[tip:WIP.x86/core 28/29] arch/x86/kernel/cpu/acrn.c:52:2: error: implicit declaration of function 'entering_ack_irq'; did you mean 'spin_lock_irq'?

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/core
head:   830be9dae84c3a781f6d1594c4038c164bbae52b
commit: 6fc278e883365e67dd4a35e25b756d9d0c9d913c [28/29] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector
config: x86_64-randconfig-s505280430 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 6fc278e883365e67dd4a35e25b756d9d0c9d913c
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/acrn.c: In function 'acrn_hv_vector_handler':
>> arch/x86/kernel/cpu/acrn.c:52:2: error: implicit declaration of function 'entering_ack_irq'; did you mean 'spin_lock_irq'? [-Werror=implicit-function-declaration]
     entering_ack_irq();
     ^~~~~~~~~~~~~~~~
     spin_lock_irq
>> arch/x86/kernel/cpu/acrn.c:58:2: error: implicit declaration of function 'exiting_irq'; did you mean 'in_irq'? [-Werror=implicit-function-declaration]
     exiting_irq();
     ^~~~~~~~~~~
     in_irq
   cc1: some warnings being treated as errors

vim +52 arch/x86/kernel/cpu/acrn.c

    40	
    41	__visible void __irq_entry acrn_hv_vector_handler(struct pt_regs *regs)
    42	{
    43		struct pt_regs *old_regs = set_irq_regs(regs);
    44	
    45		/*
    46		 * The hypervisor requires that the APIC EOI should be acked.
    47		 * If the APIC EOI is not acked, the APIC ISR bit for the
    48		 * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
    49		 * will block the interrupt whose vector is lower than
    50		 * HYPERVISOR_CALLBACK_VECTOR.
    51		 */
  > 52		entering_ack_irq();
    53		inc_irq_stat(irq_hv_callback_count);
    54	
    55		if (acrn_intr_handler)
    56			acrn_intr_handler();
    57	
  > 58		exiting_irq();
    59		set_irq_regs(old_regs);
    60	}
    61	

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