Re: [PATCH] arch/x86: Fix the wrong format specifier

[kernel test robot]

Hi liujing,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/master]
[also build test WARNING on tip/x86/core tip/auto-latest linus/master v6.13-rc1 next-20241204]
[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/liujing/arch-x86-Fix-the-wrong-format-specifier/20241204-225811
base:   tip/master
patch link:    https://lore.kernel.org/r/20241204143322.7772-1-liujing%40cmss.chinamobile.com
patch subject: [PATCH] arch/x86: Fix the wrong format specifier
config: x86_64-buildonly-randconfig-006-20241205 (https://download.01.org/0day-ci/archive/20241205/202412050541.CvNgnYXM-lkp@xxxxxxxxx/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/20241205/202412050541.CvNgnYXM-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412050541.CvNgnYXM-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   arch/x86/kernel/hpet.c: In function 'hpet_late_init':
>> arch/x86/kernel/hpet.c:731:40: warning: '%u' directive writing between 1 and 10 bytes into a region of size 6 [-Wformat-overflow=]
     731 |                 sprintf(hc->name, "hpet%u", i);
         |                                        ^~
   In function 'hpet_select_clockevents',
       inlined from 'hpet_late_init' at arch/x86/kernel/hpet.c:1146:2:
   arch/x86/kernel/hpet.c:731:35: note: directive argument in the range [0, 4294967294]
     731 |                 sprintf(hc->name, "hpet%u", i);
         |                                   ^~~~~~~~
   arch/x86/kernel/hpet.c:731:17: note: 'sprintf' output between 6 and 15 bytes into a destination of size 10
     731 |                 sprintf(hc->name, "hpet%u", i);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +731 arch/x86/kernel/hpet.c

   703	
   704	static void __init hpet_select_clockevents(void)
   705	{
   706		unsigned int i;
   707	
   708		hpet_base.nr_clockevents = 0;
   709	
   710		/* No point if MSI is disabled or CPU has an Always Running APIC Timer */
   711		if (hpet_msi_disable || boot_cpu_has(X86_FEATURE_ARAT))
   712			return;
   713	
   714		hpet_print_config();
   715	
   716		hpet_domain = hpet_create_irq_domain(hpet_blockid);
   717		if (!hpet_domain)
   718			return;
   719	
   720		for (i = 0; i < hpet_base.nr_channels; i++) {
   721			struct hpet_channel *hc = hpet_base.channels + i;
   722			int irq;
   723	
   724			if (hc->mode != HPET_MODE_UNUSED)
   725				continue;
   726	
   727			/* Only consider HPET channel with MSI support */
   728			if (!(hc->boot_cfg & HPET_TN_FSB_CAP))
   729				continue;
   730	
 > 731			sprintf(hc->name, "hpet%u", i);
   732	
   733			irq = hpet_assign_irq(hpet_domain, hc, hc->num);
   734			if (irq <= 0)
   735				continue;
   736	
   737			hc->irq = irq;
   738			hc->mode = HPET_MODE_CLOCKEVT;
   739	
   740			if (++hpet_base.nr_clockevents == num_possible_cpus())
   741				break;
   742		}
   743	
   744		pr_info("%d channels of %d reserved for per-cpu timers\n",
   745			hpet_base.nr_channels, hpet_base.nr_clockevents);
   746	}
   747	

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