Re: [PATCH 1/3] watchdog/softlockup: low-overhead detection of interrupt storm

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

Hi Bitao,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/irq/core]
[also build test ERROR on linus/master v6.8-rc1 next-20240125]
[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/Bitao-Hu/watchdog-softlockup-low-overhead-detection-of-interrupt-storm/20240123-201509
base:   tip/irq/core
patch link:    https://lore.kernel.org/r/20240123121223.22318-2-yaoma%40linux.alibaba.com
patch subject: [PATCH 1/3] watchdog/softlockup: low-overhead detection of interrupt storm
config: i386-randconfig-013-20240126 (https://download.01.org/0day-ci/archive/20240126/202401261310.Ixxefn7o-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240126/202401261310.Ixxefn7o-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401261310.Ixxefn7o-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: kernel/watchdog.o: in function `print_cpustat':
>> kernel/watchdog.c:453: undefined reference to `__udivdi3'
>> ld: kernel/watchdog.c:457: undefined reference to `__udivdi3'


vim +453 kernel/watchdog.c

   446	
   447	static void print_cpustat(void)
   448	{
   449		int i, j, k;
   450		u64 a[5][NR_STATS], b[5][NR_STATS];
   451		u64 (*diff)[NR_STATS] = this_cpu_ptr(cpustat_diff);
   452		int tail = this_cpu_read(cpustat_tail);
 > 453		u32 period_us = sample_period / 1000;
   454	
   455		for (i = 0; i < 5; i++) {
   456			for (j = 0; j < NR_STATS; j++) {
 > 457				a[i][j] = 100 * (diff[i][j] / 1000);
   458				b[i][j] = 10 * do_div(a[i][j], period_us);
   459				do_div(b[i][j], period_us);
   460			}
   461		}
   462		printk(KERN_CRIT "CPU#%d Utilization every %us during lockup:\n",
   463			smp_processor_id(), period_us/1000000);
   464		for (k = 0, i = tail; k < 5; k++, i = (i + 1) % 5) {
   465			printk(KERN_CRIT "\t#%d: %llu.%llu%% system,\t%llu.%llu%% softirq,\t"
   466				"%llu.%llu%% hardirq,\t%llu.%llu%% idle\n", k+1,
   467				a[i][CPUTIME_SYSTEM], b[i][CPUTIME_SYSTEM],
   468				a[i][CPUTIME_SOFTIRQ], b[i][CPUTIME_SOFTIRQ],
   469				a[i][CPUTIME_IRQ], b[i][CPUTIME_IRQ],
   470				a[i][CPUTIME_IDLE], b[i][CPUTIME_IDLE]);
   471		}
   472	}
   473	#else
   474	static inline void update_cpustat(void) { }
   475	static inline void print_cpustat(void) { }
   476	#endif
   477	

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