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Use empty inline functions instead of empty #define. Fix for "unused variable" as reported below: tree: git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next.git master head:167bf96dd8commit:871d8c4bbb[45/62] wil6210: fix usage of print_hex_dump_debug config: i386-allyesconfig reproduce: git checkout871d8c4bbbmake ARCH=i386 allyesconfig make ARCH=i386 All warnings: drivers/net/wireless/ath/wil6210/wmi.c: In function 'wmi_evt_rx_mgmt': >> drivers/net/wireless/ath/wil6210/wmi.c:341:10: warning: unused variable 'ie_len' [-Wunused-variable] size_t ie_len = d_len - offsetof(struct ieee80211_mgmt, ^ >> drivers/net/wireless/ath/wil6210/wmi.c:340:13: warning: unused variable 'ie_buf' [-Wunused-variable] const u8 *ie_buf = rx_mgmt_frame->u.beacon.variable; ^ vim +/ie_len +341 drivers/net/wireless/ath/wil6210/wmi.c2be7d22fVladimir Kondratiev 2012-12-20 3342be7d22fVladimir Kondratiev 2012-12-20 335 if (ieee80211_is_beacon(fc) || ieee80211_is_probe_resp(fc)) {2be7d22fVladimir Kondratiev 2012-12-20 336 struct cfg80211_bss *bss;8eea944aVladimir Kondratiev 2014-06-16 337 u64 tsf = le64_to_cpu(rx_mgmt_frame->u.beacon.timestamp);8eea944aVladimir Kondratiev 2014-06-16 338 u16 cap = le16_to_cpu(rx_mgmt_frame->u.beacon.capab_info);8eea944aVladimir Kondratiev 2014-06-16 339 u16 bi = le16_to_cpu(rx_mgmt_frame->u.beacon.beacon_int);8eea944aVladimir Kondratiev 2014-06-16 340 const u8 *ie_buf = rx_mgmt_frame->u.beacon.variable;8eea944aVladimir Kondratiev 2014-06-16 341 size_t ie_len = d_len - offsetof(struct ieee80211_mgmt,8eea944aVladimir Kondratiev 2014-06-16 342 u.beacon.variable);8eea944aVladimir Kondratiev 2014-06-16 343 wil_dbg_wmi(wil, "Capability info : 0x%04x\n", cap);8eea944aVladimir Kondratiev 2014-06-16 344 wil_dbg_wmi(wil, "TSF : 0x%016llx\n", tsf); :::::: The code at line 341 was first introduced by commit ::::::8eea944af0wil6210: print more info about BSS found Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>