linux-kernel - arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: expecting prototype for Handler for protected floating(). Prototype was for kvm_handle_pvm

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Date:   Sat, 30 Apr 2022 02:30:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Fuad Tabba <tabba@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>
Subject: arch/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@...el.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	

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