[arm-platforms:kvm-arm64/vhe-wsinc 27/31] arch/arm/kvm/mmu.c:597:2: error: implicit declaration of function 'is_kernel_in_hyp_mode'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe-wsinc
head:   de3f90e8d3e0751d8bfb2ed946eb4fdbf880d549
commit: 6df2cc7cc0972deb9f639ab14a68c11f0a55e2e7 [27/31] arm64: KVM: skip HYP setup when already running in HYP
config: arm-axm55xx_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6df2cc7cc0972deb9f639ab14a68c11f0a55e2e7
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   arch/arm/kvm/mmu.c: In function 'create_hyp_mappings':
>> arch/arm/kvm/mmu.c:597:2: error: implicit declaration of function 'is_kernel_in_hyp_mode' [-Werror=implicit-function-declaration]
     if (is_kernel_in_hyp_mode())
     ^
   cc1: some warnings being treated as errors

vim +/is_kernel_in_hyp_mode +597 arch/arm/kvm/mmu.c

   591	{
   592		phys_addr_t phys_addr;
   593		unsigned long virt_addr;
   594		unsigned long start = KERN_TO_HYP((unsigned long)from);
   595		unsigned long end = KERN_TO_HYP((unsigned long)to);
   596	
 > 597		if (is_kernel_in_hyp_mode())
   598			return 0;
   599	
   600		start = start & PAGE_MASK;

---
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