Hi Miaoqing, [auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore] config: tile-allyesconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 220286596260e48c3c25675309d3c7d4f0875198 # save the attached .config to linux build tree make.cross ARCH=tile 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/wireless/ath/ath9k/rng.c: In function 'ath9k_rng_data_read.constprop.0': >> drivers/net/wireless/ath/ath9k/rng.c:53:15: warning: 'v2' may be used uninitialized in this function [-Wuninitialized] vim +/v2 +53 drivers/net/wireless/ath/ath9k/rng.c 37 REG_RMW_FIELD(ah, AR_PHY_TEST_CTL_STATUS, AR_PHY_TEST_CTL_RX_OBS_SEL, 0); 38 39 for (i = 0, j = 0; i < buf_size; i++) { 40 v1 = REG_READ(ah, AR_PHY_TST_ADC) & 0xffff; 41 v2 = REG_READ(ah, AR_PHY_TST_ADC) & 0xffff; 42 43 /* wait for data ready */ 44 if (v1 && v2 && rng_last != v1 && v1 != v2 && v1 != 0xffff && 45 v2 != 0xffff) 46 buf[j++] = (v1 << 16) | v2; 47 48 rng_last = v2; 49 } 50 51 ath9k_ps_restore(sc); 52 > 53 sc->rng_last = v2; 54 55 return j << 2; 56 } 57 58 static int ath9k_rng_kthread(void *data) 59 { 60 int bytes_read; 61 struct ath_softc *sc = data; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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