Hi Egil, [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Egil-Hjelmeland/net-dsa-lan9303-unicast-offload-fdb-mdb-STP/20170727-074246 config: x86_64-randconfig-x000-201730 (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=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/net//dsa/lan9303-core.c: In function 'lan9303_port_stp_state_set': >> drivers/net//dsa/lan9303-core.c:945:16: warning: 'portstate' may be used uninitialized in this function [-Wmaybe-uninitialized] int portmask, portstate; ^~~~~~~~~ vim +/portstate +945 drivers/net//dsa/lan9303-core.c 941 942 static void lan9303_port_stp_state_set(struct dsa_switch *ds, int port, 943 u8 state) 944 { > 945 int portmask, portstate; 946 struct lan9303 *chip = ds->priv; 947 948 dev_dbg(chip->dev, "%s(port %d, state %d)\n", 949 __func__, port, state); 950 if (!chip->is_bridged) 951 return; 952 953 switch (state) { 954 case BR_STATE_DISABLED: 955 portstate = LAN9303_SWE_PORT_STATE_DISABLED_PORT0; 956 break; 957 case BR_STATE_BLOCKING: 958 case BR_STATE_LISTENING: 959 portstate = LAN9303_SWE_PORT_STATE_BLOCKING_PORT0; 960 break; 961 case BR_STATE_LEARNING: 962 portstate = LAN9303_SWE_PORT_STATE_LEARNING_PORT0; 963 break; 964 case BR_STATE_FORWARDING: 965 portstate = LAN9303_SWE_PORT_STATE_FORWARDING_PORT0; 966 break; 967 default: 968 dev_err(chip->dev, "%s(port %d, state %d)\n", 969 __func__, port, state); 970 } 971 portmask = 0x3 << (port * 2); 972 portstate <<= (port * 2); 973 lan9303_write_switch_reg_mask(chip, LAN9303_SWE_PORT_STATE, 974 portstate, portmask); 975 } 976 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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