[android-common:android17-6.18-2026-04 10/10] arch/arm64/kvm/pkvm.c:687:13: warning: variable 'pages' set but not used

[android-common:android17-6.18-2026-04 10/10] arch/arm64/kvm/pkvm.c:687:13: warning: variable 'pages' set but not used

[kernel test robot]

Hi Sebastian,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android17-6.18-2026-04
head:   edf956ebceeb7cdad6af1e86e3bc0f8ab20253ae
commit: 312ab0333e80d95c4c1f17fa07ceb344cec5313d [10/10] ANDROID: KVM: On guest exit ask Trustzone to relinquish the borrowed pages
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20260702/202607021923.YF0tmrex-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607021923.YF0tmrex-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/202607021923.YF0tmrex-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/arm64/kvm/pkvm.c: In function '__pkvm_pgtable_stage2_unmap':
>> arch/arm64/kvm/pkvm.c:687:13: warning: variable 'pages' set but not used [-Wunused-but-set-variable=]
     687 |         u64 pages, nr_busy;
         |             ^~~~~


vim +/pages +687 arch/arm64/kvm/pkvm.c

   679	
   680	static int __pkvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 start, u64 end)
   681	{
   682		struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
   683		pkvm_handle_t handle = kvm->arch.pkvm.handle;
   684		struct mm_struct *mm = current->mm;
   685		struct kvm_pinned_page *ppage;
   686		struct pkvm_mapping *mapping;
 > 687		u64 pages, nr_busy;
   688		int ret;
   689	
   690		if (!handle)
   691			return 0;
   692	
   693		for_each_mapping_in_range_safe(pgt, start, end, mapping) {
   694			int ret;
   695	
   696			WARN_ON(kvm_vm_is_protected(kvm));
   697	
   698			ret = kvm_call_hyp_nvhe(__pkvm_host_unshare_guest, handle,
   699							mapping->gfn, mapping->nr_pages);
   700	
   701			if (WARN_ON(ret))
   702				return ret;
   703	
   704			pkvm_mapping_remove(mapping, &pgt->pkvm_mappings);
   705			kfree(mapping);
   706		}
   707	
   708	retry:
   709		pages = 0;
   710		nr_busy = 0;
   711		ppage = kvm_pinned_pages_iter_first(&kvm->arch.pkvm.pinned_pages, start, end);
   712		while (ppage) {
   713			struct kvm_pinned_page *next = kvm_pinned_pages_iter_next(ppage, start, end);
   714	
   715			WARN_ON(!kvm_vm_is_protected(kvm));
   716			ret = __reclaim_dying_page(ppage, handle);
   717			cond_resched();
   718			if (ret == -EBUSY) {
   719				nr_busy++;
   720				ppage = next;
   721				continue;
   722			}
   723			WARN_ON(ret);
   724			unpin_user_pages_dirty_lock(&ppage->page, 1, true);
   725			account_locked_vm(mm, 1 << ppage->order, false);
   726			kvm_pinned_pages_remove(ppage, &kvm->arch.pkvm.pinned_pages);
   727			kfree(ppage);
   728			ppage = next;
   729		}
   730	
   731		if (nr_busy) {
   732			do {
   733				ret = kvm_call_hyp_nvhe(__pkvm_reclaim_dying_guest_ffa_resources,
   734							kvm->arch.pkvm.handle);
   735				WARN_ON(ret && ret != -EAGAIN);
   736				cond_resched();
   737			} while (ret == -EAGAIN);
   738			goto retry;
   739		}
   740	
   741		return 0;
   742	}
   743	

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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki