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X-CSE-ConnectionGUID: YxCC4PNVR+GJMiKE2XiJ+w== X-CSE-MsgGUID: VmEZot+QTwaYVAmb8ucQKA== X-IronPort-AV: E=McAfee;i="6800,10657,11703"; a="72451818" X-IronPort-AV: E=Sophos;i="6.21,295,1763452800"; d="scan'208";a="72451818" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2026 14:02:37 -0800 X-CSE-ConnectionGUID: VCnj5pLTStmFhsg4kyMrQw== X-CSE-MsgGUID: bvLXDQ6DRKiRmHFRPKyMrQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,295,1763452800"; d="scan'208";a="218241812" Received: from lkp-server01.sh.intel.com (HELO 765f4a05e27f) ([10.239.97.150]) by fmviesa005.fm.intel.com with ESMTP; 16 Feb 2026 14:02:35 -0800 Received: from kbuild by 765f4a05e27f with local (Exim 4.98.2) (envelope-from ) id 1vs6fp-000000010Jk-1QzW; Mon, 16 Feb 2026 22:02:33 +0000 Date: Tue, 17 Feb 2026 06:02:13 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: drivers/xen/grant-dma-ops.c:174 xen_grant_dma_map_phys() warn: mask and shift to zero: expr='offset >> 12' Message-ID: <202602170520.TSeikPfm-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Leon Romanovsky CC: Marek Szyprowski CC: Jason Gunthorpe tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0f2acd3148e0ef42bdacbd477f90e8533f96b2ac commit: 936a9f0cb16b0646143f8e05afab458adc51d0a0 xen: swiotlb: Convert mapping routine to rely on physical address date: 4 months ago :::::: branch date: 18 hours ago :::::: commit date: 4 months ago config: arm-randconfig-r072-20260217 (https://download.01.org/0day-ci/archive/20260217/202602170520.TSeikPfm-lkp@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 10.5.0 smatch version: v0.5.0-8994-gd50c5a4c 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202602170520.TSeikPfm-lkp@intel.com/ smatch warnings: drivers/xen/grant-dma-ops.c:174 xen_grant_dma_map_phys() warn: mask and shift to zero: expr='offset >> 12' vim +174 drivers/xen/grant-dma-ops.c d6aca3504c7ded Juergen Gross 2022-06-02 165 936a9f0cb16b06 Leon Romanovsky 2025-10-15 166 static dma_addr_t xen_grant_dma_map_phys(struct device *dev, phys_addr_t phys, 936a9f0cb16b06 Leon Romanovsky 2025-10-15 167 size_t size, d6aca3504c7ded Juergen Gross 2022-06-02 168 enum dma_data_direction dir, d6aca3504c7ded Juergen Gross 2022-06-02 169 unsigned long attrs) d6aca3504c7ded Juergen Gross 2022-06-02 170 { d6aca3504c7ded Juergen Gross 2022-06-02 171 struct xen_grant_dma_data *data; 936a9f0cb16b06 Leon Romanovsky 2025-10-15 172 unsigned long offset = offset_in_page(phys); a383dcb1cca830 Oleksandr Tyshchenko 2022-10-08 173 unsigned long dma_offset = xen_offset_in_page(offset), a383dcb1cca830 Oleksandr Tyshchenko 2022-10-08 @174 pfn_offset = XEN_PFN_DOWN(offset); a383dcb1cca830 Oleksandr Tyshchenko 2022-10-08 175 unsigned int i, n_pages = XEN_PFN_UP(dma_offset + size); d6aca3504c7ded Juergen Gross 2022-06-02 176 grant_ref_t grant; d6aca3504c7ded Juergen Gross 2022-06-02 177 dma_addr_t dma_handle; d6aca3504c7ded Juergen Gross 2022-06-02 178 936a9f0cb16b06 Leon Romanovsky 2025-10-15 179 if (unlikely(attrs & DMA_ATTR_MMIO)) 936a9f0cb16b06 Leon Romanovsky 2025-10-15 180 return DMA_MAPPING_ERROR; 936a9f0cb16b06 Leon Romanovsky 2025-10-15 181 d6aca3504c7ded Juergen Gross 2022-06-02 182 if (WARN_ON(dir == DMA_NONE)) d6aca3504c7ded Juergen Gross 2022-06-02 183 return DMA_MAPPING_ERROR; d6aca3504c7ded Juergen Gross 2022-06-02 184 d6aca3504c7ded Juergen Gross 2022-06-02 185 data = find_xen_grant_dma_data(dev); d6aca3504c7ded Juergen Gross 2022-06-02 186 if (!data) d6aca3504c7ded Juergen Gross 2022-06-02 187 return DMA_MAPPING_ERROR; d6aca3504c7ded Juergen Gross 2022-06-02 188 d6aca3504c7ded Juergen Gross 2022-06-02 189 if (unlikely(data->broken)) d6aca3504c7ded Juergen Gross 2022-06-02 190 return DMA_MAPPING_ERROR; d6aca3504c7ded Juergen Gross 2022-06-02 191 d6aca3504c7ded Juergen Gross 2022-06-02 192 if (gnttab_alloc_grant_reference_seq(n_pages, &grant)) d6aca3504c7ded Juergen Gross 2022-06-02 193 return DMA_MAPPING_ERROR; d6aca3504c7ded Juergen Gross 2022-06-02 194 d6aca3504c7ded Juergen Gross 2022-06-02 195 for (i = 0; i < n_pages; i++) { d6aca3504c7ded Juergen Gross 2022-06-02 196 gnttab_grant_foreign_access_ref(grant + i, data->backend_domid, 936a9f0cb16b06 Leon Romanovsky 2025-10-15 197 pfn_to_gfn(page_to_xen_pfn(phys_to_page(phys)) + i + pfn_offset), 875553e317b28e Oleksandr Tyshchenko 2022-10-08 198 dir == DMA_TO_DEVICE); d6aca3504c7ded Juergen Gross 2022-06-02 199 } d6aca3504c7ded Juergen Gross 2022-06-02 200 875553e317b28e Oleksandr Tyshchenko 2022-10-08 201 dma_handle = grant_to_dma(grant) + dma_offset; d6aca3504c7ded Juergen Gross 2022-06-02 202 d6aca3504c7ded Juergen Gross 2022-06-02 203 return dma_handle; d6aca3504c7ded Juergen Gross 2022-06-02 204 } d6aca3504c7ded Juergen Gross 2022-06-02 205 :::::: The code at line 174 was first introduced by commit :::::: a383dcb1cca8305497877119fba0a320f41fe853 xen/virtio: Convert PAGE_SIZE/PAGE_SHIFT/PFN_UP to Xen counterparts :::::: TO: Oleksandr Tyshchenko :::::: CC: Juergen Gross -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki