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SubjectRe: [PATCH v8 3/6] LoongArch: KVM: Add cpucfg area for kvm hypervisor
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-lkp@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-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/202404290016.T9p5GhVr-lkp@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

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