[linux-next:master 10123/10830] include/linux/dpll.h:179:1: warning: control reaches end of non-void function

[linux-next:master 10123/10830] include/linux/dpll.h:179:1: warning: control reaches end of non-void function

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   20af1ca418d2c0b11bc2a1fe8c0c88f67bcc2a7e
commit: 0d60d8df6f493bb46bf5db40d39dd60a1bafdd4e [10123/10830] dpll: rely on rcu for netdev_dpll_pin()
config: i386-randconfig-141-20240228 (https://download.01.org/0day-ci/archive/20240229/202402290000.tX1Ed1x7-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240229/202402290000.tX1Ed1x7-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/202402290000.tX1Ed1x7-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/rbtree.h:24:0,
                    from include/linux/mm_types.h:11,
                    from include/linux/mmzone.h:22,
                    from include/linux/gfp.h:7,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:17,
                    from net/core/rtnetlink.c:17:
   include/linux/dpll.h: In function 'netdev_dpll_pin':
   include/linux/rcupdate.h:439:9: error: dereferencing pointer to incomplete type 'struct dpll_pin'
     typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
            ^
   include/linux/rcupdate.h:587:2: note: in expansion of macro '__rcu_dereference_check'
     __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
     ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rtnetlink.h:70:2: note: in expansion of macro 'rcu_dereference_check'
     rcu_dereference_check(p, lockdep_rtnl_is_held())
     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/dpll.h:175:9: note: in expansion of macro 'rcu_dereference_rtnl'
     return rcu_dereference_rtnl(dev->dpll_pin);
            ^~~~~~~~~~~~~~~~~~~~
   In file included from net/core/rtnetlink.c:60:0:
>> include/linux/dpll.h:179:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^


vim +179 include/linux/dpll.h

   171	
   172	static inline struct dpll_pin *netdev_dpll_pin(const struct net_device *dev)
   173	{
   174	#if IS_ENABLED(CONFIG_DPLL)
   175		return rcu_dereference_rtnl(dev->dpll_pin);
   176	#else
   177		return NULL;
   178	#endif
 > 179	}
   180	

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