[PATCH] introduce is_rt_policy() helper

Imho, makes the code a bit easier to read.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/sched.h

@@ -504,8 +504,8 @@ struct signal_struct {
 #define rt_prio(prio)		unlikely((prio) < MAX_RT_PRIO)
 #define rt_task(p)		rt_prio((p)->prio)
 #define batch_task(p)		(unlikely((p)->policy == SCHED_BATCH))
-#define has_rt_policy(p) \
-	unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH)
+#define is_rt_policy(p)		((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
+#define has_rt_policy(p)	unlikely(is_rt_policy((p)->policy))
 
 /*
  * Some day this will be a full-fledged user tracking system..

kernel/sched.c

@@ -4109,8 +4109,7 @@ int sched_setscheduler(struct task_struct *p, int policy,
 	    (p->mm && param->sched_priority > MAX_USER_RT_PRIO-1) ||
 	    (!p->mm && param->sched_priority > MAX_RT_PRIO-1))
 		return -EINVAL;
-	if ((policy == SCHED_NORMAL || policy == SCHED_BATCH)
-					!= (param->sched_priority == 0))
+	if (is_rt_policy(policy) != (param->sched_priority != 0))
 		return -EINVAL;
 
 	/*
@@ -4134,7 +4133,7 @@ int sched_setscheduler(struct task_struct *p, int policy,
 				!rlim_rtprio)
 			return -EPERM;
 		/* can't increase priority */
-		if ((policy != SCHED_NORMAL && policy != SCHED_BATCH) &&
+		if (is_rt_policy(policy) &&
 		    param->sched_priority > p->rt_priority &&
 		    param->sched_priority > rlim_rtprio)
 			return -EPERM;