Hi "Kirill, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on tip/x86/core] [also build test ERROR on v5.9] [cannot apply to kvm/linux-next hnaz-linux-mm/master next-20201016] [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] url: https://github.com/0day-ci/linux/commits/Kirill-A-Shutemov/KVM-protected-... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970 config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/1af02c27a796b91d58cd8b6d50d7e7b9b... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kirill-A-Shutemov/KVM-protected-memory-extension/20201020-142130 git checkout 1af02c27a796b91d58cd8b6d50d7e7b9b5564ce4 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): 11 | void *kvm_map_page_atomic(struct page *page) | ^~~~~~~~~~~~~~~~~~~ 24 | void kvm_unmap_page_atomic(void *vaddr) | ^~~~~~~~~~~~~~~~~~~~~ 33 | int kvm_init_protected_memory(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ 51 | void kvm_exit_protected_memory(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/mm.h:33, from include/linux/kvm_host.h:14, from virt/lib/mem_protected.c:1: virt/lib/mem_protected.c: In function 'adjust_direct_mapping_pte_range': 79 | ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \ | ^~~~~~~~~~~ virt/lib/mem_protected.c:79:8: note: in expansion of macro 'pte_offset_map' 79 | pte = pte_offset_map(pmd, addr); | ^~~~~~~~~~~~~~ virt/lib/mem_protected.c: At top level: virt/lib/mem_protected.c:102:5: warning: no previous prototype for '__kvm_protect_memory' [-Wmissing-prototypes] 102 | int __kvm_protect_memory(unsigned long start, unsigned long end, bool protect) | ^~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/kvm_map_page_atomic +11 virt/lib/mem_protected.c 10 12 { 13 pte_t *pte; 14 void *vaddr; 15 16 preempt_disable(); 17 pte = guest_map_ptes[smp_processor_id()]; 18 vaddr = guest_map_area->addr + smp_processor_id() * PAGE_SIZE; 19 set_pte(pte, mk_pte(page, PAGE_KERNEL)); 20 return vaddr; 21 } 22 EXPORT_SYMBOL_GPL(kvm_map_page_atomic); 23 25 { 26 pte_t *pte = guest_map_ptes[smp_processor_id()]; 27 set_pte(pte, __pte(0)); 28 flush_tlb_one_kernel((unsigned long)vaddr); 29 preempt_enable(); 30 } 31 EXPORT_SYMBOL_GPL(kvm_unmap_page_atomic); 32 34 { 35 guest_map_ptes = kmalloc_array(num_possible_cpus(), 36 sizeof(pte_t *), GFP_KERNEL); 37 if (!guest_map_ptes) 38 return -ENOMEM; 39 40 guest_map_area = alloc_vm_area(PAGE_SIZE * num_possible_cpus(), 41 guest_map_ptes); 42 if (!guest_map_ptes) { 43 kfree(guest_map_ptes); 44 return -ENOMEM; 45 } 46 47 return 0; 48 } 49 EXPORT_SYMBOL_GPL(kvm_init_protected_memory); 50 52 { 53 if (guest_map_area) 54 free_vm_area(guest_map_area); 55 if (guest_map_ptes) 56 kfree(guest_map_ptes); 57 } 58 EXPORT_SYMBOL_GPL(kvm_exit_protected_memory); 59 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org