Hi John, Thank you for the patch! Yet something to improve: [auto build test ERROR on rdma/for-next] [also build test ERROR on v5.0-rc8 next-20190301] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/john-hubbard-gmail-com/RDMA-umem-minor-bug-fix-and-cleanup-in-error-handling-paths/20190302-233314 base: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next config: nds32-allyesconfig (attached as .config) compiler: nds32le-linux-gcc (GCC) 6.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=6.4.0 make.cross ARCH=nds32 All errors (new ones prefixed by >>): drivers/infiniband/core/umem_odp.c: In function 'ib_umem_odp_map_dma_pages': >> drivers/infiniband/core/umem_odp.c:684:4: error: implicit declaration of function 'release_pages' [-Werror=implicit-function-declaration] release_pages(&local_page_list[j], npages - j); ^~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/release_pages +684 drivers/infiniband/core/umem_odp.c 559 560 /** 561 * ib_umem_odp_map_dma_pages - Pin and DMA map userspace memory in an ODP MR. 562 * 563 * Pins the range of pages passed in the argument, and maps them to 564 * DMA addresses. The DMA addresses of the mapped pages is updated in 565 * umem_odp->dma_list. 566 * 567 * Returns the number of pages mapped in success, negative error code 568 * for failure. 569 * An -EAGAIN error code is returned when a concurrent mmu notifier prevents 570 * the function from completing its task. 571 * An -ENOENT error code indicates that userspace process is being terminated 572 * and mm was already destroyed. 573 * @umem_odp: the umem to map and pin 574 * @user_virt: the address from which we need to map. 575 * @bcnt: the minimal number of bytes to pin and map. The mapping might be 576 * bigger due to alignment, and may also be smaller in case of an error 577 * pinning or mapping a page. The actual pages mapped is returned in 578 * the return value. 579 * @access_mask: bit mask of the requested access permissions for the given 580 * range. 581 * @current_seq: the MMU notifiers sequance value for synchronization with 582 * invalidations. the sequance number is read from 583 * umem_odp->notifiers_seq before calling this function 584 */ 585 int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt, 586 u64 bcnt, u64 access_mask, 587 unsigned long current_seq) 588 { 589 struct ib_umem *umem = &umem_odp->umem; 590 struct task_struct *owning_process = NULL; 591 struct mm_struct *owning_mm = umem_odp->umem.owning_mm; 592 struct page **local_page_list = NULL; 593 u64 page_mask, off; 594 int j, k, ret = 0, start_idx, npages = 0, page_shift; 595 unsigned int flags = 0; 596 phys_addr_t p = 0; 597 598 if (access_mask == 0) 599 return -EINVAL; 600 601 if (user_virt < ib_umem_start(umem) || 602 user_virt + bcnt > ib_umem_end(umem)) 603 return -EFAULT; 604 605 local_page_list = (struct page **)__get_free_page(GFP_KERNEL); 606 if (!local_page_list) 607 return -ENOMEM; 608 609 page_shift = umem->page_shift; 610 page_mask = ~(BIT(page_shift) - 1); 611 off = user_virt & (~page_mask); 612 user_virt = user_virt & page_mask; 613 bcnt += off; /* Charge for the first page offset as well. */ 614 615 /* 616 * owning_process is allowed to be NULL, this means somehow the mm is 617 * existing beyond the lifetime of the originating process.. Presumably 618 * mmget_not_zero will fail in this case. 619 */ 620 owning_process = get_pid_task(umem_odp->per_mm->tgid, PIDTYPE_PID); 621 if (WARN_ON(!mmget_not_zero(umem_odp->umem.owning_mm))) { 622 ret = -EINVAL; 623 goto out_put_task; 624 } 625 626 if (access_mask & ODP_WRITE_ALLOWED_BIT) 627 flags |= FOLL_WRITE; 628 629 start_idx = (user_virt - ib_umem_start(umem)) >> page_shift; 630 k = start_idx; 631 632 while (bcnt > 0) { 633 const size_t gup_num_pages = min_t(size_t, 634 (bcnt + BIT(page_shift) - 1) >> page_shift, 635 PAGE_SIZE / sizeof(struct page *)); 636 637 down_read(&owning_mm->mmap_sem); 638 /* 639 * Note: this might result in redundent page getting. We can 640 * avoid this by checking dma_list to be 0 before calling 641 * get_user_pages. However, this make the code much more 642 * complex (and doesn't gain us much performance in most use 643 * cases). 644 */ 645 npages = get_user_pages_remote(owning_process, owning_mm, 646 user_virt, gup_num_pages, 647 flags, local_page_list, NULL, NULL); 648 up_read(&owning_mm->mmap_sem); 649 650 if (npages < 0) { 651 if (npages != -EAGAIN) 652 pr_warn("fail to get %zu user pages with error %d\n", 653 gup_num_pages, npages); 654 else 655 pr_debug("fail to get %zu user pages with error %d\n", 656 gup_num_pages, npages); 657 break; 658 } 659 660 bcnt -= min_t(size_t, npages << PAGE_SHIFT, bcnt); 661 mutex_lock(&umem_odp->umem_mutex); 662 for (j = 0; j < npages; j++, user_virt += PAGE_SIZE) { 663 ret = ib_umem_odp_map_dma_single_page( 664 umem_odp, k, local_page_list[j], 665 access_mask, current_seq); 666 if (ret < 0) { 667 if (ret != -EAGAIN) 668 pr_warn("ib_umem_odp_map_dma_single_page failed with error %d\n", ret); 669 else 670 pr_debug("ib_umem_odp_map_dma_single_page failed with error %d\n", ret); 671 break; 672 } 673 674 p = page_to_phys(local_page_list[j]); 675 k++; 676 } 677 mutex_unlock(&umem_odp->umem_mutex); 678 679 if (ret < 0) { 680 /* 681 * Release pages, starting at the the first page 682 * that experienced an error. 683 */ > 684 release_pages(&local_page_list[j], npages - j); 685 break; 686 } 687 } 688 689 if (ret >= 0) { 690 if (npages < 0 && k == start_idx) 691 ret = npages; 692 else 693 ret = k - start_idx; 694 } 695 696 mmput(owning_mm); 697 out_put_task: 698 if (owning_process) 699 put_task_struct(owning_process); 700 free_page((unsigned long)local_page_list); 701 return ret; 702 } 703 EXPORT_SYMBOL(ib_umem_odp_map_dma_pages); 704 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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