Index: head/sys/compat/linuxkpi/common/include/linux/preempt.h
===================================================================
--- head/sys/compat/linuxkpi/common/include/linux/preempt.h	(revision 347890)
+++ head/sys/compat/linuxkpi/common/include/linux/preempt.h	(revision 347891)
@@ -1,40 +1,42 @@
 /*-
  * Copyright (c) 2017 Mellanox Technologies, Ltd.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice unmodified, this list of conditions, and the following
  *    disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #ifndef _LINUX_PREEMPT_H_
 #define	_LINUX_PREEMPT_H_
 
 #include <linux/list.h>
 
 #define	in_interrupt() \
 	(curthread->td_intr_nesting_level || curthread->td_critnest)
 
+#define	in_task() (curthread->td_priority >= PI_SOFT)
+
 #define	preempt_disable()	critical_enter()
 #define	preempt_enable()	critical_exit()
 
 #endif					/* _LINUX_PREEMPT_H_ */