Hi, kernel test robot noticed the following build warnings: [auto build test WARNING on media-tree/master] [also build test WARNING on sailus-media-tree/master linuxtv-media-stage/master linus/master v6.11-rc3 next-20240815] [cannot apply to sailus-media-tree/streams] [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/bingbu-cao-intel-com/media-intel-ipu6-optimize-the-IPU6-MMU-mapping-and-unmapping-flow/20240815-111022 base: git://linuxtv.org/media_tree.git master patch link: https://lore.kernel.org/r/20240815030829.1608953-1-bingbu.cao%40intel.com patch subject: [PATCH] media: intel/ipu6: optimize the IPU6 MMU mapping and unmapping flow config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240815/202408152355.Qx4KRzRh-lkp@xxxxxxxxx/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240815/202408152355.Qx4KRzRh-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/202408152355.Qx4KRzRh-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/media/pci/intel/ipu6/ipu6-mmu.c:261:9: warning: variable 'unmapped' set but not used [-Wunused-but-set-variable] 261 | size_t unmapped = 0; | ^ 1 warning generated. vim +/unmapped +261 drivers/media/pci/intel/ipu6/ipu6-mmu.c 254 255 static void l2_unmap(struct ipu6_mmu_info *mmu_info, unsigned long iova, 256 phys_addr_t dummy, size_t size) 257 { 258 unsigned int l2_entries; 259 unsigned int l2_idx; 260 unsigned long flags; > 261 size_t unmapped = 0; 262 u32 l1_idx; 263 u32 *l2_pt; 264 265 spin_lock_irqsave(&mmu_info->lock, flags); 266 for (l1_idx = iova >> ISP_L1PT_SHIFT; 267 size > 0 && l1_idx < ISP_L1PT_PTES; l1_idx++) { 268 dev_dbg(mmu_info->dev, 269 "unmapping l2 pgtable (l1 index %u (iova 0x%8.8lx))\n", 270 l1_idx, iova); 271 272 if (mmu_info->l1_pt[l1_idx] == mmu_info->dummy_l2_pteval) { 273 dev_err(mmu_info->dev, 274 "unmap not mapped iova 0x%8.8lx l1 index %u\n", 275 iova, l1_idx); 276 continue; 277 } 278 l2_pt = mmu_info->l2_pts[l1_idx]; 279 280 l2_entries = 0; 281 for (l2_idx = (iova & ISP_L2PT_MASK) >> ISP_L2PT_SHIFT; 282 size > 0 && l2_idx < ISP_L2PT_PTES; l2_idx++) { 283 dev_dbg(mmu_info->dev, 284 "unmap l2 index %u with pteval 0x%10.10llx\n", 285 l2_idx, TBL_PHYS_ADDR(l2_pt[l2_idx])); 286 l2_pt[l2_idx] = mmu_info->dummy_page_pteval; 287 288 iova += ISP_PAGE_SIZE; 289 unmapped += ISP_PAGE_SIZE; 290 size -= ISP_PAGE_SIZE; 291 292 l2_entries++; 293 } 294 295 WARN_ON_ONCE(!l2_entries); 296 clflush_cache_range(&l2_pt[l2_idx - l2_entries], 297 sizeof(l2_pt[0]) * l2_entries); 298 } 299 300 WARN_ON_ONCE(size); 301 spin_unlock_irqrestore(&mmu_info->lock, flags); 302 } 303 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
