[openeuler:OLK-6.6 2229/2229] drivers/crypto/ccp/hygon/psp-dev.c:25:10: warning: no previous prototype for function 'atomic64_exchange'

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   a53913bacac4876eee9ce118b3101dff842318ef
commit: fe08767e3a083e73a72f08432bc6fbd864fa7179 [2229/2229] drivers/crypto/ccp: concurrent psp access support between user and kernel space
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250515/202505150643.AFNuSCPC-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
rustc: rustc 1.73.0 (cc66ad468 2023-10-03)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250515/202505150643.AFNuSCPC-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/202505150643.AFNuSCPC-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/crypto/ccp/hygon/psp-dev.c:25:10: warning: no previous prototype for function 'atomic64_exchange' [-Wmissing-prototypes]
      25 | uint64_t atomic64_exchange(uint64_t *dst, uint64_t val)
         |          ^
   drivers/crypto/ccp/hygon/psp-dev.c:25:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      25 | uint64_t atomic64_exchange(uint64_t *dst, uint64_t val)
         | ^
         | static 
>> drivers/crypto/ccp/hygon/psp-dev.c:30:5: warning: no previous prototype for function 'psp_mutex_init' [-Wmissing-prototypes]
      30 | int psp_mutex_init(struct psp_mutex *mutex)
         |     ^
   drivers/crypto/ccp/hygon/psp-dev.c:30:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      30 | int psp_mutex_init(struct psp_mutex *mutex)
         | ^
         | static 
   drivers/crypto/ccp/hygon/psp-dev.c:38:5: warning: no previous prototype for function 'psp_mutex_trylock' [-Wmissing-prototypes]
      38 | int psp_mutex_trylock(struct psp_mutex *mutex)
         |     ^
   drivers/crypto/ccp/hygon/psp-dev.c:38:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      38 | int psp_mutex_trylock(struct psp_mutex *mutex)
         | ^
         | static 
   3 warnings generated.


vim +/atomic64_exchange +25 drivers/crypto/ccp/hygon/psp-dev.c

    24	
  > 25	uint64_t atomic64_exchange(uint64_t *dst, uint64_t val)
    26	{
    27		return xchg(dst, val);
    28	}
    29	
  > 30	int psp_mutex_init(struct psp_mutex *mutex)
    31	{
    32		if (!mutex)
    33			return -1;
    34		mutex->locked = 0;
    35		return 0;
    36	}
    37	

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