Hi Sergio, I love your patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] [also build test WARNING on clk/clk-next robh/for-next linus/master v5.11 next-20210216] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sergio-Paracuellos/MIPS-ralink-a... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 4eb839aef182fccf8995ee439fc2b48d43e45918 config: riscv-randconfig-r036-20210217 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/9b83f7b7032e26686ddc5d89e82ee2df4... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sergio-Paracuellos/MIPS-ralink-add-CPU-clock-detection-and-clock-driver-for-MT7621/20210217-194316 git checkout 9b83f7b7032e26686ddc5d89e82ee2df4dc260d3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (!clk_data) ^~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/ralink/clk-mt7621.c:517:9: note: uninitialized use occurs here return ret; ^~~ drivers/clk/ralink/clk-mt7621.c:459:2: note: remove the 'if' if its condition is always false if (!clk_data) ^~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/clk/ralink/clk-mt7621.c:451:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (IS_ERR(priv->memc)) { ^~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/ralink/clk-mt7621.c:517:9: note: uninitialized use occurs here return ret; ^~~ drivers/clk/ralink/clk-mt7621.c:451:2: note: remove the 'if' if its condition is always false if (IS_ERR(priv->memc)) { ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/clk/ralink/clk-mt7621.c:445:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (IS_ERR(priv->sysc)) { ^~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:28: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:58:30: note: expanded from macro '__trace_if_var' #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/clk/ralink/clk-mt7621.c:517:9: note: uninitialized use occurs here return ret; ^~~ drivers/clk/ralink/clk-mt7621.c:445:2: note: remove the 'if' if its condition is always false if (IS_ERR(priv->sysc)) { ^~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/clk/ralink/clk-mt7621.c:438:9: note: initialize the variable 'ret' to silence this warning int ret, i, count; ^ = 0 3 warnings generated. vim +459 drivers/clk/ralink/clk-mt7621.c 431 432 static int mt7621_clk_probe(struct platform_device *pdev) 433 { 434 struct device_node *np = pdev->dev.of_node; 435 struct clk_hw_onecell_data *clk_data; 436 struct device *dev = &pdev->dev; 437 struct mt7621_clk_priv *priv; 438 int ret, i, count; 439 440 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 441 if (!priv) 442 return -ENOMEM; 443 444 priv->sysc = syscon_regmap_lookup_by_phandle(np, "ralink,sysctl"); 445 if (IS_ERR(priv->sysc)) { 446 dev_err(dev, "Could not get sysc syscon regmap\n"); 447 goto free_clk_priv; 448 } 449 450 priv->memc = syscon_regmap_lookup_by_phandle(np, "ralink,memctl"); 451 if (IS_ERR(priv->memc)) { 452 dev_err(dev, "Could not get memc syscon regmap\n"); 453 goto free_clk_priv; 454 } 455 456 count = ARRAY_SIZE(mt7621_clks_base) + 457 ARRAY_SIZE(mt7621_fixed_clks) + ARRAY_SIZE(mt7621_gates); 458 clk_data = kzalloc(struct_size(clk_data, hws, count), GFP_KERNEL); 460 goto free_clk_priv; 461 462 for (i = 0; i < ARRAY_SIZE(mt7621_clks_base); i++) 463 clk_data->hws[i] = mt7621_clk_early[i]; 464 465 ret = mt7621_register_fixed_clocks(dev, clk_data); 466 if (ret) { 467 dev_err(dev, "Couldn't register fixed clocks\n"); 468 goto free_clk_data; 469 } 470 471 ret = mt7621_register_gates(dev, clk_data, priv); 472 if (ret) { 473 dev_err(dev, "Couldn't register fixed clock gates\n"); 474 goto unreg_clk_fixed; 475 } 476 477 clk_data->num = count; 478 479 ret = mt7621_prepare_enable_clocks(clk_data); 480 if (ret) { 481 dev_err(dev, "Couldn't register fixed clock gates\n"); 482 goto unreg_clk_gates; 483 } 484 485 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data); 486 if (ret) { 487 dev_err(dev, "Couldn't add clk hw provider\n"); 488 goto disable_clks; 489 } 490 491 return 0; 492 493 disable_clks: 494 for (i = 0; i < MT7621_CLK_MAX; i++) 495 clk_disable_unprepare(clk_data->hws[i]->clk); 496 497 unreg_clk_gates: 498 for (i = 0; i < ARRAY_SIZE(mt7621_gates); i++) { 499 struct mt7621_gate *sclk = &mt7621_gates[i]; 500 501 clk_hw_unregister(&sclk->hw); 502 } 503 504 unreg_clk_fixed: 505 for (i = 0; i < ARRAY_SIZE(mt7621_fixed_clks); i++) { 506 struct mt7621_fixed_clk *sclk = &mt7621_fixed_clks[i]; 507 508 clk_hw_unregister_fixed_rate(sclk->hw); 509 } 510 511 free_clk_data: 512 kfree(clk_data); 513 514 free_clk_priv: 515 kfree(priv); 516 517 return ret; 518 } 519 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org