Re: [PATCH RFC v2] rcu: Add a minimum time for marking boot as completed

[kernel test robot <lkp@intel.com>]

Hi Joel,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on paulmck-rcu/dev]
[also build test ERROR on linus/master v6.2 next-20230225]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Joel-Fernandes-Google/rcu-Add-a-minimum-time-for-marking-boot-as-completed/20230225-113519
base:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
patch link:    https://lore.kernel.org/r/20230225033421.3323164-1-joel%40joelfernandes.org
patch subject: [PATCH RFC v2] rcu: Add a minimum time for marking boot as completed
config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20230225/202302251903.JJF7dBwl-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/e42e553f5b94f064331b1cff0af0ea6f55ffe1b4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Joel-Fernandes-Google/rcu-Add-a-minimum-time-for-marking-boot-as-completed/20230225-113519
        git checkout e42e553f5b94f064331b1cff0af0ea6f55ffe1b4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302251903.JJF7dBwl-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: kernel/rcu/update.o: in function `rcu_end_inkernel_boot':
>> kernel/rcu/update.c:246: undefined reference to `__udivdi3'
>> ld: kernel/rcu/update.c:246: undefined reference to `__udivdi3'


vim +246 kernel/rcu/update.c

   242	
   243	void rcu_end_inkernel_boot(void)
   244	{
   245		if (boot_end_delay) {
 > 246			u64 boot_ms = ktime_get_boot_fast_ns() / 1000000UL;
   247	
   248			if (boot_ms < boot_end_delay) {
   249				schedule_delayed_work(&boot_rcu_work,
   250						boot_end_delay - boot_ms);
   251				return;
   252			}
   253		}
   254	
   255		rcu_unexpedite_gp();
   256		rcu_async_relax();
   257		if (rcu_normal_after_boot)
   258			WRITE_ONCE(rcu_normal, 1);
   259		rcu_boot_ended = true;
   260	}
   261	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests