tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm64-ro-page-tables-pkvm
head:   147019c64ba96b2f39f3e952d2833db8a3f6395b
commit: 266772be0e13ff4b230105c58f217481d9c23d43 [10/35] KVM: arm64: Introduce an early Hyp page allocator
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=266772be0e13ff4b230105c58f217481d9c23d43
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb arm64-ro-page-tables-pkvm
        git checkout 266772be0e13ff4b230105c58f217481d9c23d43
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/early_alloc.c:18:15: warning: no previous prototype for 'hyp_early_alloc_nr_pages' [-Wmissing-prototypes]
      18 | unsigned long hyp_early_alloc_nr_pages(void)
         |               ^~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kvm/hyp/nvhe/early_alloc.c:25:7: warning: no previous prototype for 'hyp_early_alloc_contig' [-Wmissing-prototypes]
      25 | void *hyp_early_alloc_contig(unsigned int nr_pages)
         |       ^~~~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kvm/hyp/nvhe/early_alloc.c:46:7: warning: no previous prototype for 'hyp_early_alloc_page' [-Wmissing-prototypes]
      46 | void *hyp_early_alloc_page(void *arg)
         |       ^~~~~~~~~~~~~~~~~~~~
>> arch/arm64/kvm/hyp/nvhe/early_alloc.c:51:6: warning: no previous prototype for 'hyp_early_alloc_init' [-Wmissing-prototypes]
      51 | void hyp_early_alloc_init(unsigned long virt, unsigned long size)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +/hyp_early_alloc_nr_pages +18 arch/arm64/kvm/hyp/nvhe/early_alloc.c

    17	
  > 18	unsigned long hyp_early_alloc_nr_pages(void)
    19	{
    20		return (cur - base) >> PAGE_SHIFT;
    21	}
    22	
    23	extern void clear_page(void *to);
    24	
  > 25	void *hyp_early_alloc_contig(unsigned int nr_pages)
    26	{
    27		unsigned long ret = cur, i, p;
    28	
    29		if (!nr_pages)
    30			return NULL;
    31	
    32		cur += nr_pages << PAGE_SHIFT;
    33		if (cur > end) {
    34			cur = ret;
    35			return NULL;
    36		}
    37	
    38		for (i = 0; i < nr_pages; i++) {
    39			p = ret + (i << PAGE_SHIFT);
    40			clear_page((void *)(p));
    41		}
    42	
    43		return (void *)ret;
    44	}
    45	
  > 46	void *hyp_early_alloc_page(void *arg)
    47	{
    48		return hyp_early_alloc_contig(1);
    49	}
    50	
  > 51	void hyp_early_alloc_init(unsigned long virt, unsigned long size)

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