tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 39750fe2d360d6f1ccdc6b33d0a5cb624c97a5fd commit: df423af30988b62df3905601742b8948bbbce329 [11446/11650] UBSAN: run-time undefined behavior sanity checker config: x86_64-randconfig-s5-01151613 (attached as .config) reproduce: git checkout df423af30988b62df3905601742b8948bbbce329 # 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/pwm/pwm-atmel-hlcdc.c: In function 'atmel_hlcdc_pwm_config': >> drivers/pwm/pwm-atmel-hlcdc.c:75:55: warning: 'clk_period_ns' may be used uninitialized in this function [-Wmaybe-uninitialized] if ((chip->errata && chip->errata->slow_clk_erratum) || ^ vim +/clk_period_ns +75 drivers/pwm/pwm-atmel-hlcdc.c 2b4984be Boris Brezillon 2014-10-07 59 u64 pwmcval = duty_ns * 256; 2b4984be Boris Brezillon 2014-10-07 60 unsigned long clk_freq; 2b4984be Boris Brezillon 2014-10-07 61 u64 clk_period_ns; 2b4984be Boris Brezillon 2014-10-07 62 u32 pwmcfg; 2b4984be Boris Brezillon 2014-10-07 63 int pres; 2b4984be Boris Brezillon 2014-10-07 64 39e046f2 Boris BREZILLON 2014-11-19 65 if (!chip->errata || !chip->errata->slow_clk_erratum) { 2b4984be Boris Brezillon 2014-10-07 66 clk_freq = clk_get_rate(new_clk); df6922ad Boris BREZILLON 2014-12-18 67 if (!clk_freq) df6922ad Boris BREZILLON 2014-12-18 68 return -EINVAL; df6922ad Boris BREZILLON 2014-12-18 69 2b4984be Boris Brezillon 2014-10-07 70 clk_period_ns = (u64)NSEC_PER_SEC * 256; 2b4984be Boris Brezillon 2014-10-07 71 do_div(clk_period_ns, clk_freq); 39e046f2 Boris BREZILLON 2014-11-19 72 } 2b4984be Boris Brezillon 2014-10-07 73 39e046f2 Boris BREZILLON 2014-11-19 74 /* Errata: cannot use slow clk on some IP revisions */ 39e046f2 Boris BREZILLON 2014-11-19 @75 if ((chip->errata && chip->errata->slow_clk_erratum) || 39e046f2 Boris BREZILLON 2014-11-19 76 clk_period_ns > period_ns) { 2b4984be Boris Brezillon 2014-10-07 77 new_clk = hlcdc->sys_clk; 2b4984be Boris Brezillon 2014-10-07 78 clk_freq = clk_get_rate(new_clk); df6922ad Boris BREZILLON 2014-12-18 79 if (!clk_freq) df6922ad Boris BREZILLON 2014-12-18 80 return -EINVAL; df6922ad Boris BREZILLON 2014-12-18 81 2b4984be Boris Brezillon 2014-10-07 82 clk_period_ns = (u64)NSEC_PER_SEC * 256; 2b4984be Boris Brezillon 2014-10-07 83 do_div(clk_period_ns, clk_freq); :::::: The code at line 75 was first introduced by commit :::::: 39e046f2c1dd0742976d7ee6e464744cf2122f41 pwm: atmel-hlcdc: add at91sam9x5 and sama5d3 errata handling :::::: TO: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx> :::::: CC: Thierry Reding <thierry.reding@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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