tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 92e963f50fc74041b5e9e744c330dca48e04f08d commit: c6d308534aef6c99904bf5862066360ae067abc4 UBSAN: run-time undefined behavior sanity checker date: 4 days ago config: x86_64-randconfig-n0-01251456 (attached as .config) reproduce: git checkout c6d308534aef6c99904bf5862066360ae067abc4 # 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 >>): sound/soc/codecs/wm8962.c: In function 'wm8962_set_fll': >> sound/soc/codecs/wm8962.c:2790:32: warning: 'fratio' may be used >> uninitialized in this function [-Wmaybe-uninitialized] fll_div->n = target / (fratio * Fref); ^ sound/soc/codecs/wm8962.c:2740:15: note: 'fratio' was declared here unsigned int fratio, gcd_fll; ^ vim +/fratio +2790 sound/soc/codecs/wm8962.c 9a76f1ff Mark Brown 2010-08-05 2774 9a76f1ff Mark Brown 2010-08-05 2775 pr_debug("FLL Fvco=%dHz\n", target); 9a76f1ff Mark Brown 2010-08-05 2776 25985edc Lucas De Marchi 2011-03-30 2777 /* Find an appropriate FLL_FRATIO and factor it out of the target */ 9a76f1ff Mark Brown 2010-08-05 2778 for (i = 0; i < ARRAY_SIZE(fll_fratios); i++) { 9a76f1ff Mark Brown 2010-08-05 2779 if (fll_fratios[i].min <= Fref && Fref <= fll_fratios[i].max) { 9a76f1ff Mark Brown 2010-08-05 2780 fll_div->fll_fratio = fll_fratios[i].fll_fratio; 9a76f1ff Mark Brown 2010-08-05 2781 fratio = fll_fratios[i].ratio; 9a76f1ff Mark Brown 2010-08-05 2782 break; 9a76f1ff Mark Brown 2010-08-05 2783 } 9a76f1ff Mark Brown 2010-08-05 2784 } 9a76f1ff Mark Brown 2010-08-05 2785 if (i == ARRAY_SIZE(fll_fratios)) { 9a76f1ff Mark Brown 2010-08-05 2786 pr_err("Unable to find FLL_FRATIO for Fref=%uHz\n", Fref); 9a76f1ff Mark Brown 2010-08-05 2787 return -EINVAL; 9a76f1ff Mark Brown 2010-08-05 2788 } 9a76f1ff Mark Brown 2010-08-05 2789 9a76f1ff Mark Brown 2010-08-05 @2790 fll_div->n = target / (fratio * Fref); 9a76f1ff Mark Brown 2010-08-05 2791 9a76f1ff Mark Brown 2010-08-05 2792 if (target % Fref == 0) { 9a76f1ff Mark Brown 2010-08-05 2793 fll_div->theta = 0; 9a76f1ff Mark Brown 2010-08-05 2794 fll_div->lambda = 0; 9a76f1ff Mark Brown 2010-08-05 2795 } else { 9a76f1ff Mark Brown 2010-08-05 2796 gcd_fll = gcd(target, fratio * Fref); 9a76f1ff Mark Brown 2010-08-05 2797 9a76f1ff Mark Brown 2010-08-05 2798 fll_div->theta = (target - (fll_div->n * fratio * Fref)) :::::: The code at line 2790 was first introduced by commit :::::: 9a76f1ff6e299fbb04149fe15aff061351fd0dab ASoC: Add initial WM8962 CODEC driver :::::: TO: Mark Brown <[email protected]> :::::: CC: Mark Brown <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
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