[PATCH 1/2] sched/prio: Add two inline function named nice_to_rlimit() and rlimit_to_nice() in prio.h.

[Dongsheng Yang]

This patch add two inline functions named nice_to_rlimit() and rlimit_to_nice() in prio.h.
They are handle the convertion between nice value [19,-20] and rlimit style value [1,40].

Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
---
 include/linux/sched/prio.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index ac32258..d9cf5a5 100644
--- a/include/linux/sched/prio.h
+++ b/include/linux/sched/prio.h
@@ -41,4 +41,20 @@
 #define TASK_USER_PRIO(p)	USER_PRIO((p)->static_prio)
 #define MAX_USER_PRIO		(USER_PRIO(MAX_PRIO))
 
+/*
+ * Convert nice value [19,-20] to rlimit style value [1,40].
+ */
+static inline long nice_to_rlimit(long nice)
+{
+	return (MAX_NICE - nice + 1);
+}
+
+/*
+ * Convert rlimit style value [1,40] to nice value [-20, 19].
+ */
+static inline long rlimit_to_nice(long prio)
+{
+	return (MAX_NICE - prio + 1);
+}
+
 #endif /* _SCHED_PRIO_H */
-- 
1.8.2.1

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