linux-kernel - Re: [PATCH v3 3/8] serial: core, 8250: set RS485 termination gpio in serial core

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Date:   Mon, 11 Jul 2022 00:07:51 +0800
From:   kernel test robot <lkp@...el.com>
To:     Lino Sanfilippo <LinoSanfilippo@....de>,
        gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        ilpo.jarvinen@...ux.intel.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        andriy.shevchenko@...ux.intel.com, vz@...ia.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        lukas@...ner.de, p.rosenberger@...bus.com,
        Lino Sanfilippo <l.sanfilippo@...bus.com>
Subject: Re: [PATCH v3 3/8] serial: core, 8250: set RS485 termination gpio in
 serial core

Hi Lino,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 7e5b4322cde067e1d0f1bf8f490e93f664a7c843]

url:    https://github.com/intel-lab-lkp/linux/commits/Lino-Sanfilippo/Fixes-and-cleanup-for-RS485/20220710-230624
base:   7e5b4322cde067e1d0f1bf8f490e93f664a7c843
config: hexagon-randconfig-r041-20220710 (https://download.01.org/0day-ci/archive/20220710/202207102355.Y27cvu6y-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6ce63e267aab79ca87bf63453d34dd3909ab978d)
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
        # https://github.com/intel-lab-lkp/linux/commit/846f02e6da9692810ed632dd72f45af667c3cc67
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Lino-Sanfilippo/Fixes-and-cleanup-for-RS485/20220710-230624
        git checkout 846f02e6da9692810ed632dd72f45af667c3cc67
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/tty/serial/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/tty/serial/serial_core.c:1364:6: warning: logical not is only applied to the left hand side of this bitwise operator [-Wlogical-not-parentheses]
           if (!rs485->flags & SER_RS485_ENABLED)
               ^             ~
   drivers/tty/serial/serial_core.c:1364:6: note: add parentheses after the '!' to evaluate the bitwise operator first
           if (!rs485->flags & SER_RS485_ENABLED)
               ^
                (                               )
   drivers/tty/serial/serial_core.c:1364:6: note: add parentheses around left hand side expression to silence this warning
           if (!rs485->flags & SER_RS485_ENABLED)
               ^
               (            )
   1 warning generated.


vim +1364 drivers/tty/serial/serial_core.c

  1360	
  1361	static void uart_set_rs485_termination(struct uart_port *port,
  1362					       const struct serial_rs485 *rs485)
  1363	{
> 1364		if (!rs485->flags & SER_RS485_ENABLED)
  1365			return;
  1366	
  1367		gpiod_set_value_cansleep(port->rs485_term_gpio,
  1368					 !!(rs485->flags & SER_RS485_TERMINATE_BUS));
  1369	}
  1370	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp