Re: [PATCH 1/2] tty: serial: 8250: Fix MOXA RS422/RS485 PCIe boards not work by default

[kernel test robot]

Hi Crescent,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tty/tty-testing]
[also build test WARNING on tty/tty-next next-20231027]
[cannot apply to tty/tty-linus usb/usb-testing usb/usb-next usb/usb-linus linus/master v6.6-rc7]
[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/Crescent-CY-Hsieh/tty-serial-8250-Fix-MOXA-RS422-RS485-PCIe-boards-not-work-by-default/20231027-142745
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
patch link:    https://lore.kernel.org/r/20231027062440.7749-2-crescentcy.hsieh%40moxa.com
patch subject: [PATCH 1/2] tty: serial: 8250: Fix MOXA RS422/RS485 PCIe boards not work by default
config: i386-randconfig-002-20231028 (https://download.01.org/0day-ci/archive/20231028/202310281723.0DAslF1o-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231028/202310281723.0DAslF1o-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310281723.0DAslF1o-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/tty/serial/8250/8250_pci.c:2001:5: warning: no previous declaration for 'pci_moxa_supported_rs' [-Wmissing-declarations]
    u32 pci_moxa_supported_rs(struct pci_dev *dev)
        ^~~~~~~~~~~~~~~~~~~~~


vim +/pci_moxa_supported_rs +2001 drivers/tty/serial/8250/8250_pci.c

  2000	
> 2001	u32 pci_moxa_supported_rs(struct pci_dev *dev)
  2002	{
  2003		switch (dev->device & 0x0F00) {
  2004		case 0x0000:
  2005		case 0x0600:
  2006			return MOXA_SUPP_RS232;
  2007		case 0x0100:
  2008			return MOXA_SUPP_RS232 | MOXA_SUPP_RS422 | MOXA_SUPP_RS485;
  2009		case 0x0300:
  2010			return MOXA_SUPP_RS422 | MOXA_SUPP_RS485;
  2011		}
  2012		return 0;
  2013	}
  2014	

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