tree: https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git pending head: fa809cc6feedcd2575b63def7135dfaf066266bb commit: fc6fd550b9f1ada1bdb5e12f83e3794e81a2eb42 [31/38] cxl/mbox: Add exclusive kernel command support config: x86_64-randconfig-a015-20210814 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=fc... git remote add cxl-cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git git fetch --no-tags cxl-cxl pending git checkout fc6fd550b9f1ada1bdb5e12f83e3794e81a2eb42 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (!cxl_nvb->nvdimm_bus) ^~~~~~~~~~~~~~~~~~~~ drivers/cxl/pmem.c:80:7: note: uninitialized use occurs here if (!nvdimm && rc == 0) ^~~~~~ drivers/cxl/pmem.c:66:2: note: remove the 'if' if its condition is always false if (!cxl_nvb->nvdimm_bus) ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/cxl/pmem.c:58:23: note: initialize the variable 'nvdimm' to silence this warning struct nvdimm *nvdimm; ^ = NULL 1 warning generated. vim +66 drivers/cxl/pmem.c 21083f51521fb0 Dan Williams 2021-06-15 50 21083f51521fb0 Dan Williams 2021-06-15 51 static int cxl_nvdimm_probe(struct device *dev) 21083f51521fb0 Dan Williams 2021-06-15 52 { 21083f51521fb0 Dan Williams 2021-06-15 53 struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev); fc6fd550b9f1ad Dan Williams 2021-06-17 54 struct cxl_memdev *cxlmd = cxl_nvd->cxlmd; fc6fd550b9f1ad Dan Williams 2021-06-17 55 struct cxl_mem *cxlm = cxlmd->cxlm; 21083f51521fb0 Dan Williams 2021-06-15 56 struct cxl_nvdimm_bridge *cxl_nvb; 21083f51521fb0 Dan Williams 2021-06-15 57 unsigned long flags = 0; 21083f51521fb0 Dan Williams 2021-06-15 58 struct nvdimm *nvdimm; 21083f51521fb0 Dan Williams 2021-06-15 59 int rc = -ENXIO; 21083f51521fb0 Dan Williams 2021-06-15 60 21083f51521fb0 Dan Williams 2021-06-15 61 cxl_nvb = cxl_find_nvdimm_bridge(); 21083f51521fb0 Dan Williams 2021-06-15 62 if (!cxl_nvb) 21083f51521fb0 Dan Williams 2021-06-15 63 return -ENXIO; 21083f51521fb0 Dan Williams 2021-06-15 64 21083f51521fb0 Dan Williams 2021-06-15 65 device_lock(&cxl_nvb->dev); 21083f51521fb0 Dan Williams 2021-06-15 @66 if (!cxl_nvb->nvdimm_bus) 21083f51521fb0 Dan Williams 2021-06-15 67 goto out; 21083f51521fb0 Dan Williams 2021-06-15 68 fc6fd550b9f1ad Dan Williams 2021-06-17 69 set_exclusive_cxl_commands(cxlm, exclusive_cmds); fc6fd550b9f1ad Dan Williams 2021-06-17 70 21083f51521fb0 Dan Williams 2021-06-15 71 set_bit(NDD_LABELING, &flags); 21083f51521fb0 Dan Williams 2021-06-15 72 nvdimm = nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags, 0, 0, 21083f51521fb0 Dan Williams 2021-06-15 73 NULL); fc6fd550b9f1ad Dan Williams 2021-06-17 74 dev_set_drvdata(dev, nvdimm); fc6fd550b9f1ad Dan Williams 2021-06-17 75 rc = devm_add_action_or_reset(dev, unregister_nvdimm, cxl_nvd); 21083f51521fb0 Dan Williams 2021-06-15 76 out: 21083f51521fb0 Dan Williams 2021-06-15 77 device_unlock(&cxl_nvb->dev); 21083f51521fb0 Dan Williams 2021-06-15 78 put_device(&cxl_nvb->dev); 21083f51521fb0 Dan Williams 2021-06-15 79 fc6fd550b9f1ad Dan Williams 2021-06-17 80 if (!nvdimm && rc == 0) fc6fd550b9f1ad Dan Williams 2021-06-17 81 rc = -ENOMEM; fc6fd550b9f1ad Dan Williams 2021-06-17 82 21083f51521fb0 Dan Williams 2021-06-15 83 return rc; 21083f51521fb0 Dan Williams 2021-06-15 84 } 21083f51521fb0 Dan Williams 2021-06-15 85 :::::: The code at line 66 was first introduced by commit :::::: 21083f51521fb0f60dbac591f175c3ed48435af4 cxl/pmem: Register 'pmem' / cxl_nvdimm devices :::::: TO: Dan Williams <dan.j.williams(a)intel.com&gt; :::::: CC: Dan Williams <dan.j.williams(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org