[openeuler:OLK-6.6 2411/2411] drivers/crypto/ccp/hygon/psp-dev.c:25:10: warning: no previous prototype for 'atomic64_exchange'

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   c02455c4cce8052f74fc11c09e9073c01c7f33a4
commit: fe08767e3a083e73a72f08432bc6fbd864fa7179 [2411/2411] drivers/crypto/ccp: concurrent psp access support between user and kernel space
config: x86_64-buildonly-randconfig-2001-20250626 (https://download.01.org/0day-ci/archive/20250629/202506291256.D2SqWOXZ-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250629/202506291256.D2SqWOXZ-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/202506291256.D2SqWOXZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/crypto/ccp/hygon/psp-dev.c:25:10: warning: no previous prototype for 'atomic64_exchange' [-Wmissing-prototypes]
      25 | uint64_t atomic64_exchange(uint64_t *dst, uint64_t val)
         |          ^~~~~~~~~~~~~~~~~
>> drivers/crypto/ccp/hygon/psp-dev.c:30:5: warning: no previous prototype for 'psp_mutex_init' [-Wmissing-prototypes]
      30 | int psp_mutex_init(struct psp_mutex *mutex)
         |     ^~~~~~~~~~~~~~
   drivers/crypto/ccp/hygon/psp-dev.c:38:5: warning: no previous prototype for 'psp_mutex_trylock' [-Wmissing-prototypes]
      38 | int psp_mutex_trylock(struct psp_mutex *mutex)
         |     ^~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for ACPI_HOTPLUG_IGNORE_OSC
   Depends on [n]: ACPI [=y] && ACPI_HOTPLUG_CPU [=n]
   Selected by [y]:
   - X86 [=y] && ACPI [=y] && HOTPLUG_CPU [=y]


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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