linux-kernel - [PATCH 1/3] sched: fix the task-group check in tg_has_rt

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Message-ID: <20140921193336.GA28618@redhat.com>
Date:	Sun, 21 Sep 2014 21:33:36 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Kirill Tkhai <tkhai@...dex.ru>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] 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@...hat.com>
---
 kernel/sched/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index eee12b3..9023f56 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7354,7 +7354,7 @@ 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;
 	}
 
-- 
1.5.5.1

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