tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/fpu-kvm head: dc3cd5721cdb0d3116a2feb84755427d1522477a commit: cdf2ff477461d9bfdeb7eac39d61ffbe1e323322 [69/88] x86/arch_prctl: Add controls for dynamic XSTATE components config: i386-randconfig-r032-20211017 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 746dd6a700931988dd9021d3d04718f1929885a5) 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/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel x86/fpu-kvm git checkout cdf2ff477461d9bfdeb7eac39d61ffbe1e323322 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the tglx-devel/x86/fpu-kvm HEAD dc3cd5721cdb0d3116a2feb84755427d1522477a builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): return xstate_request_perm(idx); ~~~~~~~~~~~~~~~~~~~ ^ arch/x86/kernel/fpu/xstate.c:1399:19: note: 'xstate_request_perm' declared here static inline int xstate_request_perm(u64 permitted, u64 requested) ^ 1 error generated. vim +1450 arch/x86/kernel/fpu/xstate.c 1404 1405 /** 1406 * fpu_xstate_prctl - xstate permission operations 1407 * @tsk: Redundant pointer to current 1408 * @option: A subfunction of arch_prctl() 1409 * @arg2: option argument 1410 * Return: 0 if successful; otherwise, an error code 1411 * 1412 * Option arguments: 1413 * 1414 * ARCH_GET_XCOMP_SUPP: Pointer to user space u64 to store the info 1415 * ARCH_GET_XCOMP_PERM: Pointer to user space u64 to store the info 1416 * ARCH_REQ_XCOMP_PERM: Facility number requested 1417 * 1418 * For facilities which require more than one XSTATE component, the request 1419 * must be the highest state component number related to that facility, 1420 * e.g. for AMX which requires XFEATURE_XTILE_CFG(17) and 1421 * XFEATURE_XTILE_DATA(18) this would be XFEATURE_XTILE_DATA(18). 1422 */ 1423 long fpu_xstate_prctl(struct task_struct *tsk, int option, unsigned long arg2) 1424 { 1425 u64 __user *uptr = (u64 __user *)arg2; 1426 u64 permitted, supported; 1427 unsigned long idx = arg2; 1428 1429 if (tsk != current) 1430 return -EPERM; 1431 1432 switch (option) { 1433 case ARCH_GET_XCOMP_SUPP: 1434 supported = fpu_user_cfg.max_features | fpu_user_cfg.legacy_features; 1435 return put_user(supported , uptr); 1436 1437 case ARCH_GET_XCOMP_PERM: 1438 /* 1439 * Lockless snapshot as it can also change right after the 1440 * dropping the lock. 1441 */ 1442 permitted = xstate_get_host_group_perm(); 1443 permitted &= XFEATURE_MASK_USER_SUPPORTED; 1444 return put_user(permitted, uptr); 1445 1446 case ARCH_REQ_XCOMP_PERM: 1447 if (!IS_ENABLED(CONFIG_X86_64)) 1448 return -ENOTSUPP; 1449 1451 1452 default: 1453 return -EINVAL; 1454 } 1455 } 1456 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org