linux-kernel - Re: [PATCH next v1 1/2] dump_stack: move cpu lock to printk.c

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Message-ID: <202106010537.H7mZpVcu-lkp@intel.com>
Date:   Tue, 1 Jun 2021 05:49:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH next v1 1/2] dump_stack: move cpu lock to printk.c

Hi John,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20210528]

url:    https://github.com/0day-ci/linux/commits/John-Ogness/introduce-printk-cpu-lock/20210601-013122
base:    3e029760e6f8ce90c122c267a039ae73b3f1f5a4
config: x86_64-randconfig-a014-20210531 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project bc6799f2f79f0ae87e9f1ebf9d25ba799fbd25a9)
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://github.com/0day-ci/linux/commit/528abf3d0ab80471d02f4f16cbe97b2eaa918a11
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review John-Ogness/introduce-printk-cpu-lock/20210601-013122
        git checkout 528abf3d0ab80471d02f4f16cbe97b2eaa918a11
        # 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@...el.com>

All warnings (new ones prefixed by >>):

   lib/dump_stack.c:97: warning: Function parameter or member 'log_lvl' not described in 'dump_stack_lvl'
>> lib/dump_stack.c:97: warning: expecting prototype for dump_stack(). Prototype was for dump_stack_lvl() instead


vim +97 lib/dump_stack.c

^1da177e4c3f415 Linus Torvalds      2005-04-16   90  
196779b9b4ce192 Tejun Heo           2013-04-30   91  /**
196779b9b4ce192 Tejun Heo           2013-04-30   92   * dump_stack - dump the current task information and its stack trace
196779b9b4ce192 Tejun Heo           2013-04-30   93   *
196779b9b4ce192 Tejun Heo           2013-04-30   94   * Architectures can override this implementation by implementing its own.
196779b9b4ce192 Tejun Heo           2013-04-30   95   */
d542aa86de8ad0c Alexander Potapenko 2021-05-26   96  asmlinkage __visible void dump_stack_lvl(const char *log_lvl)
^1da177e4c3f415 Linus Torvalds      2005-04-16  @97  {
528abf3d0ab8047 John Ogness         2021-05-31   98  	unsigned int cpu_store;
d7ce36924344ace Eric Dumazet        2016-02-05   99  	unsigned long flags;
b58d977432c80ee Alex Thorlton       2013-07-03  100  
528abf3d0ab8047 John Ogness         2021-05-31  101  	printk_cpu_lock(&cpu_store, &flags);
d542aa86de8ad0c Alexander Potapenko 2021-05-26  102  	__dump_stack(log_lvl);
528abf3d0ab8047 John Ogness         2021-05-31  103  	printk_cpu_unlock(cpu_store, flags);
b58d977432c80ee Alex Thorlton       2013-07-03  104  }
d542aa86de8ad0c Alexander Potapenko 2021-05-26  105  EXPORT_SYMBOL(dump_stack_lvl);
d542aa86de8ad0c Alexander Potapenko 2021-05-26  106  

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

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