Re: [PATCH vhost v1 4/7] virtio_net: big mode support premapped

[kernel test robot <lkp@intel.com>]

Hi Xuan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.9-rc5 next-20240419]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Xuan-Zhuo/virtio_ring-introduce-dma-map-api-for-page/20240422-101017
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link:    https://lore.kernel.org/r/20240422015403.72526-5-xuanzhuo%40linux.alibaba.com
patch subject: [PATCH vhost v1 4/7] virtio_net: big mode support premapped
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20240422/202404221325.SX5ChRGP-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240422/202404221325.SX5ChRGP-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404221325.SX5ChRGP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/virtio_net.c: In function 'page_chain_get_dma':
>> drivers/net/virtio_net.c:468:30: warning: left shift count >= width of type [-Wshift-count-overflow]
     468 |                 return (addr << 32) + p->dma_addr;
         |                              ^~


vim +468 drivers/net/virtio_net.c

   461	
   462	static dma_addr_t page_chain_get_dma(struct page *p)
   463	{
   464		dma_addr_t addr;
   465	
   466		if (sizeof(dma_addr_t) > sizeof(unsigned long)) {
   467			addr = p->pp_magic;
 > 468			return (addr << 32) + p->dma_addr;
   469		} else {
   470			return p->dma_addr;
   471		}
   472	}
   473	

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