Hi James, kernel test robot noticed the following build warnings: [auto build test WARNING on a27e0515592ec9ca28e0d027f42568c47b314784] url: https://github.com/intel-lab-lkp/linux/commits/James-Houghton/KVM-Remove-kvm_handle_hva_range-helper-functions/20241106-025133 base: a27e0515592ec9ca28e0d027f42568c47b314784 patch link: https://lore.kernel.org/r/20241105184333.2305744-5-jthoughton%40google.com patch subject: [PATCH v8 04/11] KVM: x86/mmu: Relax locking for kvm_test_age_gfn and kvm_age_gfn config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20241106/202411061526.RAuCXKJh-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241106/202411061526.RAuCXKJh-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202411061526.RAuCXKJh-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): arch/x86/kvm/mmu/tdp_mmu.c: In function 'kvm_tdp_mmu_age_spte': >> arch/x86/kvm/mmu/tdp_mmu.c:1189:23: warning: ignoring return value of '__tdp_mmu_set_spte_atomic' declared with attribute 'warn_unused_result' [-Wunused-result] 1189 | (void)__tdp_mmu_set_spte_atomic(iter, new_spte); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +1189 arch/x86/kvm/mmu/tdp_mmu.c 1166 1167 /* 1168 * Mark the SPTEs range of GFNs [start, end) unaccessed and return non-zero 1169 * if any of the GFNs in the range have been accessed. 1170 * 1171 * No need to mark the corresponding PFN as accessed as this call is coming 1172 * from the clear_young() or clear_flush_young() notifier, which uses the 1173 * return value to determine if the page has been accessed. 1174 */ 1175 static void kvm_tdp_mmu_age_spte(struct tdp_iter *iter) 1176 { 1177 u64 new_spte; 1178 1179 if (spte_ad_enabled(iter->old_spte)) { 1180 iter->old_spte = tdp_mmu_clear_spte_bits_atomic(iter->sptep, 1181 shadow_accessed_mask); 1182 new_spte = iter->old_spte & ~shadow_accessed_mask; 1183 } else { 1184 new_spte = mark_spte_for_access_track(iter->old_spte); 1185 /* 1186 * It is safe for the following cmpxchg to fail. Leave the 1187 * Accessed bit set, as the spte is most likely young anyway. 1188 */ > 1189 (void)__tdp_mmu_set_spte_atomic(iter, new_spte); 1190 } 1191 1192 trace_kvm_tdp_mmu_spte_changed(iter->as_id, iter->gfn, iter->level, 1193 iter->old_spte, new_spte); 1194 } 1195 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
