linux-kernel - [PATCH [RT] 01/14] spinlocks: fix preemption feature when PREEMPT

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Message-ID: <20080221152630.4804.56954.stgit@novell1.haskins.net>
Date:	Thu, 21 Feb 2008 10:26:30 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	rostedt@...dmis.org, linux-rt-users@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, bill.huey@...il.com,
	kevin@...man.org, cminyard@...sta.com, dsingleton@...sta.com,
	dwalker@...sta.com, npiggin@...e.de, dsaxena@...xity.net,
	ak@...e.de, gregkh@...e.de, sdietrich@...ell.com,
	pmorreale@...ell.com, mkohari@...ell.com, ghaskins@...ell.com
Subject: [PATCH [RT] 01/14] spinlocks: fix preemption feature when PREEMPT_RT
	is enabled

The logic is currently broken so that PREEMPT_RT disables preemptible
spinlock waiters, which is counter intuitive. 

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

 kernel/spinlock.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index c9bcf1b..b0e7f02 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -117,7 +117,7 @@ EXPORT_SYMBOL(__write_trylock_irqsave);
  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
  */
 #if !defined(CONFIG_PREEMPT) || !defined(CONFIG_SMP) || \
-	defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_PREEMPT_RT)
+	defined(CONFIG_DEBUG_LOCK_ALLOC)
 
 void __lockfunc __read_lock(raw_rwlock_t *lock)
 {

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