[openeuler:OLK-5.10 27225/30000] arch/x86/kvm/x86.c:893:6: warning: no previous prototype for 'kvm_post_set_cr0'

[kernel test robot <lkp@intel.com>]

Hi Yu,

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

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   b32a887db4e5c4c061e61977efabbc1d5e867aa7
commit: 1686d271f795f8756b49151978b95b095c0598ad [27225/30000] KVM: x86: Introduce kvm_post_set_cr0 to post handle the CR0 emulation
config: x86_64-buildonly-randconfig-005-20240828 (https://download.01.org/0day-ci/archive/20240828/202408280830.Hi3clUWN-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240828/202408280830.Hi3clUWN-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408280830.Hi3clUWN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kvm/x86.c:893:6: warning: no previous prototype for 'kvm_post_set_cr0' [-Wmissing-prototypes]
     893 | void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0)
         |      ^~~~~~~~~~~~~~~~


vim +/kvm_post_set_cr0 +893 arch/x86/kvm/x86.c

   892	
 > 893	void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0)
   894	{
   895		unsigned long update_bits = X86_CR0_PG | X86_CR0_WP;
   896	
   897		if ((cr0 ^ old_cr0) & X86_CR0_PG) {
   898			kvm_clear_async_pf_completion_queue(vcpu);
   899			kvm_async_pf_hash_reset(vcpu);
   900		}
   901	
   902		if ((cr0 ^ old_cr0) & update_bits)
   903			kvm_mmu_reset_context(vcpu);
   904	
   905		if (((cr0 ^ old_cr0) & X86_CR0_CD) &&
   906		    kvm_arch_has_noncoherent_dma(vcpu->kvm) &&
   907		    !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
   908			kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL);
   909	}
   910	

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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki