Hi Ben, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on linus/master v5.9-rc7 next-20200930] [cannot apply to xlnx/master linux/master] [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/Ben-Levinsky/Provide-basic-driver-to-control-Arm-R5-co-processor-found-on-Xilinx-ZynqMP/20200923-064055 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: arm64-randconfig-r005-20200930 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bcd05599d0e53977a963799d6ee4f6e0bc21331b) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/d3c4821ffb9b295e80f07fd712322efa657a95d9 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ben-Levinsky/Provide-basic-driver-to-control-Arm-R5-co-processor-found-on-Xilinx-ZynqMP/20200923-064055 git checkout d3c4821ffb9b295e80f07fd712322efa657a95d9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/remoteproc/zynqmp_r5_remoteproc.c:630:2: warning: variable 'dev' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (!pdata) { ^~~~~~~~~~~ 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/remoteproc/zynqmp_r5_remoteproc.c:686:20: note: uninitialized use occurs here device_unregister(dev); ^~~ drivers/remoteproc/zynqmp_r5_remoteproc.c:630:2: note: remove the 'if' if its condition is always false if (!pdata) { ^~~~~~~~~~~~~ include/linux/compiler.h:56:23: note: expanded from macro 'if' #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) ^ drivers/remoteproc/zynqmp_r5_remoteproc.c:625:20: note: initialize the variable 'dev' to silence this warning struct device *dev; ^ = NULL 1 warning generated. vim +630 drivers/remoteproc/zynqmp_r5_remoteproc.c 610 611 /** 612 * zynqmp_r5_probe() - Probes ZynqMP R5 processor device node 613 * @pdata: pointer to the ZynqMP R5 processor platform data 614 * @pdev: parent RPU domain platform device 615 * @node: pointer of the device node 616 * 617 * Function to retrieve the information of the ZynqMP R5 device node. 618 * 619 * Return: 0 for success, negative value for failure. 620 */ 621 static int zynqmp_r5_probe(struct zynqmp_r5_pdata *pdata, 622 struct platform_device *pdev, 623 struct device_node *node) 624 { 625 struct device *dev; 626 struct rproc *rproc; 627 int ret; 628 629 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); > 630 if (!pdata) { 631 ret = -ENOMEM; 632 goto error; 633 } 634 dev = &pdata->dev; 635 636 /* Create device for ZynqMP R5 device */ 637 dev->parent = &pdev->dev; 638 dev->release = zynqmp_r5_release; 639 dev->of_node = node; 640 dev_set_name(dev, "%pOF", node); 641 dev_set_drvdata(dev, pdata); 642 ret = device_register(dev); 643 if (ret) 644 goto error; 645 646 /* Allocate remoteproc instance */ 647 rproc = rproc_alloc(dev, dev_name(dev), &zynqmp_r5_rproc_ops, NULL, sizeof(*pdata)); 648 if (!rproc) { 649 ret = -ENOMEM; 650 goto error; 651 } 652 pdata->rproc = rproc; 653 rproc->priv = pdata; 654 655 /* Set up DMA mask */ 656 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 657 if (ret) 658 goto error; 659 660 /* Get R5 power domain node */ 661 ret = of_property_read_u32(node, "pnode-id", &pdata->pnode_id); 662 if (ret) 663 goto error; 664 665 ret = r5_set_mode(pdata); 666 if (ret) 667 goto error; 668 669 if (of_property_read_bool(node, "mboxes")) { 670 ret = zynqmp_r5_setup_mbox(pdata, node); 671 if (ret) 672 goto error; 673 } 674 675 /* Add R5 remoteproc */ 676 ret = rproc_add(rproc); 677 if (ret) 678 goto error; 679 680 platform_set_drvdata(pdev, rproc); 681 return 0; 682 error: 683 if (pdata->rproc) 684 rproc_free(pdata->rproc); 685 pdata->rproc = NULL; 686 device_unregister(dev); 687 return ret; 688 } 689 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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