Hi Stephen,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   315d99318179b9cd5077ccc9f7f26a164c9fa998
commit: 3b7e56be786462423802ff84525b9a12539c5887 Merge branch 'kvm-arm64/nvhe-sve' into kvmarm-master/next
date:   4 weeks ago
config: arm64-randconfig-s032-20210513 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3b7e56be786462423802ff84525b9a12539c5887
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 3b7e56be786462423802ff84525b9a12539c5887
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> arch/arm64/kvm/hyp/nvhe/mem_protect.c:26:17: sparse: sparse: symbol 'host_s2_mem' was not declared. Should it be static?
>> arch/arm64/kvm/hyp/nvhe/mem_protect.c:27:17: sparse: sparse: symbol 'host_s2_dev' was not declared. Should it be static?

vim +/host_s2_mem +26 arch/arm64/kvm/hyp/nvhe/mem_protect.c

1025c8c0c6accf Quentin Perret 2021-03-19  25  
1025c8c0c6accf Quentin Perret 2021-03-19 @26  struct hyp_pool host_s2_mem;
1025c8c0c6accf Quentin Perret 2021-03-19 @27  struct hyp_pool host_s2_dev;
1025c8c0c6accf Quentin Perret 2021-03-19  28  

:::::: The code at line 26 was first introduced by commit
:::::: 1025c8c0c6accfcbdc8f52ca1940160f65cd87d6 KVM: arm64: Wrap the host with a stage 2

:::::: TO: Quentin Perret <qperret@google.com>
:::::: CC: Marc Zyngier <maz@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org