[android-common:android15-6.6-2026-07 8/8] arch/arm64/kvm/hyp/include/hyp/switch.h:265:6: warning: unused variable 'zcr_el2'

kernel test robot <[email protected]>
Newsgroups dev.linux.lists.oe-kbuild-all
Message-ID <[email protected]> 
Hi Fuad,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android15-6.6-2026-07
head:   407989faed8855296b26bfb40a621f478331816c
commit: 2b5e5cbdf01152384c781bb7edd7a778c1419b3a [8/8] ANDROID: KVM: arm64: Use active guest SVE vector length on save/restore
config: arm64-randconfig-003 (https://download.01.org/0day-ci/archive/20260717/[email protected]/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260717/[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:
   In file included from arch/arm64/kvm/hyp/include/hyp/switch.h:10:
   In file included from arch/arm64/kvm/hyp/include/hyp/adjust_pc.h:13:
   In file included from arch/arm64/include/asm/kvm_emulate.h:14:
   In file included from include/linux/kvm_host.h:16:
   In file included from include/linux/mm.h:2180:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/arm64/kvm/hyp/vhe/switch.c:7:
>> arch/arm64/kvm/hyp/include/hyp/switch.h:265:6: warning: unused variable 'zcr_el2' [-Wunused-variable]
     265 |         u64 zcr_el2 = min(zcr_el1, vcpu_sve_max_vq(vcpu) - 1ULL);
         |             ^~~~~~~
   6 warnings generated.
--
   In file included from arch/arm64/kvm/hyp/nvhe/switch.c:7:
   In file included from arch/arm64/kvm/hyp/include/hyp/switch.h:10:
   In file included from arch/arm64/kvm/hyp/include/hyp/adjust_pc.h:13:
   In file included from arch/arm64/include/asm/kvm_emulate.h:14:
   In file included from include/linux/kvm_host.h:16:
   In file included from include/linux/mm.h:2180:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/arm64/kvm/hyp/nvhe/switch.c:7:
>> arch/arm64/kvm/hyp/include/hyp/switch.h:265:6: warning: unused variable 'zcr_el2' [-Wunused-variable]
     265 |         u64 zcr_el2 = min(zcr_el1, vcpu_sve_max_vq(vcpu) - 1ULL);
         |             ^~~~~~~
   arch/arm64/kvm/hyp/nvhe/switch.c:216:7: warning: unused variable 'vq_len' [-Wunused-variable]
     216 |                 u64 vq_len = sve_vq_from_vl(kvm_host_sve_max_vl) - 1;
         |                     ^~~~~~
   arch/arm64/kvm/hyp/nvhe/switch.c:414:5: warning: no previous prototype for function '__pkvm_register_hyp_panic_notifier' [-Wmissing-prototypes]
     414 | int __pkvm_register_hyp_panic_notifier(void (*cb)(struct user_pt_regs *regs))
         |     ^
   arch/arm64/kvm/hyp/nvhe/switch.c:414:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     414 | int __pkvm_register_hyp_panic_notifier(void (*cb)(struct user_pt_regs *regs))
         | ^
         | static 
   8 warnings generated.
--
   In file included from arch/arm64/kvm/hyp/nvhe/hyp-main.c:7:
   In file included from include/kvm/arm_hypercalls.h:7:
   In file included from arch/arm64/include/asm/kvm_emulate.h:14:
   In file included from include/linux/kvm_host.h:16:
   In file included from include/linux/mm.h:2180:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:88:6: warning: no previous prototype for function '__pkvm_unmask_serror' [-Wmissing-prototypes]
      88 | void __pkvm_unmask_serror(void)
         |      ^
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:88:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      88 | void __pkvm_unmask_serror(void)
         | ^
         | static 
>> arch/arm64/kvm/hyp/nvhe/hyp-main.c:770:6: warning: unused variable 'zcr_el2' [-Wunused-variable]
     770 |         u64 zcr_el2 = min(zcr_el1, vcpu_sve_max_vq(vcpu) - 1ULL);
         |             ^~~~~~~
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:799:8: warning: unused variable 'vq_len' [-Wunused-variable]
     799 |                         u64 vq_len = sve_vq_from_vl(kvm_host_sve_max_vl) - 1;
         |                             ^~~~~~
   8 warnings generated.


vim +/zcr_el2 +265 arch/arm64/kvm/hyp/include/hyp/switch.h

   261	
   262	static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
   263	{
   264		u64 zcr_el1 = __vcpu_sys_reg(vcpu, ZCR_EL1);
 > 265		u64 zcr_el2 = min(zcr_el1, vcpu_sve_max_vq(vcpu) - 1ULL);
   266	
   267		write_sysreg_el1(zcr_el1, SYS_ZCR);
   268		sve_cond_update_zcr_vq(zcr_el2, SYS_ZCR_EL2);
   269		__sve_restore_state(vcpu_sve_pffr(vcpu),
   270				    &vcpu->arch.ctxt.fp_regs.fpsr);
   271		sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1ULL, SYS_ZCR_EL2);
   272	}
   273	

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