From: Shawn Bohrer <sbohrer@rgmadvisors.com>
Date: Fri, 4 Oct 2013 19:24:53 +0000 (-0500)
Subject: sched/rt: Remove redundant nr_cpus_allowed test
X-Git-Tag: next-20131017~32^2~14^2~66
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6bfa687c19b7ab8adee03f0d43c197c2945dd869;p=karo-tx-linux.git

sched/rt: Remove redundant nr_cpus_allowed test

In 76854c7e8f3f4172fef091e78d88b3b751463ac6 ("sched: Use
rt.nr_cpus_allowed to recover select_task_rq() cycles") an
optimization was added to select_task_rq_rt() that immediately
returns when p->nr_cpus_allowed == 1 at the beginning of the
function.

This makes the latter p->nr_cpus_allowed > 1 check redundant,
which can now be removed.

Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Mike Galbraith <mgalbraith@suse.de>
Cc: tomk@rgmadvisors.com
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1380914693-24634-1-git-send-email-shawn.bohrer@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 01970c8e64df..ceebfba0a1dd 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1213,8 +1213,7 @@ select_task_rq_rt(struct task_struct *p, int sd_flag, int flags)
 	 */
 	if (curr && unlikely(rt_task(curr)) &&
 	    (curr->nr_cpus_allowed < 2 ||
-	     curr->prio <= p->prio) &&
-	    (p->nr_cpus_allowed > 1)) {
+	     curr->prio <= p->prio)) {
 		int target = find_lowest_rq(p);
 
 		if (target != -1)