Hi Sourab, [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on next-20170731] [cannot apply to v4.13-rc3] [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/Sagar-Arun-Kamble/i915-perf-support-for-command-stream-based-OA-GPU-and-workload-metrics-capture/20170731-184412 base: git://anongit.freedesktop.org/drm-intel for-linux-next reproduce: make htmldocs All warnings (new ones prefixed by >>): WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org) include/linux/init.h:1: warning: no structured comments found include/linux/mod_devicetable.h:687: warning: Excess struct/union/enum/typedef member 'ver_major' description in 'fsl_mc_device_id' include/linux/mod_devicetable.h:687: warning: Excess struct/union/enum/typedef member 'ver_minor' description in 'fsl_mc_device_id' kernel/sched/core.c:2080: warning: No description found for parameter 'rf' kernel/sched/core.c:2080: warning: Excess function parameter 'cookie' description in 'try_to_wake_up_local' include/linux/wait.h:555: warning: No description found for parameter 'wq' include/linux/wait.h:555: warning: Excess function parameter 'wq_head' description in 'wait_event_interruptible_hrtimeout' include/linux/wait.h:759: warning: No description found for parameter 'wq_head' include/linux/wait.h:759: warning: Excess function parameter 'wq' description in 'wait_event_killable' include/linux/kthread.h:26: warning: Excess function parameter '...' description in 'kthread_create' kernel/sys.c:1: warning: no structured comments found include/linux/device.h:968: warning: No description found for parameter 'dma_ops' drivers/dma-buf/seqno-fence.c:1: warning: no structured comments found include/linux/iio/iio.h:603: warning: No description found for parameter 'trig_readonly' include/linux/iio/trigger.h:151: warning: No description found for parameter 'indio_dev' include/linux/iio/trigger.h:151: warning: No description found for parameter 'trig' include/linux/device.h:969: warning: No description found for parameter 'dma_ops' drivers/ata/libata-eh.c:1449: warning: No description found for parameter 'link' drivers/ata/libata-eh.c:1449: warning: Excess function parameter 'ap' description in 'ata_eh_done' drivers/ata/libata-eh.c:1590: warning: No description found for parameter 'qc' drivers/ata/libata-eh.c:1590: warning: Excess function parameter 'dev' description in 'ata_eh_request_sense' drivers/mtd/nand/nand_base.c:2751: warning: Excess function parameter 'cached' description in 'nand_write_page' drivers/mtd/nand/nand_base.c:2751: warning: Excess function parameter 'cached' description in 'nand_write_page' arch/s390/include/asm/cmb.h:1: warning: no structured comments found drivers/scsi/scsi_lib.c:1116: warning: No description found for parameter 'rq' drivers/scsi/constants.c:1: warning: no structured comments found include/linux/usb/gadget.h:230: warning: No description found for parameter 'claimed' include/linux/usb/gadget.h:230: warning: No description found for parameter 'enabled' include/linux/usb/gadget.h:412: warning: No description found for parameter 'quirk_altset_not_supp' include/linux/usb/gadget.h:412: warning: No description found for parameter 'quirk_stall_not_supp' include/linux/usb/gadget.h:412: warning: No description found for parameter 'quirk_zlp_not_supp' fs/inode.c:1666: warning: No description found for parameter 'rcu' include/linux/jbd2.h:443: warning: No description found for parameter 'i_transaction' include/linux/jbd2.h:443: warning: No description found for parameter 'i_next_transaction' include/linux/jbd2.h:443: warning: No description found for parameter 'i_list' include/linux/jbd2.h:443: warning: No description found for parameter 'i_vfs_inode' include/linux/jbd2.h:443: warning: No description found for parameter 'i_flags' include/linux/jbd2.h:497: warning: No description found for parameter 'h_rsv_handle' include/linux/jbd2.h:497: warning: No description found for parameter 'h_reserved' include/linux/jbd2.h:497: warning: No description found for parameter 'h_type' include/linux/jbd2.h:497: warning: No description found for parameter 'h_line_no' include/linux/jbd2.h:497: warning: No description found for parameter 'h_start_jiffies' include/linux/jbd2.h:497: warning: No description found for parameter 'h_requested_credits' include/linux/jbd2.h:497: warning: No description found for parameter 'saved_alloc_context' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_chkpt_bhs' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_devname' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_average_commit_time' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_min_batch_time' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_max_batch_time' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_commit_callback' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_failed_commit' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_chksum_driver' include/linux/jbd2.h:1050: warning: No description found for parameter 'j_csum_seed' fs/jbd2/transaction.c:511: warning: No description found for parameter 'type' fs/jbd2/transaction.c:511: warning: No description found for parameter 'line_no' fs/jbd2/transaction.c:641: warning: No description found for parameter 'gfp_mask' include/drm/drm_drv.h:553: warning: No description found for parameter 'debugfs_init' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_open_object' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_close_object' include/drm/drm_drv.h:553: warning: No description found for parameter 'prime_handle_to_fd' include/drm/drm_drv.h:553: warning: No description found for parameter 'prime_fd_to_handle' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_export' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_import' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_pin' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_unpin' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_res_obj' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_get_sg_table' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_import_sg_table' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_vmap' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_vunmap' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_prime_mmap' include/drm/drm_drv.h:553: warning: No description found for parameter 'gem_vm_ops' include/drm/drm_drv.h:553: warning: No description found for parameter 'major' include/drm/drm_drv.h:553: warning: No description found for parameter 'minor' include/drm/drm_drv.h:553: warning: No description found for parameter 'patchlevel' include/drm/drm_drv.h:553: warning: No description found for parameter 'name' include/drm/drm_drv.h:553: warning: No description found for parameter 'desc' include/drm/drm_drv.h:553: warning: No description found for parameter 'date' include/drm/drm_drv.h:553: warning: No description found for parameter 'driver_features' drivers/gpu/drm/drm_modes.c:1623: warning: No description found for parameter 'display' drivers/gpu/drm/drm_modes.c:1623: warning: Excess function parameter 'connector' description in 'drm_mode_is_420_only' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' drivers/gpu/drm/i915/i915_drv.h:2000: warning: No description found for parameter 'emit_sample_capture' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_buffer' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples_lock' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'poll_wq' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'pollin' drivers/gpu/drm/i915/i915_drv.h:2000: warning: No description found for parameter 'emit_sample_capture' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_buffer' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples_lock' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'poll_wq' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'pollin' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' drivers/gpu/drm/i915/i915_drv.h:2000: warning: No description found for parameter 'emit_sample_capture' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_buffer' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'cs_samples_lock' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'poll_wq' drivers/gpu/drm/i915/i915_drv.h:2078: warning: No description found for parameter 'pollin' >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' drivers/gpu/drm/i915/i915_perf.c:1: warning: no structured comments found >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' drivers/gpu/drm/i915/i915_perf.c:1: warning: no structured comments found >> drivers/gpu/drm/i915/i915_perf.c:684: warning: No description found for parameter 'last_ts' drivers/gpu/drm/i915/i915_perf.c:1: warning: no structured comments found vim +/last_ts +684 drivers/gpu/drm/i915/i915_perf.c b0aca6b4 Sourab Gupta 2017-07-31 657 b0aca6b4 Sourab Gupta 2017-07-31 658 /** 24459f50 Sourab Gupta 2017-07-31 659 * oa_buffer_num_reports_unlocked - check for data and update tail ptr state 0dd860cf Robert Bragg 2017-05-11 660 * @dev_priv: i915 device instance d7965152 Robert Bragg 2016-11-07 661 * 0dd860cf Robert Bragg 2017-05-11 662 * This is either called via fops (for blocking reads in user ctx) or the poll 0dd860cf Robert Bragg 2017-05-11 663 * check hrtimer (atomic ctx) to check the OA buffer tail pointer and check 0dd860cf Robert Bragg 2017-05-11 664 * if there is data available for userspace to read. d7965152 Robert Bragg 2016-11-07 665 * 0dd860cf Robert Bragg 2017-05-11 666 * This function is central to providing a workaround for the OA unit tail 0dd860cf Robert Bragg 2017-05-11 667 * pointer having a race with respect to what data is visible to the CPU. 0dd860cf Robert Bragg 2017-05-11 668 * It is responsible for reading tail pointers from the hardware and giving 0dd860cf Robert Bragg 2017-05-11 669 * the pointers time to 'age' before they are made available for reading. 0dd860cf Robert Bragg 2017-05-11 670 * (See description of OA_TAIL_MARGIN_NSEC above for further details.) 0dd860cf Robert Bragg 2017-05-11 671 * 24459f50 Sourab Gupta 2017-07-31 672 * Besides returning num of reports when there is data available to read() it 0dd860cf Robert Bragg 2017-05-11 673 * also has the side effect of updating the oa_buffer.tails[], .aging_timestamp 0dd860cf Robert Bragg 2017-05-11 674 * and .aged_tail_idx state used for reading. 0dd860cf Robert Bragg 2017-05-11 675 * 0dd860cf Robert Bragg 2017-05-11 676 * Note: It's safe to read OA config state here unlocked, assuming that this is 0dd860cf Robert Bragg 2017-05-11 677 * only called while the stream is enabled, while the global OA configuration 0dd860cf Robert Bragg 2017-05-11 678 * can't be modified. 0dd860cf Robert Bragg 2017-05-11 679 * 24459f50 Sourab Gupta 2017-07-31 680 * Returns: number of samples available to read d7965152 Robert Bragg 2016-11-07 681 */ 24459f50 Sourab Gupta 2017-07-31 682 static u32 oa_buffer_num_reports_unlocked( 24459f50 Sourab Gupta 2017-07-31 683 struct drm_i915_private *dev_priv, u32 *last_ts) d7965152 Robert Bragg 2016-11-07 @684 { d7965152 Robert Bragg 2016-11-07 685 int report_size = dev_priv->perf.oa.oa_buffer.format_size; 0dd860cf Robert Bragg 2017-05-11 686 unsigned long flags; 0dd860cf Robert Bragg 2017-05-11 687 unsigned int aged_idx; 24459f50 Sourab Gupta 2017-07-31 688 u32 head, hw_tail, aged_tail, aging_tail, num_reports = 0; 0dd860cf Robert Bragg 2017-05-11 689 u64 now; 0dd860cf Robert Bragg 2017-05-11 690 0dd860cf Robert Bragg 2017-05-11 691 /* We have to consider the (unlikely) possibility that read() errors 0dd860cf Robert Bragg 2017-05-11 692 * could result in an OA buffer reset which might reset the head, 0dd860cf Robert Bragg 2017-05-11 693 * tails[] and aged_tail state. 0dd860cf Robert Bragg 2017-05-11 694 */ 0dd860cf Robert Bragg 2017-05-11 695 spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags); 0dd860cf Robert Bragg 2017-05-11 696 0dd860cf Robert Bragg 2017-05-11 697 /* NB: The head we observe here might effectively be a little out of 0dd860cf Robert Bragg 2017-05-11 698 * date (between head and tails[aged_idx].offset if there is currently 0dd860cf Robert Bragg 2017-05-11 699 * a read() in progress. 0dd860cf Robert Bragg 2017-05-11 700 */ 0dd860cf Robert Bragg 2017-05-11 701 head = dev_priv->perf.oa.oa_buffer.head; 0dd860cf Robert Bragg 2017-05-11 702 0dd860cf Robert Bragg 2017-05-11 703 aged_idx = dev_priv->perf.oa.oa_buffer.aged_tail_idx; 0dd860cf Robert Bragg 2017-05-11 704 aged_tail = dev_priv->perf.oa.oa_buffer.tails[aged_idx].offset; 0dd860cf Robert Bragg 2017-05-11 705 aging_tail = dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset; 0dd860cf Robert Bragg 2017-05-11 706 19f81df2 Robert Bragg 2017-06-13 707 hw_tail = dev_priv->perf.oa.ops.oa_hw_tail_read(dev_priv); 0dd860cf Robert Bragg 2017-05-11 708 0dd860cf Robert Bragg 2017-05-11 709 /* The tail pointer increases in 64 byte increments, 0dd860cf Robert Bragg 2017-05-11 710 * not in report_size steps... 0dd860cf Robert Bragg 2017-05-11 711 */ 0dd860cf Robert Bragg 2017-05-11 712 hw_tail &= ~(report_size - 1); 0dd860cf Robert Bragg 2017-05-11 713 0dd860cf Robert Bragg 2017-05-11 714 now = ktime_get_mono_fast_ns(); 0dd860cf Robert Bragg 2017-05-11 715 4117ebc7 Robert Bragg 2017-05-11 716 /* Update the aged tail 4117ebc7 Robert Bragg 2017-05-11 717 * 4117ebc7 Robert Bragg 2017-05-11 718 * Flip the tail pointer available for read()s once the aging tail is 4117ebc7 Robert Bragg 2017-05-11 719 * old enough to trust that the corresponding data will be visible to 4117ebc7 Robert Bragg 2017-05-11 720 * the CPU... 4117ebc7 Robert Bragg 2017-05-11 721 * 4117ebc7 Robert Bragg 2017-05-11 722 * Do this before updating the aging pointer in case we may be able to 4117ebc7 Robert Bragg 2017-05-11 723 * immediately start aging a new pointer too (if new data has become 4117ebc7 Robert Bragg 2017-05-11 724 * available) without needing to wait for a later hrtimer callback. 4117ebc7 Robert Bragg 2017-05-11 725 */ 4117ebc7 Robert Bragg 2017-05-11 726 if (aging_tail != INVALID_TAIL_PTR && 4117ebc7 Robert Bragg 2017-05-11 727 ((now - dev_priv->perf.oa.oa_buffer.aging_timestamp) > 4117ebc7 Robert Bragg 2017-05-11 728 OA_TAIL_MARGIN_NSEC)) { 24459f50 Sourab Gupta 2017-07-31 729 u32 mask = (OA_BUFFER_SIZE - 1); 24459f50 Sourab Gupta 2017-07-31 730 u32 gtt_offset = i915_ggtt_offset( 24459f50 Sourab Gupta 2017-07-31 731 dev_priv->perf.oa.oa_buffer.vma); 24459f50 Sourab Gupta 2017-07-31 732 u32 head = (dev_priv->perf.oa.oa_buffer.head - gtt_offset) 24459f50 Sourab Gupta 2017-07-31 733 & mask; 24459f50 Sourab Gupta 2017-07-31 734 u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr; 24459f50 Sourab Gupta 2017-07-31 735 u32 *report32; 19f81df2 Robert Bragg 2017-06-13 736 4117ebc7 Robert Bragg 2017-05-11 737 aged_idx ^= 1; 4117ebc7 Robert Bragg 2017-05-11 738 dev_priv->perf.oa.oa_buffer.aged_tail_idx = aged_idx; 4117ebc7 Robert Bragg 2017-05-11 739 4117ebc7 Robert Bragg 2017-05-11 740 aged_tail = aging_tail; 4117ebc7 Robert Bragg 2017-05-11 741 4117ebc7 Robert Bragg 2017-05-11 742 /* Mark that we need a new pointer to start aging... */ 4117ebc7 Robert Bragg 2017-05-11 743 dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset = INVALID_TAIL_PTR; 4117ebc7 Robert Bragg 2017-05-11 744 aging_tail = INVALID_TAIL_PTR; 24459f50 Sourab Gupta 2017-07-31 745 24459f50 Sourab Gupta 2017-07-31 746 num_reports = OA_TAKEN(((aged_tail - gtt_offset) & mask), head)/ 24459f50 Sourab Gupta 2017-07-31 747 report_size; 24459f50 Sourab Gupta 2017-07-31 748 24459f50 Sourab Gupta 2017-07-31 749 /* read the timestamp of last OA report */ 24459f50 Sourab Gupta 2017-07-31 750 head = (head + report_size*(num_reports - 1)) & mask; 24459f50 Sourab Gupta 2017-07-31 751 report32 = (u32 *)(oa_buf_base + head); 24459f50 Sourab Gupta 2017-07-31 752 *last_ts = report32[1]; 4117ebc7 Robert Bragg 2017-05-11 753 } 4117ebc7 Robert Bragg 2017-05-11 754 0dd860cf Robert Bragg 2017-05-11 755 /* Update the aging tail 0dd860cf Robert Bragg 2017-05-11 756 * 0dd860cf Robert Bragg 2017-05-11 757 * We throttle aging tail updates until we have a new tail that 0dd860cf Robert Bragg 2017-05-11 758 * represents >= one report more data than is already available for 0dd860cf Robert Bragg 2017-05-11 759 * reading. This ensures there will be enough data for a successful 0dd860cf Robert Bragg 2017-05-11 760 * read once this new pointer has aged and ensures we will give the new 0dd860cf Robert Bragg 2017-05-11 761 * pointer time to age. 0dd860cf Robert Bragg 2017-05-11 762 */ 0dd860cf Robert Bragg 2017-05-11 763 if (aging_tail == INVALID_TAIL_PTR && 0dd860cf Robert Bragg 2017-05-11 764 (aged_tail == INVALID_TAIL_PTR || 0dd860cf Robert Bragg 2017-05-11 765 OA_TAKEN(hw_tail, aged_tail) >= report_size)) { 0dd860cf Robert Bragg 2017-05-11 766 struct i915_vma *vma = dev_priv->perf.oa.oa_buffer.vma; 0dd860cf Robert Bragg 2017-05-11 767 u32 gtt_offset = i915_ggtt_offset(vma); 0dd860cf Robert Bragg 2017-05-11 768 0dd860cf Robert Bragg 2017-05-11 769 /* Be paranoid and do a bounds check on the pointer read back 0dd860cf Robert Bragg 2017-05-11 770 * from hardware, just in case some spurious hardware condition 0dd860cf Robert Bragg 2017-05-11 771 * could put the tail out of bounds... 0dd860cf Robert Bragg 2017-05-11 772 */ 0dd860cf Robert Bragg 2017-05-11 773 if (hw_tail >= gtt_offset && 0dd860cf Robert Bragg 2017-05-11 774 hw_tail < (gtt_offset + OA_BUFFER_SIZE)) { 0dd860cf Robert Bragg 2017-05-11 775 dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset = 0dd860cf Robert Bragg 2017-05-11 776 aging_tail = hw_tail; 0dd860cf Robert Bragg 2017-05-11 777 dev_priv->perf.oa.oa_buffer.aging_timestamp = now; 0dd860cf Robert Bragg 2017-05-11 778 } else { 0dd860cf Robert Bragg 2017-05-11 779 DRM_ERROR("Ignoring spurious out of range OA buffer tail pointer = %u\n", 0dd860cf Robert Bragg 2017-05-11 780 hw_tail); 0dd860cf Robert Bragg 2017-05-11 781 } 0dd860cf Robert Bragg 2017-05-11 782 } 0dd860cf Robert Bragg 2017-05-11 783 0dd860cf Robert Bragg 2017-05-11 784 spin_unlock_irqrestore(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags); 0dd860cf Robert Bragg 2017-05-11 785 24459f50 Sourab Gupta 2017-07-31 786 return aged_tail == INVALID_TAIL_PTR ? 0 : num_reports; d7965152 Robert Bragg 2016-11-07 787 } d7965152 Robert Bragg 2016-11-07 788 :::::: The code at line 684 was first introduced by commit :::::: d79651522e89c4ffa8992b48dfe449f0c583f809 drm/i915: Enable i915 perf stream for Haswell OA unit :::::: TO: Robert Bragg <robert@xxxxxxxxxxxxx> :::::: CC: Daniel Vetter <daniel.vetter@xxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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