Re: [PATCH] serial: amba-pl011: Implement nbcon console

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

Hi Toshiyuki,

kernel test robot noticed the following build errors:

[auto build test ERROR on tty/tty-linus]
[also build test ERROR on usb/usb-testing usb/usb-next usb/usb-linus linus/master v6.13-rc6]
[cannot apply to tty/tty-testing tty/tty-next next-20250109]
[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/Toshiyuki-Sato/serial-amba-pl011-Implement-nbcon-console/20250108-085122
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-linus
patch link:    https://lore.kernel.org/r/20250108004730.2302996-1-fj6611ie%40aa.jp.fujitsu.com
patch subject: [PATCH] serial: amba-pl011: Implement nbcon console
config: arm64-randconfig-002-20250109 (https://download.01.org/0day-ci/archive/20250109/202501092316.bZPuAcFC-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project f5cd181ffbb7cb61d582fe130d46580d5969d47a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250109/202501092316.bZPuAcFC-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/202501092316.bZPuAcFC-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/tty/serial/amba-pl011.c:30:
   In file included from include/linux/amba/bus.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:21:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   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_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/tty/serial/amba-pl011.c:2851:4: error: call to undeclared function 'pl011_console_switch_to_nbcon'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2851 |                         pl011_console_switch_to_nbcon(amba_reg.cons);
         |                         ^
   3 warnings and 1 error generated.


vim +/pl011_console_switch_to_nbcon +2851 drivers/tty/serial/amba-pl011.c

  2839	
  2840	static int pl011_register_port(struct uart_amba_port *uap)
  2841	{
  2842		int ret, i;
  2843	
  2844		/* Ensure interrupts from this UART are masked and cleared */
  2845		pl011_write(0, uap, REG_IMSC);
  2846		pl011_write(0xffff, uap, REG_ICR);
  2847	
  2848		if (!amba_reg.state) {
  2849			/* Replaces the console descriptor if NBCON is selected. */
  2850			if (amba_reg.cons && use_nbcon)
> 2851				pl011_console_switch_to_nbcon(amba_reg.cons);
  2852	
  2853			ret = uart_register_driver(&amba_reg);
  2854			if (ret < 0) {
  2855				dev_err(uap->port.dev,
  2856					"Failed to register AMBA-PL011 driver\n");
  2857				for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
  2858					if (amba_ports[i] == uap)
  2859						amba_ports[i] = NULL;
  2860				return ret;
  2861			}
  2862		}
  2863	
  2864		ret = uart_add_one_port(&amba_reg, &uap->port);
  2865		if (ret)
  2866			pl011_unregister_port(uap);
  2867	
  2868		return ret;
  2869	}
  2870	

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