[mark:arm64/kvm/fpsimd-fixes 8/11] arch/arm64/kvm/hyp/include/hyp/switch.h:380:15: warning: variable 'zcr_el2' set but not used

[mark:arm64/kvm/fpsimd-fixes 8/11] arch/arm64/kvm/hyp/include/hyp/switch.h:380:15: warning: variable 'zcr_el2' set but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/kvm/fpsimd-fixes
head:   246fa113d11e53f51bf13b25bcf85161c2290b37
commit: 9b573af2d7bae55e446e8d422b6ec87a144d3148 [8/11] KVM: arm64: Eagerly switch ZCR_EL{1,2}
config: arm64-randconfig-003-20250206 (https://download.01.org/0day-ci/archive/20250206/202502061341.FvsCMKEH-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250206/202502061341.FvsCMKEH-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/202502061341.FvsCMKEH-lkp@intel.com/

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:380:15: warning: variable 'zcr_el2' set but not used [-Wunused-but-set-variable]
           u64 zcr_el1, zcr_el2;
                        ^
   arch/arm64/kvm/hyp/include/hyp/switch.h:401:15: warning: variable 'zcr_el2' set but not used [-Wunused-but-set-variable]
           u64 zcr_el1, zcr_el2;
                        ^
   2 warnings generated.


vim +/zcr_el2 +380 arch/arm64/kvm/hyp/include/hyp/switch.h

   377	
   378	static inline void fpsimd_lazy_switch_to_guest(struct kvm_vcpu *vcpu)
   379	{
 > 380		u64 zcr_el1, zcr_el2;
   381	
   382		if (!guest_owns_fp_regs())
   383			return;
   384	
   385		if (vcpu_has_sve(vcpu)) {
   386			/* A guest hypervisor may restrict the effective max VL. */
   387			if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu))
   388				zcr_el2 = __vcpu_sys_reg(vcpu, ZCR_EL2);
   389			else
   390				zcr_el2 = vcpu_sve_max_vq(vcpu) - 1;
   391	
   392			sve_cond_update_zcr_vq(zcr_el2, SYS_ZCR_EL2);
   393	
   394			zcr_el1 = __vcpu_sys_reg(vcpu, vcpu_sve_zcr_elx(vcpu));
   395			write_sysreg_el1(zcr_el1, SYS_ZCR);
   396		}
   397	}
   398	

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