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Message-ID: <202404120417.VUAT9H5b-lkp@intel.com>
Date: Fri, 12 Apr 2024 04:11:17 +0800
From: kernel test robot <lkp@...el.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, virtualization@...ts.linux.dev
Cc: oe-kbuild-all@...ts.linux.dev, "Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH vhost 4/6] virtio_net: big mode support premapped
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@intel.com/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@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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404120417.VUAT9H5b-lkp@intel.com/
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
--
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