tree: https://github.com/weiny2/linux-kernel.git tip-pks-v4.10-5.12-rc head: 74e4f6716199c0b1af6e647582a6b83c4a38cd2d commit: f69383c2f7dba762e982a795c9aeab99bc62ba99 [12/17] memremap: Add zone device access protection config: x86_64-randconfig-a004-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project fcc1ce00931751ac02498986feb37744e9ace8de) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/weiny2/linux-kernel/commit/f69383c2f7dba762e982a795c9a... git remote add weiny2 https://github.com/weiny2/linux-kernel.git git fetch --no-tags weiny2 tip-pks-v4.10-5.12-rc git checkout f69383c2f7dba762e982a795c9aeab99bc62ba99 # 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 >>): vim +123 mm/memremap.c 111 112 /** 113 * dev_access_protection_init: Configure a PKS key domain for device pages 114 * 115 * The domain defaults to the protected state. Device page mappings should set 116 * the PGMAP_PROT_ENABLED flag when mapping pages. 117 * 118 * Note the pkey is never free'ed. This is run at init time and we either get 119 * the key or we do not. We need to do this to maintian a constant key (or 120 * not) as device memory is added or removed. 121 */ 122 static int __init __dev_access_protection_init(void) 124 int pkey = pks_key_alloc("Device Memory"); 125 126 if (pkey < 0) 127 return 0; 128 129 dev_page_pkey = pkey; 130 131 return 0; 132 } 133 subsys_initcall(__dev_access_protection_init); 134 #else 135 static pgprot_t dev_pgprot_get(struct dev_pagemap *pgmap, pgprot_t prot) 136 { 137 return prot; 138 } 139 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org