Hi Jing,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on d0732b0f8884d9cc0eca0082bbaef043f3fef7fb]

url:    https://github.com/0day-ci/linux/commits/Jing-Zhang/KVM-stats-Add-VM-dirty_pages-stats-for-the-number-of-dirty-pages/20210811-063544
base:   d0732b0f8884d9cc0eca0082bbaef043f3fef7fb
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc-linux-gcc (GCC) 10.3.0
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://github.com/0day-ci/linux/commit/85679ee0cff16eaae940baba21e08ad6e9944698
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jing-Zhang/KVM-stats-Add-VM-dirty_pages-stats-for-the-number-of-dirty-pages/20210811-063544
        git checkout 85679ee0cff16eaae940baba21e08ad6e9944698
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arch/powerpc/kvm/book3s_hv_rm_mmu.c: In function 'kvmppc_update_dirty_map':
>> arch/powerpc/kvm/book3s_hv_rm_mmu.c:112:2: error: 'kvm' undeclared (first use in this function)
     112 |  kvm->stat.generic.dirty_pages += npages;
         |  ^~~
   arch/powerpc/kvm/book3s_hv_rm_mmu.c:112:2: note: each undeclared identifier is reported only once for each function it appears in


vim +/kvm +112 arch/powerpc/kvm/book3s_hv_rm_mmu.c

   100	
   101	/* Update the dirty bitmap of a memslot */
   102	void kvmppc_update_dirty_map(const struct kvm_memory_slot *memslot,
   103				     unsigned long gfn, unsigned long psize)
   104	{
   105		unsigned long npages;
   106	
   107		if (!psize || !memslot->dirty_bitmap)
   108			return;
   109		npages = (psize + PAGE_SIZE - 1) / PAGE_SIZE;
   110		gfn -= memslot->base_gfn;
   111		set_dirty_bits_atomic(memslot->dirty_bitmap, gfn, npages);
 > 112		kvm->stat.generic.dirty_pages += npages;
   113	}
   114	EXPORT_SYMBOL_GPL(kvmppc_update_dirty_map);
   115	

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