linux-kernel - [PATCH RT RFC 3/7] rtmutex: formally initialize the rt_mutex

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Date:	Fri, 01 Aug 2008 15:17:02 -0600
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
	tglx@...utronix.de, rosted@...dmis.org
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	gregory.haskins@...il.com
Subject: [PATCH RT RFC 3/7] rtmutex: formally initialize the rt_mutex_waiters

We will be adding more logic to rt_mutex_waiters and therefore lets
centralize the initialization to make this easier going forward.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/rtmutex.c |   26 ++++++++++++++------------
 1 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 7d11380..12de859 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -805,6 +805,15 @@ static int adaptive_wait(struct rt_mutex_waiter *waiter,
 }
 #endif
 
+static void init_waiter(struct rt_mutex_waiter *waiter)
+{
+	memset(waiter, 0, sizeof(*waiter));
+
+	debug_rt_mutex_init_waiter(waiter);
+	waiter->task = NULL;
+	waiter->write_lock = 0;
+}
+
 /*
  * Slow path lock function spin_lock style: this variant is very
  * careful not to miss any non-lock wakeups.
@@ -823,9 +832,7 @@ rt_spin_lock_slowlock(struct rt_mutex *lock)
 	struct task_struct *orig_owner;
 	int missed = 0;
 
-	debug_rt_mutex_init_waiter(&waiter);
-	waiter.task = NULL;
-	waiter.write_lock = 0;
+	init_waiter(&waiter);
 
 	spin_lock_irqsave(&lock->wait_lock, flags);
 	init_lists(lock);
@@ -1324,6 +1331,8 @@ rt_read_slowlock(struct rw_mutex *rwm, int mtx)
 	int saved_lock_depth = -1;
 	unsigned long saved_state = -1, state, flags;
 
+	init_waiter(&waiter);
+
 	spin_lock_irqsave(&mutex->wait_lock, flags);
 	init_rw_lists(rwm);
 
@@ -1335,10 +1344,6 @@ rt_read_slowlock(struct rw_mutex *rwm, int mtx)
 
 	/* Owner is a writer (or a blocked writer). Block on the lock */
 
-	debug_rt_mutex_init_waiter(&waiter);
-	waiter.task = NULL;
-	waiter.write_lock = 0;
-
 	if (mtx) {
 		/*
 		 * We drop the BKL here before we go into the wait loop to avoid a
@@ -1538,8 +1543,7 @@ rt_write_slowlock(struct rw_mutex *rwm, int mtx)
 	int saved_lock_depth = -1;
 	unsigned long flags, saved_state = -1, state;
 
-	debug_rt_mutex_init_waiter(&waiter);
-	waiter.task = NULL;
+	init_waiter(&waiter);
 
 	/* we do PI different for writers that are blocked */
 	waiter.write_lock = 1;
@@ -2270,9 +2274,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 	struct rt_mutex_waiter waiter;
 	unsigned long flags;
 
-	debug_rt_mutex_init_waiter(&waiter);
-	waiter.task = NULL;
-	waiter.write_lock = 0;
+	init_waiter(&waiter);
 
 	spin_lock_irqsave(&lock->wait_lock, flags);
 	init_lists(lock);

--
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