diff -ur dahdi-linux-2.11.1/drivers/dahdi/dahdi-base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/dahdi-base.c
--- dahdi-linux-2.11.1/drivers/dahdi/dahdi-base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/dahdi-base.c	2017-05-09 20:34:45.170079849 +0200
@@ -47,6 +47,9 @@
 #include <linux/kmod.h>
 #include <linux/moduleparam.h>
 #include <linux/sched.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/list.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
diff -ur dahdi-linux-2.11.1/drivers/dahdi/dahdi_dynamic.c dahdi-linux-2.11.1-4.11/drivers/dahdi/dahdi_dynamic.c
--- dahdi-linux-2.11.1/drivers/dahdi/dahdi_dynamic.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/dahdi_dynamic.c	2017-05-09 20:38:03.809649973 +0200
@@ -467,7 +467,11 @@
 
 	/* We shouldn't have more than the two references at this point.  If
 	 * we do, there are probably channels that are still opened. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,11,0)
 	if (atomic_read(&d->kref.refcount) > 2) {
+#else
+	if (kref_read(&d->kref) > 2) {
+#endif
 		dynamic_put(d);
 		return -EBUSY;
 	}
diff -ur dahdi-linux-2.11.1/drivers/dahdi/wcaxx-base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/wcaxx-base.c
--- dahdi-linux-2.11.1/drivers/dahdi/wcaxx-base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/wcaxx-base.c	2017-05-09 20:39:05.690553708 +0200
@@ -28,6 +28,9 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/sched.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/moduleparam.h>
diff -ur dahdi-linux-2.11.1/drivers/dahdi/wctc4xxp/base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/wctc4xxp/base.c
--- dahdi-linux-2.11.1/drivers/dahdi/wctc4xxp/base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/wctc4xxp/base.c	2017-05-09 20:40:14.041864392 +0200
@@ -26,6 +26,10 @@
 #include <linux/slab.h>
 #include <linux/kmod.h>
 #include <linux/sched.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
diff -ur dahdi-linux-2.11.1/drivers/dahdi/wctdm24xxp/base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/wctdm24xxp/base.c
--- dahdi-linux-2.11.1/drivers/dahdi/wctdm24xxp/base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/wctdm24xxp/base.c	2017-05-09 20:39:47.343067209 +0200
@@ -44,6 +44,9 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/sched.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
diff -ur dahdi-linux-2.11.1/drivers/dahdi/wcte12xp/base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/wcte12xp/base.c
--- dahdi-linux-2.11.1/drivers/dahdi/wcte12xp/base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/wcte12xp/base.c	2017-05-09 20:40:31.216160114 +0200
@@ -40,6 +40,10 @@
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/slab.h>
 
 #include <stdbool.h>
diff -ur dahdi-linux-2.11.1/drivers/dahdi/wcte43x-base.c dahdi-linux-2.11.1-4.11/drivers/dahdi/wcte43x-base.c
--- dahdi-linux-2.11.1/drivers/dahdi/wcte43x-base.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/wcte43x-base.c	2017-05-09 20:38:38.996830549 +0200
@@ -33,6 +33,10 @@
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)
+#include <linux/sched/signal.h>
+#endif
 #include <linux/crc32.h>
 #include <linux/slab.h>
 
diff -ur dahdi-linux-2.11.1/drivers/dahdi/xpp/xbus-core.c dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xbus-core.c
--- dahdi-linux-2.11.1/drivers/dahdi/xpp/xbus-core.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xbus-core.c	2017-05-09 20:41:27.973007253 +0200
@@ -244,7 +244,11 @@
 {
 	struct kref *kref = &xbus->kref;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,11,0)
 	return atomic_read(&kref->refcount);
+#else
+	return kref_read(kref);
+#endif
 }
 
 /*------------------------- Frame  Handling ------------------------*/
diff -ur dahdi-linux-2.11.1/drivers/dahdi/xpp/xbus-sysfs.c dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xbus-sysfs.c
--- dahdi-linux-2.11.1/drivers/dahdi/xpp/xbus-sysfs.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xbus-sysfs.c	2017-05-09 20:42:09.972886067 +0200
@@ -974,7 +974,11 @@
 		return;
 	}
 	XBUS_DBG(DEVICES, xbus, "going to unregister: refcount=%d\n",
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,11,0)
 		atomic_read(&astribank->kobj.kref.refcount));
+#else
+		kref_read(&astribank->kobj.kref));
+#endif
 	BUG_ON(dev_get_drvdata(astribank) != xbus);
 	device_unregister(astribank);
 	dev_set_drvdata(astribank, NULL);
diff -ur dahdi-linux-2.11.1/drivers/dahdi/xpp/xpp_dahdi.c dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xpp_dahdi.c
--- dahdi-linux-2.11.1/drivers/dahdi/xpp/xpp_dahdi.c	2016-03-01 23:03:59.000000000 +0100
+++ dahdi-linux-2.11.1-4.11/drivers/dahdi/xpp/xpp_dahdi.c	2017-05-09 20:42:55.336485638 +0200
@@ -124,7 +124,11 @@
 {
 	struct kref *kref = &xpd->kref;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,11,0)
 	return atomic_read(&kref->refcount);
+#else
+	return kref_read(kref);
+#endif
 }
 
 xpd_t *get_xpd(const char *msg, xpd_t *xpd)