[dwmw2:kexec-debug 14/19] arch/x86/kernel/early_printk.c:148:17: error: 'kexec_debug_8250_port' undeclared

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

tree:   git://git.infradead.org/users/dwmw2/linux kexec-debug
head:   f68307270bcdae9b9d59997d0712eedb41dcc2b1
commit: 5449b2a6c3c2fbf3a7e564111bf48ec73646b6ca [14/19] x86/kexec: Add 8250 serial port output
config: i386-randconfig-014-20250109 (https://download.01.org/0day-ci/archive/20250109/202501092339.M2pcVsb2-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/20250109/202501092339.M2pcVsb2-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/202501092339.M2pcVsb2-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/x86/kernel/early_printk.c: In function 'early_serial_hw_init':
>> arch/x86/kernel/early_printk.c:148:17: error: 'kexec_debug_8250_port' undeclared (first use in this function)
     148 |                 kexec_debug_8250_port = early_serial_base;
         |                 ^~~~~~~~~~~~~~~~~~~~~
   arch/x86/kernel/early_printk.c:148:17: note: each undeclared identifier is reported only once for each function it appears in


vim +/kexec_debug_8250_port +148 arch/x86/kernel/early_printk.c

   130	
   131	static __init void early_serial_hw_init(unsigned divisor)
   132	{
   133		unsigned char c;
   134	
   135		serial_out(early_serial_base, LCR, 0x3);	/* 8n1 */
   136		serial_out(early_serial_base, IER, 0);	/* no interrupt */
   137		serial_out(early_serial_base, FCR, 0);	/* no fifo */
   138		serial_out(early_serial_base, MCR, 0x3);	/* DTR + RTS */
   139	
   140		c = serial_in(early_serial_base, LCR);
   141		serial_out(early_serial_base, LCR, c | DLAB);
   142		serial_out(early_serial_base, DLL, divisor & 0xff);
   143		serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff);
   144		serial_out(early_serial_base, LCR, c & ~DLAB);
   145	
   146	#ifdef CONFIG_KEXEC_DEBUG
   147		if (serial_in == io_serial_in)
 > 148			kexec_debug_8250_port = early_serial_base;
   149	#endif
   150	}
   151	

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