[tip:sched/core] sched: prio: Add 3 macros of MAX_NICE, MIN_NICE and NICE_WIDTH in prio.h.

[tip-bot for Dongsheng Yang]

Commit-ID:  798fa741dd4e5a2d15e862367000a0ac63253978
Gitweb:     http://git.kernel.org/tip/798fa741dd4e5a2d15e862367000a0ac63253978
Author:     Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
AuthorDate: Tue, 11 Feb 2014 15:34:46 +0800
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 21 Feb 2014 21:43:20 +0100

sched: prio: Add 3 macros of MAX_NICE, MIN_NICE and NICE_WIDTH in prio.h.

Currently, there are lots of hard coding of 19 and -20 to represent
maximum and minimum of nice value.

This patch add three macros in prio.h for maximum, minimum and width
of nice value.

cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/3994e89327b2b15f992277cdf9f409c516f87d1b.1392103744.git.yangds.fnst@xxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 include/linux/sched/prio.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index 1ceaaa1..c6974c4 100644
--- a/include/linux/sched/prio.h
+++ b/include/linux/sched/prio.h
@@ -1,6 +1,10 @@
 #ifndef _SCHED_PRIO_H
 #define _SCHED_PRIO_H
 
+#define MAX_NICE	19
+#define MIN_NICE	-20
+#define NICE_WIDTH	(MAX_NICE - MIN_NICE + 1)
+
 /*
  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
--
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