linux-kernel - [PATCH] [RT] preempt_disable_rt for CONFIG_PREEMPT

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Date:	Thu, 11 Dec 2008 20:05:48 +0100
From:	Tim Blechmann <tim@...ngt.org>
To:	rostedt@...dmis.org
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	mingo@...e.hu, tglx@...utronix.de, Tim Blechmann <tim@...ngt.org>
Subject: [PATCH] [RT] preempt_disable_rt for CONFIG_PREEMPT_RT

in some cases, spinlocks are used to avoid preemption. does not work
correctly, when CONFIG_PREEMPT_RT is enabled.

therefore two new macros are introduced:
preempt_disable_rt/preempt_disable_rt behave like their equivalents, if
CONFIG_PREEMPT_RT is enabled, and as noops otherwise.

Signed-off-by: Tim Blechmann <tim@...ngt.org>
---
 include/linux/preempt.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 72b1a10..2526170 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -93,6 +93,16 @@ do { \
 
 #endif
 
+#ifdef CONFIG_PREEMPT_RT
+#define preempt_disable_rt	preempt_disable
+#define preempt_enable_rt	preempt_enable
+#else
+#define
+#define preempt_disable_rt	do { } while (0)
+#define preempt_enable_rt	do { } while (0)
+#endif
+
+
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
 struct preempt_notifier;
-- 
1.5.6.3

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