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Subjectarch/arm64/kvm/hyp/nvhe/switch.c:196: warning: expecting prototype for Handler for protected floating(). Prototype was for kvm_handle_pvm_fpsimd() instead
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 38d741cb70b30741c0e802cbed7bd9cf4fd15fa4
commit: 1423afcb411780c7a6a68f801fdcfb6920ad6f06 KVM: arm64: Trap access to pVM restricted features
date: 7 months ago
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20220430/202204300241.xkeys5UL-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1423afcb411780c7a6a68f801fdcfb6920ad6f06
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 1423afcb411780c7a6a68f801fdcfb6920ad6f06
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 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@intel.com>

All warnings (new ones prefixed by >>):

arch/arm64/kvm/hyp/nvhe/switch.c:126: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* Disable host events, enable guest events
arch/arm64/kvm/hyp/nvhe/switch.c:146: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* Disable guest events, enable host events
arch/arm64/kvm/hyp/nvhe/switch.c:164: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* Handler for protected VM restricted exceptions.
arch/arm64/kvm/hyp/nvhe/switch.c:176: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* Handler for protected VM MSR, MRS or System instruction execution in AArch64.
arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: Function parameter or member 'vcpu' not described in 'kvm_handle_pvm_fpsimd'
arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: Function parameter or member 'exit_code' not described in 'kvm_handle_pvm_fpsimd'
>> arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: expecting prototype for Handler for protected floating(). Prototype was for kvm_handle_pvm_fpsimd() instead


vim +196 arch/arm64/kvm/hyp/nvhe/switch.c

188
189 /**
190 * Handler for protected floating-point and Advanced SIMD accesses.
191 *
192 * Returns true if the hypervisor has handled the exit, and control should go
193 * back to the guest, or false if it hasn't.
194 */
195 static bool kvm_handle_pvm_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
> 196 {
197 /* Linux guests assume support for floating-point and Advanced SIMD. */
198 BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_FP),
199 PVM_ID_AA64PFR0_ALLOW));
200 BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_ASIMD),
201 PVM_ID_AA64PFR0_ALLOW));
202
203 return kvm_hyp_handle_fpsimd(vcpu, exit_code);
204 }
205

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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