Hi Bibo, kernel test robot noticed the following build warnings:
[auto build test WARNING on 5eb4573ea63d0c83bf58fb7c243fc2c2b6966c02] url: https://github.com/intel-lab-lkp/linux/commits/Bibo-Mao/LoongArch-smp-Refine-some-ipi-functions-on-LoongArch-platform/20240428-180850 base: 5eb4573ea63d0c83bf58fb7c243fc2c2b6966c02 patch link: https://lore.kernel.org/r/20240428100518.1642324-4-maobibo%40loongson.cn patch subject: [PATCH v8 3/6] LoongArch: KVM: Add cpucfg area for kvm hypervisor config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20240429/202404290016.t9p5ghvr-...@intel.com/config) compiler: loongarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240429/202404290016.t9p5ghvr-...@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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202404290016.t9p5ghvr-...@intel.com/ All warnings (new ones prefixed by >>): arch/loongarch/kvm/exit.c: In function 'kvm_emu_cpucfg': >> arch/loongarch/kvm/exit.c:213:23: warning: variable 'plv' set but not used >> [-Wunused-but-set-variable] 213 | unsigned long plv; | ^~~ vim +/plv +213 arch/loongarch/kvm/exit.c 208 209 static int kvm_emu_cpucfg(struct kvm_vcpu *vcpu, larch_inst inst) 210 { 211 int rd, rj; 212 unsigned int index; > 213 unsigned long plv; 214 215 rd = inst.reg2_format.rd; 216 rj = inst.reg2_format.rj; 217 ++vcpu->stat.cpucfg_exits; 218 index = vcpu->arch.gprs[rj]; 219 220 /* 221 * By LoongArch Reference Manual 2.2.10.5 222 * Return value is 0 for undefined cpucfg index 223 * 224 * Disable preemption since hw gcsr is accessed 225 */ 226 preempt_disable(); 227 plv = kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD) >> CSR_CRMD_PLV_SHIFT; 228 switch (index) { 229 case 0 ... (KVM_MAX_CPUCFG_REGS - 1): 230 vcpu->arch.gprs[rd] = vcpu->arch.cpucfg[index]; 231 break; 232 case CPUCFG_KVM_SIG: 233 /* Cpucfg emulation between 0x40000000 -- 0x400000ff */ 234 vcpu->arch.gprs[rd] = *(unsigned int *)KVM_SIGNATURE; 235 break; 236 default: 237 vcpu->arch.gprs[rd] = 0; 238 break; 239 } 240 241 preempt_enable(); 242 return EMULATE_DONE; 243 } 244 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
