There is already a macro named DEFAULT_PRIO in prio.h, we can use it
to define NICE_TO_PRIO and PRIO_TO_NICE rather than use hard coding
of (MAX_RT_PRIO + 20).

Signed-off-by: Dongsheng Yang <yangds.f...@cn.fujitsu.com>
cc: Peter Zijlstra <pet...@infradead.org>
cc: Ingo Molnar <mi...@kernel.org>
---
 include/linux/sched/prio.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index 410ccb7..1ceaaa1 100644
--- a/include/linux/sched/prio.h
+++ b/include/linux/sched/prio.h
@@ -25,8 +25,8 @@
  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
  * and back.
  */
-#define NICE_TO_PRIO(nice)     (MAX_RT_PRIO + (nice) + 20)
-#define PRIO_TO_NICE(prio)     ((prio) - MAX_RT_PRIO - 20)
+#define NICE_TO_PRIO(nice)     ((nice) + DEFAULT_PRIO)
+#define PRIO_TO_NICE(prio)     ((prio) - DEFAULT_PRIO)
 
 /*
  * 'User priority' is the nice value converted to something we
-- 
1.8.2.1

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