Re: [PATCH v2 1/2] vhost-vdpa: introduce module parameter for no-IOMMU mode

kernel test robot
2024-09-21T17:29:00Z

Hi Srujana,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.11 next-20240920]
[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/Srujana-Challa/vhost-vdpa-introduce-module-parameter-for-no-IOMMU-mode/20240920-220751
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20240920140530.775307-2-schalla%40marvell.com
patch subject: [PATCH v2 1/2] vhost-vdpa: introduce module parameter for no-IOMMU mode
config: x86_64-randconfig-122-20240921 (https://download.01.org/0day-ci/archive/20240922/202409220134.x63FmsHx-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240922/202409220134.x63FmsHx-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/202409220134.x63FmsHx-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/vhost/vdpa.c:39:6: sparse: sparse: symbol 'vhost_vdpa_noiommu' was not declared. Should it be static?

vim +/vhost_vdpa_noiommu +39 drivers/vhost/vdpa.c

38
> 39 bool vhost_vdpa_noiommu;
40 module_param_named(enable_vhost_vdpa_unsafe_noiommu_mode,
41 vhost_vdpa_noiommu, bool, 0644);
42 MODULE_PARM_DESC(enable_vhost_vdpa_unsafe_noiommu_mode, "Enable UNSAFE, no-IOMMU mode. This mode provides no device isolation, no DMA translation, no host kernel protection, cannot be used for device assignment to virtual machines, requires RAWIO permissions, and will taint the kernel. If you do not know what this is for, step away. (default: false)");
43

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