linux-kernel - [hyperv:hyperv-next 4/5] drivers/hv/vmbus_drv.c:2082:29: warning: shift count >= width of type

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Message-ID: <202112181827.o3X7GmHz-lkp@intel.com>
Date:   Sat, 18 Dec 2021 18:20:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Tianyu Lan <Tianyu.Lan@...rosoft.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Wei Liu <wei.liu@...nel.org>,
        Long Li <longli@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: [hyperv:hyperv-next 4/5] drivers/hv/vmbus_drv.c:2082:29: warning:
 shift count >= width of type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git hyperv-next
head:   19fd7ca00201c0525452dcf5a490e4b01674ef4c
commit: 6327882f7b4a476ea902de4bee5657f1028d6859 [4/5] scsi: storvsc: Add Isolation VM support for storvsc driver
config: x86_64-randconfig-a013-20211216 (https://download.01.org/0day-ci/archive/20211218/202112181827.o3X7GmHz-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4c9e31a4814592bbda7153833e46728dc7b21100)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/commit/?id=6327882f7b4a476ea902de4bee5657f1028d6859
        git remote add hyperv https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
        git fetch --no-tags hyperv hyperv-next
        git checkout 6327882f7b4a476ea902de4bee5657f1028d6859
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/hv/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/hv/vmbus_drv.c:2082:29: warning: shift count >= width of type [-Wshift-count-overflow]
   static u64 vmbus_dma_mask = DMA_BIT_MASK(64);
                               ^~~~~~~~~~~~~~~~
   include/linux/dma-mapping.h:76:54: note: expanded from macro 'DMA_BIT_MASK'
   #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
                                                        ^ ~~~
   1 warning generated.


vim +2082 drivers/hv/vmbus_drv.c

  2081	
> 2082	static u64 vmbus_dma_mask = DMA_BIT_MASK(64);
  2083	/*
  2084	 * vmbus_device_register - Register the child device
  2085	 */
  2086	int vmbus_device_register(struct hv_device *child_device_obj)
  2087	{
  2088		struct kobject *kobj = &child_device_obj->device.kobj;
  2089		int ret;
  2090	
  2091		dev_set_name(&child_device_obj->device, "%pUl",
  2092			     &child_device_obj->channel->offermsg.offer.if_instance);
  2093	
  2094		child_device_obj->device.bus = &hv_bus;
  2095		child_device_obj->device.parent = &hv_acpi_dev->dev;
  2096		child_device_obj->device.release = vmbus_device_release;
  2097	
  2098		/*
  2099		 * Register with the LDM. This will kick off the driver/device
  2100		 * binding...which will eventually call vmbus_match() and vmbus_probe()
  2101		 */
  2102		ret = device_register(&child_device_obj->device);
  2103		if (ret) {
  2104			pr_err("Unable to register child device\n");
  2105			return ret;
  2106		}
  2107	
  2108		child_device_obj->channels_kset = kset_create_and_add("channels",
  2109								      NULL, kobj);
  2110		if (!child_device_obj->channels_kset) {
  2111			ret = -ENOMEM;
  2112			goto err_dev_unregister;
  2113		}
  2114	
  2115		ret = vmbus_add_channel_kobj(child_device_obj,
  2116					     child_device_obj->channel);
  2117		if (ret) {
  2118			pr_err("Unable to register primary channeln");
  2119			goto err_kset_unregister;
  2120		}
  2121		hv_debug_add_dev_dir(child_device_obj);
  2122	
  2123		child_device_obj->device.dma_mask = &vmbus_dma_mask;
  2124		child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
  2125		return 0;
  2126	
  2127	err_kset_unregister:
  2128		kset_unregister(child_device_obj->channels_kset);
  2129	
  2130	err_dev_unregister:
  2131		device_unregister(&child_device_obj->device);
  2132		return ret;
  2133	}
  2134	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org