Commit-ID: c5491ea779793f977d282754db478157cc409d82
Gitweb: http://git.kernel.org/tip/c5491ea779793f977d282754db478157cc409d82
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Mon, 21 Mar 2011 12:09:35 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 1 Mar 2012 10:28:03 +0100
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@xxxxxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-wxx7btox7coby6ifv5vzhzgp@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/sched.h | 1 +
kernel/sched/core.c | 12 ++++++++++++
2 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1a63984..03dd224 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -361,6 +361,7 @@ extern signed long schedule_timeout_interruptible(signed long timeout);
extern signed long schedule_timeout_killable(signed long timeout);
extern signed long schedule_timeout_uninterruptible(signed long timeout);
asmlinkage void schedule(void);
+extern void schedule_preempt_disabled(void);
extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
struct nsproxy;
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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