Hi Vivien,

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Vivien-Didelot/net-dsa-restore-HWMON-support-in-dsa2/20170104-055351
config: i386-randconfig-x005-201701 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from net/dsa/dsa.c:26:0:
>> net/dsa/dsa_priv.h:61:5: warning: "CONFIG_NET_DSA_HWMON" is not defined [-Wundef]
    #if CONFIG_NET_DSA_HWMON
        ^~~~~~~~~~~~~~~~~~~~

vim +/CONFIG_NET_DSA_HWMON +61 net/dsa/dsa_priv.h

    45		struct net_device	*bridge_dev;
    46	#ifdef CONFIG_NET_POLL_CONTROLLER
    47		struct netpoll		*netpoll;
    48	#endif
    49	};
    50	
    51	/* dsa.c */
    52	extern char dsa_driver_version[];
    53	int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
    54			      struct device_node *port_dn, int port);
    55	void dsa_cpu_dsa_destroy(struct device_node *port_dn);
    56	const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol);
    57	int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds);
    58	void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds);
    59	
    60	/* hwmon.c */
  > 61	#if CONFIG_NET_DSA_HWMON
    62	void dsa_hwmon_register(struct dsa_switch *ds);
    63	void dsa_hwmon_unregister(struct dsa_switch *ds);
    64	#else
    65	static inline void dsa_hwmon_register(struct dsa_switch *ds) { }
    66	static inline void dsa_hwmon_unregister(struct dsa_switch *ds) { }
    67	#endif
    68	
    69	/* slave.c */

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