Re: [PATCH 1/7] serial: sc16is7xx: fix snprintf format specifier in sc16is7xx_regmap_name()

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

Hi Hugo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d804987153e7bedf503f8e4ba649afe52cfd7f6d]

url:    https://github.com/intel-lab-lkp/linux/commits/Hugo-Villeneuve/serial-sc16is7xx-fix-snprintf-format-specifier-in-sc16is7xx_regmap_name/20231201-031413
base:   d804987153e7bedf503f8e4ba649afe52cfd7f6d
patch link:    https://lore.kernel.org/r/20231130191050.3165862-2-hugo%40hugovil.com
patch subject: [PATCH 1/7] serial: sc16is7xx: fix snprintf format specifier in sc16is7xx_regmap_name()
config: x86_64-buildonly-randconfig-001-20231201 (https://download.01.org/0day-ci/archive/20231206/202312061443.Cknef7Uq-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/20231206/202312061443.Cknef7Uq-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/202312061443.Cknef7Uq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/tty/serial/sc16is7xx.c: In function 'sc16is7xx_i2c_probe':
>> drivers/tty/serial/sc16is7xx.c:1703:41: warning: '%u' directive output may be truncated writing between 1 and 10 bytes into a region of size 2 [-Wformat-truncation=]
    1703 |         snprintf(buf, sizeof(buf), "port%u", port_id);
         |                                         ^~
   In function 'sc16is7xx_regmap_name',
       inlined from 'sc16is7xx_i2c_probe' at drivers/tty/serial/sc16is7xx.c:1805:17:
   drivers/tty/serial/sc16is7xx.c:1703:36: note: directive argument in the range [0, 4294967294]
    1703 |         snprintf(buf, sizeof(buf), "port%u", port_id);
         |                                    ^~~~~~~~
   drivers/tty/serial/sc16is7xx.c:1703:9: note: 'snprintf' output between 6 and 15 bytes into a destination of size 6
    1703 |         snprintf(buf, sizeof(buf), "port%u", port_id);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +1703 drivers/tty/serial/sc16is7xx.c

  1698	
  1699	static const char *sc16is7xx_regmap_name(unsigned int port_id)
  1700	{
  1701		static char buf[6];
  1702	
> 1703		snprintf(buf, sizeof(buf), "port%u", port_id);
  1704	
  1705		return buf;
  1706	}
  1707	

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