[android-common:android14-6.1-2025-09 0/1] arch/arm64/kvm/hyp/nvhe/mem_protect.c:635:5: warning: no previous prototype for '__pkvm_host_set_stage2_memattr'

[kernel test robot <lkp@intel.com>]

tree:   https://android.googlesource.com/kernel/common android14-6.1-2025-09
head:   b812b232b0959e0476d1809d64a4dda2fa4dc8e1
commit: d56ad709773a90012b44e87c0c233faebdcf5823 [0/1] ANDROID: arm64: Implement hypervisor workaround for SoCs with DMA beyond the PoC
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20251218/202512180010.zii3BuxO-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251218/202512180010.zii3BuxO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512180010.zii3BuxO-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/mem_protect.c:635:5: warning: no previous prototype for '__pkvm_host_set_stage2_memattr' [-Wmissing-prototypes]
     635 | int __pkvm_host_set_stage2_memattr(phys_addr_t phys, bool force_nc)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/__pkvm_host_set_stage2_memattr +635 arch/arm64/kvm/hyp/nvhe/mem_protect.c

   634	
 > 635	int __pkvm_host_set_stage2_memattr(phys_addr_t phys, bool force_nc)
   636	{
   637		kvm_pte_t pte;
   638		int ret = 0;
   639	
   640		if (!static_branch_unlikely(&pkvm_force_nc))
   641			return -ENOENT;
   642	
   643		phys = ALIGN_DOWN(phys, PAGE_SIZE);
   644		hyp_spin_lock(&host_mmu.lock);
   645	
   646		ret = kvm_pgtable_get_leaf(&host_mmu.pgt, phys, &pte, NULL);
   647		if (ret)
   648			goto unlock;
   649	
   650		if (!addr_is_memory(phys)) {
   651			ret = -EIO;
   652			goto unlock;
   653		}
   654	
   655		if (!kvm_pte_valid(pte) && pte) {
   656			switch (pte) {
   657			case DEFERRED_MEMATTR_NOTE:
   658				break;
   659			default:
   660				ret = -EPERM;
   661			}
   662		} else if (host_get_page_state(pte, phys) != PKVM_PAGE_OWNED) {
   663			ret = -EPERM;
   664		}
   665	
   666		if (ret)
   667			goto unlock;
   668	
   669		if (force_nc) {
   670			ret = host_stage2_idmap_locked(phys, PAGE_SIZE,
   671						       PKVM_HOST_MEM_PROT |
   672						       KVM_PGTABLE_PROT_NC,
   673						       false);
   674			if (ret)
   675				goto unlock;
   676	
   677			kvm_flush_dcache_to_poc(hyp_fixmap_map_nc(phys), PAGE_SIZE);
   678			hyp_fixmap_unmap();
   679		} else {
   680			ret = kvm_pgtable_stage2_annotate(&host_mmu.pgt, phys,
   681							  PAGE_SIZE, &host_s2_pool,
   682							  DEFERRED_MEMATTR_NOTE);
   683		}
   684	unlock:
   685		hyp_spin_unlock(&host_mmu.lock);
   686		return ret;
   687	}
   688	

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