Hi, kernel test robot noticed the following build warnings:
[auto build test WARNING on kvm/queue] [also build test WARNING on kvm/next mst-vhost/linux-next linus/master v6.18-rc6 next-20251120] [cannot apply to kvm/linux-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/griffoul-gmail-com/KVM-nVMX-Implement-cache-for-L1-MSR-bitmap/20251119-012332 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue patch link: https://lore.kernel.org/r/20251118171113.363528-9-griffoul%40gmail.org patch subject: [PATCH v2 08/10] KVM: x86: Add nested context management config: i386-randconfig-141-20251120 (https://download.01.org/0day-ci/archive/20251121/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251121/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> arch/x86/kvm/nested.c:133:10: warning: expression which evaluates to zero >> treated as a null pointer constant of type 'struct kvm_nested_context *' >> [-Wnon-literal-null-conversion] 133 | return false; | ^~~~~ 1 warning generated. vim +133 arch/x86/kvm/nested.c 122 123 struct kvm_nested_context *kvm_nested_context_load(struct kvm_vcpu *vcpu, 124 gpa_t gpa) 125 { 126 struct kvm_nested_context_table *table; 127 struct kvm_nested_context *ctx, *new_ctx = NULL; 128 struct kvm *vm = vcpu->kvm; 129 bool reset = false; 130 131 table = vcpu->kvm->arch.nested_context_table; 132 if (WARN_ON_ONCE(!table)) > 133 return false; 134 retry: 135 spin_lock(&table->lock); 136 ctx = kvm_nested_context_find(table, vcpu, gpa); 137 if (!ctx) { 138 /* At capacity? Recycle the LRU context */ 139 if (table->count >= kvm_nested_context_max(vcpu->kvm)) { 140 ctx = kvm_nested_context_recycle(table); 141 if (unlikely(!ctx)) 142 goto finish; 143 144 kvm_nested_context_insert(table, ctx, gpa); 145 ++vm->stat.nested_context_recycle; 146 reset = true; 147 148 } else if (new_ctx) { 149 ++table->count; 150 ctx = new_ctx; 151 kvm_nested_context_insert(table, ctx, gpa); 152 new_ctx = NULL; 153 154 } else { 155 /* Allocate a new context without holding the lock */ 156 spin_unlock(&table->lock); 157 new_ctx = kvm_x86_ops.nested_ops->alloc_context(vcpu); 158 if (unlikely(!new_ctx)) 159 return NULL; 160 161 goto retry; 162 } 163 } else 164 ++vm->stat.nested_context_reuse; 165 166 ctx->vcpu = vcpu; 167 finish: 168 spin_unlock(&table->lock); 169 170 if (new_ctx) 171 kvm_x86_ops.nested_ops->free_context(new_ctx); 172 173 if (reset) 174 kvm_x86_ops.nested_ops->reset_context(ctx); 175 176 return ctx; 177 } 178 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
