[dhowells-fs:crypto-krb5 22/27] fs/afs/cm_security.c:48:undefined reference to `rxkad_kernel_respond_to_challenge'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git crypto-krb5
head:   eb2ef20c8f90912443f70e3cc46ddd4d4dea591f
commit: 6aad41326de842cc9aa4cd58fe8fb4018a5c3241 [22/27] rxrpc: Allow CHALLENGEs to the passed to the app for a RESPONSE
config: sparc-randconfig-002-20250210 (https://download.01.org/0day-ci/archive/20250210/202502101452.83heiFcl-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250210/202502101452.83heiFcl-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/202502101452.83heiFcl-lkp@intel.com/

All errors (new ones prefixed by >>):

   sparc64-linux-ld: fs/afs/cm_security.o: in function `afs_respond_to_challenge':
>> fs/afs/cm_security.c:48:(.text+0xbc): undefined reference to `rxkad_kernel_respond_to_challenge'


vim +48 fs/afs/cm_security.c

    14	
    15	/*
    16	 * Respond to an RxGK challenge, adding appdata.
    17	 */
    18	static int afs_respond_to_challenge(struct sk_buff *challenge)
    19	{
    20		struct rxrpc_peer *peer;
    21		unsigned long peer_data;
    22		u16 service_id;
    23		u8 security_index;
    24	
    25		rxrpc_kernel_query_challenge(challenge, &peer, &peer_data,
    26					     &service_id, &security_index);
    27	
    28		_enter("%u,%u", service_id, security_index);
    29	
    30		switch (service_id) {
    31			/* We don't send CM_SERVICE RPCs, so don't expect a challenge
    32			 * therefrom.
    33			 */
    34		case FS_SERVICE:
    35		case VL_SERVICE:
    36		case YFS_FS_SERVICE:
    37		case YFS_VL_SERVICE:
    38			break;
    39		default:
    40			pr_warn("Can't respond to unknown challenge %u:%u",
    41				service_id, security_index);
    42			return rxrpc_kernel_reject_challenge(challenge, RX_USER_ABORT, -EPROTO,
    43							     afs_abort_unsupported_sec_class);
    44		}
    45	
    46		switch (security_index) {
    47		case RXRPC_SECURITY_RXKAD:
  > 48			return rxkad_kernel_respond_to_challenge(challenge);
    49	
    50		default:
    51			return rxrpc_kernel_reject_challenge(challenge, RX_USER_ABORT, -EPROTO,
    52							     afs_abort_unsupported_sec_class);
    53		}
    54	}
    55	

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