D34715.diff
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	diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
	--- a/sys/compat/linuxkpi/common/src/linux_pci.c
	+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
	@@ -56,6 +56,7 @@
	#include <dev/pci/pci_iov.h>
	#include <dev/backlight/backlight.h>

	+#include <linux/kernel.h>
	#include <linux/kobject.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	@@ -77,6 +78,14 @@
	/* Undef the linux function macro defined in linux/pci.h */
	#undef pci_get_class

	+extern int linuxkpi_debug;
	+
	+SYSCTL_DECL(_compat_linuxkpi);
	+
	+static counter_u64_t lkpi_pci_nseg1_fail;
	+SYSCTL_COUNTER_U64(_compat_linuxkpi, OID_AUTO, lkpi_pci_nseg1_fail, CTLFLAG_RD,
	+ &lkpi_pci_nseg1_fail, "Count of busdma mapping failures of single-segment");
	+
	static device_probe_t linux_pci_probe;
	static device_attach_t linux_pci_attach;
	static device_detach_t linux_pci_detach;
	@@ -796,7 +805,7 @@
	linux_dma_obj_zone = uma_zcreate("linux_dma_object",
	sizeof(struct linux_dma_obj), NULL, NULL, NULL, NULL,
	UMA_ALIGN_PTR, 0);
	-
	+ lkpi_pci_nseg1_fail = counter_u64_alloc(M_WAITOK);
	}
	SYSINIT(linux_dma, SI_SUB_DRIVERS, SI_ORDER_THIRD, linux_dma_init, NULL);

	@@ -804,6 +813,7 @@
	linux_dma_uninit(void *arg)
	{

	+ counter_u64_free(lkpi_pci_nseg1_fail);
	uma_zdestroy(linux_dma_obj_zone);
	uma_zdestroy(linux_dma_trie_zone);
	}
	@@ -866,6 +876,9 @@
	bus_dmamap_destroy(obj->dmat, obj->dmamap);
	DMA_PRIV_UNLOCK(priv);
	uma_zfree(linux_dma_obj_zone, obj);
	+ counter_u64_add(lkpi_pci_nseg1_fail, 1);
	+ if (linuxkpi_debug)
	+ dump_stack();
	return (0);
	}