linux-kernel - Re: [PATCH v2 06/10] memory: scrub: Add scrub driver supports configuring memory scrubbers in the system

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Date:   Wed, 22 Nov 2023 09:59:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     shiju.jose@...wei.com, linux-cxl@...r.kernel.org,
        linux-mm@...ck.org, dave@...olabs.net, jonathan.cameron@...wei.com,
        dave.jiang@...el.com, alison.schofield@...el.com,
        vishal.l.verma@...el.com, ira.weiny@...el.com,
        dan.j.williams@...el.com
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        david@...hat.com, Vilas.Sridharan@....com, leo.duran@....com,
        Yazen.Ghannam@....com, rientjes@...gle.com, jiaqiyan@...gle.com,
        tony.luck@...el.com, Jon.Grimm@....com,
        dave.hansen@...ux.intel.com, rafael@...nel.org, lenb@...nel.org,
        naoya.horiguchi@....com, james.morse@....com,
        jthoughton@...gle.com, somasundaram.a@....com,
        erdemaktas@...gle.com, pgonda@...gle.com, duenwen@...gle.com,
        mike.malvestuto@...el.com
Subject: Re: [PATCH v2 06/10] memory: scrub: Add scrub driver supports
 configuring memory scrubbers in the system

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.7-rc2 next-20231121]
[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/shiju-jose-huawei-com/cxl-mbox-Add-GET_SUPPORTED_FEATURES-mailbox-command/20231121-182247
base:   linus/master
patch link:    https://lore.kernel.org/r/20231121101844.1161-7-shiju.jose%40huawei.com
patch subject: [PATCH v2 06/10] memory: scrub: Add scrub driver supports configuring memory scrubbers in the system
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231122/202311220944.tcffRUl0-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231122/202311220944.tcffRUl0-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/202311220944.tcffRUl0-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/memory/scrub/memory-scrub.c:71:48: warning: comparison of array 'scrub_dev->name' equal to a null pointer is always false [-Wtautological-pointer-compare]
           if (attr == &dev_attr_name.attr && scrub_dev->name == NULL)
                                              ~~~~~~~~~~~^~~~    ~~~~
   1 warning generated.


vim +71 drivers/memory/scrub/memory-scrub.c

    64	
    65	static umode_t scrub_dev_attr_is_visible(struct kobject *kobj,
    66						    struct attribute *attr, int n)
    67	{
    68		struct device *dev = kobj_to_dev(kobj);
    69		struct scrub_device *scrub_dev = to_scrub_device(dev);
    70	
  > 71		if (attr == &dev_attr_name.attr && scrub_dev->name == NULL)
    72			return 0;
    73	
    74		return attr->mode;
    75	}
    76	

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