drivers/tty/serial/ucc_uart.c:286:6: warning: no previous prototype for 'qe_uart_set_mctrl'

[kernel test robot]

Hi Rasmus,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   07a56bb875afbe39dabbf6ba7b83783d166863db
commit: 5a35435ef4e6e4bd2aabd6706b146b298a9cffe5 soc: fsl: qe: remove PPC32 dependency from CONFIG_QUICC_ENGINE
date:   7 months ago
config: c6x-randconfig-r011-20200717 (attached as .config)
compiler: c6x-elf-gcc (GCC) 9.3.0
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
        git checkout 5a35435ef4e6e4bd2aabd6706b146b298a9cffe5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=c6x 

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

All warnings (new ones prefixed by >>):

>> drivers/tty/serial/ucc_uart.c:286:6: warning: no previous prototype for 'qe_uart_set_mctrl' [-Wmissing-prototypes]
     286 | void qe_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
         |      ^~~~~~~~~~~~~~~~~

vim +/qe_uart_set_mctrl +286 drivers/tty/serial/ucc_uart.c

d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  278  
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  279  /*
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  280   * Set the modem control lines
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  281   *
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  282   * Although the QE can control the modem control lines (e.g. CTS), we
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  283   * don't need that support. This function must exist, however, otherwise
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  284   * the kernel will panic.
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  285   */
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15 @286  void qe_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  287  {
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  288  }
d7584ed2b994a5 drivers/serial/ucc_uart.c Timur Tabi 2008-01-15  289  

:::::: The code at line 286 was first introduced by commit
:::::: d7584ed2b994a572326650b0c4d2c25961e6f49d [POWERPC] qe-uart: add support for Freescale QUICCEngine UART

:::::: TO: Timur Tabi <timur@xxxxxxxxxxxxx>
:::::: CC: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>

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

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