[android-common:android12-5.10 2/2] arch/arm64/kvm/hyp/include/hyp/switch.h:216:2: error: implicit declaration of function 'sve_cond_update_zcr_vq'

Hi Marc,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://android.googlesource.com/kernel/common android12-5.10
head:   1290154c48656bd1012a837076a0fbe379330eb3
commit: 1105b4d1cef4bc19ad20129a716194268c937eaf [2/2] BACKPORT: FROMGIT: KVM: arm64: Rework SVE host-save/guest-restore
config: arm64-randconfig-003-20260731 (https://download.01.org/0day-ci/archive/20260731/[email protected]/config)
compiler: aarch64-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260731/[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 errors (new ones prefixed by >>):

   In file included from arch/arm64/kvm/hyp/vhe/switch.c:8:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:216:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     216 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/vhe/switch.c: At top level:
   arch/arm64/kvm/hyp/vhe/switch.c:227:17: warning: no previous prototype for 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
     227 | asmlinkage void kvm_unexpected_el2_exception(void)
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kvm/hyp/nvhe/mem_protect.c:15:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:216:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     216 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kvm/hyp/nvhe/hyp-main.c:7:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:216:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     216 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/hyp-main.c: At top level:
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:233:6: warning: no previous prototype for 'handle_trap' [-Wmissing-prototypes]
     233 | void handle_trap(struct kvm_cpu_context *host_ctxt)
         |      ^~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kvm/hyp/nvhe/switch.c:8:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:216:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     216 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/switch.c: At top level:
   arch/arm64/kvm/hyp/nvhe/switch.c:282:17: warning: no previous prototype for 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
     282 | asmlinkage void kvm_unexpected_el2_exception(void)
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/sve_cond_update_zcr_vq +216 arch/arm64/kvm/hyp/include/hyp/switch.h

   213	
   214	static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
   215	{
 > 216		sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
   217		__sve_restore_state(vcpu_sve_pffr(vcpu),
   218				    &vcpu->arch.ctxt.fp_regs.fpsr);
   219		write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
   220	}
   221	

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