linux-kernel - Re: [PATCH 2/3] PCI/sysfs: Prohibit unaligned access to I/O port on non-x86

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Message-ID: <202512202328.VgDVWBKe-lkp@intel.com>
Date: Sun, 21 Dec 2025 00:20:22 +0800
From: kernel test robot <lkp@...el.com>
To: Ziming Du <duziming2@...wei.com>, bhelgaas@...gle.com
Cc: oe-kbuild-all@...ts.linux.dev, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, chrisw@...hat.com,
	jbarnes@...tuousgeek.org, alex.williamson@...hat.com,
	liuyongqiang13@...wei.com, duziming2@...wei.com
Subject: Re: [PATCH 2/3] PCI/sysfs: Prohibit unaligned access to I/O port on
 non-x86

Hi Ziming,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus linus/master v6.19-rc1 next-20251219]
[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/Ziming-Du/PCI-sysfs-fix-null-pointer-dereference-during-PCI-hotplug/20251216-163452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20251216083912.758219-3-duziming2%40huawei.com
patch subject: [PATCH 2/3] PCI/sysfs: Prohibit unaligned access to I/O port on non-x86
config: s390-randconfig-002-20251217 (https://download.01.org/0day-ci/archive/20251220/202512202328.VgDVWBKe-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251220/202512202328.VgDVWBKe-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/202512202328.VgDVWBKe-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/pci-sysfs.c:1145:13: warning: 'is_unaligned' defined but not used [-Wunused-function]
    static bool is_unaligned(unsigned long port, size_t size)
                ^~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_DEV
   Depends on [n]: NETDEVICES [=n] && CAN [=y]
   Selected by [y]:
   - CAN [=y] && NET [=y]


vim +/is_unaligned +1145 drivers/pci/pci-sysfs.c

  1143	
  1144	#if !defined(CONFIG_X86)
> 1145	static bool is_unaligned(unsigned long port, size_t size)
  1146	{
  1147		return port & (size - 1);
  1148	}
  1149	#endif
  1150	

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