[kbuild-all] arch/arm/kvm/../../../virt/kvm/kvm_main.c:633:12: warning: no previous prototype for 'kvm_arch_post_init_vm'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1df0d8960499e58963fd6c8ac75e544f2b417b29 commit: 1aa9b9572b10529c2e64e2b8f44025d86e124308 kvm: x86: mmu: Recovery of shattered NX large pages date: 8 months ago config: arm-axm55xx_defconfig (attached as .config) compiler: arm-linux-gnueabi-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 git checkout 1aa9b9572b10529c2e64e2b8f44025d86e124308 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): 633 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | ^~~~~~~~~~~~~~~~~~~~~ 642 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/kvm_arch_post_init_vm +633 arch/arm/kvm/../../../virt/kvm/kvm_main.c 628 629 /* 630 * Called after the VM is otherwise initialized, but just before adding it to 631 * the vm_list. 632 */ 634 { 635 return 0; 636 } 637 638 /* 639 * Called just after removing the VM from the vm_list, but before doing any 640 * other destruction. 641 */ 643 { 644 } 645 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org