[driver-core:tty-test 13/13] drivers/tty/tty_baudrate.c:92:9: warning: no previous prototype for function 'tty_termios_input_baud_rate'

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

[-- Attachment #1: Type: text/plain, Size: 5243 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git tty-test
head:   8a67b4c2f3f14e73a8ddfbef9c032d9f2fa6979a
commit: 8a67b4c2f3f14e73a8ddfbef9c032d9f2fa6979a [13/13] tty: clean include/linux/tty.h up
config: x86_64-randconfig-r013-20210408 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 56ea2e2fdd691136d5e6631fa0e447173694b82c)
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/gregkh/driver-core.git/commit/?id=8a67b4c2f3f14e73a8ddfbef9c032d9f2fa6979a
        git remote add driver-core https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
        git fetch --no-tags driver-core tty-test
        git checkout 8a67b4c2f3f14e73a8ddfbef9c032d9f2fa6979a
        # 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/tty_baudrate.c:92:9: warning: no previous prototype for function 'tty_termios_input_baud_rate' [-Wmissing-prototypes]
   speed_t tty_termios_input_baud_rate(struct ktermios *termios)
           ^
   drivers/tty/tty_baudrate.c:92:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   speed_t tty_termios_input_baud_rate(struct ktermios *termios)
   ^
   static 
   1 warning generated.


vim +/tty_termios_input_baud_rate +92 drivers/tty/tty_baudrate.c

fff0a2ca3a061c Nicolas Pitre  2017-04-12   79  
fff0a2ca3a061c Nicolas Pitre  2017-04-12   80  /**
fff0a2ca3a061c Nicolas Pitre  2017-04-12   81   *	tty_termios_input_baud_rate
fff0a2ca3a061c Nicolas Pitre  2017-04-12   82   *	@termios: termios structure
fff0a2ca3a061c Nicolas Pitre  2017-04-12   83   *
fff0a2ca3a061c Nicolas Pitre  2017-04-12   84   *	Convert termios baud rate data into a speed. This should be called
fff0a2ca3a061c Nicolas Pitre  2017-04-12   85   *	with the termios lock held if this termios is a terminal termios
fff0a2ca3a061c Nicolas Pitre  2017-04-12   86   *	structure. May change the termios data. Device drivers can call this
fff0a2ca3a061c Nicolas Pitre  2017-04-12   87   *	function but should use ->c_[io]speed directly as they are updated.
fff0a2ca3a061c Nicolas Pitre  2017-04-12   88   *
fff0a2ca3a061c Nicolas Pitre  2017-04-12   89   *	Locking: none
fff0a2ca3a061c Nicolas Pitre  2017-04-12   90   */
fff0a2ca3a061c Nicolas Pitre  2017-04-12   91  
fff0a2ca3a061c Nicolas Pitre  2017-04-12  @92  speed_t tty_termios_input_baud_rate(struct ktermios *termios)
fff0a2ca3a061c Nicolas Pitre  2017-04-12   93  {
fff0a2ca3a061c Nicolas Pitre  2017-04-12   94  #ifdef IBSHIFT
fff0a2ca3a061c Nicolas Pitre  2017-04-12   95  	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
fff0a2ca3a061c Nicolas Pitre  2017-04-12   96  
fff0a2ca3a061c Nicolas Pitre  2017-04-12   97  	if (cbaud == B0)
fff0a2ca3a061c Nicolas Pitre  2017-04-12   98  		return tty_termios_baud_rate(termios);
fefe287e4bf6ee Johan Hovold   2018-07-15   99  #ifdef BOTHER
fff0a2ca3a061c Nicolas Pitre  2017-04-12  100  	/* Magic token for arbitrary speed via c_ispeed*/
fff0a2ca3a061c Nicolas Pitre  2017-04-12  101  	if (cbaud == BOTHER)
fff0a2ca3a061c Nicolas Pitre  2017-04-12  102  		return termios->c_ispeed;
fefe287e4bf6ee Johan Hovold   2018-07-15  103  #endif
fff0a2ca3a061c Nicolas Pitre  2017-04-12  104  	if (cbaud & CBAUDEX) {
fff0a2ca3a061c Nicolas Pitre  2017-04-12  105  		cbaud &= ~CBAUDEX;
fff0a2ca3a061c Nicolas Pitre  2017-04-12  106  
fff0a2ca3a061c Nicolas Pitre  2017-04-12  107  		if (cbaud < 1 || cbaud + 15 > n_baud_table)
fff0a2ca3a061c Nicolas Pitre  2017-04-12  108  			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
fff0a2ca3a061c Nicolas Pitre  2017-04-12  109  		else
fff0a2ca3a061c Nicolas Pitre  2017-04-12  110  			cbaud += 15;
fff0a2ca3a061c Nicolas Pitre  2017-04-12  111  	}
991a2519409700 H. Peter Anvin 2018-10-22  112  	return cbaud >= n_baud_table ? 0 : baud_table[cbaud];
fefe287e4bf6ee Johan Hovold   2018-07-15  113  #else	/* IBSHIFT */
fff0a2ca3a061c Nicolas Pitre  2017-04-12  114  	return tty_termios_baud_rate(termios);
fefe287e4bf6ee Johan Hovold   2018-07-15  115  #endif	/* IBSHIFT */
fff0a2ca3a061c Nicolas Pitre  2017-04-12  116  }
fff0a2ca3a061c Nicolas Pitre  2017-04-12  117  EXPORT_SYMBOL(tty_termios_input_baud_rate);
fff0a2ca3a061c Nicolas Pitre  2017-04-12  118  

:::::: The code at line 92 was first introduced by commit
:::::: fff0a2ca3a061c230b0e905e7586267a517538ac tty: move baudrate handling code to a file of its own

:::::: TO: Nicolas Pitre <nicolas.pitre@linaro.org>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 36023 bytes --]