Hi Nava, FYI, the error/warning still remains. tree: https://github.com/Xilinx/linux-xlnx release-2020.2.2_k26 head: 4731ff5042ce76fc145bc2797faa2d91b090675e commit: ed71785e2c3c3495e89c7b6c3a38699b59bf83d8 [9559/10480] fpga: support loading from a pre-allocated buffer config: um-randconfig-r002-20210419 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/Xilinx/linux-xlnx/commit/ed71785e2c3c3495e89c7b6c3a386... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx release-2020.2.2_k26 git checkout ed71785e2c3c3495e89c7b6c3a38699b59bf83d8 # save the attached .config to linux build tree make W=1 W=1 ARCH=um If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): cc1: warning: arch/um/include/uapi: No such file or directory [-Wmissing-include-dirs] In file included from include/linux/file.h:9, from include/linux/dma-buf.h:16, from drivers/fpga/fpga-mgr.c:11: include/asm-generic/fixmap.h: In function 'fix_to_virt': include/asm-generic/fixmap.h:32:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 32 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | ^~ include/linux/compiler.h:330:9: note: in definition of macro '__compiletime_assert' 330 | if (!(condition)) \ | ^~~~~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' 350 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) | ^~~~~~~~~~~~~~~~ include/asm-generic/fixmap.h:32:2: note: in expansion of macro 'BUILD_BUG_ON' 32 | BUILD_BUG_ON(idx >= __end_of_fixed_addresses); | ^~~~~~~~~~~~ drivers/fpga/fpga-mgr.c: In function 'fpga_mgr_create': 828 | set_dma_ops(&mgr->dev, get_dma_ops(dev)); | ^~~~~~~~~~~ 828 | set_dma_ops(&mgr->dev, get_dma_ops(dev)); | ^~~~~~~~~~~ | get_dma_buf cc1: some warnings being treated as errors vim +/set_dma_ops +828 drivers/fpga/fpga-mgr.c 773 774 /** 775 * fpga_mgr_create - create and initialize a FPGA manager struct 776 * @dev: fpga manager device from pdev 777 * @name: fpga manager name 778 * @mops: pointer to structure of fpga manager ops 779 * @priv: fpga manager private data 780 * 781 * The caller of this function is responsible for freeing the struct with 782 * fpga_mgr_free(). Using devm_fpga_mgr_create() instead is recommended. 783 * 784 * Return: pointer to struct fpga_manager or NULL 785 */ 786 struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name, 787 const struct fpga_manager_ops *mops, 788 void *priv) 789 { 790 struct fpga_manager *mgr; 791 int id, ret; 792 793 if (!mops || !mops->write_complete || !mops->state || 794 !mops->write_init || (!mops->write && !mops->write_sg)) { 795 dev_err(dev, "Attempt to register without fpga_manager_ops\n"); 796 return NULL; 797 } 798 799 if (!name || !strlen(name)) { 800 dev_err(dev, "Attempt to register with no name!\n"); 801 return NULL; 802 } 803 804 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 805 if (!mgr) 806 return NULL; 807 808 id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL); 809 if (id < 0) { 810 ret = id; 811 goto error_kfree; 812 } 813 814 mutex_init(&mgr->ref_mutex); 815 816 mgr->name = name; 817 mgr->mops = mops; 818 mgr->priv = priv; 819 820 device_initialize(&mgr->dev); 821 mgr->dev.class = fpga_mgr_class; 822 mgr->dev.groups = mops->groups; 823 mgr->dev.parent = dev; 824 mgr->dev.of_node = dev->of_node; 825 mgr->dev.id = id; 826 827 /* Make device dma capable by inheriting from parent's */ 829 ret = dma_coerce_mask_and_coherent(&mgr->dev, dma_get_mask(dev)); 830 if (ret) { 831 dev_warn(dev, 832 "Failed to set DMA mask %llx. Trying to continue... %x\n", 833 dma_get_mask(dev), ret); 834 } 835 836 ret = dev_set_name(&mgr->dev, "fpga%d", id); 837 if (ret) 838 goto error_device; 839 840 mgr->miscdev.minor = MISC_DYNAMIC_MINOR; 841 mgr->miscdev.name = kobject_name(&mgr->dev.kobj); 842 mgr->miscdev.fops = &fpga_fops; 843 ret = misc_register(&mgr->miscdev); 844 if (ret) { 845 pr_err("fpga: failed to register misc device.\n"); 846 goto error_device; 847 } 848 849 return mgr; 850 851 error_device: 852 ida_simple_remove(&fpga_mgr_ida, id); 853 error_kfree: 854 kfree(mgr); 855 856 return NULL; 857 } 858 EXPORT_SYMBOL_GPL(fpga_mgr_create); 859 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org