernel/locking/spinlock_rt.c:249:13: warning: no previous prototype for function 'rt_rwlock_is_contended' [-Wmissing-prototypes]
   int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
               ^
   kernel/locking/spinlock_rt.c:249:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
   ^
   static 
   1 warning generated.


vim +/rt_rwlock_is_contended +249 kernel/locking/spinlock_rt.c

ca72c3eba593af Thomas Gleixner 2021-08-15  248  
ca72c3eba593af Thomas Gleixner 2021-08-15 @249  int __sched rt_rwlock_is_contended(rwlock_t *rwlock)
ca72c3eba593af Thomas Gleixner 2021-08-15  250  {
ca72c3eba593af Thomas Gleixner 2021-08-15  251  	return rw_base_is_contended(&rwlock->rwbase);
ca72c3eba593af Thomas Gleixner 2021-08-15  252  }
ca72c3eba593af Thomas Gleixner 2021-08-15  253  EXPORT_SYMBOL(rt_rwlock_is_contended);
ca72c3eba593af Thomas Gleixner 2021-08-15  254  

:::::: The code at line 249 was first introduced by commit
:::::: ca72c3eba593af8b6cce096b656c6cebd412d9b6 locking/rwlock: Provide RT variant

:::::: TO: Thomas Gleixner <tglx@...utronix.de>
:::::: CC: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

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

Download attachment ".config.gz" of type "application/gzip" (46547 bytes)