linux-kernel - Re: [PATCH] tick/nohz: avoid showing '(null)' if nohz

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Message-ID: <202510100304.IpfE7EKh-lkp@intel.com>
Date: Fri, 10 Oct 2025 03:40:28 +0800
From: kernel test robot <lkp@...el.com>
To: Aaron Tomlin <atomlin@...mlin.com>, gregkh@...uxfoundation.org,
	rafael@...nel.org, dakr@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, riel@...riel.com,
	frederic@...nel.org, atomlin@...mlin.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tick/nohz: avoid showing '(null)' if nohz_full= not set

Hi Aaron,

kernel test robot noticed the following build warnings:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.17 next-20251009]
[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/Aaron-Tomlin/tick-nohz-avoid-showing-null-if-nohz_full-not-set/20251009-142404
base:   driver-core/driver-core-testing
patch link:    https://lore.kernel.org/r/20251006005824.76187-1-atomlin%40atomlin.com
patch subject: [PATCH] tick/nohz: avoid showing '(null)' if nohz_full= not set
config: x86_64-randconfig-078-20251009 (https://download.01.org/0day-ci/archive/20251010/202510100304.IpfE7EKh-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251010/202510100304.IpfE7EKh-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/202510100304.IpfE7EKh-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/base/cpu.c:307:10: warning: address of array 'tick_nohz_full_mask' will always evaluate to 'true' [-Wpointer-bool-conversion]
     307 |         return !tick_nohz_full_mask ?
         |                ~^~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +307 drivers/base/cpu.c

   302	
   303	#ifdef CONFIG_NO_HZ_FULL
   304	static ssize_t print_cpus_nohz_full(struct device *dev,
   305					    struct device_attribute *attr, char *buf)
   306	{
 > 307		return !tick_nohz_full_mask ?
   308			sysfs_emit(buf, "\n") :
   309			sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask));
   310	}
   311	static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL);
   312	#endif
   313	

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