[dwmw2:kvmclock6 12/36] arch/x86/kvm/x86.c:3249:1: warning: label 'fallback' defined but not used

[kernel test robot <lkp@intel.com>]

tree:   git://git.infradead.org/users/dwmw2/linux kvmclock6
head:   f0cde567611e75fa2459c24c7aea06d619f07f8b
commit: 0dba225ab43627430d6b2f8be1143ea133116e96 [12/36] KVM: x86: Restructure get_kvmclock()
config: i386-buildonly-randconfig-004-20260612 (https://download.01.org/0day-ci/archive/20260612/202606121847.WMpRF92x-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260612/202606121847.WMpRF92x-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/202606121847.WMpRF92x-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/kvm/x86.c: In function 'get_kvmclock':
>> arch/x86/kvm/x86.c:3249:1: warning: label 'fallback' defined but not used [-Wunused-label]
    3249 | fallback:
         | ^~~~~~~~
>> arch/x86/kvm/x86.c:3206:39: warning: unused variable 'hv_clock' [-Wunused-variable]
    3206 |         struct pvclock_vcpu_time_info hv_clock;
         |                                       ^~~~~~~~


vim +/fallback +3249 arch/x86/kvm/x86.c

  3202	
  3203	static void get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data)
  3204	{
  3205		struct kvm_arch *ka = &kvm->arch;
> 3206		struct pvclock_vcpu_time_info hv_clock;
  3207		unsigned int seq;
  3208	
  3209		do {
  3210			seq = read_seqcount_begin(&ka->pvclock_sc);
  3211	
  3212			data->flags = 0;
  3213	#ifdef CONFIG_X86_64
  3214			if (ka->use_master_clock) {
  3215				struct timespec64 ts;
  3216	
  3217				/*
  3218				 * The RDTSC and get_cpu_tsc_khz() must happen on
  3219				 * the same CPU.
  3220				 */
  3221				get_cpu();
  3222	
  3223				if (kvm_get_walltime_and_clockread(&ts, &data->host_tsc)) {
  3224					data->realtime = ts.tv_nsec + NSEC_PER_SEC * ts.tv_sec;
  3225					data->flags |= KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC;
  3226				} else {
  3227					/*
  3228					 * Clock read failed (e.g. clocksource is
  3229					 * transitioning away from TSC). Fall back to
  3230					 * the non-master-clock path rather than
  3231					 * spinning.
  3232					 */
  3233					put_cpu();
  3234					goto fallback;
  3235				}
  3236	
  3237				data->flags |= KVM_CLOCK_TSC_STABLE;
  3238				hv_clock.tsc_timestamp = ka->master_cycle_now;
  3239				hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
  3240				kvm_get_time_scale(NSEC_PER_SEC, get_cpu_tsc_khz() * 1000LL,
  3241						   &hv_clock.tsc_shift,
  3242						   &hv_clock.tsc_to_system_mul);
  3243				data->clock = __pvclock_read_cycles(&hv_clock, data->host_tsc);
  3244	
  3245				put_cpu();
  3246			} else
  3247	#endif
  3248			{
> 3249	fallback:
  3250				data->clock = get_kvmclock_base_ns() + ka->kvmclock_offset;
  3251			}
  3252		} while (read_seqcount_retry(&ka->pvclock_sc, seq));
  3253	}
  3254	

--
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https://github.com/intel/lkp-tests/wiki