Re: [PATCH] staging: axis-fifo: initialize timeouts in probe only

From: Khadija Kamran
Date: Tue Mar 14 2023 - 10:08:44 EST

On Tue, Mar 14, 2023 at 11:45:51AM +0800, kernel test robot wrote:
> Hi Khadija,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on staging/staging-testing]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Khadija-Kamran/staging-axis-fifo-initialize-timeouts-in-probe-only/20230314-020827
> patch link: https://lore.kernel.org/r/ZA9mThZ7NyRrQAMX%40khadija-virtual-machine
> patch subject: [PATCH] staging: axis-fifo: initialize timeouts in probe only
> config: arm64-randconfig-r012-20230313 (https://download.01.org/0day-ci/archive/20230314/202303141159.6wN9HNP9-lkp@xxxxxxxxx/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
> 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/intel-lab-lkp/linux/commit/9d186f6c9f9bf467b48da3e28b0e9aa31fc3faf3
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Khadija-Kamran/staging-axis-fifo-initialize-timeouts-in-probe-only/20230314-020827
> git checkout 9d186f6c9f9bf467b48da3e28b0e9aa31fc3faf3
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/staging/axis-fifo/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Link: https://lore.kernel.org/oe-kbuild-all/202303141159.6wN9HNP9-lkp@xxxxxxxxx/
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/staging/axis-fifo/axis-fifo.c:817:18: warning: implicit conversion from 'long' to 'int' changes value from 9223372036854775807 to -1 [-Wconstant-conversion]
> read_timeout = MAX_SCHEDULE_TIMEOUT;
> ~ ^~~~~~~~~~~~~~~~~~~~
> include/linux/sched.h:296:31: note: expanded from macro 'MAX_SCHEDULE_TIMEOUT'
> #define MAX_SCHEDULE_TIMEOUT LONG_MAX
> ^~~~~~~~
> include/vdso/limits.h:11:19: note: expanded from macro 'LONG_MAX'
> #define LONG_MAX ((long)(~0UL >> 1))
> ^~~~~~~~~~~~~~~~~
> drivers/staging/axis-fifo/axis-fifo.c:822:19: warning: implicit conversion from 'long' to 'int' changes value from 9223372036854775807 to -1 [-Wconstant-conversion]
> write_timeout = MAX_SCHEDULE_TIMEOUT;
> ~ ^~~~~~~~~~~~~~~~~~~~
> include/linux/sched.h:296:31: note: expanded from macro 'MAX_SCHEDULE_TIMEOUT'
> #define MAX_SCHEDULE_TIMEOUT LONG_MAX
> ^~~~~~~~
> include/vdso/limits.h:11:19: note: expanded from macro 'LONG_MAX'
> #define LONG_MAX ((long)(~0UL >> 1))
> ^~~~~~~~~~~~~~~~~
> 2 warnings generated.
>

Hi everyone!
Kindly let me know if I should look into these warnings.
Thank you!

Regards,
Khadija


>
> vim +817 drivers/staging/axis-fifo/axis-fifo.c
>
> 805
> 806 static int axis_fifo_probe(struct platform_device *pdev)
> 807 {
> 808 struct resource *r_mem; /* IO mem resources */
> 809 struct device *dev = &pdev->dev; /* OS device (from device tree) */
> 810 struct axis_fifo *fifo = NULL;
> 811 char *device_name;
> 812 int rc = 0; /* error return value */
> 813
> 814 if (read_timeout >= 0)
> 815 read_timeout = msecs_to_jiffies(read_timeout);
> 816 else
> > 817 read_timeout = MAX_SCHEDULE_TIMEOUT;
> 818
> 819 if (write_timeout >= 0)
> 820 write_timeout = msecs_to_jiffies(write_timeout);
> 821 else
> 822 write_timeout = MAX_SCHEDULE_TIMEOUT;
> 823
> 824 /* ----------------------------
> 825 * init wrapper device
> 826 * ----------------------------
> 827 */
> 828
> 829 device_name = devm_kzalloc(dev, 32, GFP_KERNEL);
> 830 if (!device_name)
> 831 return -ENOMEM;
> 832
> 833 /* allocate device wrapper memory */
> 834 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL);
> 835 if (!fifo)
> 836 return -ENOMEM;
> 837
> 838 dev_set_drvdata(dev, fifo);
> 839 fifo->dt_device = dev;
> 840
> 841 init_waitqueue_head(&fifo->read_queue);
> 842 init_waitqueue_head(&fifo->write_queue);
> 843
> 844 mutex_init(&fifo->read_lock);
> 845 mutex_init(&fifo->write_lock);
> 846
> 847 /* ----------------------------
> 848 * init device memory space
> 849 * ----------------------------
> 850 */
> 851
> 852 /* get iospace for the device */
> 853 r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> 854 if (!r_mem) {
> 855 dev_err(fifo->dt_device, "invalid address\n");
> 856 rc = -ENODEV;
> 857 goto err_initial;
> 858 }
> 859
> 860 /* request physical memory */
> 861 fifo->base_addr = devm_ioremap_resource(fifo->dt_device, r_mem);
> 862 if (IS_ERR(fifo->base_addr)) {
> 863 rc = PTR_ERR(fifo->base_addr);
> 864 goto err_initial;
> 865 }
> 866
> 867 dev_dbg(fifo->dt_device, "remapped memory to 0x%p\n", fifo->base_addr);
> 868
> 869 /* create unique device name */
> 870 snprintf(device_name, 32, "%s_%pa", DRIVER_NAME, &r_mem->start);
> 871 dev_dbg(fifo->dt_device, "device name [%s]\n", device_name);
> 872
> 873 /* ----------------------------
> 874 * init IP
> 875 * ----------------------------
> 876 */
> 877
> 878 rc = axis_fifo_parse_dt(fifo);
> 879 if (rc)
> 880 goto err_initial;
> 881
> 882 reset_ip_core(fifo);
> 883
> 884 /* ----------------------------
> 885 * init device interrupts
> 886 * ----------------------------
> 887 */
> 888
> 889 /* get IRQ resource */
> 890 rc = platform_get_irq(pdev, 0);
> 891 if (rc < 0)
> 892 goto err_initial;
> 893
> 894 /* request IRQ */
> 895 fifo->irq = rc;
> 896 rc = devm_request_irq(fifo->dt_device, fifo->irq, &axis_fifo_irq, 0,
> 897 DRIVER_NAME, fifo);
> 898 if (rc) {
> 899 dev_err(fifo->dt_device, "couldn't allocate interrupt %i\n",
> 900 fifo->irq);
> 901 goto err_initial;
> 902 }
> 903
> 904 /* ----------------------------
> 905 * init char device
> 906 * ----------------------------
> 907 */
> 908
> 909 /* create character device */
> 910 fifo->miscdev.fops = &fops;
> 911 fifo->miscdev.minor = MISC_DYNAMIC_MINOR;
> 912 fifo->miscdev.name = device_name;
> 913 fifo->miscdev.groups = axis_fifo_attrs_groups;
> 914 fifo->miscdev.parent = dev;
> 915 rc = misc_register(&fifo->miscdev);
> 916 if (rc < 0)
> 917 goto err_initial;
> 918
> 919 dev_info(fifo->dt_device, "axis-fifo created at %pa mapped to 0x%pa, irq=%i\n",
> 920 &r_mem->start, &fifo->base_addr, fifo->irq);
> 921
> 922 return 0;
> 923
> 924 err_initial:
> 925 dev_set_drvdata(dev, NULL);
> 926 return rc;
> 927 }
> 928
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests