[PATCH v2] RISC-V: KVM: Add kvm-riscv.wfi_trap_policy to control VS-mode WFI trapping

[kernel test robot]

Hi Yuhang.Chen,

kernel test robot noticed the following build errors:

[auto build test ERROR on kvm/queue]
[also build test ERROR on kvm/next mst-vhost/linux-next linus/master v7.2-rc6 next-20260804]
[cannot apply to kvm/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yuhang-Chen/RISC-V-KVM-Add-kvm-riscv-wfi_trap_policy-to-control-VS-mode-WFI-trapping/20260805-030043
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20260804024707.2400404-1-yhchen312%40gmail.com
patch subject: [PATCH v2] RISC-V: KVM: Add kvm-riscv.wfi_trap_policy to control VS-mode WFI trapping
config: riscv-randconfig-001-20260805 (https://download.01.org/0day-ci/archive/20260805/202608051354.KYOXP5po-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260805/202608051354.KYOXP5po-lkp@intel.com/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 <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608051354.KYOXP5po-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> arch/riscv/kvm/vcpu.c:60:13: error: expected declaration specifiers or '...' before string constant
    early_param("kvm-riscv.wfi_trap_policy", early_kvm_riscv_wfi_trap_policy_cfg);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/riscv/kvm/vcpu.c:60:42: error: expected declaration specifiers or '...' before 'early_kvm_riscv_wfi_trap_policy_cfg'
    early_param("kvm-riscv.wfi_trap_policy", early_kvm_riscv_wfi_trap_policy_cfg);
                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/riscv/kvm/vcpu.c:43:19: warning: 'early_kvm_riscv_wfi_trap_policy_cfg' defined but not used [-Wunused-function]
    static int __init early_kvm_riscv_wfi_trap_policy_cfg(char *arg)
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +60 arch/riscv/kvm/vcpu.c

    39	
    40	static enum kvm_riscv_wfi_trap_policy kvm_riscv_wfi_trap_policy __read_mostly =
    41		KVM_RISCV_WFI_TRAP;
    42	
  > 43	static int __init early_kvm_riscv_wfi_trap_policy_cfg(char *arg)
    44	{
    45		if (!arg)
    46			return -EINVAL;
    47	
    48		if (strcmp(arg, "trap") == 0) {
    49			kvm_riscv_wfi_trap_policy = KVM_RISCV_WFI_TRAP;
    50			return 0;
    51		}
    52	
    53		if (strcmp(arg, "auto") == 0) {
    54			kvm_riscv_wfi_trap_policy = KVM_RISCV_WFI_AUTO;
    55			return 0;
    56		}
    57	
    58		return -EINVAL;
    59	}
  > 60	early_param("kvm-riscv.wfi_trap_policy", early_kvm_riscv_wfi_trap_policy_cfg);
    61	

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