linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10 4728/5866] arch/arm64/kvm/fpsimd.c:129:5: error: implicit declaration of function 'sve_cond_update_zcr

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Date:   Thu, 27 Jan 2022 06:26:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...weeb.org>,
        linux-kernel@...r.kernel.org, Quentin Perret <qperret@...gle.com>,
        Will Deacon <willdeacon@...gle.com>
Subject: [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10
 4728/5866] arch/arm64/kvm/fpsimd.c:129:5: error: implicit declaration of
 function 'sve_cond_update_zcr_vq'

Hi Marc,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-trusty-5.10
head:   52cdd137fae0b001197a51646289e3cbdda921d5
commit: b0e15c8c44275afef4aacfb1560e38b974b02ac8 [4728/5866] FROMGIT: KVM: arm64: Save/restore SVE state for nVHE
config: arm64-randconfig-r022-20220124 (https://download.01.org/0day-ci/archive/20220127/202201270637.CwoQKBGC-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2a1b7aa016c0f4b5598806205bdfbab1ea2d92c4)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/b0e15c8c44275afef4aacfb1560e38b974b02ac8
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-trusty-5.10
        git checkout b0e15c8c44275afef4aacfb1560e38b974b02ac8
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> arch/arm64/kvm/fpsimd.c:129:5: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror,-Wimplicit-function-declaration]
                                   sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1,
                                   ^
   1 error generated.


vim +/sve_cond_update_zcr_vq +129 arch/arm64/kvm/fpsimd.c

   108	
   109	/*
   110	 * Write back the vcpu FPSIMD regs if they are dirty, and invalidate the
   111	 * cpu FPSIMD regs so that they can't be spuriously reused if this vcpu
   112	 * disappears and another task or vcpu appears that recycles the same
   113	 * struct fpsimd_state.
   114	 */
   115	void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
   116	{
   117		unsigned long flags;
   118		bool host_has_sve = system_supports_sve();
   119		bool guest_has_sve = vcpu_has_sve(vcpu);
   120	
   121		local_irq_save(flags);
   122	
   123		if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
   124			if (guest_has_sve) {
   125				__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
   126	
   127				/* Restore the VL that was saved when bound to the CPU */
   128				if (!has_vhe())
 > 129					sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1,

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org