[kbuild-all] [peterz-queue:sched/cleanup 3/4] kernel/irq_work.c:77:6: warning: no previous prototype for 'irq_work_sync'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/cleanup head: 05dd40f3f6f4b06c16b9ad246e5a5523f10b4dff commit: 4e9ca7bd5bf21558cd143c975d0b636433548b98 [3/4] irq_work: Provide irq_work_queue_remote() config: arm64-allnoconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue sched/cleanup git checkout 4e9ca7bd5bf21558cd143c975d0b636433548b98 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm64 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 >>): 77 | void irq_work_sync(struct irq_work *work) | ^~~~~~~~~~~~~ vim +/irq_work_sync +77 kernel/irq_work.c 72 73 /* 74 * Synchronize against the irq_work @entry, ensures the entry is not 75 * currently in use. 76 */ 78 { 79 lockdep_assert_irqs_enabled(); 80 81 while (irq_work_is_busy(work)) 82 cpu_relax(); 83 } 84 EXPORT_SYMBOL_GPL(irq_work_sync); 85 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org