[android-common:mirror-poly-aosp-pixel-malibu-staging 4/4] arch/arm64/kvm/hyp/nvhe/serial.c:42:6: warning: no previous prototype for 'hyp_puts'

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

tree:   https://android.googlesource.com/kernel/common mirror-poly-aosp-pixel-malibu-staging
head:   5de4567efb4a2a85c5768504b0f45f278e9b13a2
commit: ea53aa5d800829a9adc17df0b6615eb845a9314b [4/4] ANDROID: KVM: arm64: Add serial framework for pKVM
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20260330/202603301804.G7ByGunz-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260330/202603301804.G7ByGunz-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/202603301804.G7ByGunz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/serial.c:42:6: warning: no previous prototype for 'hyp_puts' [-Wmissing-prototypes]
      42 | void hyp_puts(const char *s)
         |      ^~~~~~~~
>> arch/arm64/kvm/hyp/nvhe/serial.c:54:6: warning: no previous prototype for 'hyp_putx64' [-Wmissing-prototypes]
      54 | void hyp_putx64(u64 x)
         |      ^~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/serial.c:60:6: warning: no previous prototype for 'hyp_putc' [-Wmissing-prototypes]
      60 | void hyp_putc(char c)
         |      ^~~~~~~~
>> arch/arm64/kvm/hyp/nvhe/serial.c:66:5: warning: no previous prototype for '__pkvm_register_serial_driver' [-Wmissing-prototypes]
      66 | int __pkvm_register_serial_driver(void (*cb)(char))
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/hyp_puts +42 arch/arm64/kvm/hyp/nvhe/serial.c

    41	
  > 42	void hyp_puts(const char *s)
    43	{
    44		if (!hyp_serial_enabled())
    45			return;
    46	
    47		while (*s)
    48			__hyp_putc(*s++);
    49	
    50		__hyp_putc('\n');
    51		__hyp_putc('\r');
    52	}
    53	
  > 54	void hyp_putx64(u64 x)
    55	{
    56		if (hyp_serial_enabled())
    57			__hyp_putx4n(x, 64);
    58	}
    59	
    60	void hyp_putc(char c)
    61	{
    62		if (hyp_serial_enabled())
    63			__hyp_putc(c);
    64	}
    65	
  > 66	int __pkvm_register_serial_driver(void (*cb)(char))

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