linux-kernel - Re: [PATCH] clocksource/drivers: remove unnecessary return in switch statement

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Date:   Tue, 26 Apr 2022 02:05:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     cgel.zte@...il.com, daniel@...ngy.jp
Cc:     kbuild-all@...ts.01.org, romain.perier@...il.com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] clocksource/drivers: remove unnecessary return in switch
 statement

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/timers/core]
[also build test WARNING on v5.18-rc4 next-20220422]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/cgel-zte-gmail-com/clocksource-drivers-remove-unnecessary-return-in-switch-statement/20220425-170540
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git ce8abf340e40e1126bfcb9e7679b3d6b524ae3e0
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220426/202204260158.ccGqDClt-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/f185e49aea517bee5dfb706df47fa5f70bfac370
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review cgel-zte-gmail-com/clocksource-drivers-remove-unnecessary-return-in-switch-statement/20220425-170540
        git checkout f185e49aea517bee5dfb706df47fa5f70bfac370
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash drivers/clocksource/

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

All warnings (new ones prefixed by >>):

   drivers/clocksource/timer-msc313e.c: In function 'msc313e_timer_init':
>> drivers/clocksource/timer-msc313e.c:230:13: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     230 |         int ret = 0;
         |             ^~~


vim +/ret +230 drivers/clocksource/timer-msc313e.c

5fc1f93f69989e Romain Perier 2021-12-17  227  
5fc1f93f69989e Romain Perier 2021-12-17  228  static int __init msc313e_timer_init(struct device_node *np)
5fc1f93f69989e Romain Perier 2021-12-17  229  {
5fc1f93f69989e Romain Perier 2021-12-17 @230  	int ret = 0;
5fc1f93f69989e Romain Perier 2021-12-17  231  	static int num_called;
5fc1f93f69989e Romain Perier 2021-12-17  232  
5fc1f93f69989e Romain Perier 2021-12-17  233  	switch (num_called) {
5fc1f93f69989e Romain Perier 2021-12-17  234  	case 0:
5fc1f93f69989e Romain Perier 2021-12-17  235  		ret = msc313e_clksrc_init(np);
5fc1f93f69989e Romain Perier 2021-12-17  236  		break;
5fc1f93f69989e Romain Perier 2021-12-17  237  
5fc1f93f69989e Romain Perier 2021-12-17  238  	default:
5fc1f93f69989e Romain Perier 2021-12-17  239  		ret = msc313e_clkevt_init(np);
5fc1f93f69989e Romain Perier 2021-12-17  240  		break;
5fc1f93f69989e Romain Perier 2021-12-17  241  	}
5fc1f93f69989e Romain Perier 2021-12-17  242  
5fc1f93f69989e Romain Perier 2021-12-17  243  	num_called++;
5fc1f93f69989e Romain Perier 2021-12-17  244  
5fc1f93f69989e Romain Perier 2021-12-17  245  	return 0;
5fc1f93f69989e Romain Perier 2021-12-17  246  }
5fc1f93f69989e Romain Perier 2021-12-17  247  

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