[jirislaby:devel 67/107] drivers/tty/mxser.c:1401:5: warning: no previous prototype for function 'mxser_ioctl_op_mode'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel
head:   ab00d8ca266aab3b71f64266a2351dfce6baadfb
commit: 998695ea4c020601bfa37c3cb6559e48c420b286 [67/107] extract mxser_ioctl_op_mode
config: x86_64-randconfig-a006-20210318 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commit/?id=998695ea4c020601bfa37c3cb6559e48c420b286
        git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git
        git fetch --no-tags jirislaby devel
        git checkout 998695ea4c020601bfa37c3cb6559e48c420b286
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/tty/mxser.c:1401:5: warning: no previous prototype for function 'mxser_ioctl_op_mode' [-Wmissing-prototypes]
   int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
       ^
   drivers/tty/mxser.c:1401:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
   ^
   static 
   1 warning generated.


vim +/mxser_ioctl_op_mode +1401 drivers/tty/mxser.c

  1399	
  1400	/* We should likely switch to TIOCGRS485/TIOCSRS485. */
> 1401	int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
  1402			int __user *u_opmode)
  1403	{
  1404		static const unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
  1405		int opmode, p = index % 4;
  1406		int shiftbit = p * 2;
  1407		unsigned char val, mask;
  1408	
  1409		if (port->board->chip_flag != MOXA_MUST_MU860_HWID)
  1410			return -EFAULT;
  1411	
  1412		if (set) {
  1413			if (get_user(opmode, u_opmode))
  1414				return -EFAULT;
  1415	
  1416			if (opmode != RS232_MODE && opmode != RS485_2WIRE_MODE &&
  1417					opmode != RS422_MODE &&
  1418					opmode != RS485_4WIRE_MODE)
  1419				return -EFAULT;
  1420	
  1421			mask = ModeMask[p];
  1422	
  1423			spin_lock_irq(&port->slock);
  1424			val = inb(port->opmode_ioaddr);
  1425			val &= mask;
  1426			val |= (opmode << shiftbit);
  1427			outb(val, port->opmode_ioaddr);
  1428			spin_unlock_irq(&port->slock);
  1429		} else {
  1430			spin_lock_irq(&port->slock);
  1431			opmode = inb(port->opmode_ioaddr) >> shiftbit;
  1432			spin_unlock_irq(&port->slock);
  1433	
  1434			opmode &= OP_MODE_MASK;
  1435			if (put_user(opmode, u_opmode))
  1436				return -EFAULT;
  1437		}
  1438	
  1439		return 0;
  1440	}
  1441	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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