linux-kernel - [rt-devel:linux-5.16.y-rt-rebase 16/132] kernel/printk/printk.c:2979:7: warning: variable 'any

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Date:   Sat, 22 Jan 2022 09:03:03 +0800
From:   kernel test robot <lkp@...el.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [rt-devel:linux-5.16.y-rt-rebase 16/132]
 kernel/printk/printk.c:2979:7: warning: variable 'any_usable' set but not
 used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.16.y-rt-rebase
head:   1722f531f5244c70dcd9687c40729860bb254e8d
commit: e1fd5438186d729df636919574f08231f7ecdd1d [16/132] serial: 8250: implement write_atomic
config: arm-randconfig-r016-20220121 (https://download.01.org/0day-ci/archive/20220122/202201220837.EAj9Nrqa-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=e1fd5438186d729df636919574f08231f7ecdd1d
        git remote add rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags rt-devel linux-5.16.y-rt-rebase
        git checkout e1fd5438186d729df636919574f08231f7ecdd1d
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/printk/

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 >>):

>> kernel/printk/printk.c:2979:7: warning: variable 'any_usable' set but not used [-Wunused-but-set-variable]
           bool any_usable = false;
                ^
   1 warning generated.


vim +/any_usable +2979 kernel/printk/printk.c

fe3d8ad31cf51b kernel/printk.c        Feng Tang   2011-03-22  2975  
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2976  #ifdef CONFIG_HAVE_ATOMIC_CONSOLE
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2977  static void atomic_console_flush_all(void)
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2978  {
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22 @2979  	bool any_usable = false;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2980  	unsigned long flags;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2981  	struct console *con;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2982  	bool any_progress;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2983  	int index = 0;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2984  
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2985  	if (console_suspended)
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2986  		return;
02489ebe320634 kernel/printk/printk.c John Ogness 2021-12-22  2987  

:::::: The code at line 2979 was first introduced by commit
:::::: 02489ebe320634155c5ddb3110d7d456fa68d304 printk: add infrastucture for atomic consoles

:::::: TO: John Ogness <john.ogness@...utronix.de>
:::::: CC: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

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