[dwmw2:kexec-debug-6 5/7] arch/x86/kernel/early_printk.c:148:3: error: use of undeclared identifier 'kexec_debug_8250_port'

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

tree:   git://git.infradead.org/users/dwmw2/linux kexec-debug-6
head:   145ae55a8834381a4011861d8607cb4c0f9cf88e
commit: 3d8ea5d45b0a2079e58cd0c72e0a1ac28fd431ca [5/7] x86/kexec: Add 8250 serial port output
config: x86_64-randconfig-076-20250124 (https://download.01.org/0day-ci/archive/20250125/202501250944.JEBhawoz-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250125/202501250944.JEBhawoz-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/202501250944.JEBhawoz-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/early_printk.c:4:
   In file included from include/linux/kexec.h:18:
   In file included from include/linux/vmcore_info.h:6:
   In file included from include/linux/elfcore.h:11:
   In file included from include/linux/ptrace.h:10:
   In file included from include/linux/pid_namespace.h:7:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> arch/x86/kernel/early_printk.c:148:3: error: use of undeclared identifier 'kexec_debug_8250_port'
     148 |                 kexec_debug_8250_port = early_serial_base;
         |                 ^
   1 warning and 1 error generated.


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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