[Devel] [PATCH RHEL7 COMMIT] linux/preempt_mask.h: Add in_task() macro.

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-862.11.6.vz7.71.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-862.11.6.vz7.71.6
------>
commit 032ebd08d12e117e3904ad583d8f941b9fffb94d
Author: Andrey Ryabinin <aryabinin at virtuozzo.com>
Date:   Fri Aug 31 13:29:53 2018 +0300

    linux/preempt_mask.h: Add in_task() macro.
    
    in_task() returns true if we are executing in the task context.
    Implementation has been stolen from upstream.
    
    https://jira.sw.ru/browse/PSBM-87797
    Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
    
    Reviewed-by: Denis V. Lunev <den at openvz.org>
---
 include/linux/preempt_mask.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/preempt_mask.h b/include/linux/preempt_mask.h
index a492ae8e6f10..5eb3970311dc 100644
--- a/include/linux/preempt_mask.h
+++ b/include/linux/preempt_mask.h
@@ -88,6 +88,8 @@
 #define in_softirq()		(softirq_count())
 #define in_interrupt()		(irq_count())
 #define in_serving_softirq()	(softirq_count() & SOFTIRQ_OFFSET)
+#define in_task()		(!(preempt_count() & \
+				   (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET)))
 
 /*
  * Are we in NMI context?