linux-kernel - Re: [PATCH printk v3 2/7] printk: nbcon: Add acquire/release logic

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Message-ID: <202309040038.Cn1kd5bN-lkp@intel.com>
Date:   Mon, 4 Sep 2023 00:32:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>
Cc:     oe-kbuild-all@...ts.linux.dev,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH printk v3 2/7] printk: nbcon: Add acquire/release logic

Hi John,

kernel test robot noticed the following build warnings:

[auto build test WARNING on cb65d08d735e00cc55ad7700a82a453bb88c93a3]

url:    https://github.com/intel-lab-lkp/linux/commits/John-Ogness/printk-Add-non-BKL-nbcon-console-basic-infrastructure/20230903-230708
base:   cb65d08d735e00cc55ad7700a82a453bb88c93a3
patch link:    https://lore.kernel.org/r/20230903150539.245076-3-john.ogness%40linutronix.de
patch subject: [PATCH printk v3 2/7] printk: nbcon: Add acquire/release logic
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20230904/202309040038.Cn1kd5bN-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230904/202309040038.Cn1kd5bN-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309040038.Cn1kd5bN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/printk/nbcon.c:392: warning: expecting prototype for nbcon_context_try_acquire_hostile(). Prototype was for nbcon_context_acquire_hostile() instead


vim +392 kernel/printk/nbcon.c

   379	
   380	/**
   381	 * nbcon_context_try_acquire_hostile - Acquire via unsafe hostile takeover
   382	 * @ctxt:	The context of the caller
   383	 * @cur:	The current console state
   384	 *
   385	 * @cur is updated to the new console state.
   386	 *
   387	 * The general procedure is to set @prio (forcing ownership). This method
   388	 * must only be used as a final attempt during panic.
   389	 */
   390	static void nbcon_context_acquire_hostile(struct nbcon_context *ctxt,
   391						  struct nbcon_state *cur)
 > 392	{
   393		unsigned int cpu = smp_processor_id();
   394		struct console *con = ctxt->console;
   395		struct nbcon_state new;
   396	
   397		do {
   398			new.atom = cur->atom;
   399			new.cpu			= cpu;
   400			new.prio		= ctxt->prio;
   401			new.unsafe		|= cur->unsafe_takeover;
   402			new.unsafe_takeover	|= cur->unsafe;
   403	
   404		} while (!nbcon_state_try_cmpxchg(con, cur, &new));
   405	
   406		cur->atom = new.atom;
   407	}
   408	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki