From: Oleg Nesterov <oleg@redhat.com>
Date: Sun, 21 Sep 2014 19:33:36 +0000 (+0200)
Subject: sched: Fix the task-group check in tg_has_rt_tasks()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8651c65844e93af44554272b7e0d2b142837b244;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

sched: Fix the task-group check in tg_has_rt_tasks()

tg_has_rt_tasks() wants to find an RT task in this task_group, but
task_rq(p)->rt.tg wrongly checks the root rt_rq.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Link: http://lkml.kernel.org/r/20140921193336.GA28618@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 09bde2ab2a0a..0abfb7ec9e62 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7441,7 +7441,7 @@ static inline int tg_has_rt_tasks(struct task_group *tg)
 	struct task_struct *g, *p;
 
 	for_each_process_thread(g, p) {
-		if (rt_task(p) && task_rq(p)->rt.tg == tg)
+		if (rt_task(p) && task_group(p) == tg)
 			return 1;
 	}