[jlayton:exportd-netlink 3/3] fs/nfsd/export.c:381:7: error: call to undeclared function 'genl_has_listeners'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git exportd-netlink
head:   aef82be579c01a1995f0e0c98313f23e7e4893a0
commit: aef82be579c01a1995f0e0c98313f23e7e4893a0 [3/3] nfsd: send nl_notfiy when a svc_export upcall is queued
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260207/202602071212.A5drOLFI-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260207/202602071212.A5drOLFI-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/202602071212.A5drOLFI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/nfsd/export.c:381:7: error: call to undeclared function 'genl_has_listeners'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     381 |         if (!genl_has_listeners(&exportd_nl_family, cd->net, EXPORTD_NLGRP_EXPORTD))
         |              ^
   fs/nfsd/export.c:381:7: note: did you mean 'rtnl_has_listeners'?
   include/linux/rtnetlink.h:221:19: note: 'rtnl_has_listeners' declared here
     221 | static inline int rtnl_has_listeners(const struct net *net, u32 group)
         |                   ^
>> fs/nfsd/export.c:381:27: error: use of undeclared identifier 'exportd_nl_family'
     381 |         if (!genl_has_listeners(&exportd_nl_family, cd->net, EXPORTD_NLGRP_EXPORTD))
         |                                  ^
>> fs/nfsd/export.c:381:55: error: use of undeclared identifier 'EXPORTD_NLGRP_EXPORTD'
     381 |         if (!genl_has_listeners(&exportd_nl_family, cd->net, EXPORTD_NLGRP_EXPORTD))
         |                                                              ^
>> fs/nfsd/export.c:384:8: error: call to undeclared function 'genlmsg_new'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     384 |         msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, flags);
         |               ^
   fs/nfsd/export.c:384:8: note: did you mean 'nlmsg_new'?
   include/net/netlink.h:1053:31: note: 'nlmsg_new' declared here
    1053 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
         |                               ^
>> fs/nfsd/export.c:384:20: error: use of undeclared identifier 'GENLMSG_DEFAULT_SIZE'
     384 |         msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, flags);
         |                           ^
>> fs/nfsd/export.c:384:42: error: use of undeclared identifier 'flags'
     384 |         msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, flags);
         |                                                 ^
   6 errors generated.


vim +/genl_has_listeners +381 fs/nfsd/export.c

   376	
   377	static int svc_export_genl_notify(struct cache_detail *cd, struct cache_head *h)
   378	{
   379		struct sk_buff *msg;
   380	
 > 381		if (!genl_has_listeners(&exportd_nl_family, cd->net, EXPORTD_NLGRP_EXPORTD))
   382			return -ESRCH;
   383	
 > 384		msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, flags);
   385		if (!msg)
   386			return -ENOMEM;
   387	

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