From: kernel test robot <lkp@intel.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [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
Date: Thu, 6 Feb 2025 13:13:15 +0800 [thread overview]
Message-ID: <202502061341.FvsCMKEH-lkp@intel.com> (raw)
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
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2025-02-06 5:13 UTC|newest]
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