drivers/tty/serial/8250/8250_keba.c:250:1: warning: the frame size of 1056 bytes is larger than 1024 bytes

drivers/tty/serial/8250/8250_keba.c:250:1: warning: the frame size of 1056 bytes is larger than 1024 bytes

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   165768bb70265b5c38cf0b73fafd75be235f8b14
commit: ab9a30d6febf768c057fcde74a46597862db443e serial: 8250: add driver for KEBA UART
date:   10 months ago
config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20260925/202609251951.KVWH0guw-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260925/202609251951.KVWH0guw-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
| Fixes: ab9a30d6febf ("serial: 8250: add driver for KEBA UART")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609251951.KVWH0guw-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/tty/serial/8250/8250_keba.c: In function 'kuart_probe':
>> drivers/tty/serial/8250/8250_keba.c:250:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=]
     250 | }
         | ^


vim +250 drivers/tty/serial/8250/8250_keba.c

   158	
   159	static int kuart_probe(struct auxiliary_device *auxdev,
   160			       const struct auxiliary_device_id *id)
   161	{
   162		struct device *dev = &auxdev->dev;
   163		struct uart_8250_port uart = {};
   164		struct resource res;
   165		struct kuart *kuart;
   166		int retval;
   167	
   168		kuart = devm_kzalloc(dev, sizeof(*kuart), GFP_KERNEL);
   169		if (!kuart)
   170			return -ENOMEM;
   171		kuart->auxdev = container_of(auxdev, struct keba_uart_auxdev, auxdev);
   172		kuart->flags = id->driver_data;
   173		auxiliary_set_drvdata(auxdev, kuart);
   174	
   175		/*
   176		 * map only memory in front of UART registers, UART registers will be
   177		 * mapped by serial port
   178		 */
   179		res = kuart->auxdev->io;
   180		res.end = res.start + KUART_BASE - 1;
   181		kuart->base = devm_ioremap_resource(dev, &res);
   182		if (IS_ERR(kuart->base))
   183			return PTR_ERR(kuart->base);
   184	
   185		if (kuart->flags & KUART_USE_CAPABILITY) {
   186			/*
   187			 * supported modes are read from capability register, at least
   188			 * one mode other than none must be supported
   189			 */
   190			kuart->capability = ioread8(kuart->base + KUART_CAPABILITY) &
   191					    KUART_CAPABILITY_MASK;
   192			if ((kuart->capability & ~KUART_CAPABILITY_NONE) == 0)
   193				return -EIO;
   194		}
   195	
   196		spin_lock_init(&uart.port.lock);
   197		uart.port.dev = dev;
   198		uart.port.mapbase = kuart->auxdev->io.start + KUART_BASE;
   199		uart.port.irq = kuart->auxdev->irq;
   200		uart.port.uartclk = KUART_CLK;
   201		uart.port.private_data = kuart;
   202	
   203		/* 8 bit registers are 32 bit aligned => shift register offset */
   204		uart.port.iotype = UPIO_MEM32;
   205		uart.port.regshift = KUART_REGSHIFT;
   206	
   207		/*
   208		 * UART mixes 16550, 16750 and 16C950 (for RS485) standard => auto
   209		 * configuration works best
   210		 */
   211		uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_IOREMAP;
   212	
   213		/*
   214		 * UART supports RS485, RS422 and RS232 with switching of physical
   215		 * interface
   216		 */
   217		uart.port.rs485_config = kuart_rs485_config;
   218		if (kuart->flags & KUART_RS485) {
   219			uart.port.rs485_supported.flags = SER_RS485_ENABLED |
   220							  SER_RS485_RTS_ON_SEND;
   221			uart.port.rs485.flags = SER_RS485_ENABLED |
   222						SER_RS485_RTS_ON_SEND;
   223		}
   224		if (kuart->flags & KUART_USE_CAPABILITY) {
   225			/* default mode priority is RS485 > RS422 > RS232 */
   226			if (kuart->capability & KUART_CAPABILITY_RS422) {
   227				uart.port.rs485_supported.flags |= SER_RS485_ENABLED |
   228								   SER_RS485_RTS_ON_SEND |
   229								   SER_RS485_MODE_RS422;
   230				uart.port.rs485.flags = SER_RS485_ENABLED |
   231							SER_RS485_RTS_ON_SEND |
   232							SER_RS485_MODE_RS422;
   233			}
   234			if (kuart->capability & KUART_CAPABILITY_RS485) {
   235				uart.port.rs485_supported.flags |= SER_RS485_ENABLED |
   236								   SER_RS485_RTS_ON_SEND;
   237				uart.port.rs485.flags = SER_RS485_ENABLED |
   238							SER_RS485_RTS_ON_SEND;
   239			}
   240		}
   241	
   242		retval = serial8250_register_8250_port(&uart);
   243		if (retval < 0) {
   244			dev_err(&auxdev->dev, "UART registration failed!\n");
   245			return retval;
   246		}
   247		kuart->line = retval;
   248	
   249		return 0;
 > 250	}
   251	

--
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https://github.com/intel/lkp-tests/wiki