[PATCH 3/3] rtmutex: remove unnecessary adjust prio

From: Alex Shi <alex.shi@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org (open list:LOCKING PRIMITIVES)
Cc: Alex Shi <alex.shi@linaro.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Sebastian Siewior <bigeasy@linutronix.de>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Juri Lelli <juri.lelli@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 3/3] rtmutex: remove unnecessary adjust prio
Date: Thu, 25 May 2017 13:26:34 +0800	[thread overview]
Message-ID: <1495689995-29849-3-git-send-email-alex.shi@linaro.org> (raw)
In-Reply-To: <1495689995-29849-1-git-send-email-alex.shi@linaro.org>

We don't need to adjust prio before new pi_waiter adding. The prio
only need update after pi_waiter change or task priority change.

Signed-off-by: Alex Shi <alex.shi@linaro.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
To: linux-kernel@vger.kernel.org
To: Ingo Molnar <mingo@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
---
 kernel/locking/rtmutex.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index b955094..b659ba0 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -963,7 +963,6 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 		return -EDEADLK;
 
 	raw_spin_lock(&task->pi_lock);
-	rt_mutex_adjust_prio(task);
 	waiter->task = task;
 	waiter->lock = lock;
 	waiter->prio = task->prio;
-- 
1.9.1
