[android-common:android16-6.12 4/4] arch/arm64/kvm/hyp/nvhe/switch.c:391:5: warning: no previous prototype for function '__pkvm_register_hyp_panic_notifier'

[android-common:android16-6.12 4/4] arch/arm64/kvm/hyp/nvhe/switch.c:391:5: warning: no previous prototype for function '__pkvm_register_hyp_panic_notifier'

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common android16-6.12
head:   125206b4d7d6898a8a5d0c088a5ba75114266b81
commit: 4b5a009cd21622260e1f19afbd0ff7440102b6d8 [4/4] ANDROID: KVM: arm64: Introduce a hyp panic module notifier
config: arm64-randconfig-2002-20250814 (https://download.01.org/0day-ci/archive/20250814/202508141942.Fs8FOjug-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 7d886fab74d4037d654d02bed24dd97c0ba863d6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250814/202508141942.Fs8FOjug-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/202508141942.Fs8FOjug-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/switch.c:391:5: warning: no previous prototype for function '__pkvm_register_hyp_panic_notifier' [-Wmissing-prototypes]
     391 | int __pkvm_register_hyp_panic_notifier(void (*cb)(struct user_pt_regs *regs))
         |     ^
   arch/arm64/kvm/hyp/nvhe/switch.c:391:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     391 | int __pkvm_register_hyp_panic_notifier(void (*cb)(struct user_pt_regs *regs))
         | ^
         | static 
   1 warning generated.


vim +/__pkvm_register_hyp_panic_notifier +391 arch/arm64/kvm/hyp/nvhe/switch.c

   389	
   390	static void (*hyp_panic_notifier)(struct user_pt_regs *regs);
 > 391	int __pkvm_register_hyp_panic_notifier(void (*cb)(struct user_pt_regs *regs))
   392	{
   393		return cmpxchg(&hyp_panic_notifier, NULL, cb) ? -EBUSY : 0;
   394	}
   395	

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