[broonie-ci:kvm-arm64-sme 23/30] arch/arm64/kvm/hyp/include/hyp/switch.h:518:7: warning: unused variable 'max_len'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git kvm-arm64-sme
head:   b53a1666379c25919672622adc3e3984693ef9a1
commit: 68a05d441f4a2bbe2e9d717764fb171c99f9ec30 [23/30] KVM: arm64: Context switch SME state for guests
config: arm64-randconfig-001-20260708 (https://download.01.org/0day-ci/archive/20260711/[email protected]/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 0a2fb2a2269da0e2a3e230beb6cad39ca314db33)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260711/[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 >>):

   In file included from arch/arm64/kvm/hyp/vhe/switch.c:7:
   arch/arm64/kvm/hyp/include/hyp/switch.h:489:6: warning: unused variable 'zcr_el2' [-Wunused-variable]
     489 |         u64 zcr_el2 = vcpu_sve_max_vq(vcpu) - 1;
         |             ^~~~~~~
>> arch/arm64/kvm/hyp/include/hyp/switch.h:518:7: warning: unused variable 'max_len' [-Wunused-variable]
     518 |                 u64 max_len = vcpu_sme_max_vq(vcpu) - 1;
         |                     ^~~~~~~
>> arch/arm64/kvm/hyp/include/hyp/switch.h:519:7: warning: unused variable 'smcr_len' [-Wunused-variable]
     519 |                 u64 smcr_len = SYS_FIELD_GET(SMCR_ELx, LEN,
         |                     ^~~~~~~~
   3 warnings generated.


vim +/max_len +518 arch/arm64/kvm/hyp/include/hyp/switch.h

   498	
   499	static inline void __hyp_nv_restore_guest_vls(struct kvm_vcpu *vcpu)
   500	{
   501		if (!is_nested_ctxt(vcpu))
   502			return;
   503	
   504		/*
   505		 * The effective VL for a VM could differ from the max VL when running a
   506		 * nested guest, as the guest hypervisor could select a smaller VL. Slap
   507		 * that into hardware before wrapping up.
   508		 */
   509	
   510		if (vcpu_has_sve(vcpu)) {
   511			u64 zcr_el2 = vcpu_sve_max_vq(vcpu) - 1;
   512	
   513			zcr_el2 = min(zcr_el2, __vcpu_sys_reg(vcpu, ZCR_EL2));
   514			sve_cond_update_zcr_vq(zcr_el2, SYS_ZCR_EL2);
   515		}
   516	
   517		if (vcpu_has_sme(vcpu)) {
 > 518			u64 max_len = vcpu_sme_max_vq(vcpu) - 1;
 > 519			u64 smcr_len = SYS_FIELD_GET(SMCR_ELx, LEN,
   520						     __vcpu_sys_reg(vcpu, SMCR_EL2));
   521	
   522			sme_cond_update_smcr_vq(min(smcr_len, max_len), SYS_SMCR_EL2);
   523		}
   524	}
   525	

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