[kvm-x86:generic 7/9] include/linux/kvm_host.h:2106:5: warning: no previous prototype for 'kvm_init_irq_routing'

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

tree:   https://github.com/kvm-x86/linux generic
head:   96545c0ccf1cdcbeeaca77399af27da12da6c833
commit: 2207798ccd0adc8995a71f93fd77c8ece3eb330a [7/9] KVM: Setup empty IRQ routing when creating a VM
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20240611/202406111054.tfC7sg5g-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240611/202406111054.tfC7sg5g-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/202406111054.tfC7sg5g-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/include/asm/kvm_ppc.h:19,
                    from arch/powerpc/include/asm/dbell.h:17,
                    from arch/powerpc/kernel/asm-offsets.c:36:
>> include/linux/kvm_host.h:2106:5: warning: no previous prototype for 'kvm_init_irq_routing' [-Wmissing-prototypes]
    2106 | int kvm_init_irq_routing(struct kvm *kvm) {}
         |     ^~~~~~~~~~~~~~~~~~~~
   include/linux/kvm_host.h: In function 'kvm_init_irq_routing':
>> include/linux/kvm_host.h:2106:44: warning: control reaches end of non-void function [-Wreturn-type]
    2106 | int kvm_init_irq_routing(struct kvm *kvm) {}
         |                                            ^
--
   In file included from arch/powerpc/include/asm/kvm_ppc.h:19,
                    from arch/powerpc/include/asm/dbell.h:17,
                    from arch/powerpc/kernel/asm-offsets.c:36:
>> include/linux/kvm_host.h:2106:5: warning: no previous prototype for 'kvm_init_irq_routing' [-Wmissing-prototypes]
    2106 | int kvm_init_irq_routing(struct kvm *kvm) {}
         |     ^~~~~~~~~~~~~~~~~~~~
   include/linux/kvm_host.h: In function 'kvm_init_irq_routing':
>> include/linux/kvm_host.h:2106:44: warning: control reaches end of non-void function [-Wreturn-type]
    2106 | int kvm_init_irq_routing(struct kvm *kvm) {}
         |                                            ^


vim +/kvm_init_irq_routing +2106 include/linux/kvm_host.h

  2104	
  2105	static inline void kvm_free_irq_routing(struct kvm *kvm) {}
> 2106	int kvm_init_irq_routing(struct kvm *kvm) {}
  2107	

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