[kbuild-all] [linux-next:master 5240/5787] drivers/iommu/intel/pasid.c:536:22: error: implicit declaration of function 'read_cr0'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f00397ee41c79b6155b9b44abd0055b2c0621349 commit: f68c7f539b6e9712e941212ab95a1feb5a0bf3b3 [5240/5787] iommu/vt-d: Enable write protect for supervisor SVM config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 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/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout f68c7f539b6e9712e941212ab95a1feb5a0bf3b3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/iommu/intel/pasid.c: In function 'pasid_enable_wpe': 536 | unsigned long cr0 = read_cr0(); | ^~~~~~~~ In file included from include/linux/build_bug.h:5, from include/linux/bits.h:22, from include/linux/bitops.h:6, from drivers/iommu/intel/pasid.c:12: 539 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ drivers/iommu/intel/pasid.c:539:23: note: each undeclared identifier is reported only once for each function it appears in 539 | if (unlikely(!(cr0 & X86_CR0_WP))) { | ^~~~~~~~~~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ cc1: some warnings being treated as errors Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for FRAME_POINTER Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS Selected by - FAULT_INJECTION_STACKTRACE_FILTER && FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT && !X86_64 && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 vim +/read_cr0 +536 drivers/iommu/intel/pasid.c 533 534 static inline int pasid_enable_wpe(struct pasid_entry *pte) 535 { 537 538 /* CR0.WP is normally set but just to be sure */ 540 pr_err_ratelimited("No CPU write protect!\n"); 541 return -EINVAL; 542 } 543 pasid_set_wpe(pte); 544 545 return 0; 546 }; 547 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org