[android-common:android16-6.12-lts 1/1] arch/arm64/kvm/iommu.c:153:58: sparse: sparse: Using plain integer as NULL pointer

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

tree:   https://android.googlesource.com/kernel/common android16-6.12-lts
head:   57041e4a7e52342473871000827584f966d8cbd3
commit: 9dabecc2a2c31f11239b0853839bfc860de071e0 [1/1] ANDROID: KVM: arm64: iommu: Add memcache for guest pvIOMMU
config: arm64-randconfig-r123-20260910 (https://download.01.org/0day-ci/archive/20260918/202609181647.ibpzYHY2-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project d3db069999553568848400c84cbf815c03f5470f)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260918/202609181647.ibpzYHY2-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/202609181647.ibpzYHY2-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/arm64/kvm/iommu.c:153:58: sparse: sparse: Using plain integer as NULL pointer
   arch/arm64/kvm/iommu.c:162:50: sparse: sparse: Using plain integer as NULL pointer

vim +153 arch/arm64/kvm/iommu.c

   145	
   146	int kvm_iommu_guest_alloc_mc(struct kvm_hyp_memcache *mc, u32 pgsize, u32 nr_pages)
   147	{
   148		u8 order = get_order(pgsize);
   149	
   150		/* Driver might have dedicated allocator especially if it needs large pages. */
   151		if (iommu_driver && iommu_driver->guest_alloc && iommu_driver->guest_free)
   152			return __topup_hyp_memcache(mc, nr_pages, iommu_driver->guest_alloc,
 > 153						    kvm_host_pa, 0, order);
   154	
   155		return topup_hyp_memcache(mc, nr_pages, order);
   156	}
   157	

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