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-rc3 next-20240411] [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/20240411-105318 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next patch link: https://lore.kernel.org/r/20240411025127.51945-5-xuanzhuo%40linux.alibaba.com patch subject: [PATCH vhost 4/6] virtio_net: big mode support premapped config: i386-randconfig-062-20240411 (https://download.01.org/0day-ci/archive/20240412/202404120417.VUAT9H5b-lkp@xxxxxxxxx/config) compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240412/202404120417.VUAT9H5b-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202404120417.VUAT9H5b-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/linux/skbuff.h:28, from include/net/net_namespace.h:43, from include/linux/netdevice.h:38, from drivers/net/virtio_net.c:7: drivers/net/virtio_net.c: In function 'page_chain_unmap': >> include/linux/dma-mapping.h:75:41: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow] 75 | #define DMA_MAPPING_ERROR (~(dma_addr_t)0) | ^ drivers/net/virtio_net.c:449:28: note: in expansion of macro 'DMA_MAPPING_ERROR' 449 | page_dma_addr(p) = DMA_MAPPING_ERROR; | ^~~~~~~~~~~~~~~~~ vim +75 include/linux/dma-mapping.h b2fb366425ceb8 Mitchel Humpherys 2017-01-06 64 eba304c6861613 Christoph Hellwig 2020-09-11 65 /* eba304c6861613 Christoph Hellwig 2020-09-11 66 * A dma_addr_t can hold any valid DMA or bus address for the platform. It can eba304c6861613 Christoph Hellwig 2020-09-11 67 * be given to a device to use as a DMA source or target. It is specific to a eba304c6861613 Christoph Hellwig 2020-09-11 68 * given device and there may be a translation between the CPU physical address eba304c6861613 Christoph Hellwig 2020-09-11 69 * space and the bus address space. eba304c6861613 Christoph Hellwig 2020-09-11 70 * eba304c6861613 Christoph Hellwig 2020-09-11 71 * DMA_MAPPING_ERROR is the magic error code if a mapping failed. It should not eba304c6861613 Christoph Hellwig 2020-09-11 72 * be used directly in drivers, but checked for using dma_mapping_error() eba304c6861613 Christoph Hellwig 2020-09-11 73 * instead. eba304c6861613 Christoph Hellwig 2020-09-11 74 */ 42ee3cae0ed38b Christoph Hellwig 2018-11-21 @75 #define DMA_MAPPING_ERROR (~(dma_addr_t)0) 42ee3cae0ed38b Christoph Hellwig 2018-11-21 76 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
