From c5491ea779793f977d282754db478157cc409d82 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 21 Mar 2011 12:09:35 +0100
Subject: sched/rt: Add schedule_preempt_disabled()
Add helper to get rid of the ever repeating:
preempt_enable_no_resched();
schedule();
preempt_disable();
patterns.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-wxx7btox7coby6ifv5vzhzgp@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/sched/core.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
(limited to 'kernel/sched')
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 91fe6a0..7302239 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3246,6 +3246,18 @@ asmlinkage void __sched schedule(void)
}
EXPORT_SYMBOL(schedule);
+/**
+ * schedule_preempt_disabled - called with preemption disabled
+ *
+ * Returns with preemption disabled. Note: preempt_count must be 1
+ */
+void __sched schedule_preempt_disabled(void)
+{
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+}
+
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
static inline bool owner_running(struct mutex *lock, struct task_struct *owner)
--
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