linux-kernel - Re: [PATCH v8] panic: add panic_force_cpu= parameter to redirect panic to a specific CPU

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Message-ID: <202601231058.Q6hDGfoT-lkp@intel.com>
Date: Fri, 23 Jan 2026 10:11:33 +0800
From: kernel test robot <lkp@...el.com>
To: Pnina Feder <pnina.feder@...ileye.com>, akpm@...ux-foundation.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, pmladek@...e.com,
	bhe@...hat.com, linux-kernel@...r.kernel.org, lkp@...el.com,
	mgorman@...e.de, mingo@...hat.com, pnina.feder@...ileye.com,
	rostedt@...dmis.org, senozhatsky@...omium.org, tglx@...utronix.de,
	vkondra@...ileye.com
Subject: Re: [PATCH v8] panic: add panic_force_cpu= parameter to redirect
 panic to a specific CPU

Hi Pnina,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.19-rc6 next-20260122]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Pnina-Feder/panic-add-panic_force_cpu-parameter-to-redirect-panic-to-a-specific-CPU/20260122-182657
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260122102457.1154599-1-pnina.feder%40mobileye.com
patch subject: [PATCH v8] panic: add panic_force_cpu= parameter to redirect panic to a specific CPU
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260123/202601231058.Q6hDGfoT-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260123/202601231058.Q6hDGfoT-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/202601231058.Q6hDGfoT-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/panic.c:79:14: warning: unused variable 'panic_force_buf' [-Wunused-variable]
      79 | static char *panic_force_buf;
         |              ^~~~~~~~~~~~~~~
   1 warning generated.


vim +/panic_force_buf +79 kernel/panic.c

    77	
    78	static int panic_force_cpu = -1;
  > 79	static char *panic_force_buf;
    80	

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