[dwmw2:gpc-stealtime 1/1] arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations

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

tree:   git://git.infradead.org/users/dwmw2/linux gpc-stealtime
head:   34c3f2e56cbf5d6b03946d531e66a91566d90db6
commit: 34c3f2e56cbf5d6b03946d531e66a91566d90db6 [1/1] KVM: x86: Use gfn_to_pfn_cache for record_steal_time
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260204/202602040904.0eXBWOvu-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260204/202602040904.0eXBWOvu-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/202602040904.0eXBWOvu-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    5242 |         kvm_gpc_mark_dirty(gpc);
         |         ^
   1 error generated.


vim +/kvm_gpc_mark_dirty +5242 arch/x86/kvm/x86.c

  5201	
  5202	static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
  5203	{
  5204		struct gfn_to_pfn_cache *gpc = &vcpu->arch.st.cache;
  5205		struct kvm_steal_time *st;
  5206		static const u8 preempted = KVM_VCPU_PREEMPTED;
  5207		unsigned long flags;
  5208	
  5209		/*
  5210		 * The vCPU can be marked preempted if and only if the VM-Exit was on
  5211		 * an instruction boundary and will not trigger guest emulation of any
  5212		 * kind (see vcpu_run).  Vendor specific code controls (conservatively)
  5213		 * when this is true, for example allowing the vCPU to be marked
  5214		 * preempted if and only if the VM-Exit was due to a host interrupt.
  5215		 */
  5216		if (!vcpu->arch.at_instruction_boundary) {
  5217			vcpu->stat.preemption_other++;
  5218			return;
  5219		}
  5220	
  5221		vcpu->stat.preemption_reported++;
  5222		if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
  5223			return;
  5224	
  5225		if (vcpu->arch.st.preempted)
  5226			return;
  5227	
  5228		/* This happens on process exit */
  5229		if (unlikely(current->mm != vcpu->kvm->mm))
  5230			return;
  5231	
  5232		read_lock_irqsave(&gpc->lock, flags);
  5233		if (!kvm_gpc_check(gpc, sizeof(*st)))
  5234			goto out_unlock_gpc;
  5235	
  5236		st = (struct kvm_steal_time *)gpc->khva;
  5237		BUILD_BUG_ON(sizeof(st->preempted) != sizeof(preempted));
  5238	
  5239		st->preempted = preempted;
  5240		vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
  5241	
> 5242		kvm_gpc_mark_dirty(gpc);
  5243	
  5244	out_unlock_gpc:
  5245		read_unlock_irqrestore(&gpc->lock, flags);
  5246	}
  5247	

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