Hi Swathi, FYI, the error/warning still remains. tree: https://android.googlesource.com/kernel/common android-4.19-stable head: f69cc0ed2fca72b2388037e10daac94b0473739c commit: 27de1978c331d4e7571a5d0187ef1802d65dbf65 [9069/9999] ANDROID: GKI: iommu/io-pgtable-arm: LPAE related updates by vendor config: x86_64-randconfig-a016-20200622 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 1d4c87335d5236ea1f35937e1014980ba961ae34) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 27de1978c331d4e7571a5d0187ef1802d65dbf65 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/iommu/io-pgtable-arm.c:312:16: error: implicit declaration of function 'io_pgtable_alloc_pages_exact' [-Werror,-Wimplicit-function-declaration] void *pages = io_pgtable_alloc_pages_exact(cfg, cookie, size, ^ drivers/iommu/io-pgtable-arm.c:312:8: warning: incompatible integer to pointer conversion initializing 'void *' with an expression of type 'int' [-Wint-conversion] void *pages = io_pgtable_alloc_pages_exact(cfg, cookie, size, ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iommu/io-pgtable-arm.c:337:2: error: implicit declaration of function 'io_pgtable_free_pages_exact' [-Werror,-Wimplicit-function-declaration] io_pgtable_free_pages_exact(cfg, cookie, pages, size); ^ drivers/iommu/io-pgtable-arm.c:337:2: note: did you mean 'io_pgtable_alloc_pages_exact'? drivers/iommu/io-pgtable-arm.c:312:16: note: 'io_pgtable_alloc_pages_exact' declared here void *pages = io_pgtable_alloc_pages_exact(cfg, cookie, size, ^ drivers/iommu/io-pgtable-arm.c:347:2: error: implicit declaration of function 'io_pgtable_free_pages_exact' [-Werror,-Wimplicit-function-declaration] io_pgtable_free_pages_exact(cfg, cookie, pages, size); ^ drivers/iommu/io-pgtable-arm.c:572:19: error: use of undeclared identifier 'IOMMU_USE_UPSTREAM_HINT' else if (prot & IOMMU_USE_UPSTREAM_HINT) ^ drivers/iommu/io-pgtable-arm.c:575:19: error: use of undeclared identifier 'IOMMU_USE_LLC_NWA' else if (prot & IOMMU_USE_LLC_NWA) ^ size_t pgsize = iommu_pgsize( ^ drivers/iommu/io-pgtable-arm.c:767:9: error: implicit declaration of function 'iommu_pgsize' [-Werror,-Wimplicit-function-declaration] size = iommu_pgsize(data->iop.cfg.pgsize_bitmap, iova, size); ^ drivers/iommu/io-pgtable-arm.c:901:19: error: implicit declaration of function 'iommu_pgsize' [-Werror,-Wimplicit-function-declaration] size_to_unmap = iommu_pgsize(data->iop.cfg.pgsize_bitmap, iova, ^ drivers/iommu/io-pgtable-arm.c:1095:4: error: field designator 'map_sg' does not refer to any field in type 'struct io_pgtable_ops' .map_sg = arm_lpae_map_sg, ^ drivers/iommu/io-pgtable-arm.c:1098:4: error: field designator 'is_iova_coherent' does not refer to any field in type 'struct io_pgtable_ops' .is_iova_coherent = arm_lpae_is_iova_coherent, ^ drivers/iommu/io-pgtable-arm.c:1099:4: error: field designator 'iova_to_pte' does not refer to any field in type 'struct io_pgtable_ops'; did you mean 'iova_to_phys'? .iova_to_pte = arm_lpae_iova_get_pte, ^~~~~~~~~~~ iova_to_phys include/linux/io-pgtable.h:132:16: note: 'iova_to_phys' declared here phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, ^ drivers/iommu/io-pgtable-arm.c:1113:8: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT' | IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT ^ drivers/iommu/io-pgtable-arm.c:1114:8: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE' | IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE ^ drivers/iommu/io-pgtable-arm.c:1115:8: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QCOM_USE_LLC_NWA' | IO_PGTABLE_QUIRK_QCOM_USE_LLC_NWA)) ^ drivers/iommu/io-pgtable-arm.c:1127:26: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT' else if ((cfg->quirks & IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT) && ^ drivers/iommu/io-pgtable-arm.c:1128:18: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE' (cfg->quirks & IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE)) ^ drivers/iommu/io-pgtable-arm.c:1132:25: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT' else if (cfg->quirks & IO_PGTABLE_QUIRK_QCOM_USE_UPSTREAM_HINT) ^ drivers/iommu/io-pgtable-arm.c:1136:26: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QCOM_USE_LLC_NWA' else if ((cfg->quirks & IO_PGTABLE_QUIRK_QCOM_USE_LLC_NWA) && ^ drivers/iommu/io-pgtable-arm.c:1137:18: error: use of undeclared identifier 'IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE' (cfg->quirks & IO_PGTABLE_QUIRK_QSMMUV500_NON_SHAREABLE)) ^ fatal error: too many errors emitted, stopping now [-ferror-limit=] 1 warning and 20 errors generated. vim +/iommu_pgsize +666 drivers/iommu/io-pgtable-arm.c 625 626 static int arm_lpae_map_sg(struct io_pgtable_ops *ops, unsigned long iova, 627 struct scatterlist *sg, unsigned int nents, 628 int iommu_prot, size_t *size) 629 { 630 struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); 631 arm_lpae_iopte *ptep = data->pgd; 632 int lvl = ARM_LPAE_START_LVL(data); 633 arm_lpae_iopte prot; 634 struct scatterlist *s; 635 size_t mapped = 0; 636 int i; 637 int ret = -EINVAL; 638 unsigned int min_pagesz; 639 struct io_pgtable_cfg *cfg = &data->iop.cfg; 640 struct map_state ms; 641 642 /* If no access, then nothing to do */ 643 if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) 644 goto out_err; 645 646 prot = arm_lpae_prot_to_pte(data, iommu_prot); 647 648 min_pagesz = 1 << __ffs(cfg->pgsize_bitmap); 649 650 memset(&ms, 0, sizeof(ms)); 651 652 for_each_sg(sg, s, nents, i) { 653 phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset; 654 size_t size = s->length; 655 656 /* 657 * We are mapping on IOMMU page boundaries, so offset within 658 * the page must be 0. However, the IOMMU may support pages 659 * smaller than PAGE_SIZE, so s->offset may still represent 660 * an offset of that boundary within the CPU page. 661 */ 662 if (!IS_ALIGNED(s->offset, min_pagesz)) 663 goto out_err; 664 665 while (size) { 667 cfg->pgsize_bitmap, iova | phys, size); 668 669 if (ms.pgtable && (iova < ms.iova_end)) { 670 arm_lpae_iopte *ptep = ms.pgtable + 671 ARM_LPAE_LVL_IDX(iova, MAP_STATE_LVL, 672 data); 673 arm_lpae_init_pte( 674 data, iova, phys, prot, MAP_STATE_LVL, 675 ptep, ms.prev_pgtable, false); 676 ms.num_pte++; 677 } else { 678 ret = __arm_lpae_map(data, iova, phys, pgsize, 679 prot, lvl, ptep, NULL, &ms); 680 if (ret) 681 goto out_err; 682 } 683 684 iova += pgsize; 685 mapped += pgsize; 686 phys += pgsize; 687 size -= pgsize; 688 } 689 } 690 691 if (ms.pgtable) 692 pgtable_dma_sync_single_for_device(cfg, 693 __arm_lpae_dma_addr(ms.pte_start), 694 ms.num_pte * sizeof(*ms.pte_start), 695 DMA_TO_DEVICE); 696 697 /* 698 * Synchronise all PTE updates for the new mapping before there's 699 * a chance for anything to kick off a table walk for the new iova. 700 */ 701 wmb(); 702 703 return mapped; 704 705 out_err: 706 /* Return the size of the partial mapping so that they can be undone */ 707 *size = mapped; 708 return ret; 709 } 710 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org