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Date: Fri, 28 Jan 2022 19:07:42 +0800 From: kernel test robot <lkp@...el.com> To: "Paul E. McKenney" <paulmck@...nel.org> Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org, GNU/Weeb Mailing List <gwml@...weeb.org>, linux-kernel@...r.kernel.org Subject: [ammarfaizi2-block:paulmck/linux-rcu/dev 94/94] kernel/rcu/srcutree.c:313:6: warning: no previous prototype for function 'spin_lock_irqsave_ssp_contention' tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev head: 903a93309e5a59497d3c178cabb67ecc6c843a69 commit: 903a93309e5a59497d3c178cabb67ecc6c843a69 [94/94] srcu: Add contention-triggered addition of srcu_node tree config: arm-s5pv210_defconfig (https://download.01.org/0day-ci/archive/20220128/202201281920.PD1buizH-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/ammarfaizi2/linux-block/commit/903a93309e5a59497d3c178cabb67ecc6c843a69 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev git checkout 903a93309e5a59497d3c178cabb67ecc6c843a69 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/rcu/ 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/rcu/srcutree.c:313:6: warning: no previous prototype for function 'spin_lock_irqsave_ssp_contention' [-Wmissing-prototypes] void spin_lock_irqsave_ssp_contention(struct srcu_struct *ssp, unsigned long *flags) ^ kernel/rcu/srcutree.c:313:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void spin_lock_irqsave_ssp_contention(struct srcu_struct *ssp, unsigned long *flags) ^ static 1 warning generated. vim +/spin_lock_irqsave_ssp_contention +313 kernel/rcu/srcutree.c 306 307 /* 308 * Acquire the specified srcu_struct structure's ->lock, but check for 309 * excessive contention, which results in initiation of a transition 310 * to SRCU_SIZE_BIG. But only if the srcutree.convert_to_big module 311 * parameter permits this. 312 */ > 313 void spin_lock_irqsave_ssp_contention(struct srcu_struct *ssp, unsigned long *flags) 314 { 315 unsigned long j; 316 317 if (spin_trylock_irqsave_rcu_node(ssp, *flags)) 318 return; 319 spin_lock_irqsave_rcu_node(ssp, *flags); 320 if (!(convert_to_big & 0x10) || ssp->srcu_size_state) 321 return; 322 j = jiffies; 323 if (ssp->srcu_size_jiffies != j) { 324 ssp->srcu_size_jiffies = j; 325 ssp->srcu_n_lock_retries = 0; 326 } 327 if (++ssp->srcu_n_lock_retries <= small_contention_lim) 328 return; 329 __srcu_transition_to_big(ssp); 330 } 331 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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